Vacuum Tempering Furnace for Metal Material
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.
Vacuum heat treatment is a comprehensive technology combining vacuum technology with heat treatment. It refers to all and part of heat treatment process carried out in vacuum. China divides vacuum into low, medium, high and ultra-high vacuum. 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.
Generally, the metal material is heated in an air furnace. Oxygen, water vapor, carbon dioxide and other oxidizing gases are present in the air, and the oxidation of these gases and metals tends to cause an oxide film or scale on the surface of the heated metal, completely losing the original Metallic luster. At the same time, these gases react with the carbon in the metal to decarburize the surface. If the furnace contains carbon monoxide or methane gas, it will also carbonize the metal surface. For the chemically active Ti, Zr and insoluble metals W, Mo, Nb, Ta, etc., heating in an air furnace, in addition to generating oxides, hydrides, nitrides, but also to absorb these gases and to the inside of the metal Diffusion causes the performance of metallic materials to deteriorate seriously. These oxidizing, decarburizing, carbonizing, inhaling and even causing corrosion problems are heated in a controlled atmosphere furnace or a salt bath furnace, and sometimes it is difficult to avoid. In order to solve this problem, the usual practice is to leave a machining allowance before the heat treatment of the workpiece, and to remove the oxidation and decarburization layer after the heat treatment.