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<p>Reliable brazing of C/C-SiC composites to stainless steel is hindered by severe residual stresses and uncontrolled interfacial reactions. Here, we introduce a CuMnCr/Mo/Cu multilayer interface that aims to simultaneously regulates stress distribution and interfacial chemistry. Cr from the CuMnCr layer preferentially reacts with C/C-SiC, forming a Cr<sub>7</sub>C<sub>3</sub> + Cr<sub>3</sub>Si reaction layer, while Fe and Cr from stainless steel diffuse into Cu to produce a (Cu, Fe, Cr) solid solution. The Mo interlayer mainly acts as both a diffusion barrier and a compliant stress absorber, isolating reaction zones and concentrating part of the residual stress within itself. Finite-element simulations confirm that this design reduces peak Mises stress from 684&#xa0;MPa to 444&#xa0;MPa. At an optimized brazing temperature of 980&#xa0;°C, the joint achieves a shear strength of 32.2&#xa0;MPa, corresponding to 57.5% of the intrinsic strength of C/C-SiC. Thermodynamic, kinetic, and first-principles analyses suggest that Cr plays a dominant role in interfacial bonding, whereas Mo contributes to the redistribution of residual stress and mitigation of brittle fracture. Overall, this multilayer strategy provides mechanistic insight into how Cr-driven interfacial control can be combined with Mo-assisted stress management to design reliable C/C-SiC-metal joints, while the long-term service behavior and extension to other composite/steel combinations remain to be clarified in future work.</p>

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Multilayer interface design for reliable brazing of C/C-SiC to stainless steel: Cr-driven interfacial control and stress redistribution

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月28日

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  • Haitao Zhu,
  • Bo Cheng,
  • Yanyu Song,
  • Hyoung Seop Kim,
  • Naibin Chen,
  • Wenlong Zhou,
  • Duo Liu,
  • Shengpeng Hu,
  • Xiaoguo Song

摘要

Reliable brazing of C/C-SiC composites to stainless steel is hindered by severe residual stresses and uncontrolled interfacial reactions. Here, we introduce a CuMnCr/Mo/Cu multilayer interface that aims to simultaneously regulates stress distribution and interfacial chemistry. Cr from the CuMnCr layer preferentially reacts with C/C-SiC, forming a Cr7C3 + Cr3Si reaction layer, while Fe and Cr from stainless steel diffuse into Cu to produce a (Cu, Fe, Cr) solid solution. The Mo interlayer mainly acts as both a diffusion barrier and a compliant stress absorber, isolating reaction zones and concentrating part of the residual stress within itself. Finite-element simulations confirm that this design reduces peak Mises stress from 684 MPa to 444 MPa. At an optimized brazing temperature of 980 °C, the joint achieves a shear strength of 32.2 MPa, corresponding to 57.5% of the intrinsic strength of C/C-SiC. Thermodynamic, kinetic, and first-principles analyses suggest that Cr plays a dominant role in interfacial bonding, whereas Mo contributes to the redistribution of residual stress and mitigation of brittle fracture. Overall, this multilayer strategy provides mechanistic insight into how Cr-driven interfacial control can be combined with Mo-assisted stress management to design reliable C/C-SiC-metal joints, while the long-term service behavior and extension to other composite/steel combinations remain to be clarified in future work.