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Cr/Al/B/diamond体系中金刚石表面的热爆反应涂层

韩警贤 刘嘉霖

韩警贤, 刘嘉霖. Cr/Al/B/diamond体系中金刚石表面的热爆反应涂层[J]. 金刚石与磨料磨具工程, 2022, 42(6): 692-698. doi: 10.13394/j.cnki.jgszz.2022.0059
引用本文: 韩警贤, 刘嘉霖. Cr/Al/B/diamond体系中金刚石表面的热爆反应涂层[J]. 金刚石与磨料磨具工程, 2022, 42(6): 692-698. doi: 10.13394/j.cnki.jgszz.2022.0059
HAN Jingxian, LIU Jialin. Thermal explosion reaction coating on diamond surface of Cr/Al/B/diamond system[J]. Diamond & Abrasives Engineering, 2022, 42(6): 692-698. doi: 10.13394/j.cnki.jgszz.2022.0059
Citation: HAN Jingxian, LIU Jialin. Thermal explosion reaction coating on diamond surface of Cr/Al/B/diamond system[J]. Diamond & Abrasives Engineering, 2022, 42(6): 692-698. doi: 10.13394/j.cnki.jgszz.2022.0059

Cr/Al/B/diamond体系中金刚石表面的热爆反应涂层

doi: 10.13394/j.cnki.jgszz.2022.0059
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:

    韩警贤,女,1988年生,硕士研究生、助教。主要研究方向:先进陶瓷制备及表征。E-mail:miliai2017@126.com

  • 中图分类号: TQ164

Thermal explosion reaction coating on diamond surface of Cr/Al/B/diamond system

  • 摘要: 采用Cr/Al/B/diamond粉体为原料,并添加少量Cr2O3或B2O3以诱发热爆反应。结果表明:在高纯Ar保护下,热爆反应后的试样粉末化严重,易将结合剂与金刚石颗粒分离。添加Cr2O3的原料体系发生热爆反应后,结合剂中的主相为Cr2AlB2,金刚石表面会形成含Cr3C2和Al的复合涂层,涂层的晶粒大小为0.5~7.0 µm。当金刚石质量分数为10%和20%时,试样中的金刚石颗粒表面涂覆良好,其起始和终止氧化温度都显著高于未涂覆金刚石的;而在金刚石质量分数较高时,其表面涂覆效果略差。添加B2O3的原料体系发生热爆反应后,金刚石表面的涂覆效果不佳,只有半数或以下数量的金刚石颗粒被涂覆。

     

  • 图  1  热爆试样的外观

    Figure  1.  Appearances of thermal explosion samples

    图  2  分离的金刚石颗粒的外观

    Figure  2.  Appearances of separated diamond particles

    (a)10% (b)20% (c) 30% (d)40%

    图  3  热爆试样中结合剂粉末的XRD图谱

    Figure  3.  XRD patterns of binder powders in thermal explosion reaction samples

    图  4  金刚石原料和分离的金刚石颗粒的XRD图谱

    Figure  4.  XRD patterns of diamond raw material and separated diamond particles

    图  5  分离的金刚石颗粒表面典型的SEM形貌

    Figure  5.  Typical SEM morphology of separated diamond particle surface

    图  6  图5b中金刚石颗粒表面框选区域的EDS结果

    Figure  6.  EDS results of framed area on the surface of diamond particle in Fig. 5b

    图  7  分离的金刚石颗粒的外观

    Figure  7.  Appearances of separated diamond particles

    图  8  热爆试样中结合剂粉末的XRD图谱

    Figure  8.  XRD patterns of binder powders in thermal explosion reaction samples

    图  9  分离的金刚石颗粒的XRD图谱

    Figure  9.  XRD patterns of separated diamond particles

    图  10  Cr/Al/B/Diamond体系中形成的碳化物吉布斯自由能变随温度的变化

    Figure  10.  Changes of Gibbs free energy of carbides formed in Cr/Al/B/Diamond system with temperatures

    图  11  金刚石颗粒的热重曲线

    Figure  11.  TG curves of diamond particles

    表  1  Cr/Al/B结合剂中可能发生的化学反应焓变值

    Table  1.   Enthalpy changes of possible chemical reactions in Cr/Al/B binder

    化学反应方程式 焓变值 △H / (kJ·mol−1)
    Cr + B = CrB −75.31
    Cr + 2B = CrB2 −94.14
    2Cr + 2B = Cr2B −38.53
    2Cr + Al = Cr2Al −10.86
    5Cr + 8Al = Cr5Al8 −17.67
    Al + 2B = AlB2 −65.35
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-04-28
  • 修回日期:  2022-07-06
  • 刊出日期:  2023-01-12

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