Fabrication of c-BN Composites under Thermodynamically Metastable Condition of the c-BN by HIPing, UHPHIPing, and UHPHPing.

DOI Web Site 8 References
  • Yoshida H.
    National Institute for Advanced Interdisciplinary Research (NAIR)
  • Kume S.
    National Industrial Research Institute of Nagoya (NIRIN)
  • Suzuki K.
    National Industrial Research Institute of Nagoya (NIRIN)
  • Sakakibara S.
    National Industrial Research Institute of Nagoya (NIRIN)
  • Fuyuki T.
    Nisshin Flour Milling Co., Ltd., Technical Research Center
  • Fujii T.
    Nisshin Flour Milling Co., Ltd., Technical Research Center
  • Nishimura K.
    Nisshin Flour Milling Co., Ltd., Technical Research Center
  • Yamamoto M.
    Japan Ultra-high-Temperature Materials Research Center (JUTEM)
  • Nakagawa H.
    Japan Ultra-high-Temperature Materials Research Center (JUTEM)

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  • Fabrication of c-BN Composites under Th

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Abstract

The sintering behavior of cubic boron nitride (c-BN) composites and c-BN / ceramic whisker composites under conditions in which the c-BN is thermodynamically metastable were studied by HIPing, and by ultrahigh pressure hot isostatic pressing (UHPHIPing), and by ultrahigh pressure hot pressing (UHPHPing). The c-BN fine particles (particle size: 0.5-2μm) coated with TiN by a physical vapor deposition (PVD) method, was used. A high-purity alumina (α-Al2O3) powder produced by the ammonium-aluminum carbonate thermal decomposition process were used as bonding materials with a very small amount of magnesia and titania, and 0, 30 and 40vol% SiC whiskers were also added. The obtained c-BN composites including relatively large amount of c-BN, or c-BN and SiC whiskers, were fully compacted without forming h-BN. Some of them showed very high hardness that ranked with c-BN cutting tools.

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