A Breakthrough for Processing of Net-shaped PM Parts using Nanopowders (特集 多様化する粉体成形の新しい展開) A Breakthrough for Processing of Net-shaped PM Parts using Nanopowders

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This paper reviews our recent investigations for finding a breakthrough for processing of net-shaped powder metallurgical parts using nanopowders. Especially, the issues on low-temperature powder injection molding of the Fe nanopowder- and micro-nano powder feedstock using a low melting binder are introduced. Relating to consolidation of the nanopowders by pressureless sintering, understanding nanopowder agglomerate sintering (NAS) process is essential to processing of net-shaped nanopowder materials and components. Based upon this concept, we have suggested a new idea of full density processing for fabricating micro-powder injection molded part using metal nanopowder agglomerates produced by hydrogen reduction of metal oxide powders. The debound (brown) part maintained uniform and sound surface structure due to strong networks between the micropowders by enhanced sintering effect of nanopowders during the debinding process. During sintering the PIM gear underwent isotropic shrinkage to reach full density while the micropowder grains rarely grew due to the inhibition effect of the nanopowders on the migration of micropowder grain boundaries. Conclusively, the use of micro-nano powder feedstock might provide a potential application for processing the PIM parts with full density and fine microstructure.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 58(11), 663-672, 2011-11-15

    一般社団法人 粉体粉末冶金協会

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各種コード

  • NII論文ID(NAID)
    10030479446
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    ENG
  • 資料種別
    REV
  • ISSN
    05328799
  • NDL 記事登録ID
    023350068
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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