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The final stage of sintering is distinguished by

  • A.the first formation of necks between particles
  • B.a continuous open pore network
  • C.the complete absence of any grain growth
  • D.isolated closed pores that shrink slowly

Answer: D

Once pores are isolated, gas trapped inside them resists further shrinkage and grain growth can carry them into grain interiors where they are almost impossible to remove. Reaching full density from here is the hardest part of the process.

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