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Basic Information

Similar to plastic injection molding, a molten polymer (called binder) plus ceramic or metal powder paste is injected into a mold. The part is removed when the polymer cools. The binder material is removed by either solvent extraction or controlled heating to above the volatilization temperatures. The volume (cubic inches) of the part is restricted to small components, and material properties such as yield strength are lowered.

This process is a recently developed alternative to conventional compaction methods of powders in powder metallurgy products.

Injection Molding can be thought of as a step in a more general powder metallurgy process consisting of four general steps:

1. Powder manufacture
2. Mixing or blending
3. Compacting or injection molding
4. Sintering