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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (2): 625006-625006.doi: 10.7527/S1000-6893.2021.25006

• Special Topic of Advanced Aeronautical Materials Welding/Joining • Previous Articles     Next Articles

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)

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

CLC Number: