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Depression Effects of Al on Oxidation of Diamond During Sintering of Diamond/Borosilicate Glass Composites

Authors

  • Xianghong Zhang,

    1. State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao, Hebei 066004, People's Republic of China
    2. Hebei Vocational & Technical College of Building Materials, Qinhuangdao, Hebei 066004, People's Republic of China
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  • Yanhui Wang,

    1. State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao, Hebei 066004, People's Republic of China
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  • Jianbing Zang,

    Corresponding author
    1. State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao, Hebei 066004, People's Republic of China
      *diamondzjb@163.com
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  • Xiaozhe Cheng,

    1. State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao, Hebei 066004, People's Republic of China
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  • Xipeng Xu,

    1. Key Research Lab for Stone Machining, Huaqiao University, Quanzhou, Fujian 362021, People's Republic of China
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  • Jing Lu

    1. Key Research Lab for Stone Machining, Huaqiao University, Quanzhou, Fujian 362021, People's Republic of China
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  • This work was supported by the National Natural Science Foundation of China (No. 50972125 and 50872119), Natural Science Foundation of Hebei Province (No. E2010001187), and Element Six Ltd.

*diamondzjb@163.com

Abstract

Oxidization of diamond in the sintering process of diamond/glass composites results in uncontrolled expansion with many irregular pores and low bending strength of the tools. In this paper, Al powder was used as oxygen getter due to its excellent affinity with oxygen. Its oxidization product, Al2O3, entered into glass network. Consequently, oxidization of the grits was inhibited, and the wettability of diamond grits by the matrix improved. As a result, the expansion phenomenon was inhibited and the bending strength improved for all the composites. The minimum volume expansion rate and maximum bending strength were obtained for the composite with 4 wt% Al powder. This Al content resulted in a decrease of volume expansion rate from 175.2% to −10.9%, and an increase in bending strength from 11.3 to 75.1 MPa compared with the composite without Al powder.

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