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The microstructure and mechanical performance of C/C-SiCf/SiC composite joints brazed by Si-10Zr eutectic alloy

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Abstract

The real-time wetting behavior of the Si-10Zr (at. %) eutectic alloy over the SiCf/SiC composites was investigated for the first time. The brazing of C/C composites and SiCf/SiC composites using the Si-10Zr filler alloy under a range of time was studied. The interfacial microstructure between the liquid alloy and the SiCf/SiC composites was determined. The joint microstructure, mechanical performance, and fractures of the C/C and C/C-SiCf/SiC joints were analyzed. The Si-Zr melt showed a contact angle of only 10° at 1480 ℃, owing to good wettability and abundant infiltration into the porous SiCf/SiC composites. With the extension of holding time, the Si-10Zr alloy reacted with the two substrates and formed SiC interfacial layers. An optimal fracture mode combined the Si-ZrSi2 filler, composites, and the SiC reaction layers.

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Acknowledgements

The financial support from the National Natural Science Foundation of China (No. 52205351) and the Project funded by the China Postdoctoral Science Foundation (No. 2022M710936) is highly appreciated.

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Authors and Affiliations

  1. School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin, China

    Zongjing He & Huining Xu

  2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, China

    Chun Li, Xiaoqing Si, Junlei Qi & Jian Cao

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  1. Zongjing He
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  2. Huining Xu
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  3. Chun Li
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  4. Xiaoqing Si
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  5. Junlei Qi
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Correspondence to Huining Xu.

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He, Z., Xu, H., Li, C. et al. The microstructure and mechanical performance of C/C-SiCf/SiC composite joints brazed by Si-10Zr eutectic alloy. Weld World 67, 525–531 (2023). https://doi.org/10.1007/s40194-022-01446-7

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  • DOI: https://doi.org/10.1007/s40194-022-01446-7

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