What is the difference between PM and MIM

MIM injection molding?

Powder metallurgy injection molding was born in California, USA in 1973, referred to as MIM. It is a new type of powder metallurgy molding technology invented by combining plastic injection molding technology with the field of powder metallurgy.Powder metallurgy is close to the injection molding process with powder metallurgy technology, first the solid powder and organic binder mixing together, through 150 degrees high temperature heating plasticizing, injection mold cavity with injection molding equipment, again is solidified, then use the method of thermal decomposition of binder removal from the billet, the last as powder metallurgy, precision by sintering parts.
2, powder metallurgy pressing molding
Powder metallurgy compaction molding is to use powder to fill the mold by gravity, through the machine pressure extrusion molding.In practical industrial applications is the most widely used one, cold closed steel die pressing, cold isostatic pressure, hot isostatic pressure, temperature pressure are pressing molding.However, due to the only up and down two-way pressing, some complex structural parts can not be produced, or can only be made into blank.

Powder metallurgy?
1. Most refractory metals and their compounds, pseudo-alloys and porous materials can only be manufactured by powder metallurgy.
2, because the powder metallurgy pressing method can be pressed into the final size of the billet, without or little need for subsequent mechanical processing, it can greatly save metal, reduce product costs.When products are manufactured by powder metallurgy, the loss of the metal is only 1-5%, whereas it may be as high as 80% when produced by ordinary casting methods.
3. As the powder metallurgy process does not melt the material in the material production process, it is not afraid of mixing impurities brought by crucible and deoxidizer, etc., while sintering is generally carried out in the vacuum and reducing atmosphere, without fear of oxidation and without any pollution to the material, so it is possible to produce high-purity materials.
4. Powder metallurgy can ensure the correctness and uniformity of material composition ratio.
5, powder metallurgy pressing is suitable for the production of the same shape and a large number of products, especially gear and other high processing costs of products, powder metallurgy manufacturing can greatly reduce production costs.