• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2022, Vol. 58 ›› Issue (4): 80-93.doi: 10.3901/JME.2022.04.080

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Research Progress of Brazing Diamond and Application of Tools

MAO Yamei1, HEI Hongjun1, GAO Jie1,2, ZHENG Ke1, YU Shengwang1, WANG Yao1   

  1. 1. Institute of New Carbon Materials, Taiyuan University of Technology, Taiyuan 030024;
    2. National Key Laboratory of Science and Technology on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054
  • Received:2021-03-25 Revised:2021-08-25 Online:2022-02-20 Published:2022-04-30

Abstract: The existing methods of brazing diamond cannot avoid diamond graphitization and high temperature thermal damage, so the wettability between diamond and brazing alloy interface, brazing mechanism and brazing method of diamond were discussed. The main factors affecting the performance of brazing diamond were analyzed comprehensively, and achievements in the single-layer and multi-layer brazing diamond tools at home and abroad were summarized. The influences of alloy composition, brazing temperature, holding time, brazing atmosphere and surface metallization on the properties of brazing diamond were discussed in detail. These factors not only effect interface interaction between brazing alloy and diamond (including interface wetting, interface chemical reaction, interface microstructure, thermal damage of diamond, etc.) but also cause residual thermal stress and impact the quality of the brazing joint. For instances, the compounds formed by reaction between active elements and diamond was a key to high bonding strength between diamond and matrix. Appropriate brazing temperature and holding time could not only enhance the interfacial bonding strength, depress interfacial residual thermal stress, but also reduce the formation of microscopic pores, porosity and other interface defects. Using a vacuum environment or protective atmosphere could reduce the oxidation and graphitization of diamond. The development direction and problems that need to be solved in the future were forecasted combining the current development status of brazing diamond tools and the actual needs of social production.

Key words: diamond, wettability, brazing method, brazing alloy

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