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Lubricant is applied to the die wall in pressing chiefly to

  • A.increase the density gradient deliberately
  • B.make the compact adhere to the punch
  • C.raise the temperature during pressing
  • D.reduce friction and ease ejection

Answer: D

Lower wall friction means a smaller density gradient and less force needed to eject the part. Excess lubricant, however, can weaken the green body and leave residue that must burn out cleanly. Lubricant type is chosen for its burnout behaviour as well as its slipperiness.

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