Powder metallurgy is a method of producing metal powder and forming metal powder or a mixture of non-metallic powder into products through forming and sintering processes. It can not only produce special materials that are difficult to obtain by ordinary melting methods, but also produce various A variety of precise mechanical parts, saving labor and materials. However, the cost of the mold and metal powder is relatively high, and it is not suitable for small batches or large product sizes. Compared with traditional material technology, powder metallurgy materials and processes have the following characteristics:
1. The powder metallurgy process is carried out below the melting point of the base metal, so it is possible to obtain a variety of heterogeneous special functional composite materials and products such as a variety of metals, metals and ceramics, metals and plastics with widely differing melting points and density.
2. Improve material performance. The fine metal or alloy powder prepared by a special method has a very fast solidification speed and fine and uniform grains, which ensures the uniform organization of the material, stable performance, and good cold and hot processing performance, and the powder particles are not affected by alloy elements and content The restrictions can increase the strengthening phase content, thereby developing new material systems.
3. Using various forming processes, powder raw materials can be directly formed into blanks or net-shaped parts with little or no excess, which greatly reduces the amount of machining. Improve material utilization and reduce costs.
There are many varieties of powder metallurgy, mainly including: tungsten and other refractory metals and alloy products; tungsten carbide (WC), titanium carbide (TiC), tantalum carbide (TaC) and other hard alloys using Co and Ni as binders Used to manufacture drill bits, turning tools, milling cutters in cutting tools and wear-resistant tools, and can also make molds; porous materials such as Cu alloy, stainless steel and Ni, used to manufacture sintered oil-containing bearings, sintered metal filters and textile rings, etc. . With the development of powder metallurgy production technology, powder metallurgy and its products will be more widely used.