TiB2-TiC-SiC复合陶瓷接触反应钎焊接头界面组织及力学性能

doi:10.7527/S1000-6893.2021.25006

Abstract

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:

V250.1

CAI Xiaoqiang, WANG Dongpo, WANG Ying, YANG Zhenwen. Interfacial microstructure and mechanical properties of TiB₂-TiC-SiC ceramics joints fabricated by contact reactive brazing technique[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(2): 625006-625006.

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

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

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