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Densification during sintering requires a transport mechanism that

  • A.evaporates material and then redeposits it nearby
  • B.leaves the centres of the particles quite unchanged
  • C.moves material from the grain boundary to the pore
  • D.moves the material only along the outer surfaces

Answer: C

Grain boundary and lattice diffusion from the boundary allow the particle centres to approach, which is what closes the pore. Surface diffusion and evaporation-condensation coarsen the neck without bringing the centres any closer.

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