Microstructure and strength of the Cf/SiC composite joint brazed with Co-Nb-Pd-Ni-V filler alloy

被引：0
|
作者：
Li W. [1 ]
Xiong H. [1 ]
Wu X. [1 ]
Chen B. [1 ]
机构：
[1] Welding and Plastic Forming Division, Beijing Institute of Aeronautical Materials, Beijing
来源：
Hanjie Xuebao/Transactions of the China Welding Institution | 2019年 / 40卷 / 09期
关键词：
Brazing; C[!sub]f[!/sub]/SiC composite; Interfacial reaction; Joint strength; Microstructure;
D O I：
10.12073/j.hjxb.2019400248
中图分类号：
学科分类号：
摘要：
The Cf/SiC composite joint was brazed with newly-designed Co-Nb-Pd-Ni-V filler alloy at the brazing temperature from 1 200℃ to 1 320℃, and the brazing time was fixed at 10 min. The results showed that elements V and Nb in filler alloy played active roles in the interfacial reactions during the brazing procedure, and two interfacial reaction layers VC and NbC were formed at the Cf/SiC surface. Under the brazing condition of 1 280℃/-10 min, the joint microstructure can be characterized as (VC/NbC) double layers/ (Co, Ni)2Si + CoSi + NbC + Pd2Si/ (NbC/VC) double layers. The optimum joint strength can be achieved brazed at 1 280℃ for 10 min, and the room-temperature bend strength was 61.0 MPa. Furthermore, the joint strength tested at 900 and 1 000℃ was even elevated to 83.2 and 87.7 MPa, respectively. The good high-temperature joint strength can be attributed to the formation of high-melting-point compounds, such as NbC and Pd2Si. © 2019, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.
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页码：128 / 132
页数：4
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