上海Advantages and disadvantages of ideal MIM injection molding powder and powder

At present, powder metallurgy has become very mature in China. As a very influential Dongmu Group in the powder metallurgy industry, it has developed for more than 60 years. As a * * * superior company of powder metallurgy, it has accumulated a lot of information about powder metallurgy technology, built an international * * * technology innovation platform and an international team, created * * * enterprise technology center, * * * post doctoral workstation, and CNAS * * * recognized laboratory, Dongmu has invested more than 5% of its turnover in R&D for ten consecutive years. By 2020, it has exceeded 8%, reaching 270 million yuan. It has won the second prize of the "* * * Technology Invention Award" twice, and has won 160 authorized inventions in total. It has presided over the formulation of 3 * * standards, 9 industry standards, 22 key core technologies leading the world, and 2 technologies breaking the blockade of the United States to provide technical support for the localization of 5G chips.

Dongmu Group acquired Shanghai Fuchi, which also has a very good technical knowledge in the MIM injection molding industry. At present, it has accumulated a lot of powder characteristics information required by the MIM injection molding process. There are some obvious conflicts in the powder characteristics required for MIM injection molding, for example, irregular particle shape will increase the strength of the formed billet after degreasing, but also reduce the bulk density, increase the mixture viscosity and reduce the sintering density. We prefer to get spherical powder because the bulk density is higher. When making MIM injection molding powder metallurgy products, special attention is paid to the high bulk density, because it makes the shrinkage change of the blank during sintering smaller and the hardness of the blank greater.

The advantages and disadvantages of MIM injection molding powder are as follows:

1. Specific particle size distribution is required, bulk density is high, and cost is low (because low cost coarse powder and high cost fine powder can be mixed to reduce cost)

2. No reunion

3. The particle shape is mainly spherical

4. In order to quickly sinter MIM injection molding blanks, the average particle size of MIM injection molding raw material powder is required to be about 20 microns

5. The particles are completely dense without internal control

6. Explosion and toxic hazard * * * small

7. The particle surface is clean to make its interaction with the binder more stable