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Silicon nitride is used for engine components and bearings because it combines

  • A.a plasticity that allows it to be readily extruded
  • B.strength at temperature with good thermal shock resistance
  • C.the very lowest cost of any technical ceramic available
  • D.electrical conductivity together with a very high density

Answer: B

Its low thermal expansion gives it unusual tolerance of rapid temperature change, and it keeps its strength where metals soften. The difficulty is that it does not sinter readily and needs additives or applied pressure.

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