Microstructure design of C/C composites through electrochemical corrosion for brazing to Nb

Jin Ba ¹Xu Ji ¹Bin Wang ¹Peixin Li ¹Jinghuang Lin ¹Jian Cao ¹Junlei Qi¹

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作者信息

1. State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China
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Abstract

Surface structure of C/C composites has been regulated through electrochemical corrosion at room tem-perature to modify the residual stress and improve the joining strength when brazed to Nb.The unique crevice corrosion in C/C composites is investigated to reveal the change of corrosion depth and fiber size.The interlacing zone of carbon fiber reinforced brazing alloy replaces the reaction layer in the original joint.Joining area is increased dramatically and the continuous crack will be hindered.The interlacing zone eliminates the stress concentration and relieves the residual stress through reducing the property mismatch.All advantages contribute to the joining quality of C/C-Nb.Shear strength of C/C-Nb joint with 80 μm depth reached 37.7 MPa,which was 1.2 times higher than that of original joint.Surface structure design of C/C composites not only expands the application in structure component,but also exhibits the promising application in energy field.

Key words

Thermal corrosion/Electrochemical corrosion/C/SiC composites/Braze

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基金项目

National Natural Science Foundation of China(51575135)

National Natural Science Foundation of China(51622503)

National Natural Science Foundation of China(U1537206)

National Natural Science Foundation of China(51621091)

Natural Science Foundation of Heilongjiang Province of China(YQ2019E023)

出版年

2022

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量29

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