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

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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Acknowledgment

This research work is sponsored by the National Natural Science Foundation of China (Contract Nos. 59905022 and 50475160).

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Correspondence to Hua-Ping Xiong.

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Xiong, HP., Mao, W., Xie, YH. et al. Control of interfacial reactions and strength of the SiC/SiC joints brazed with newly-developed Co-based brazing alloy. Journal of Materials Research 22, 2727–2736 (2007). https://doi.org/10.1557/JMR.2007.0370

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