Vacuum Tempering Furnace Basic Summary

Vacuum heat treatment of vacuum tempering furnace, which combines vacuum technology with heat treatment, refers to all and part of the heat treatment process carried out in vacuum. Vacuum heat treatment furnace has high thermal efficiency, can achieve rapid heating and cooling, can achieve no oxidation, no decarbonization, no carburization, can remove the phosphorus chip on the surface of the workpiece, and has the function of degreasing and degassing, so as to achieve the effect of surface bright purification.

Industrial furnace manufacturers divide vacuum into low, medium, high and ultra-high vacuum according to our country. Vacuum heat treatment can achieve almost all heat treatment processes, such as quenching, annealing, tempering, carburizing, nitriding, gas quenching, oil quenching, nitrate quenching, water quenching, vacuum brazing, sintering, surface treatment and so on. Vacuum heat treatment furnace has high thermal efficiency, can achieve rapid heating and cooling, can achieve no oxidation, no decarbonization, no carburization, can remove the phosphorus chip on the surface of the workpiece, and has the function of degreasing and degassing, so as to achieve the effect of surface bright purification. Generally speaking, the processed workpiece is heated slowly in the furnace, the difference of internal heat temperature is small, and the thermal stress is small, so the deformation is small. The qualified rate of products is high. The utility model can reduce the cost and has the function of degassing, thereby improving the mechanical performance and service life of the work. Good working environment, safe operation, no pollution and pollution. The treated workpiece has no danger of hydrogen embrittlement. It can prevent surface hydrogen embrittlement of titanium and refractory metal shell. The vacuum heat treatment process has good stability and repeatability. With these advantages, the development of vacuum heat treatment equipment and technology has been paid more and more attention and applied more and more widely.

Oxygen, water vapor, carbon dioxide and other oxidizing gases exist in the air when metal materials are heated in air furnaces. Oxygen films or oxide scales are easily formed on the heated metal surface due to the oxidation of these gases with the metal, and the original metallic luster is completely lost. These gases also react with carbon in metals to decarbonize their surfaces. If the furnace contains carbon monoxide or methane gas, it will also increase the carbon on the metal surface. For Ti, Zr and insoluble metals W, Mo, Nb and Ta with very active chemical properties, heating in an air furnace not only generates oxides, hydrides and nitrides, but also absorbs these gases and diffuses them into the metal, which seriously deteriorates the properties of metal materials. These disadvantages, such as oxidation, decarbonization, carburization, gas absorption and even corrosion, are sometimes unavoidable when heated in controlled atmosphere or salt bath furnaces. In order to solve this problem, the usual practice of mesh belt furnace manufacturers is to leave processing allowance before heat treatment, and remove oxidation and decarbonization layer after heat treatment.

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