More Reasons Why PM is Important
Certain metals that are difficult to fabricate by other methods can be shaped by
powder metallurgy
◦ Tungsten filaments for incandescent lamp bulbs are made by PM
Certain alloy combinations and cermets made by PM cannot be produced in other
ways
PM compares favorably to most casting processes in dimensional control
PM production methods can be automated for economical production
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Limitations and Disadvantages
High tooling and equipment costs
Metallic powders are expensive
Problems in storing and handling metal powders
◦ Degradation over time, fire hazards with certain metals
Limitations on part geometry because metal powders do not readily flow laterally in
the die during pressing
Variations in density throughout part may be a problem, especially for complex
geometries