遠心噴霧急冷凝固粉の収率に及ぼす要因

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  • Optimum Producing Conditions of Rapidly Solidified Powder Using Centrifugal Atomization Method.
  • エンシン フンム キュウレイ ギョウコ フン ノ シュウリツ ニ オヨボス ヨ

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In the centrifugal atomization method, a mass ratio of rapidly solidified prealloy powder to raw material, i.e. a yield rate is remarkably affected by various producing conditions. In order to get the high yield rate, it is very important that a wettability between the rotating disk and the molten metal is superior and that a formation of exces-sive deposited layer on the disk is prevented. The effects of rotating speed of disk and ejecting position of molten metal from the disk center on the formation morphology of the deposited layer have been investigated in the production of rapidly solidified Al-base prealloy powder. The following results are obtained. Though the formation morphology is little affected by the rotating speed of disk, it is significantly influenced by the ejecting position. Deviating the ejecting position from the disk center is effective in preventing the formation of excessive deposited layer. The authors have stably accomplished more than 80 % yield rate of Al-l OMg-0.8Zr prealloy powder using the Mo thin sheet disk.

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