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Ball milling time cannot be extended indefinitely to reach ever finer powders because

  • A.the mill would eventually run right out of its grinding media
  • B.the powder would gradually change its chemical formula
  • C.no mill is able to operate for longer than about an hour
  • D.a limiting size is reached where fracture and welding balance

Answer: D

As particles get finer they deform rather than fracture, and cold welding begins to rebuild them. Contamination also accumulates with time, so extended milling eventually costs more than it gains. Milling time is optimised rather than simply extended.

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