Along with the rapid development in the field of vacuum heat treatment, vacuum carburizing furnace and vacuum carburizing technology also got more widely used in all walks of life, with the development of the aviation industry, in order to improve the use of materials, temperature and wear resistance, high alloy steel and stainless steel carburizing requirements are put forward. Traditional carburizing process object is low carbon steel and low carbon alloy steel, its technology is short of high alloy steel and stainless steel processing requirements, so you need to use vacuum carburizing furnace and vacuum carburizing technology to deal with this type of material.
The key technologies of high alloy steel and stainless steel carburizing has two points: first, the removal of material surface passivation membrane, high alloy steel and stainless steel passivation film is alloy element oxide film, nature is stable, not easy to remove, adopt vacuum carburizing technology these problems can be solved. Metal surface oxide film and a degree of rust layer in the condition of vacuum heating will produce decomposition, purified reduction and makes the metal surface, which puts it on the metal surface cleaning, activation. Using vacuum carburizing furnace for heating vacuum carburizing process for vacuum without oxygen, can effectively remove the passive film on the surface of the stainless steel, and because in carburizing process does not produce oxidizing atmosphere, the surface of the stainless steel will not produce new passivation membrane. Therefore, the use of vacuum carburizing can successfully solve the problem of stainless steel passivation membrane removal, and do not need to add any chemicals, no operating difficulties and pollutants generated;
Second, stainless steel and high temperature alloy steel carburizing need temperature is higher, due to the heating element of vacuum carburizing furnace and thermal insulation layer is the graphite and carbon felt, vacuum under the temperature of heat resistance can reach 1700 ℃, thus can easily achieve high temperature carburizing. The ordinary carburizing furnace does not have the condition. The current advanced vacuum carburizing furnace top temperature of 1350 ℃, can satisfy completely the requirements of any stainless steel carburizing temperature.
The vacuum carburizing furnace and vacuum carburizing technology also solve the problem of high quality carburizing and low porosity and uniform carburizing of the aviation parts, and improve the speed and efficiency of the carburizing. In recent years, the number of vacuum carburizing furnaces and related equipment has increased rapidly, and the application scope has been expanded continuously.