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Density gradients in a die-pressed compact arise principally from

  • A.the powder having been ground much too finely
  • B.the binder burning out unevenly during firing
  • C.the die having been made of hardened tool steel
  • D.friction between the powder and the die wall

Answer: D

Pressure is absorbed by wall friction as it travels down the compact, so the region nearest the punch is denser. The effect grows with the depth-to-diameter ratio and is the main limit on what single-action pressing can do.

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