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Basic process of powder metallurgy
02-23-2021, 11:27 AM,
Post: #1
Basic process of powder metallurgy
Basic process of powder metallurgy

1. Preparation of raw powder. The existing milling methods can be roughly divided into two categories: mechanical method and physical-chemical method. The mechanical method can be divided into: mechanical crushing and atomization method; physical and chemical method can be divided into: electrochemical corrosion method, reduction method, chemical method, reduction chemical method, vapor deposition method, liquid deposition method and electrolysis method. The most widely used methods are reduction, atomization and electrolysis.

2. The powder is formed into a billet of a desired shape. The purpose of forming is to make a certain shape and size of the compact, and make it have a certain density and strength. Forming methods are basically divided into pressure forming and non pressure forming. Compression molding is widely used in pressure molding.

3. Sintering of green block. Sintering is a key process in powder metallurgy. The final physical and mechanical properties are obtained by sintering. Sintering is divided into unit system sintering and multi system sintering. For solid phase sintering of unit system and multicomponent system, the sintering temperature is lower than the melting point of metal and alloy; for liquid phase sintering of multicomponent system, the sintering temperature is generally lower than the melting point of refractory component, but higher than that of fusible component. In addition to ordinary sintering, there are also some special sintering processes, such as loose pack sintering, melt leaching, hot pressing and so on.

4. Post processing of products. The treatment after sintering can be carried out in various ways according to different product requirements. Such as finishing, oil immersion, machining, heat treatment and electroplating. In addition, in recent years, some new processes such as rolling and forging have also been applied to the sintering process of P / M materials, and good results have been achieved.

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