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首页> 外文期刊>Materials Science and Engineering >Beneficial effects of B_4C addition on the microstructure and mechanical properties of SiC ceramic joints diffusion bonded with Ti_3SiC_2
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Beneficial effects of B_4C addition on the microstructure and mechanical properties of SiC ceramic joints diffusion bonded with Ti_3SiC_2

机译：添加B_4C对Ti_3SiC_2扩散结合SiC陶瓷接头组织和力学性能的有益影响。

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摘要

The interfacial microstructure and mechanical properties of SiC ceramic joints diffusion bonded via spark plasma sintering with a powder mixture of Ti3SiC2 and B4C were investigated. The content of B4C ranging from 0 to 20 wt% was added into Ti3SiC2. Microstructure analysis results indicated that B4C in-situ reacted with Ti(3)SiC(2)to form fine-sized TiB2, TiC, SiC, and carbon in the joint. The volume fraction of these reaction formed phases and coefficient of thermal expansion of the composite interlayer were calculated. The proper addition of B4C (5-15 wt%) was beneficial for the improvement of joint strength. The optimal amount of B4C addition was 7.5 wt %. The shear strength of the joint bonded with 7.5 wt% B4C addition reached 112.5 +/- 8.3 MPa, which was 53.9% higher than that bonded without B4C addition. Vickers hardness of the composite interlayer was enhanced with the B4C addition. Toughening mechanisms including delamination and kinking of Ti3SiC2, crack deflection, crack bridging, and crack branching were observed in the composite interlayers.
机译：研究了用Ti3SiC2和B4C的粉末混合物通过火花等离子体烧结扩散结合的SiC陶瓷接头的界面微观结构和力学性能。向Ti 3 SiC 2中添加0〜20重量％的B 4 C的含量。显微组织分析结果表明，B4C与Ti（3）SiC（2）原位反应，在接头中形成细小尺寸的TiB2，TiC，SiC和碳。计算这些反应形成相的体积分数和复合中间层的热膨胀系数。适当添加B 4 C（5-15重量％）对于提高接合强度是有益的。 B4C的最佳添加量为7.5重量％。加入7.5 wt％B4C的接头的剪切强度达到112.5 +/- 8.3 MPa，比未加入B4C的接头的剪切强度高53.9％。 B4C的添加提高了复合中间层的维氏硬度。在复合中间层中观察到了增韧机理，包括Ti3SiC2的分层和扭结，裂纹挠曲，裂纹桥接和裂纹分支。

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  • 来源
    《Materials Science and Engineering》 |2019年第10期|169-178|共10页
  • 作者

    Wang Zhiquan; Zhong Zhihong; Sun Bowen; Li Huaxin; Chen Chang; Song Kuijing; Wu Yucheng;

  • 作者单位

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China|Hefei Univ Technol, Natl Local Joint Engn Res Ctr Nonferrous Met & Pr, Hefei 230009, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China|Hefei Univ Technol, Natl Local Joint Engn Res Ctr Nonferrous Met & Pr, Hefei 230009, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China|Hefei Univ Technol, Natl Local Joint Engn Res Ctr Nonferrous Met & Pr, Hefei 230009, Anhui, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    SiC; Ti3SiC2; B4C; Diffusion bonding; Microstructure; Mechanical properties;

    机译：SiC;Ti3SiC2;B4C;扩散键合;显微组织;力学性能;

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