Yun Zhao, Juping Tu, Liangxian Chen, Junjun Wei, Jinlong Liu, and Chengming Li, Toughness enhancement of single-crystal diamond by the homoepitaxial growth of periodic nitrogen-doped nano-multilayers, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 766-771. https://doi.org/10.1007/s12613-022-2497-1
Cite this article as:
Yun Zhao, Juping Tu, Liangxian Chen, Junjun Wei, Jinlong Liu, and Chengming Li, Toughness enhancement of single-crystal diamond by the homoepitaxial growth of periodic nitrogen-doped nano-multilayers, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 766-771. https://doi.org/10.1007/s12613-022-2497-1
Research Article

Toughness enhancement of single-crystal diamond by the homoepitaxial growth of periodic nitrogen-doped nano-multilayers

+ Author Affiliations
  • Corresponding authors:

    Jinlong Liu    E-mail: liujinlong@ustb.edu.cn

    Chengming Li    E-mail: chengmli@mater.ustb.edu.cn

  • Received: 25 February 2022Revised: 11 April 2022Accepted: 14 April 2022Available online: 15 April 2022
  • Periodic nitrogen-doped homoepitaxial nano-multilayers were grown by microwave plasma chemical vapor deposition. The residual time of gases (such as CH4 and N2) in the chamber was determined by optical emission spectroscopy to determine the nano-multilayer growth process, and thin, nanoscale nitrogen-doped layers were obtained. The highest toughness of 18.2 MPa∙m1/2 under a Young’s modulus of 1000 GPa is obtained when the single-layer thickness of periodic nitrogen-doped nano-multilayers is about 96 nm. The fracture toughness of periodic nitrogen-doped CVD layer is about 2.1 times that of the HPHT seed substrate. Alternating tensile and compressive stresses are derived from periodic nitrogen doping; hence, the fracture toughness is significantly improved. Single-crystal diamond with a high toughness demonstrates wide application prospects for high-pressure anvils and single-point diamond cutting tools.
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