Contact is one of the key components of switchgear. The main performance and life of switchgear depend to a large extent on the quality of the contact material. Contact materials are usually required to have good electrical conductivity, low contact resistance, high resistance to fusion welding, high resistance to arc erosion, and resistance to material transfer. High compressive strength and high breaking capacity. The microstructure of the contact material has an important influence on its macroscopic properties. The electrical properties of the contact material, such as welding resistance, arc ablation resistance and pressure resistance are not only related to the composition of the contact material, but also to the composition of the material. related to the size of the grains.