Powder metallurgy is the preparation of metal powder or the use of metal powder (or a mixture of metal powder and non-metal powder) as raw materials, after forming and sintering, to produce metal materials and composite materials And industrial technology of various types of products. Powder metallurgy technology has been widely used in the fields of transportation, machinery, electronics, aerospace, weapons, biology, new energy, information and nuclear industry, and has become one of the dynamic branches of new materials science. Powder metallurgy technology has a series of advantages such as significant energy saving, material saving, excellent performance, high product precision and good stability, which is very suitable for mass production. In addition, some materials and complex parts that cannot be prepared by traditional casting methods and mechanical processing methods can also be manufactured with powder metallurgy technology, which has attracted the attention of the industry.