J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (11): 1386-1391.DOI: 10.1016/j.jmst.2017.03.014

• Orginal Article • Previous Articles     Next Articles

Polycrystalline diamond compact with enhanced thermal stability

Liu Shiqiab, Han Leic, Zou Yongtaod, Zhu Pinwend, Liu Baochangabd*()   

  1. a College of Construction Engineering, Jilin University, Changchun, 130061, China
    b Key Lab of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resources, Changchun, 130061, China
    c Xi’an Research Institute of China Coal Technology & Engineering Group Corp., Xi’an, 710077, China;
    d State Key Laboratory of Superhard Materials, Jilin University, Changchun, 130021, China
  • Received:2016-04-29 Revised:2016-06-05 Accepted:2016-07-31 Online:2017-11-20 Published:2018-01-25
  • Contact: Liu Baochang
  • About author:

    1 These two authors contributed equally to this paper.

Abstract:

Polycrystalline diamond compacts (PDC), which are composed of diamond and WC/Co substrate, and synthesized at high pressure and high temperature (HPHT), are widely applied as the tooth of drilling bit. However, the thermal stability of PDC will be reduced when diamond transforms into graphite due to cobalt in PDC acting as a catalyst during the drilling work. In this study, a new three-layer structured PDC with enhanced thermal stability has been successfully synthesized at pressures of 5.5-7.0 GPa and temperatures of 1650-1750 °C. In this structure, the diamond-SiC composite acts as the working layer, and the diamond-SiC-Co composite and WC/Co cements are as the intermediate layer and substrate, respectively. It is found that the initial oxidizing temperature of the three-layered PDC is enhanced up to 820 °C, which is significantly higher than that (~780 °C) of the conventional PDC counterpart.

Key words: Polycrystallie diamond compacts, High pressure and high temperature, Thermal stability