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Increasing compaction pressure indefinitely is not useful because

  • A.density approaches a limit while defects increase
  • B.the powder eventually melts inside the closed die
  • C.the binder is driven right out of the compact
  • D.the die becomes permanently and badly magnetised

Answer: A

Green density rises steeply at first and then flattens, while stored elastic energy and the risk of lamination keep growing. The working pressure is chosen near the knee of that curve rather than at the capacity of the press.

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