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Control of interfacial reactions and strength of the SiC/SiC joints brazed with newly-developed Co-based brazing alloy

Published online by Cambridge University Press:  31 January 2011


Hua-Ping Xiong
Affiliation:
Laboratory of Welding and Forging, Beijing Institute of Aeronautical Materials, Beijing 100095, People’s Republic of China
Wei Mao
Affiliation:
Laboratory of Welding and Forging, Beijing Institute of Aeronautical Materials, Beijing 100095, People’s Republic of China
Yong-Hui Xie
Affiliation:
Laboratory of Welding and Forging, Beijing Institute of Aeronautical Materials, Beijing 100095, People’s Republic of China
Bo Chen
Affiliation:
Laboratory of Welding and Forging, Beijing Institute of Aeronautical Materials, Beijing 100095, People’s Republic of China
Wan-Lin Guo
Affiliation:
Laboratory of Welding and Forging, Beijing Institute of Aeronautical Materials, Beijing 100095, People’s Republic of China
Xiao-Hong Li
Affiliation:
Laboratory of Welding and Forging, Beijing Institute of Aeronautical Materials, Beijing 100095, People’s Republic of China
Yao-Yong Cheng
Affiliation:
Laboratory of Welding and Forging, Beijing Institute of Aeronautical Materials, Beijing 100095, People’s Republic of China
Corresponding
E-mail address:

Abstract

Co-based brazing alloy CoFeNi(Si, B)CrTi was designed for SiC joining. The periodic banded reaction structure that existed at the interface between SiC and the traditional Ni-based or Co-based braze has been eliminated by the new brazing alloy. The maximum room-temperature four-point bend strength of 161 MPa was achieved for SiC/SiC joint under the optimum brazing condition of brazing filler thickness of 120 μm, brazing temperature of 1150 °C, and brazing time of 10 min. The corresponding reaction layer of the SiC/SiC joint is composed of multilayer silicides and TiC band, and many small TiC particles are scattered throughout the matrix of the central part of the joint. The joints thus exhibit stable high-temperature strength. It is believed that the formation of TiC in the joint contributes not only to the elimination of the periodic banded reaction structure, but also to the high joint strength and the high-temperature stability.


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Copyright © Materials Research Society 2007

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Control of interfacial reactions and strength of the SiC/SiC joints brazed with newly-developed Co-based brazing alloy
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