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MIM
Metal Injection Molding

"green" part "brown" part sintered part

This technology combines the advantages of plastic injection molding (geometric design freedom) with the advantages offered by powder metallurgy (processing of demanding, hardly machinable or unmachinable, sometimes even uncastable, structural and functional materials). With this technology, it is possible to manufacture complicated, ready-for-installation metallic molded parts with greatest reproducibility and a wide variety of material properties in series.
This overview focuses on the technological chain spanning from feedstock (plastified powder comprising metallic powder and binding system), the "green" part and the "brown" part through to the sintered part.

Injection molded part with approx. 10 weight percent of binder.
Properties:
- High density,
- Homogeneous powder
  distribution,
- No alignment of powder
  particles.

These properties result in a symmetrical reduction and a higher component density, which is a prerequisite for gastight sintered parts.

With the dissolution of the first binding components, the so-called matrix, the green part transforms into the porous brown part that still has to be sintered.

The resulting component is free of binders and consolidated by way of sintering such that it is with close tolerances in terms of dimensions and ready for installation.
Properties:
- Observance of close
  tolerances,
- Density of 97% of the
  theoretical density,
- Round, separate, yet
  uniformly distributed
  micropores
- No cracking as a result of
  micropores.

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