Powder metallurgy is the process of making metal powder or metal powder (or a mixture of metal powder and non-metallic powder) as raw material, forming and sintering, manufacturing metal materials, composite materials and various types of products. At present, powder metallurgy technology has been widely used in transportation, machinery, electronics, aerospace, weapons, biology, new energy, information and nuclear industry and other fields, become the new material science one of the most dynamic branch. Powder metallurgy technology with significant energy saving, saving material, excellent performance, high precision and stability and a series of advantages, is very suitable for mass production.