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Can high-energy ball mills achieve pressurized vacuum?

BNNTs were typically synthesized by the prolonged approximately 150 h highenergy milling of pure boron or hBN powder using stainlesssteel milling vessels and hardened steel balls in a pressurized 23 10 3 Torr NH 3 atmosphere The milled material was then annealed at high temperature 1000 C in an N 2 atmosphere for 10 h It was found that large quantities of BNNTs can be

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