Nitriding is a heat treatment method in which nitrogen atoms are infiltrated into the surface of a workpiece at a specific temperature and in a specific medium. After the nitriding, the surface hardness, wear resistance, fatigue strength and corrosion resistance of the mold are greatly improved, and the mold is after the carburizing treatment. Nitriding is different from carburizing. It is carried out at a lower temperature and has a small deformation of the mold and is suitable for molds with high precision.
Common nitriding processes for molds include liquid nitriding, gas nitriding and ion nitriding. Compared with the traditional nitriding method, ion nitriding has a fast osmotic speed, can control the nitriding structure through different gas components, reduce the surface brittleness of the nitriding layer, and the hardness distribution of the permeable layer is gentle, and it is not easy to cause spalling and thermal fatigue. Energy-saving and pollution-free. Therefore, almost all molds are suitable. However, ion nitriding does not have a good effect on the area of the mold having small holes or grooves. For some plastic molds with complicated shapes, it is not easy to uniformly heat, and the obtained layer is not very uniform.