Vacuum Furnace in Experiment

Vacuum furnace is generally composed of furnace, electrothermal device, vacuum system, sealed shell, power supply system and temperature control system. Sealing furnace shell is welded with carbon steel or stainless steel, and the joint surface of removable parts is sealed with vacuum sealing material. In order to prevent the shell from deforming and sealing material from deteriorating after heating, the shell is usually cooled by water or gas.

The matters needing attention in the experiment of vacuum furnace, such as the structure of vacuum furnace, temperature control, heating technology and atmosphere in the furnace, will directly affect the quality of the product after the production of vacuum furnace. In forging furnace, increasing the temperature of metal can reduce the melting resistance, but too high temperature can cause grain oxidation or over-burning, which greatly affects the quality of products in vacuum furnace. In the process of heat treatment, if the steel is heated to a point above the critical temperature and then suddenly cooled, the hardness and strength of the steel can be improved; if the steel is heated to a point below the critical temperature and then cooled slowly, the steel will be more tough.

Vacuum oven, as its name implies, is high vacuum, because its structure is circular, it can extract high vacuum. Why do we need an atmosphere furnace when we have a vacuum furnace? This is in terms of price. Assuming that the vacuum of customer's demand is not high, the atmosphere furnace can meet his requirements, you say how he chooses. In addition, the atmosphere furnace generally intake and exhaust at the same time, through the maintenance of gas, can also prevent the atmosphere into the furnace, can fully meet the requirements of product processing.

Vacuum sintering in vacuum furnace means that powder, powder compact or other materials are heated at appropriate temperature in vacuum environment, and the bonding between particles is realized by means of atomic migration. The purpose of sintering is to make the porous powder compacts possess certain structure and properties of alloys. Selection of heat shield: The heat shield is the main part of the heating chamber of vacuum sintering furnace. Its main function is heat insulation, heat preservation and reducing heat loss. It is also the structural basis of fixed heater. Therefore, the structure and material selection of the heat shield have a great influence on the power and performance of the vacuum furnace (such as vacuum degree, exhaust rate, etc.)

Vacuum-Furnace-Production-Technology

Double-chamber-Vacuum-Oil-Quenching-Gas-Cooling-Furnace-Operation

Vacuum-Furnace-Temperature-Control

Vacuum-Furnace-Automatic-Control-System

Horizontal Vacuum Furnace Application

The main use of horizontal vacuum furnace is high vacuum limit. The vacuum of furnace body can be lost in cold state, which is better than 5 *10-4 pa, and can be kept in 10-3 PA number in hot state. Full-station dynamic simulation performance, operation control, intuitive and clear.

Horizontal vacuum furnace is a heat treatment equipment which combines vacuum technology with electric furnace heating technology. It is used in metallurgy, machinery, aerospace, electronics, light industry and other industrial sectors. Such as: semiconductor chip sintering and annealing treatment, permanent magnet alloy manufacturing, vacuum brazing, vacuum degassing, non-oxidation bright heat treatment of metal materials and other processes. Because the equipment can be supplied to clean and impurity-free high vacuum state, the heating temperature is average and can be accurately controlled, the process conditions are excellent, and the quality and yield of the workpiece can be improved.

Horizontal vacuum furnace technology:

A number of thermocouples are set up in the working hot area, and the temperature distribution in the real hot area is recorded by means of function recorder, temperature controller and computer performance.

Imported temperature controller with high precision and multi-function can automatically adjust and modify PID parameters. It can store 9 temperature control curves and can be modified online.

It can be monitored by two-way communication, and the relevant content can be represented by menus, charts, curves, dynamic interfaces, etc.

Electric-Vacuum-Crucible-Furnace-Muffle-furnace-with-factory-price

Three-temperature-zones-hydrogen-vacuum-tube-furnace-lab-furnace


Vacuum-Furnace-of-Five-Advantages

Vacuum Gas Quenching Furnace

Vacuum gas quenching furnace uses graphite heater and hard graphite felt as heat insulation screen. The vacuum gas quenching furnace consists of the main body of the vacuum furnace, the vacuum system, the water cooling system, the charging system, the starting system and the relay control system. The vacuum gas quenching furnace is a visual operation interface, easy to operate, simple, manual automatic and free switching, and can realize full automatic control. Vacuum gas quenching furnace has perfect sound and light alarm system, mechanical and electrical double interlocking design to ensure safe and reliable operation of equipment.

Vacuum gas quenching furnace is mainly suitable for vacuum bright quenching of die steel, vacuum sintering and vacuum brazing of other materials such as powder metallurgy and copper alloy.

Industrial-SiC-vacuum-sintering-furnace

vaccum-melting-furnace-Brazing-Annealing-for-vacuum-furnace

Gas-quenching-furnace-carburizing-furnace

vacuum degreasing sintering furnace heating chamber

The choice of vacuum degreasing sintering furnace should be based on its use and the performance of its components. Today, the vacuum furnace manufacturer introduces the selection of heating chamber for vacuum degreasing sintering furnace.

Selection basis of heating chamber of vacuum degreasing sintering furnace:

1. Graphite reflecting screen: Hard felt and soft felt are usually used in vacuum furnace. They are suitable for quenching, tempering and annealing of common steel. High temperature brazing, powder metallurgy and sintering, etc. Vacuum furnace manufacturer.

2. Metal heat shield; stainless steel and molybdenum are usually used in vacuum furnaces. Molybdenum reflector screen is suitable for high temperature and high demand for furnace environment, such as: superalloy, titanium alloy, magnetic data, quenching, annealing, high temperature brazing, sintering, etc. Stainless steel rice shooting screen is suitable for tempering, low temperature annealing, aging, vacuum aluminium brazing, and some low temperature furnace type selection. Vacuum furnace manufacturer.

hot-selling-medium-frequency-induction-melting-furnace-for-copper

Aluminium-alloy-material-annealing-furnace

Good-quailty-high-temperature-vacuum-brazing-furnace

Plain-aluminum-brazing-usage-atmosphere-vacuum-furnace

Vacuum Tube Furnace Working Principle

How does the vacuum tubular furnace work in reducing atmosphere?

In order to work in reducing atmosphere, how to use mixed reducing gas considering safety and cost? Here are three problems we may encounter.

1. A mixture of hydrogen and argon, or a mixture of hydrogen and nitrogen? What's the proportion?

Answer: High-purity nitrogen is cheaper than high-purity argon. If nitrogen does not affect the reaction, it is also economical to use nitrogen. The concentration of hydrogen is as low as possible and the surface area of solid is as large as possible. High temperature vacuum furnace.

2. Buy two bottles of pure gas separately and mix them again, or a bottle of mixed gas from a manufacturer?

Answer: It's better to mix by oneself, and the proportion requirement is not very precise. It's OK to use float flowmeter, and the proportion can be changed at any time. Manufacturers are allocated according to measurement standards, the price is relatively expensive. Of course, you need to pay more for a cylinder. High temperature vacuum furnace.

3. In addition to vacuum tubular furnace and gas, do you need any special accessories when using this reducing gas?

Answer: Other special accessories are not needed. Just remember to drain the exhaust gas outdoors.

aluminum-alloy-vertical-vacuum-high-pressure-quenching-furnace

Industrial-Car-Bottom-Tempering-Furnace

high-temperature-mini-electric-induction-type-heat-treatment-vacuum-lab-furnace

Vacuum Sintering Furnace of Classification

Vacuum sintering furnace is mainly used for sintering metal powder products, metal injection forming products, cemented carbide, ceramics, Nd-Fe-B, stainless steel non-woven fabrics, etc. The structure of the high temperature vacuum sintering furnace is basically the same as that of the vacuum heat treatment furnace, except that appropriate changes are made according to the sintering process.

Vacuum sintering furnaces are divided into double vacuum sintering furnaces and single outdoor circulating pressurized gas-cooled vacuum sintering furnaces.

Dual vacuum sintering furnace has two identical sintering furnaces, which share a set of vacuum pumping system and electrical control system. In operation, the two furnaces are used for heating and cooling respectively, and they are used alternately. The furnace has the functions of degreasing, pre-sintering and sintering in the same furnace at one time. The degreasing system includes external pipelines, vacuum valves, condensers, collectors and mechanical pumps.

In order to meet the requirements of Nd-Fe-B sintering process, a vacuum unit with high vacuum and large pumping speed should be equipped in a single outdoor circulating pressurized gas-cooled sintering furnace. The structure of the furnace is the same as that of a single-chamber outdoor circulating pressurized gas quenching vacuum furnace.

60KW-compact-vacuum-sintering-furnace

Vacuum-Arc-Melting-furnace-used-for-smelting-metal-alloys

Aluminum-Alloy-Vacuum-Heat-Treatment-Furnace

Vacuum System Control of Vacuum Furnace

Conventional control of vacuum system of three-stage pump of vacuum furnace, the main control circuits of mechanical pump, Roots pump and diffusion pump are equipped with imported air switch to protect the circuit, and the imported AC contactor is used as control output.

Vacuum measurement adopts domestic high-quality digital vacuum gauge, which has strong anti-interference ability and fast reaction speed. A high-vacuum gauge and a low-vacuum gauge measure the high and low vacuum degree in the vacuum chamber respectively, and send the measured value to the vacuum gauge to display, and output the set signal to the PLC to control the vacuum system. The pneumatic valve of the vacuum system is controlled by a high-quality solenoid valve through a pneumatic source. The electric signal has the output of plc, which can be manually and automatically controlled. According to the process and the vacuum gauge signal, the interlock can be realized.

Vacuum-Sintering-Furnace-Improvement-of-the-Structure

Vacuum-Furnace-reasons-for-Quenching-Deformation

Vacuum-Carburizing-Furnace-Cautions-for-Use

Vacuum Hot Press Furnace

Vacuum hot pressing furnace and vacuum pressure furnace are two different types of furnace. The heating mode of the two types of furnace is basically the same. The difference is that there is a hot pressing punch in the vacuum hot pressing furnace. When used, the material is placed in the high temperature die chamber. The material in the die chamber is sintered under pressure after contacting with the material in the die chamber by means of hydraulic or electric pressure. The whole pressurized die is placed in the heating area. At the heart, the chamber is kept in a vacuum or atmospheric state, where the chamber atmosphere can only reach a slightly positive pressure (< 20KPa). However, the whole chamber of vacuum pressure furnace is made of special materials and can bear high pressure vessel as furnace body. With this furnace sintering, the furnace can be filled with high pressure sintering (9.8MPa). According to the designed chamber pressure, the material can be treated at high temperature and pressure. Vacuum hot pressing sintering furnace is a mechanical contact pressure sintering (used for powder metallurgy and ceramic material hot pressing sintering), vacuum pressure sintering furnace is the whole furnace chamber to achieve a high pressure state for sintering (used for LED phosphor sintering).

carburization-vacuum-mesh-belt-heat-treat-furnace

hot-selling-melting-electric-vacuum-induction-furnace

vacuum-brazing-furnace-products-reasons-for-oxidation

Vacuum Furnace for Sintering Transparent Ceramics

When choosing vacuum furnace for sintering alumina ceramics, we should consider the following points. According to the above points, we should choose the vacuum furnace we need.

The sintering temperature of alumina transparent ceramics and transparent ceramics is 1800 - 1850 C. We choose the vacuum furnace type in this temperature range.

(2) The requirement of vacuum degree, we will recommend the user to choose the high vacuum type furnace, which can extract the high temperature gas from the furnace chamber, equip the diffusion pump, or molecular pump furnace type.

(3) Whether heating elements and insulation materials will pollute alumina transparent ceramics, the third point is the most important, that is, to select the appropriate heating elements. We have tungsten wires and graphite for the conventional heating elements at 1850 C. Here we choose the vacuum furnace heated by tungsten material, because at high temperature, the furnace heated by graphite will release carbon atmosphere, which will pollute our transparent alumina. In the past, some factories used graphite-heated vacuum furnaces to burn transparent alumina transparently by burying, but this method only carried out test sintering in the absence of tungsten type furnaces. It is not recommended that users purchase this type of vacuum furnaces.

(4) Whether hydrogen-filled sintering is needed or not, if hydrogen-filled sintering, the cyclic ignition function must be configured, the safety protection must be in place, and the explosion-proof system should be well done.

Industrial-Electric-Vacuum-Heat-Treatment-Furnace-With-Low-Price

Cheapest-industrial-heat-treatment-equipment

Horizontal-Single-chamber-Vacuum-Carburising-Furnace

Vacuum sintering furnace in powder metallurgy

In view of the time-varying, large lag and non-linear characteristics of vacuum sintering furnace of powder metallurgy, the PID control effect is not ideal, and the fuzzy control algorithm is selected. The simulation models of PID control and fuzzy control are established and compared. The results show that the response speed of the system is very fast, the steady-state time is only 3.2s, there is no overshoot, the steady-state error is 1.2 C, and the steady-state accuracy is very high. The output of the system simulation is close to the given input waveform, the system regulation time is short, the system quickly enters the stable state, and the oscillation is very small. 。 Fuzzy control is superior to traditional PID control and can meet the temperature control requirements of vacuum sintering furnace of powder metallurgy.vacuum-heat-treatment-for-ring-dies

Powder metallurgy vacuum sintering furnace is a time-varying, large lag, non-linear heating system. Because of the complexity of its physical and chemical mechanism, there are many influencing factors, it is difficult to obtain accurate mathematical model. When the parameters change greatly and the control precision is required high, the general PID control effect is very unsatisfactory. Fuzzy control does not require the system to give an accurate mathematical model. According to the actual experience of human beings, control rules are formulated and control decision tables are made. The system is controlled according to the decision tables. It is especially suitable for sintering furnace, which is a complex industrial production object.vacuum-furnace-maintenance

The main factors affecting the quality of products in sintering process are sintering temperature and sintering time. Especially the requirement of temperature is very strict. The temperature difference is generally not allowed to exceed the given value of ~3 ~5 C, so it must be strictly controlled.vacuum-furnace-touch-screen-plc

Multi-chamber Continuous Vacuum Furnace

At present, most of the vacuum furnaces used in various industries in our country are single chamber or double chamber, which has obvious shortcomings, such as high cost, high energy consumption, low efficiency and so on. In order to overcome the above shortcomings and meet the needs of modern industry, our company independently developed a new type of multi-chamber continuous vacuum furnace. The equipment has excellent performance, ideal operation and simple operation.

A general survey of multi-chamber continuous vacuum furnace is composed of feeding chamber, preheating chamber, high temperature studio, cooling chamber, discharging chamber, intermediate gate valve, vacuum system, workpiece transfer system, water cooling system and electronic control system. Unique building block design allows users to easily build different production lines, such as five rooms, eight rooms and so on.vacuum-heat-treatment-solutions

The new type of vacuum furnace is the further application and extension of induction melting technology. The vacuum furnace body adopts square box structure, which is practical and beautiful, and can effectively reduce the butt transfer between the charging car outside the furnace and the roller axle inside the furnace.vacuum-heat-treating-services

Vacuum system of vacuum furnace adopts digital display compound vacuum gauge, high vacuum is measured by ionization gauge and low vacuum is measured by resistance gauge. The heating system composed of preheating room and high temperature studio has the advantages of good heat preservation effect and energy saving. In addition, the vacuum furnace also has a new type of pneumatic gate valve, workpiece truck transfer system and automatic control system, temperature control intelligent and flexible. In short, the excellent performance of vacuum furnace has been recognized by the industry.vacuum-hot-press-furnace

Multi-chamber continuous vacuum furnace has the same powerful ability as induction melting technology. It can realize large-scale pipeline production in the fields of vacuum brazing, vacuum sintering and vacuum heat treatment of metal materials.vacuum-brazing-of-diamond-single-crystal

Melting metal vacuum furnace

The pressure in the furnace can be pumped into an industrial furnace below atmospheric pressure. The vacuum furnace is electrically heated, and the surface of the heated workpiece is not oxidized, does not decarburize, has small deformation, and has good mechanical properties. Melting the metal in a vacuum furnace is advantageous for removing impurities, and the product has less pinholes, small segregation, and good quality. Vacuum furnaces are suitable for the smelting and heating of high quality, high purity, refractory metals, such as smelting and magnetic materials for tungsten, molybdenum, niobium, tantalum, titanium, heat resistant alloy steel, electrical materials, high strength steel, stainless steel, tools Heat treatment of steel, die steel, etc.vacuum-furnace-application

    Vacuum furnaces appeared around the 1930s. In 1927, the United States made a vacuum annealing furnace for electrical materials. In 1953, vacuum consumable electric arc furnaces have been used industrially to smelt titanium sponge. Vacuum induction furnaces were widely used in the industry around the 1950s. In 1960, the United States developed an oil quenching vacuum furnace.vacuum-oil-quenching-furnace

The vacuum furnace generally consists of a furnace, an electric heating device, a sealed furnace shell, a vacuum system, a power supply system, and a temperature control system. The sealed furnace shell is welded with carbon steel or stainless steel, and the joint surface of the detachable member is sealed with a vacuum sealing material. In order to prevent deformation of the furnace shell after heating and deterioration of the sealing material, the furnace shell is generally cooled by water or air cooled. The furnace is located in a sealed furnace shell. Depending on the furnace application, different types of heating elements, such as resistors, induction coils, electrodes and electron guns, are installed inside the furnace. The vacuum furnace furnace for melting metal is equipped with crucibles, and some are equipped with automatic pouring devices and robots for loading and unloading. The vacuum system is mainly composed of a vacuum pump, a vacuum valve and a vacuum gauge.vacuum-gas-quenching-furnace-pellet-die-heat-treatment-process/

The vacuum furnace is divided into a vacuum resistance furnace, a vacuum induction furnace, a vacuum arc furnace, a vacuum consumable electric arc furnace, an electron beam furnace (also called an electron bombardment furnace), and a plasma furnace according to heating elements.vacuum-heat-treatment-furnace-principle

What is the structure of the vacuum furnace?

The vacuum furnace uses a vacuum system in a specific space of the furnace chamber (a vacuum pump, a vacuum measuring device, a vacuum valve and the like are carefully assembled, and some substances in the furnace chamber are discharged, so that the pressure in the furnace chamber is less than a standard atmospheric pressure, The space inside the furnace chamber is thus in a vacuum state, which is a vacuum furnace.Vacuum-Induction-Melting-Furnace-For-Metal-Material-Melting-Processing-in-Lab

The vacuum furnace generally consists of a main machine, a furnace, an electric heating device, a sealed furnace shell, a vacuum system, a power supply system, a temperature control system, and an outside transport vehicle. The sealed furnace shell is welded with carbon steel or stainless steel, and the joint surface of the detachable member is sealed with a vacuum sealing material. In order to prevent deformation of the furnace shell after heating and deterioration of the sealing material, the furnace shell is generally cooled by water or air cooled. brazing-furnace

The furnace is located in a sealed furnace shell. Depending on the furnace application, different types of heating elements, such as resistors, induction coils, electrodes and electron guns, are installed inside the furnace. The vacuum furnace furnace for melting metal is equipped with crucibles, and some are equipped with automatic pouring devices and robots for loading and unloading. The vacuum system is mainly composed of a vacuum pump, a vacuum valve and a vacuum gauge.Industrial-Vacuum-gas-Quenching-Furnace-with-capacity-1500KG

Low Temper Vacuum Tempering Furnace Technology

1) The cryogenic treatment box with continuous computer monitoring and automatic regulation of liquid nitrogen input and automatic temperature rise and fall is used.

2) The treatment process consists of three procedures: precisely compiled cooling and super-low temperature holding and rising along with temperature.

The reasons why cryogenic treatment can improve performance are analyzed as follows:vacuum-arc-furnace-for-Sintering

1) It transforms austenite with lower hardness into martensite with higher hardness, stability, wear resistance and heat resistance.

2) Carbide particles with higher hardness and finer grain size are widely distributed in the lattice of the treated materials by ultra-low temperature treatment.

3) A more uniform, smaller and denser microstructures can be produced in the metal grains.metal-box-type-electric-vacuum-muffle-furnace

4) Because of the addition of micro-carbide particles and finer lattices, the denser molecular structure is resulted, which greatly reduces the tiny voids in the material.

5) After ultra-low temperature treatment, the internal thermal stress and mechanical stress of the material are greatly reduced, which effectively reduces the possibility of tool and tool cracking and edge collapse. In addition, because the residual stress in the tool affects the ability of the cutting edge to absorb kinetic energy, the tool after ultra-low temperature treatment not only has high wear resistance, but also its own residual stress harm is greatly reduced than that of the untreated tool.

6) In the treated cemented carbides, new combinations of molecular structures are produced due to the reduction of electronic kinetic energy.25Kg-Vacuum-Induction-Furnace

Die Heat Treatment

Die heat treatment is to develop the potential of die materials and improve the performance of the die. The performance of the die must meet the requirements of high strength (including high temperature strength, cold and thermal fatigue resistance), high hardness (wear resistance) and high toughness, as well as good machinability, weldability and corrosion resistance.

Die heat treatment is divided into three parts: preparation heat treatment, final heat treatment and surface strengthening.

The new technology of thermo-mechanical heat treatment for residual heat of die forging is a new technology developed in recent years. The final forging temperature of most dies is about 850 C. After the final forging, it is not slow cooling, but rapid quenching, then high temperature tempering or spheroidizing annealing. This measure is not only to save energy, but also to improve the service life of the die.vacuum-brazing

The problems of non-uniform structure and dimension sensitivity exist in hot die. This is related to the cooling rate and cross section size of the die. Conventional high temperature heating, slow cooling and isothermal annealing processes are difficult to eliminate, but there are also some problems such as long annealing cycle, large oxidation burning loss and low die life. The rapid spheroidizing annealing process solves this problem effectively. Fast uniform annealing process is a short-term heating and cooling process at a heating temperature far higher than that of traditional annealing process to obtain less residual carbide, fine, high dislocation density and unstable structure, and then to be heated and cooled with furnace for the second time, i.e. short-term heating and homogenizing at the temperature of breaking through isothermal spheroidization and tempering, and then at the temperature of tempering and tempering. It is cooled to room temperature at a cooling rate greater than that of conventional annealing, thus rapid spheroidization is carried out.vacuum-heat-treatment-and-ordinary-heat-treatment

Die heat treatment is an important process to ensure the performance of the die. It has a direct impact on the manufacturing accuracy of the die, the strength of the plastic die, the working life of the die and the cost of the die.

For complex dies, whether the processing technology is correct or not often has a greater impact on the deformation of the dies. The comparison of heating processes for some dies shows that the heating speed is faster and larger deformation often occurs.vacuum-induction-melting-furnace

Vacuum Brazing Furnace Operation

1. Ensure the operation of water, electricity and gas before the start-up of the vacuum furnace. Voltage at 380V, no deviation of 10%. The air pressure is 0.6 Mpa and the water pressure reaches the lowest value (0.5 MPa). Only when the above requirements are met can the power be switched on and operated.

2. Before discharging, check the equipment heating room. It is necessary for the heating room to be clean. No sundries, dust, oil, water, etc. In view of the goods placed, the same dry cleaning, no water stains, oil stains, etc. before discharging the material to be cleaned.High-Temperature-Vacuum-Furnace-for-Powder-Metallurgy-Sintering

3. After loading, push the knob to the "door" position. Then, start the "mechanical pump" and "rough pump valve". For the vacuum unit and the furnace, turn on the power supply of the vacuum furnace together (in general, the power supply of the vacuum meter starts with the total power supply).

4. When the vacuum degree is higher than 1000Pa, the vacuum gauge monitoring point "J2" lights up. At this time, the Roots pump can be opened. If the condition is not reached, the Roots pump will not be opened and the button will not respond.

5. When the vacuum degree is higher than 7Pa, the vacuum gauge monitoring point "J1" lights up. At this time, open the "front valve" and "decentralized pump". Pre-heating of "Dispersion Pump"hot-sale-Small-lab-vacuum-muffle-furnace

6. When the preheating time of the "distributed pump" reaches 90 minutes (the counter on the touch screen can be investigated), close the "rough suction valve", turn over the "high valve" and pump high vacuum into the furnace.

7. When the furnace vacuum reaches the operating vacuum (the vacuum gauge monitoring point "J3" lights up, pay attention to the initial monitoring point set higher, can set or reach the required vacuum, open heating by itself), open heating, and actively start operation with the temperature control meter (heating curve needs to be prepared beforehand).Vacuum-Diamond-Brazing-Furnace-for-Direct-Sale-Factory

Vacuum Quenching Furnace Structural Characteristics

Among vacuum furnaces, vacuum quenching furnaces are the most widely used and representative typical equipment. They have complete and scientific quality management system, standardized production workshop, annual production capacity of 1000 electric furnaces, and the production scale is in the forefront of the industry. They are influential manufacturers of experimental electric furnaces and industrial furnaces in China.

Vacuum quenching furnace has the following characteristics:

1. Strict vacuum sealing is known to all that the heating and quenching of the workpiece are carried out in a closed vacuum furnace during vacuum heat treatment. Therefore, it is very important to ensure the vacuum degree of the vacuum quenching furnace to ensure the quality of the vacuum heat treatment of the workpiece. In order to ensure the vacuum performance of the vacuum furnace, the Kejia vacuum furnace body is welded by gas tightly with few holes on it, so as to minimize the chance of vacuum leakage. The components and accessories installed on the vacuum furnace body, such as water-cooled electrodes and thermocouple export devices, are also sealed structures.

2. Most heating and insulation materials can only use vacuum quenching furnace heating and insulation lining materials in vacuum and high temperature. These materials have the characteristics of high temperature resistance, low vapor pressure, good radiation effect and low thermal conductivity. For example, most vacuum quenching furnaces in China mainly use graphite as heating and insulation material. It is easy to oxidize when heated in atmosphere. Therefore, these heating and insulation materials can not be used in conventional heat treatment furnaces. The vacuum absorption of imported alumina fibers in Kejia vacuum furnace has better thermal insulation effect.vacuum-atmosphere-muffle-furnace-for-laboratory-gas-heat-treatment

3. The shell, cover, electrothermal element (water-cooled electrode) and heat insulation of vacuum furnace of water-cooled device all work in vacuum and heating state. In this extremely disadvantageous condition, it is necessary to ensure that the structure of each component is not deformed and damaged, and that the vacuum sealing ring is not too hot or burnt. Therefore, the components are equipped with water-cooling devices according to different conditions to ensure the normal operation of the vacuum furnace and sufficient service life.

4. When the vacuum degree reaches several hundred Pa, the glow discharge of the electrified conductor will occur at a higher voltage in the vacuum heat treatment furnace with low voltage and high current. Serious arc discharge will occur and the electric heating elements and insulation layer will be burned down, resulting in major accidents and losses. Therefore, the working voltage of the electric heating element of the vacuum heat treatment furnace generally does not exceed 80-100 volts. At the same time, the electrothermal elements should avoid the parts with sharp ends and the spacing between electrodes should not be too narrow to prevent the occurrence of glow discharge or arc discharge. 5. The high degree of automation is due to the operation of heating and cooling of metal workpieces, which requires dozens or even dozens of actions to complete. These actions are carried out in the vacuum furnace, which is inaccessible to the operator. At the same time, some actions such as heat preservation after the end of the quenching process of metal workpieces need to be more than one action and to be completed in a relatively short time. In such a rapid condition to complete many actions, it is easy to cause operator tension and constitute misoperation. Therefore, a higher automation program is adopted to control the vacuum furnace.Lowest-price-designed-programmable-temperature-control-lab-vacuum-furnace

How to select the heating chamber of vacuum degreasing sintering furnace?

The choice of vacuum degreasing sintering furnace should be based on its use and the performance of its components. Today, the vacuum furnace manufacturer introduces the selection of heating chamber for vacuum degreasing sintering furnace.stainless-steel-sintering

Selection basis of heating chamber of vacuum degreasing sintering furnace:

1. Graphite reflecting screen: Hard felt and soft felt are usually used in vacuum furnace. They are suitable for quenching, tempering and annealing of common steel. High temperature brazing, powder metallurgy and sintering, etc. Vacuum furnace manufacturer.

2. Metal heat shield; stainless steel and molybdenum are usually used in vacuum furnaces. Molybdenum reflector screen is suitable for high temperature and high demand for furnace environment, such as: superalloy, titanium alloy, magnetic data, quenching, annealing, high temperature brazing, sintering, etc. Stainless steel rice shooting screen is suitable for tempering, low temperature annealing, aging, vacuum aluminium brazing, and some low temperature furnace type selection. Vacuum furnace manufacturer.annealing-processes

Maintenance and Maintenance of Vacuum Sintering Furnace

After long-term use of vacuum sintering furnace, some impurities will remain in the furnace. We need regular maintenance to avoid damage to equipment. Today our vacuum furnace manufacturer focuses on the introduction of vacuum sintering furnace maintenance knowledge!molybdenum-powder-molding-sintering

1. When the vacuum sintering furnace is shut down, the vacuum state in the furnace should be kept below 6.65*104pa.

2. To clean the dust in the oven, soak the silk cloth with ethanol or gasoline and dry it.

3. When disassembling and assembling parts such as vacuum system or sealing structure on equipment, they should be cleaned with ethanol or gasoline, then coated with vacuum grease after drying and reassembled.

4. Avoid frequent scrubbing and keep the shell clean. Vacuum furnace manufacturer.

5. Workpiece trucks, material frames and workpieces should be cleaned and then put into the furnace to prevent moisture and impurities from entering.

6. When there are clamps, inaccurate limits and control failures in transmission parts, they should be eliminated immediately to avoid forced operation so as not to damage the equipment.tempering-principle-of-mold-steel

7. Regular refueling or changing of transmission parts. Vacuum furnace manufacturer.

8. Vacuum pumps, valves, measuring instruments, thermal instruments and electrical components and other accessories should be used, maintained and maintained in strict accordance with the instructions.

9. When repairing vacuum sintering furnace, it should be carried out under the condition of power failure. If it needs to be repaired under the condition of live power, it should ensure the absolute safety of maintenance personnel and equipment.sintering-of-titanium-and-titanium-alloy-materials

How does the vacuum sintering furnace work?

The vacuum sintering furnace is a furnace for protectively sintering the heated articles in a vacuum environment, and has various heating methods such as resistance heating, microwave heating, induction heating, and the like. The vacuum induction furnace is a furnace for protectively sintering the heated articles by induction heating, and can be classified into a power frequency, an intermediate frequency, a high frequency, and the like, and can be attributed to a subclass of the vacuum sintering furnace.gas-quenching/1700C-inert-gas-vacuum-atmosphere-furnace

The vacuum sintering furnace can meet the requirements of rapid heating process; the temperature control switcher is controlled by the imported multi-segment intelligent program Celsius controller, the stability and repeatability of the Celsius control switcher is very reliable; the frequency conversion stepless speed regulation is adopted, and the stainless steel mesh belt is transmitted. The new design concept ensures smooth delivery of the product. High temperature vacuum furnace.

The vacuum sintering furnace utilizes the principle of medium frequency induction heating to make the tungsten crucible in the coil generate high temperature and conduct it to the work through thermal radiation. It is suitable for powder molding sintering of refractory alloys such as tungsten, molybdenum and their alloys by scientific research and military units.Vacuum-heating-equipment-plasma-nitriding-furnace

Main measures for increasing vacuum in vacuum furnace

The degree of vacuum is closely related to the production capacity of the device, so how to improve the vacuum degree of the vacuum furnace is a very important issue in the production process.Next-generation-welcomed-gas-quenching-vacuum-furnace
There are two ways to increase the temperature difference of the vacuum furnace during the evaporation process: one to increase the heating steam pressure, and the other is to increase the final numerical effect vacuum. However, increasing the first-effect heating steam pressure will bring about an increase in the post-effect temperature, and the increase in production capacity is not obvious, but will cause the scaling to increase, the operating cycle to be shortened, and the corrosion of the equipment to be increased. Therefore, increasing the vacuum is the first choice to increase the total temperature difference of the system.high-temperature/brazing-vacuum-brazing-furnace-of-diamond-tool-PCD-PCBN-CVD-CBN

In recent years, high-temperature vacuum furnace manufacturers have adopted a new type of atmospheric mixing cooler to replace the traditional mixing cooler and achieved good results. The new type of refrigerating device actually replaces the sprinkler with a nozzle. The cooling water forms a water mist through the nozzles whose shape is distributed in the refrigerating device, which greatly increases the vapor-liquid contact area between the cooling water and the secondary steam, and improves the cooling. The efficiency of water utilization, the vacuum furnace thus achieved a higher degree of vacuum. Experiments have shown that the vacuum formed by this type of condenser is more than 2000PA higher than that of the conventional water-spray type mixer.Petroleum-Coke-Rotary-Kiln-Vacuum-Tube-Heat-Treatment-Furnace

Stainless steel tube furnace

Furnace shell: The inner shell is made of 304 stainless steel by welding. Ensure that the overall rigidity and thermal strength are sufficient. The part that is in contact with the high temperature near the furnace door is also made of 304 stainless steel. A heat-conducting heat-dissipating protective cover is added on both sides of the furnace body to ensure that the surface temperature rise of the furnace shell is ≤60 °C.oil-cooler-brazing

Furnace: The refractory furnace is made of 1500 high purity alumina fiber. Long-term working temperature 950 °C physical and chemical indicators are implemented according to national standards. The thermal insulation material consists of high-alumina lightweight foam brick, yttrium aluminum fiber super-hard board, zirconium-aluminum-containing aluminum needle-punched blanket, and yttrium aluminum refractory fiber product. The thermal insulation effect is good and has good energy-saving effect.copper-brazing

Electric heating element: use high quality silicon carbon rod.vacuum-heat-treatment-process-and-equipment-for-magnetic-materials

Furnace parts: standard parts, electrical components, and wires are all made of high-quality spare parts.pcd-pcbn-vacuum-brazing-furnace

Cautions for the Use of Vacuum Furnace

The safe use of vacuum furnace is an important part of safe production. Besides doing experiments, it is better not to stay near the high temperature furnace tube. The following points should be paid attention to when using:

1. After the completion of the experiment, the special gas should be turned on and the N2 flow can be retained. Vacuum atmosphere furnace tubes should be kept at standby temperature, and carefully check whether other power supply is turned off, if not, turn off at will.vacuum-heat-treatments

2. Avoid inhaling all kinds of gases from furnace or treatment tank when using tube electric furnace, so as to cause poisoning.

3. When not in use, the front end of the long and short push rod of the furnace should be placed upwards to avoid pollution.die-steel-oil-quenching

4. When wafers enter and exit the furnace mouth to accept boat holder, try not to touch the tube mouth of the tube furnace, so as to avoid the tube being polluted.

In the course of the test, please save the use of pure water. Once hidden safety hazards or abnormal phenomena are found, the relevant technicians should be notified at the first time to prevent accidents.tool-steel-oil-qenching

Vacuum Heat Treatment Knowledge

1. Nitrogen should not be used as cooling gas when titanium alloy is treated in vacuum furnace, because titanium and nitrogen react at high temperature to form golden titanium nitride.

2. All the movable connections of the vacuum furnace are sealed by O-ring, which is cooled by water.gas-turbine-vacuum-casting-technology

3. When the workpiece is quenched in vacuum, vacuum quenching oil should be used, which has lower saturated vapor pressure.

4. Vacuum furnace maintenance should be in the state of vacuum or pure nitrogen, to avoid suction and moisture absorption when not in use at ordinary times.

5. The pressure rise rate of domestic vacuum furnaces should not be less than 1.33Pa/h, and the standard of some foreign enterprises should be 0.67Pa/h.

6. Vacuum heating is mainly radiation, and the workpiece should be kept spacing in the furnace.titanium-alloy-vacuum-melting

7. During the heating process, the workpiece and the material in the furnace will deflate and the vacuum will decrease.

8. The heating temperatures of vacuum tempering, vacuum annealing, vacuum solid solution treatment and vacuum aging are generally the same as those of conventional treatment.vacuum-heat-treatment-furnace-in-automobile-exhaust-gas-purifier

9. Vacuum tempering furnace should have quick cooling device. The pressure of cooling water should be greater than 0.2 Mpa and the flow rate should be adjustable.

10. Cooling gas: steel generally uses 99.995% pure nitrogen, superalloy 99.999% nitrogen or argon, titanium alloy 99.995% argon.

11. Warming up: After putting in the workpiece, it is usually pre-pumped to 6.67 Pa before heating up.aeroengine-vacuum-melting

Chemical heat treatment

1. Improving the wear resistance of parts

High carbon martensite hardening surface can be obtained by carburizing and quenching of steel parts, and diffusion hardening surface of alloy nitride can be obtained by nitriding of alloy steel parts. The surface hardness of steel parts obtained by these two methods can reach HRC58-62 and HV800-1200, respectively. Another way is to form anti-wear and anti-bonding film on the surface of steel parts to improve the friction conditions, which can also improve the wear resistance.low-temperature-vacuum-tempering-furnace

For example, the formation of Fe3O4 thin films on steam treated surfaces has anti-bonding effect, and the formation of Fe2SO4 thin films by surface vulcanization has both anti-wear and anti-bonding effects. In recent years, multi-element Co-penetration technology, such as oxygen-nitriding, sulphur-nitriding, carbon-nitrogen-sulphur-oxygen-boron five-element co-penetration, can form high hardness diffusion layer and anti-adhesion or anti-wear film at the same time, effectively improve the wear resistance of parts, especially the anti-adhesion and wear resistance.vacuum-heat-treatment-equipment-selection

2. Improving the Fatigue Strength of Parts

Carburizing, nitriding, soft nitriding and carbonitriding all can strengthen the surface of steel parts, while forming residual compressive stress on the surface of parts, effectively improving the fatigue strength of parts.vacuum-induction-furnace-manufacturer

3. Improving the Corrosion Resistance and High Temperature Oxidation Resistance of Parts

For example, nitriding can improve the atmospheric corrosion resistance of steel parts; after aluminizing, chromizing and siliconizing, dense and stable protective films of Al2O3, Cr2O3 and SiO 2 are formed by interaction with oxygen or corrosion medium, which can improve the corrosion resistance and high temperature oxidation resistance. Usually, the hardening of steel will bring about embrittlement at the same time. When the surface hardening method is used to improve the surface hardness, the core is still in a good toughness state, so it can better solve the contradiction between hardening and toughness of steel parts than the whole hardening method of parts. Chemical heat treatment makes the chemical composition and structure of steel surface change at the same time, so it is better than surface quenching and hardening methods such as high, medium frequency induction and flame quenching. If the infiltration elements are selected properly, a surface layer suitable for various performance requirements of parts can be obtained.vacuum-high-pressure-gas-quenching-furnace

Quenching heat treatment

In the heat treatment industry, what are the misunderstandings about quenching and heat treatment? Today Xiaobian will come to talk with you about the misunderstanding of quenching and heat treatment.vacuum-furnace-for-metal-smelting

1. The workpiece after quenching and heat treatment is not cold to room temperature, and can not be tempered?vacuum-heat-treatment-process

Some people think that after quenching heat treatment, the tempering heat treatment process can not be entered before cooling to room temperature. In fact, many kinds of steels, especially low and medium carbon steels, have higher martensite transformation end point than room temperature. When they are cooled to room temperature, they tend to crack. After quenching heat treatment, they can be transferred to tempering heat treatment process as soon as possible.

2. Quenching and heat treatment of the workpiece must be tempered with temperature?plasma-nitriding-furnaces

It is not advisable to use this method. The temperature before tempering after quenching should be determined according to the martensitic transformation point of steel grades. In order to prevent quenching cracking, we can not speculate on it. Tempering with temperature is adopted in a general way.vacuum-induction-melting-furnaces

Heat Treatment of Automotive Parts

There are five main heat treatment processes for automobile parts: annealing and normalizing, quenching, tempering, aging and tempering, surface quenching and chemical heat treatment. Today, Xiaobian mainly introduces several commonly used heat treatment processes for automotive parts.Industrial-vacuum-pressure-free-sintering-furnace-for-diamond-segments

1. Carburizing Heat Treatment of Automotive Parts

The main purpose of carburizing heat treatment is to obtain good fatigue resistance and wear resistance of parts and to ensure the reliability of Parts'performance. Generally, differential gear, transmission shaft gear, steering shaft gear, engine piston and gear parts of automobile drive axle need carburizing heat treatment.vacuum-furnace-range-up-to-3000c

2. Tempering and Heat Treatment of Automotive Parts

The quenching and tempering heat treatment of automobile parts can be divided into protective atmosphere quenching and tempering heat treatment and general quenching and tempering heat treatment. Protective atmosphere conditioning and heat treatment can ensure that parts do not produce surface oxidation, peeling and other defects in the process of heat treatment, and ensure the surface quality of parts. If the quenched and tempered parts need follow-up processing, general heat treatment is carried out.Industrial-vacuum-gas-quenching-furnace-with-high-pressure

Heat treatment of aluminium alloy

The purpose of casting heat treatment of aluminium alloy is to improve mechanical properties and corrosion resistance, stabilize dimensions, and improve processing properties such as cutting and welding. Because the mechanical properties of many as-cast aluminium alloys can not meet the application requirements, except for ZL102 of Al-Si system, ZL302 of Al-Mg system and Zl401 of Al-Zn system, the other casting aluminium alloys need to be further improved by heat treatment of aluminium alloys, which include the following aspects:Three-chamber-Horizontal-Oil-and-Gas-Quenching-Vacuum-Furnace

(1) Eliminate the internal stress caused by uneven cooling rate during solidification due to the structure of castings (uneven wall thickness, large thickness of junction), etc.High-Temperature-Metal-Melting-Furnace

(2) Improve the mechanical strength and hardness of the alloy, improve the metallographic structure, and ensure that the alloy has certain plasticity, cutting and welding properties.

(3) Stabilizing the structure and size of castings, preventing and eliminating high temperature phase transformation and changing the volume;

(4) Eliminate intergranular segregation and component segregation to homogenize the structure.Box-type-lab-inert-gas-vacuum-heat-treatment-furnace

Induction Melting Heating Technology

Induction melting is a kind of induction heating technology. After countless research and development, induction melting equipment has a brand-new technical outlook.

As we all know, the great scientist Faraday founded the concept of modern induction heating, which was based on the change of current in the primary coil and the induction of current in the close secondary coil. In the heating process of metal workpiece, a layer of induction coil should be added outside the workpiece that needs heating. When a certain frequency AC passes through the winding induction coil outside the metal, a frequency alternating flux can be generated automatically. Under the action of alternating flux, the metal workpiece will generate an induction potential, and then a certain induction current will be generated and recharged. The heating effect of overcurrent on metal can finally achieve the purpose of heating the workpiece.high-temperature-vacuum-furnace

Induction melting technology has the characteristics of fast melting speed, reducing the loss caused by oxidation in the process of smelting metal. It can also be used in special processes, such as vacuum melting. Vacuum and induction heating technology can not only avoid oxidation and decarbonization caused by combustion, but also can be used to produce alloys that can not be produced by other methods. In Nd-Fe-B smelting industry, vacuum and induction heating technology has developed to a relatively mature stage.vacuum-heat-treatment-furnace-price

Induction heating technology has been fully developed and applied in China, especially in the automotive field. Induction heating technology has played a more unusual role. In the heat treatment of automotive parts, the weight of parts treated by induction heating has accounted for more than 60% of the total heat treatment parts. Therefore, in order to better apply this technology in more fields, we must also conduct in-depth research and Discussion on induction heating technology.buy-vacuum-furnace