粉末冶金現象としてのダイヤモンド砥粒とボンドメタルの結合 The bonding of diamond grits and matrix metals as powder metallurgical phenomena

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In order to provide a strong bonding between diamonds and matrix, a typical matrix alloy contains copper and cobalt as base metals, and tin, chromium and titanium as additives. Copper has a high thermal conductivity to dissipate heat during grinding together with a low degree of lattice disregistry to diamond to provide bonding strength. Cobalt has rather high values of both modulus of elasticity and elastic limit, and a low coefficient of thermal expansion to be compatible to some extent with the high elastic properties and the low thermal expansion of diamonds during grinding. Those properties make the matrix hold diamond grit tightly. Tin reacts with diamonds to form rough surfaces leading to an increased mechanical bonding strength, while chromium and titanium react with diamonds to make carbide layers on the grits leading to a good bonding strength provided by a good wetting. In the presence of a liquid copper alloy, iron or cobalt forms a solid solution layer containing copper as a main solute on graphite surface. The formation of the layer is driven by a difference of chemical potential in the system. A similar layer formation is possible on diamond surface. The layer will provide tight holding of grits by matrix.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 45(8), 775-780, 1998-08-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002052655
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    REV
  • ISSN
    05328799
  • NDL 記事登録ID
    4540072
  • 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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