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The principal reason a pressed compact must have uniform green density is that

  • A.differential shrinkage during firing distorts the part
  • B.the binder will otherwise not burn out at all cleanly
  • C.the compact cannot then be ejected from the die at all
  • D.the powder would otherwise not flow into the die cavity

Answer: A

Denser regions shrink less than looser ones, so the fired part warps or cracks along the boundary between them. Uniformity in the press is therefore a condition for dimensional accuracy after firing. Uniformity in the press is cheaper than correction afterwards.

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