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A component to be hot isostatically pressed without a container must first be

  • A.sintered until its porosity is closed
  • B.machined precisely to its final dimensions
  • C.coated all over with an organic binder
  • D.cooled to well below room temperature first

Answer: A

Gas would simply enter open pores and apply no net pressure, so the surface must be sealed first. Components that are still porous are canned in metal instead, which is then removed after the cycle. Canning adds cost, so pre-sintering is preferred where it is possible.

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