扁平なCo相を有する超微粒超硬合金の特性 Mechanical Properties of Ultra-fine Grained Cemented Carbides with Flattened Co Phase

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Mechanical properties of ultra-fine grained cemented carbides with 12wt% Co binder produced by pulsed-electric current sintering were compared with those of cemented carbides by conventional vacuum sintering. The cemented carbides prepared by pulsed-electric current sintering had 6% higher hardness and 23% higher fracture toughness. These excellent properties seemed to be caused by ultra-fine WC grains and flattened Co phase in the sintered compacts. The flattened Co phase tended to be arranged in a perpendicular direction against a pressurized direction during sintering. However the increasing effect of fracture toughness by the flattened Co became small according to decreasing of Co contents. The fracture toughness of the compacts with Co binder less than 2wt% Co sintered by pulsed-electric current process was about 8% smaller than that by conventional process. But the hardness was about 20% higher than that by conventional process. The transverse rapture strength of ultra-fine grained cemented carbides sintered by pulsed-electric current process was about 28% smaller than that by conventional process.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 53(10), 809-814, 2006-10-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10018326712
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    8559775
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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