(1) production of powder. The production process of powder includes the preparation of powder and mixing of powder. In order to improve the formability and plasticity of powders, plasticizers such as oil, rubber or paraffin are usually added.
(2) suppression of molding. The powder is pressed into the desired shape at 15-600MPa pressure.
(3) sintering. In a high temperature furnace or vacuum furnace with protective atmosphere. Sintering is different from metal melting. When sintering, at least one element is still in solid state. In the process of sintering, a series of physical and chemical processes, such as diffusion, recrystallization, welding, fusion and dissolution, have become a metallurgical product with a certain porosity.
(4) post treatment. Under normal circumstances, sintered parts can be used directly. But for some parts with high precision and high hardness and wear resistance, it is necessary to conduct post-processing after sintering. The post-processing includes finishing, rolling, extrusion, quenching, surface quenching, oil immersion and infiltration.