What is a vacuum tempering furnace? What is the role of vacuum tempering furnace? North vacuum Have an overview for you
The vacuum heat treatment of the vacuum tempering furnace, that is, the combination of vacuum technology and heat treatment, means that all and part of the heat treatment process is carried out under vacuum. The vacuum heat treatment furnace has high thermal efficiency, can realize rapid temperature rise and temperature drop, can realize no oxidation, no decarburization, no carburization, can remove the phosphorous chips on the surface of the workpiece, and has the functions of degreasing and degassing, thereby achieving the effect of surface bright purification.
Vacuum heat treatment, that is, the combination of vacuum technology and heat treatment, refers to the combination of all the parts of the heat treatment process under vacuum. China divides vacuum into low, medium, high and ultra-high vacuum. Vacuum heat treatment can almost achieve all heat treatment processes, such as quenching, annealing, tempering, carburizing, nitriding, gas quenching, oil quenching, nitrate quenching, water quenching, etc. in the quenching process, vacuum brazing, Sintering, surface treatment, etc. The vacuum heat treatment furnace has high thermal efficiency, can realize rapid temperature rise and temperature drop, can realize no oxidation, no decarburization, no carburization, can remove the phosphorous chips on the surface of the workpiece, and has the functions of degreasing and degassing, thereby achieving the effect of surface bright purification. Generally, the workpiece to be processed is slowly heated in the furnace, the internal heat temperature difference is small, the thermal stress is small, and the deformation is small. The product qualification rate is high. It can reduce the cost and degassing, thus improving the mechanical performance and service life of the work. Good working environment, safe operation, no pollution and pollution. The workpiece to be processed has no hydrogen embrittlement hazard, and the titanium and refractory metal shells prevent surface hydrogen embrittlement, and the stability and repeatability of the vacuum heat treatment process are good. The advantages of this series, the development of vacuum heat treatment equipment and processes are getting more and more attention and application.
Generally, the metal material is heated in an air furnace. Oxygen, water vapor, carbon dioxide and other oxidizing gases are present in the air. 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 sometimes difficult to avoid in a controlled atmosphere furnace or a salt bath furnace. 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.
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