航空学报 > 2022, Vol. 43 Issue (2): 625006-625006   doi: 10.7527/S1000-6893.2021.25006

TiB2-TiC-SiC复合陶瓷接触反应钎焊接头界面组织及力学性能

蔡小强, 王东坡, 王颖, 杨振文   

  1. 天津大学 天津市现代连接技术重点实验室, 天津 300072
  • 收稿日期:2020-11-23 修回日期:2020-12-21 发布日期:2021-02-08
  • 通讯作者: 杨振文 E-mail:tjuyangzhenwen@163.com,yangzw@tju.edu.cn
  • 基金资助:
    国家自然科学基金(52175357);天津市科技计划(19ZXJRGX00100)

Interfacial microstructure and mechanical properties of TiB2-TiC-SiC ceramics joints fabricated by contact reactive brazing technique

CAI Xiaoqiang, WANG Dongpo, WANG Ying, YANG Zhenwen   

  1. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China
  • Received:2020-11-23 Revised:2020-12-21 Published:2021-02-08
  • Supported by:
    National Natural Science Foundation of China (52175357); Science and Technology Program of Tianjin (19ZXJRGX00100)

摘要: 采用Ti-Ni中间层体系对TiB2-TiC-SiC (TTS)复合陶瓷进行了钎焊连接,研究不同的钎料成分和保温时间对接头界面组织和力学性能的影响。结果表明:钎料成分变化会引起界面反应机制由Ti与TTS复合陶瓷反应为主的过程向Ni与TTS复合陶瓷反应为主的过程转变。采用Ti-24at% Ni钎料钎焊TTS复合陶瓷时,界面反应主要发生在Ti与TTS复合陶瓷之间,反应产物主要为Ti与TiB2反应形成的TiB以及与SiC反应形成的TiC和Ti5Si3。采用Ti-83at% Ni钎料钎焊TTS复合陶瓷时,界面反应主要发生在Ni与TTS复合陶瓷之间,尤其是与SiC的反应,反应产物主要为Ni2Si和C。此外,保温时间显著影响TTS/Ti-24at% Ni/TTS接头的界面组织和力学性能。随着保温时间的延长,接头中连续的Ti2Ni化合物消失,形成大量的TiB和Ti5Si3。与此同时,TTS复合陶瓷侧界面反应层逐渐增厚。在钎焊温度为1 040℃,保温时间为30 min条件下,采用Ti-24at% Ni钎料钎焊TTS复合陶瓷获得的接头室温抗剪强度最大,达到168±10 MPa,高温(800℃)抗剪强度达到81±18 MPa。

关键词: 二硼化钛, 碳化钛, 碳化硅, 钎焊, 界面组织, 抗剪强度

Abstract: Ti-Ni brazing alloy is successfully used to braze the TiB2-TiC-SiC (TTS) composite ceramic. The influence of change in Ti-Ni brazing alloy composition and brazing time on the interface microstructure and mechanical properties of the joint is studied. The results show that the change of Ti-Ni brazing alloy composition caused the interface reaction to change from a process dominated by the reaction of Ti and TTS ceramic to a process dominated by the reaction of Ni and TTS ceramic. When TTS ceramic is brazed using Ti-24at%Ni brazing alloy, the interface reaction mainly occurred in Ti and TTS ceramic, and the reaction products were TiB2, TiC and Ti5Si3. When TTS ceramic is brazed using Ti-83at%Ni brazing alloy, the interface reaction, especially the reaction with SiC, mainly occurred in Ni and TTS composite ceramics, and the reaction products are mainly Ni2Si and C. With an increase in the brazing temperature, the continuous Ti2Ni layer in the brazing seam gradually disappeared, and is replaced by TiB and Ti5Si3. In addition, the thickness of the reaction layer increased with the increase of the brazing temperature. The maximum shear strength of the joint achieved at room temperature was 168±10 MPa when the TTS ceramic joint was brazed using Ti-24at%Ni brazing alloy at 1040℃ for 30 min, whereas it was 81±18 MPa when the joint is tested at 800℃.

Key words: titanium diboride, titanium carbide, silicon carbide, brazing, interfacial microstructure, shear strength

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