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Machining damage to a fired ceramic is significant because it

  • A.increases the density of the component
  • B.removes all the internal porosity present
  • C.introduces surface flaws that reduce strength
  • D.changes the chemical composition of the surface

Answer: C

Grinding leaves cracks below the machined surface, and these become the strength-limiting flaws. Lapping, polishing or a light anneal are used to reduce their severity where strength matters. Machining allowance is planned with the damage layer in mind.

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