Vacuum Furnace of Vacuum Nitriding Technology

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by yanyan » Mon May 20, 2019 10:43 am

Vacuum Furnace of Vacuum Nitriding Technology

Vacuum nitriding is also known as vacuum exhaust nitrocarburizing. As the name implies, vacuum nitriding technology is vacuum furnace through vacuum technology, clean and activate metal surface. In the process of heating, heat preservation and cooling, trace gases are discharged and activated gases are input. The hardness and toughness of vacuum furnace can be enhanced by vacuum nitriding technology.

If the chromium content in the material is very high, its hardness will also increase. The hardness of the single-phase epsilon compound layer varies with the chromium content of the material: when the chromium content of the material is 13%, the hardness is 1200HV, and when the chromium content of the material reaches 18%, the hardness reaches 1500HV. When the chromium content of the material is 25%, the hardness can reach 1700HV. The wear resistance of single-phase epsilon compound layer with high chromium content is very high. It has high temperature resistance, low temperature resistance and wear resistance. The hardness and toughness of single-phase epsilon compound layer are high, so it is easy to cause cracks in forging die in the early stage of casting, and pinholes are easy to appear in vacuum furnace during welding repair.

Vacuum nitriding technology can harden steel. The principles of vacuum nitriding and ion nitriding are different. Vacuum nitriding requires that steel be heated in a vacuum furnace first. After heating, a small amount of gas is washed in. Then nitrogen atoms gradually permeate and diffuse into the steel, gradually achieving hardening. Ion nitriding only heats the surface of steel, then the active nitrogen ion penetrates into the surface of steel, and then a series of chemical reactions occur, which makes the hardness of steel increase. The steel processed by ion nitriding technology is not as good as that processed by vacuum nitriding technology. Because this technology only needs to process the surface of steel, it does not need vacuum furnace to heat.

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yanyan
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