Due to the superior performance and low cost of powder metallurgy materials, powder metallurgy parts are used more and more widely in automobiles. Among them, there are shock absorber parts, guides, pistons and low valve seats in the automobile chassis; ABS in the braking system Sensors, brake pads, etc.; pump parts mainly include key components in fuel pumps, oil pumps, and transmission pumps; in engines, there are pipes, seats, connecting rods, bearing seats, and key components of variable valve timing (VVT) And exhaust pipe support, etc.; there are parts such as synchronization hub and planetary gear carrier in the transmission. At the same time, the automobile manufacturing industry is the largest user of MIM, and the most typical uses are engine parts and gearbox parts with high temperature and high wear resistance.