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Vacuum Heat Treatment Furnace

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Advantages of vacuum heat treatment in aviation field

The aviation industry is a high-tech industry that uses cutting-edge science and technology, selects various new materials with high specific strength, develops forming technology, precision and ultra-precision processing technology, etc. In order to ensure the high performance, safety and reliability of aviation products, the aviation system researched and adopted new heat treatment technologies, took the lead in realizing comprehensive quality control of heat treatment, and accelerated technological transformation.

Vacuum heat treatment is a unique overall modification technology. Key components that have undergone vacuum heat treatment can not only ensure the required organization, mechanical properties and process performance, but also deeply explore the potential of key components, ensure and improve the quality and life of key components, and maximize the potential of materials. This will meet the technical requirements for long life, high performance, and structural weight reduction of key components, and achieve economic affordability of life-cycle costs.

Vacuum heat treatment has the advantages of no oxidation, no decarburization, keeping the surface bright, and at the same time degreasing, degassing, small deformation and easy automatic control. It adapts to the development direction of precision heat treatment and achieves precision shapes and Dimensional control and precision tissue performance control. Therefore, vacuum heat treatment technology is widely used in the annealing, solid solution, aging and stress relief heat treatment of aerospace engine superalloys.

Vacuum heat treatment technologies such as vacuum annealing, vacuum oil quenching, vacuum air quenching, and vacuum tempering are all mature and widely used in production. Research has been completed on the phenomenon of carburization in vacuum oil quenching and its prevention, the depletion rules of vacuum heating elements, the relationship between vacuum degree and brightness, determination of vacuum pressurized gas quenching speed, vacuum heat treatment process and optimization of process parameters. Vacuum heat treatment has been used in important stress-bearing parts such as aircraft landing gear, beams, joints and engine blades.

Vacuum oil quenching

Vacuum oil quenching is the main process of vacuum heat treatment. In recent years, key technical issues such as vacuum quenching oil and vacuum oil quenching surface carburization have been solved. In addition to its application in tool and mold heat treatment, it has also been successfully used for precision heat treatment of important structural parts.
Traditional carburizing process furnaces use low carbon steel and low carbon alloy steel. In recent years, the development of the aviation industry has put forward carburizing requirements for high alloy steel and stainless steel to improve service temperature and wear resistance. Typical materials include 2W10Cr3N:V, 13CrMo4VA (M50N:L), 1Cr11N:2W2MoV, 1Cr12N:2WMoVN, 1Cr17N:2, 1Cr13, 2Cr13, etc.

Vacuum carburizing

There are two technical keys to carburizing high-alloy steel and stainless steel: first, vacuum carburizing can successfully solve the problem of removing the passive film of stainless steel; second, the carburizing temperature is high. Since the heating element and insulation layer of the vacuum carburizing furnace are graphite and carbon felt, the temperature resistance under vacuum can be as high as 1700°C, so high-temperature carburizing can be easily achieved. The maximum temperature of the advanced vacuum carburizing furnace can reach 1350°C, which can fully meet the temperature requirements of carburizing any stainless steel.