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The driving force for sintering is

  • A.the reduction of total surface free energy
  • B.the applied pressure from the kiln atmosphere
  • C.gravity acting on the powder compact
  • D.the chemical reaction between the particles

Answer: A

A powder has an enormous surface area and therefore a large surface energy, and the system lowers it by replacing solid-vapour surfaces with solid-solid boundaries. No applied force is needed for the process to proceed at all.

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