The basic process of powder metallurgy

1. Preparation of raw material powder.The present methods of making powder can be divided into two categories: mechanical and physicochemical.Mechanical method can be divided
into: mechanical can be divided into: mechanical crushing and atomization method;Physical and chemical methods are divided into: electrochemical corrosion, reduction,
chemical, reduction-chemical, vapor deposition, liquid deposition and electrolysis.The most widely used methods are reduction, atomization and electrolysis.
2. The powder is formed into the blank block of the desired shape.The purpose of forming is to make a certain shape and size compactor, and make it have a certain density and
strength.Molding methods are basically divided into compression molding and no pressure molding.
3. Sintering of blank blocks.Sintering is a key process in powder metallurgy. The final physical and mechanical properties are obtained by sintering after forming.Sintering
can be divided into unit sintering and multiple sintering.The sintering temperature is lower than the melting point of the metal and alloy used in solid phase sintering of
unit and multicomponent systems.For liquid phase sintering of multi-distant system, the sintering temperature is generally lower than the melting point of the refractory
component, but higher than the melting point of the fusible component.In addition to ordinary sintering, there are special sintering processes such as loose sintering, melting
and immersion, hot pressing, etc.
4. Follow-up treatment of products.After sintering treatment, according to the different requirements of the product, take a variety of ways.Such as finishing, oil immersion,
machining, heat treatment and electroplating.