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金刚石表面的热爆反应合成涂层

孙长红 梁宝岩 张旺玺

孙长红, 梁宝岩, 张旺玺. 金刚石表面的热爆反应合成涂层[J]. 金刚石与磨料磨具工程, 2022, 42(1): 47-55. doi: 10.13394/j.cnki.jgszz.2021.0098
引用本文: 孙长红, 梁宝岩, 张旺玺. 金刚石表面的热爆反应合成涂层[J]. 金刚石与磨料磨具工程, 2022, 42(1): 47-55. doi: 10.13394/j.cnki.jgszz.2021.0098
SUN Changhong, LIANG Baoyan, ZHANG Wangxi. Thermal explosion reaction synthetic coating on diamond surface[J]. Diamond & Abrasives Engineering, 2022, 42(1): 47-55. doi: 10.13394/j.cnki.jgszz.2021.0098
Citation: SUN Changhong, LIANG Baoyan, ZHANG Wangxi. Thermal explosion reaction synthetic coating on diamond surface[J]. Diamond & Abrasives Engineering, 2022, 42(1): 47-55. doi: 10.13394/j.cnki.jgszz.2021.0098

金刚石表面的热爆反应合成涂层

doi: 10.13394/j.cnki.jgszz.2021.0098
基金项目: 国家自然科学基金(51864028);河南省科技攻关项目(212102210465)。
详细信息
    作者简介:

    孙长红,男,1992年生,助教。主要研究方向:超硬复合材料。E-mail: baoyanl@126.com

  • 中图分类号: TQ164

Thermal explosion reaction synthetic coating on diamond surface

  • 摘要: 以M(Mn或Cr)/Al/B/Diamond粉体为原料,通过热爆反应技术在金刚石表面生成多元复合涂层,并用X射线衍射仪、扫描电镜结合能谱仪研究2种原料体系及不同Al含量对陶瓷基体和涂层的物相组成和显微形貌的影响。结果表明:在N2的保护和引爆下,Cr/Al/B/Diamond粉体的热爆反应在金刚石表面形成CrB-AlN基多元复合涂层及Cr5Al8和Cr2AlB2等副产物;在Ar保护下,Mn/Al/B/Diamond粉体的热爆反应在金刚石表面形成Mn2AlB2基复合涂层。2种涂层对金刚石的包裹良好。2种热爆反应由于放热量较小,反应产物难以烧结成块体。制备出的疏松多孔块体易于粉碎和分离,从而可将陶瓷基体与金刚石颗粒分离。

     

  • 图  1  金刚石原料及Cr/Al/B/Diamond压坯热爆后分离的金刚石颗粒形貌

    Figure  1.  Morphology of diamond raw material particles and diamond particles separated after thermal explosion of Cr/Al/B/Diamond compacts

    图  2  Cr/Al/B/Diamond体系中的陶瓷基体及金刚石XRD图

    Figure  2.  XRD patterns of ceramic matrix and diamonds in Cr/Al/B/Diamond system

    图  3  Cr/Al/B/Diamond体系中的陶瓷基体SEM形貌

    Figure  3.  SEM morphologies of ceramic matrix in Cr/Al/B/Diamond system

    图  4  Cr/Al/B/Diamond体系中金刚石的SEM形貌

    Figure  4.  SEM morphologies of diamonds in Cr/Al/B/Diamond system

    图  5  Mn/Al/B/Diamond体系中的陶瓷基体和金刚石XRD图

    Figure  5.  XRD patterns of ceramic matrix and diamond in Mn/Al/B/Diamond system

    图  6  Mn/Al/B/Diamond体系中陶瓷基体粉体的典型SEM形貌

    Figure  6.  Typical SEM morphologies of ceramic matrix powder in Mn/Al/ B/Diamond system

    图  7  Mn/Al/B/Diamond体系中金刚石颗粒的形貌

    Figure  7.  Morphologies of diamond particle in Mn/Al/B/Diamond system

    图  8  金刚石颗粒表面研磨破损后的显微形貌

    Figure  8.  Micro morphology of diamond particle surface after grinding and damage

    图  9  x = 1时的混合粉末的差热分析结果

    Figure  9.  DSC results of mixed powder at x = 1

    图  10  Cr/Al/B/N2 和Mn/Al/B体系典型反应的吉布斯自由能随温度的变化

    Figure  10.  Variation of Gibbs free energy with temperatures for typical reactions of Cr/Al/B/N2 and Mn/Al/B systems

    表  1  M(Cr或Mn)/Al/B体系中重要反应的标准摩尔焓变值

    Table  1.   Standard molar enthalpy changes of important reactions in M(Cr or Mn)/Al/B system

    序号反应焓变值 ΔH / (kJ·mol−1)文献
    1Cr + B = CrB−75.3[18]
    2Cr + 2B = CrB2−94.1[18]
    32Cr + Al = Cr2Al−12.2[19]
    48Cr + 5Al = Cr8Al5−14.3[19]
    59Cr + 17Al = Cr9Al17−15.7[19]
    6Al + 2B = AlB2−66.9[18]
    7Mn + B = MnB−75.3[18]
    8Mn + 2B = MnB2−94.1[18]
    98Al + 5Mn = Al8Mn5−25.8[20]
    106Al + Mn = Al6Mn−15.6[20]
    114Al + Mn = Al4Mn−21.2[20]
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-09-18
  • 修回日期:  2022-01-04
  • 录用日期:  2021-12-07
  • 网络出版日期:  2022-03-17
  • 刊出日期:  2022-03-17

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