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Vacuum heat treatment processing technology popularization
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Author:business-101
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Published time: 2020-06-23
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Vacuum heat treatment processing technology popularization
What is vacuum heat treatment processing technology?
Mainly refers to a new type of heat treatment technology that combines vacuum technology and heat treatment technology. Among them, the vacuum environment where vacuum heat treatment is located refers to an atmosphere environment below one atmospheric pressure, including low vacuum, medium vacuum, high vacuum and ultra high vacuum, etc. Therefore, vacuum heat treatment actually belongs to atmosphere control heat treatment.
Vacuum heat treatment refers to that all and part of the heat treatment process is performed in a vacuum state. Vacuum heat treatment can realize almost all the heat treatment processes that can be involved in conventional heat treatment, but the quality of heat treatment is greatly improved.
Compared with conventional heat treatment, vacuum heat treatment processing technology can simultaneously achieve no oxidation, no decarburization, no carburization, can remove the phosphorus debris on the surface of the workpiece, and has the function of degreasing and degassing, so as to achieve the effect of bright surface purification.
1. Application of vacuum heat treatment technology
In fact, vacuum heat treatment processing technology was applied earlier in foreign countries. In 1968, Hayes Corporation of the United States and Japan Vacuum Research Institute successively developed vacuum quenching oil and aqueous quenching medium. Therefore, vacuum quenching technology was obtained in the vacuum processing heat treatment industry. Rapid development, from single-chamber furnace to multi-combination machine group, from general vacuum quenching to high-pressure gas quenching, vacuum water quenching, vacuum carburization, vacuum carbonitriding and multi-component co-infiltration. After decades of efforts in China, vacuum furnace manufacturers have greatly improved their design, manufacturing level and quality. Domestic vacuum equipment has gradually replaced vacuum equipment imported from abroad, which has reduced the production of users. The cost makes the application range of vacuum heat treatment expand rapidly.
2. Process principle of vacuum heat treatment technology
Using the characteristics of metal phase transformation in a vacuum state, the thermodynamics and kinetics of the solid phase transition do not change under a vacuum within 0.1 MPa of atmospheric pressure. When formulating the vacuum heat treatment process specification, it can be based on the principle of solid phase transformation under normal pressure, and can refer to the data of various types of tissue transformation under normal pressure. At the same time, under the effect of vacuum degassing, the physical properties and mechanical properties of metal materials can be improved. When heated under vacuum, elements on the surface of metal workpieces will evaporate. The metal realizes the vacuum degree required for non-oxidizing heating, and the surface purification function realizes less oxidation and less off.
Mainly refers to a new type of heat treatment technology that combines vacuum technology and heat treatment technology. Among them, the vacuum environment where vacuum heat treatment is located refers to an atmosphere environment below one atmospheric pressure, including low vacuum, medium vacuum, high vacuum and ultra high vacuum, etc. Therefore, vacuum heat treatment actually belongs to atmosphere control heat treatment.
Vacuum heat treatment refers to that all and part of the heat treatment process is performed in a vacuum state. Vacuum heat treatment can realize almost all the heat treatment processes that can be involved in conventional heat treatment, but the quality of heat treatment is greatly improved.
Compared with conventional heat treatment, vacuum heat treatment processing technology can simultaneously achieve no oxidation, no decarburization, no carburization, can remove the phosphorus debris on the surface of the workpiece, and has the function of degreasing and degassing, so as to achieve the effect of bright surface purification.
1. Application of vacuum heat treatment technology
In fact, vacuum heat treatment processing technology was applied earlier in foreign countries. In 1968, Hayes Corporation of the United States and Japan Vacuum Research Institute successively developed vacuum quenching oil and aqueous quenching medium. Therefore, vacuum quenching technology was obtained in the vacuum processing heat treatment industry. Rapid development, from single-chamber furnace to multi-combination machine group, from general vacuum quenching to high-pressure gas quenching, vacuum water quenching, vacuum carburization, vacuum carbonitriding and multi-component co-infiltration. After decades of efforts in China, vacuum furnace manufacturers have greatly improved their design, manufacturing level and quality. Domestic vacuum equipment has gradually replaced vacuum equipment imported from abroad, which has reduced the production of users. The cost makes the application range of vacuum heat treatment expand rapidly.
2. Process principle of vacuum heat treatment technology
Using the characteristics of metal phase transformation in a vacuum state, the thermodynamics and kinetics of the solid phase transition do not change under a vacuum within 0.1 MPa of atmospheric pressure. When formulating the vacuum heat treatment process specification, it can be based on the principle of solid phase transformation under normal pressure, and can refer to the data of various types of tissue transformation under normal pressure. At the same time, under the effect of vacuum degassing, the physical properties and mechanical properties of metal materials can be improved. When heated under vacuum, elements on the surface of metal workpieces will evaporate. The metal realizes the vacuum degree required for non-oxidizing heating, and the surface purification function realizes less oxidation and less off.
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