Ion nitriding were on the surface of the mould can produce continuous nitride layer (Bai Liangceng), it is very useful to improve the mold resistance welding, thermal melting loss, anti erosion ability, also can make the mold surface to improve wear resistance. Ion nitriding besides the advantages of conventional nitriding, nitriding speed (there is 2-3 times of gas nitriding, nitriding) easy control, low processing temperature, small thermal deformation, surface state after treatment, energy saving and pollution-free good etc..
The nitride layer than the oxide layer is thicker and more compact, more resistant to erosion on the protection of aluminum alloy, die surface can play a positive role. However, considering the thermal fatigue property of die, the nitride layer because of relatively hard, easy to form thermal fatigue crack. Once the formation of micro cracks in the nitride layer after resistance to molten aluminum alloy soldering and melting loss effect will become worse. Therefore, if the solution of thermal fatigue problem well die nitriding layer, nitriding will be a very good die surface treatment process.