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Fused rather than sintered alumina is produced by

  • A.melting the material in an electric arc furnace
  • B.grinding it for a very long time indeed in a mill
  • C.precipitating it out from a chemical solution
  • D.heating it gently to below its melting point

Answer: A

Melting and recrystallising gives large dense crystals that are harder and less porous than a sintered grain. Fused alumina is used for abrasives and for the coarse fraction of refractory mixes. Sintered grades are preferred where reactivity during firing matters.

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