After having mixed fine metal powders and a thermoplastic
binder to form a pelletized molding compound, this mixture, called
"feedstock", is then injected into a mold cavity.
plastic binder is used only as a carrier to the metal powder in
order to obtain by injection the desired geometry: after injection,
the binder is no longer needed.
this reason, as-molded parts ("green" parts) are exposed to heat
in a special oven to remove most of the binder material. Afterwards,
the debound parts are sintered at high temperature in controlled
this step, the voids created by the plastic removal close in and
there is a shrinkage of approximately 20%.
parts shrink to nearly full density and the process is complete.
description of the process is shown in the above scheme:
- Metal powder
- Plastic binder
- Injection moulding
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