Study of Copper-based Composite Brazing Process of SiCf/SiC Composites with Cobalt-based High Temperature Alloys

doi:10.3901/JME.2025.11.437

Abstract

Abstract: For the problems of high stress and difficult-to-control interface reaction in the joining of SiC_f/SiC composites and cobalt-based high-temperature alloys, CuTi+NbB₂ composite brazing material is prepared and the effects of Ti content and NbB₂ content on the interface microstructure and mechanical properties of the joints are investigated, and the successful joining of SiC_f/SiC composites and cobalt-based high-temperature alloys is finally realized. The typical microstructure of the joint is GH5188/Cu+(Co, Ni, Cu)Ti₂+TiC_0.5/Cu+(Ni, Co, Cu)Ti+(Co, Ni, Cu)TiSi+TiC_0.5/TiC_0.5+Cr₂C₃/SiC+Cu/SiC_f/SiC. With the increase of the Ti content, the reaction of the base material is intensified, and the main products at the interface are transformed from carbides to Si-Ti-Ni ternary phase. With the increase of NbB₂ content, the thickness of metal-side brazing area is also significantly reduced, while the thickness of ceramic-side brazing area had a significant increase, and the product gradually transformed from CoTi₂ to CoTi(Si) phase. NbB₂ as the nucleation point made the distribution of reactive phases in the braze seam is more uniform rather than enriched in the interface; meanwhile, the finite element results also showed that its presence can effectively reduce the residual stress of the joints. The optimum joint strength is obtained at 1 050 ℃/10 min with 0.1 wt% NbB₂, reaching a value of 72 MPa, which is 1.2 times stronger than that without NbB₂. The ceramic side fracture is divided into two main regions: the seam region and the TiC_0.5 and Cu-C reaction layer. The composite copper-based brazing material is designed by adding ceramic particle reinforcement, and thus the reliable joining between SiC_f/SiC composites and cobalt-based high-temperature alloys is realized for the first time and the related mechanism is clarified, which provided a theoretical basis for the development and manufacture of the subsequent aero-engine hot-end components.

Key words: continuous fiber reinforced silicon carbide, cobalt-based high-temperature alloys, vacuum brazing, interfacial microstructure, mechanical properties

CLC Number:

TB33
TG454

YANG Jia, ZHANG Shouzhuang, LU Xuan, XU Xin, WANG Ce, LIN Panpan, MEI Han, LIU Yue, HE Peng, LIN Tiesong. Study of Copper-based Composite Brazing Process of SiC_f/SiC Composites with Cobalt-based High Temperature Alloys[J]. Journal of Mechanical Engineering, 2025, 61(21): 437-445.

References

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Study of Copper-based Composite Brazing Process of SiC_f/SiC Composites with Cobalt-based High Temperature Alloys

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