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Excessively fine particles in a powder can be a disadvantage because they

  • A.agglomerate strongly and are difficult to disperse
  • B.sinter a great deal more slowly than coarse particles
  • C.cannot be measured at all by any available technique
  • D.increase the melting point of the finished ceramic

Answer: A

Surface forces dominate as size falls, so submicron powders clump together and resist wetting. The sintering advantage of fineness is only realised if the dispersion problem is solved first. Fine and badly dispersed is worse than moderately fine and well dispersed.

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