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State whether the following is true or false.
Silicon nitride sinters readily without any additives.

  • A.False only at small scales
  • B.True
  • C.False
  • D.True only at large scales

Answer: C

Covalent bonding makes diffusion very slow, so sintering aids that form a liquid phase are normally required. Those additives leave a boundary phase that limits high-temperature performance, which is the standing compromise for the material.

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