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Sintering of a ceramic in an atmosphere that dissolves the pore gas is advantageous because

  • A.grain growth is prevented altogether and entirely
  • B.the gas can leave and the pore closes fully
  • C.the atmosphere reacts chemically to fill the pore
  • D.the ceramic then melts a good deal more readily

Answer: B

Hydrogen and oxygen dissolve in some lattices and can diffuse out, so the pore is not held open by trapped gas. This is one route by which fully dense transparent ceramics are made. Sodium vapour lamp envelopes are the best known application.

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