Brazing of C/C composites and 304 stainless steels via Ni/Mo composite interlayer

Abstract

In order to improve the strength of C/C composites and 304 SS brazed joint, two substrates were brazed by adding metal interlayers (Ni, Mo, Ni/Mo) to BNi-2 or AgCuTi filler metals. The objective of this study was to investigate the microstructure, joint mechanism, and mechanical properties of the brazed joints. The findings revealed that the microstructure of the BNi-2+Ni/Mo joint consisted of Cr₃C₂, Ni(s, s), Cr_xNi_y+MoNi₄, Mo, MoNi₄+Cr_xM_y, and Ni(s, s) + Cr-Fe. The interfacial microstructure of the AgCuTi+Ni/Mo joint in the control experiment consisted of TiC, Ag(s, s) + Cu(s, s), Ni, Ag(s, s)+Cu(s, s)+MoTi, Mo, and MoTi+Cu(s, s)+Ag(s, s). Finite element simulations demonstrated that the Ni/Mo composite interlayer effectively alleviated residual stresses in the C/C substrates. The average shear strength of the BNi-2+Ni/Mo brazed joints at room temperature was found to be 2.57 MPa, while the average shear strength of the AgCuTi+Ni, Mo, and Ni/Mo joints were 10.91 MPa, 23.81 MPa, and 26.77 MPa, respectively.

Keywords

C/C composites / 304 stainless steel / vacuum brazing / composite interlayer / finite element analysis

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