What is the production process of powder metallurgy? Powder metallurgy process flow

What is the production process of powder metallurgy? Powder metallurgy process flow

Powder metallurgy is a new type of net near-molding technology, which uses melting, heating, injection and pressing of metal powder to carry out the required mold molding. For some special materials such as refractory metals, refractory metals, high alloy and so on. So what is the production process of powder metallurgy? Let's take a look at zhongwei's precision knitting.

1. First, the preparation of raw powder

At present, milling methods can be divided into two categories: mechanical method and physical-chemical method. Both mechanical crushing and atomization belong to mechanical method; Physical and chemical methods can be divided into electrochemical corrosion method, reduction method, chemical method, reduction-chemical method, vapor deposition method, liquid deposition method and electrolytic method. The most widely used methods are reduction, atomization and electrolysis.

2. Mixture

Mixing is the process of mixing various required powders in a certain proportion and homogenizing them into powder billets. The mixing method is divided into dry type, semi-dry type and wet type.

3. Forming embryo block

The purpose of forming is to make a certain shape and size of the embryo block, and have a certain density and hardness. Many powder metallurgy products are directly formed into the final size and shape in one time. The forming methods are basically divided into pressure forming and non-pressure forming. The most widely used compression molding is molding.

4. Sintering of billets

Sintering is a key process in powder metallurgy process. The formed compacts are sintered to obtain the required final physical and mechanical properties. Sintering can be divided into unit system sintering and multiple system sintering. For solid state sintering of unit system and multiple system, the sintering temperature is lower than the melting point of the metal and alloy used; For liquid phase sintering of multicomponent system, the sintering temperature is generally lower than the melting point of refractory components, but higher than the melting point of fusible components. In addition to ordinary sintering, there are also special sintering processes such as loose packing sintering, melt leaching method and hot pressing method.

5. Post-treatment of powder metallurgy products

The treatment after sintering can be carried out in various ways according to different product requirements. Such as finishing, oiling, machining, heat treatment and electroplating.

To sum up, the production process of powder metallurgy has been told to you. If you need to know more about it, please pay attention to the official website of zhongwei Precision.