Reaction sintering of polycrystalline cubic boron nitride at high pressure and temperature.

• Sumiya Hitoshi

  住友電気工業(株)伊丹研究所

• Tsuji Kazuo

  住友電気工業(株)伊丹研究所

• Yazu Shuji

  住友電気工業(株)伊丹研究所

Bibliographic Information

Other Title

• ｃＢＮ多結晶体の超高圧高温反応焼結
• cBN タケッショウタイ ノ チョウコウアツ コウオン ハンノウ ショウケツ

Abstract

Single phase sintered compact of cBN (polycrystalline cBN) may be prepared under high pressure and temperature (>5.2GPa, >1350°C) from hBN compact carrying a small amount of Mg₃BN₃ as a catalyst. This work investigated the influence of the amount of Mg₃BN₃ added to the hBN compact on the microstructure and the thermal conductivity of the prepared polycrystalline cBN. It was established that by controlling the amount of Mg₃BN₃ (-1.0mol%) it was possible to prepare polycrystalline cBN which had a high thermal conductivity, approximately 6W/cm°C at room temperature. In addition, it was found that a small amount of water diffused into the hBN compact containing Mg₃BN₃ would suppress abnormal growth of cBN particles. Thus, by adding 0.2wt% of water to the hBN compact containing 1.0mol% of Mg₃BN₃, a homogeneous cBN sintered compact having regular particles (5-8μm) and with high thermal conductivity (-7W/cm°C) could be consistently prepared.

Journal

• Journal of the Japan Society of Powder and Powder Metallurgy

  Journal of the Japan Society of Powder and Powder Metallurgy 36 (6), 752-755, 1989

  Japan Society of Powder and Powder Metallurgy

Keywords

• Materials Chemistry
• Metals and Alloys
• Industrial and Manufacturing Engineering
• Mechanical Engineering

Details

• CRID: 1390001206308751744
• NII Article ID: 130000813699
• NII Book ID: AN00222724
• DOI: 10.2497/jjspm.36.752
• ISSN: 18809014
• ISSN: 05328799
• NDL BIB ID: 3248039
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3248039
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed