Metal Casting Processes:
Powder Metallurgy

Cold Die Pressing and Sintering

The powder is blended with a lubricant and fed into dies, pressed into shape, sintered in a controlled atmosphere and occasionally coined or repressed to achieve fine detail and dimensional precision.

Hot Die Pressing

Hot die pressing is similar to cold die pressing except that no lubricant is needed and the sintering occurs during the pressing, which is at an elevated temperature. This method offers better compaction, ductility and strength than cold pressing and sintering and it may be used to improve the soundness of castings.

Powder Injection Molding

In this process the powders are mixed with a binder, forming granular pellets which are heated to molding temperature and injected into a mold cavity. The part is then cooled and removed from the mold after which it is processed, sintered and, if necessary, undergoes secondary operations.



This material is based upon work supported by the National Science Foundation under Grant No. 0633602. Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF).


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