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A thermal barrier coating on a turbine blade

  • A.Is a metallic layer that conducts heat away
  • B.Replaces the need for cooling air
  • C.Prevents tip rubbing
  • D.Is a ceramic layer that insulates the metal from the gas

Answer: D

The ceramic has a very low conductivity, so a layer a fraction of a millimetre thick can drop the metal temperature by a hundred degrees or more. It supplements cooling rather than replacing it, and its adhesion is often what limits the blade's life.

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