高密着性α-Al_2O_3膜被覆切削工具の開発 Development of High Adhesive α-Al_2O_3 Films Coated on Cemented Carbide Cutting Tools by CVD

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Cemented carbide cutting tools coated with a TiN layer, a MT-Ti(C, N) layer, a bonding layer and a α-A1<SUB>2</SUB>O<SUB>3</SUB> layer in subsequent process steps in a hot wall Chemical Vapor Deposition (CVD) reactor have been developed, whose lifetime was about twice as long as that of the ordinary K-A1<SUB>2</SUB>O<SUB>3</SUB> coated ones in cutting tests on a cast metal FC250 due to the improved adherence of α-A1<SUB>2</SUB>O<SUB>3</SUB> layer.<BR>The CVD coatings of the developed cutting tools have been investigated using X-ray diffraction, SEM, EPMA, TEM and TEM-EDX, and the following characterisTiCs were found:<BR>(1) The bonding layer grains consisted of Ti, C, N and O, or of Ti, C and O.<BR>(2) The crystal structure of the bonding layer phase were found to be face centered cubic with the latTiCe parameter of 0.431 nm.<BR>(3) The bonding layer grains grew epitaxially on the MT-Ti(C, N) layer grains.<BR>(4) No disorder of latTiCe fringes in some interfaces between the bonding layer grains and the α-Al<SUB>2</SUB>O<SUB>3</SUB> layer grains could be found.<BR>The facts (3) and (4) among these were considered to be the causes for the improved lifetime or adherence of the α-Al<SUB>2</SUB>O<SUB>3</SUB> layer.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 45(6), 561-565, 1998-06-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002052260
  • 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
    4502280
  • 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  CJP引用  NDL  J-STAGE 
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