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Chinese Journal of High Pressure Physics  > 2004  >  18(3): 252-260 .
DENG Fu-Ming, ZHAO Guo-Gang, WANG Zhen-Ting, GUO Gang, LIU Xiao-Hui, CHEN Qi-Wu. Theoretical Study on High Pressure Liquid Sintering of Polycrystalline Diamond Compact[J]. Chinese Journal of High Pressure Physics, 2004, 18(3): 252-260 . doi: 10.11858/gywlxb.2004.03.010
Citation: DENG Fu-Ming, ZHAO Guo-Gang, WANG Zhen-Ting, GUO Gang, LIU Xiao-Hui, CHEN Qi-Wu. Theoretical Study on High Pressure Liquid Sintering of Polycrystalline Diamond Compact[J]. Chinese Journal of High Pressure Physics, 2004, 18(3): 252-260 . doi: 10.11858/gywlxb.2004.03.010
shu

Theoretical Study on High Pressure Liquid Sintering of Polycrystalline Diamond Compact

doi: 10.11858/gywlxb.2004.03.010
  • 1.

    Department of Materials Science and Engineering, China University of Mining and Technology (Beijing Campus), Beijing 100083, China;

  • 2.

    Heilongjiang Institute of Science and Technology, Harbin 150027, China

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  • Corresponding author: DENG Fu-Ming
  • Received Date: 15 Oct 2003
  • Rev Recd Date: 13 Jan 2004
  • Publish Date: 05 Sep 2004
    Abstract
  • Based on the theoretical analysis of the interaction between diamond and melted cobalt under HP/HT conditions, the effect of temperature and carbon content of the melted cobalt on the sintering process of diamond dissolution and polycrystalline diamond growth are discussed. It is suggested that the diamond is preferable to graphite to dissolve in the melted cobalt under HP/HT and there are three sintering mechanisms in the diamond-cobalt sintering system, that is, the mechanism of diamond rearrangement, dissolution and precipitation and formation of the direct bonding of diamond to diamond. The melted cobalt with different carbon content and temperature can play an important role to weak or cease the covalent bond of diamond at its surfaces, to promote the rearrangement of diamond, to realize the transportation of diamond atoms and finally to form the diamond to diamond bonding structure of polycrystalline diamond. According to the high pressure liquid sintering theory of diamond proposed in this paper, some experimental phenomena found during the HP/HT sintering process of polycrystalline diamond compacts could be explained rationally.

     

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