高純度cBN多結晶体の微細構造と特性  [in Japanese] Microstructure and Properties of High-purity Polycrystalline cBN  [in Japanese]

Access this Article

Search this Article

Author(s)

Abstract

Microstructural features and some properties of high-purity polycrystalline cBN synthesized from hBN by the direct conversion method were investigated. A fine-grained (<0.5μm) and homogeneous high-purity polycrystalline cBN was obtained at 7.7GPa and 2200-2400°C. At lower pressure and lower temperature than these conditions, compressed hBN remained in the polycrystalline sintered body. Some cBN grains became larger rapidly at higher temperature above 2400°C, and inhomogeneous microstructure was formed. The fine-grained and homogeneous polycrystalline cBN had higher hardness and TRS, compared with the coarse-grained and inhomogeneous polycrystalline cBN. The thermal conductivity of the polycrystalline cBN increased with increasing grain size or synthesis temperature. The thermal conductivity of the fine-grained polycrystalline cBN, however, was 3 to 4 times higher than conventional cBN compacts containing binder materials. The fine-grained and homogeneous high-purity cBN is expected to have high potential in cutting tool applications because of its excellent mechanical and thermal properties.

Journal

  • Journal of the Japan Society of Powder and Powder Metallurgy

    Journal of the Japan Society of Powder and Powder Metallurgy 49(4), 327-332, 2002-04-15

    Japan Society of Powder and Powder Metallurgy

References:  15

Codes

  • NII Article ID (NAID)
    10008222662
  • NII NACSIS-CAT ID (NCID)
    AN00222724
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    05328799
  • NDL Article ID
    6146309
  • NDL Source Classification
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL Call No.
    Z17-274
  • Data Source
    CJP  NDL  J-STAGE 
Page Top