Achieving high-temperature thermal evacuation between dissimilar materials C_f/C and Mo30Cu by forming a brazed joint

Achieving a high heat transfer is essential for the C_f/C-Mo30Cu dissimilar material components in their applications of thermal nuclear reactions. In this study, the C_f/C composite and the Mo30Cu alloy were successfully brazed by using the Ag-Cu-4.5Ti braze to eliminate interface gaps between them. The maximum thermal conductivity of the C_f/C-Mo30Cu joint at 860 °C /10 min reached 112 W·m⁻¹·K⁻¹(RT). The thermal conductivity of the joint even exceeds that of the C_f/C matrix (107 W·m⁻¹·K⁻¹). It is worth noting that the overall thermal conductivity of the joint can still reach 92 W·m⁻¹·K⁻¹ at 500 °C. Shear test results showed that the average shear strength of the joints achieved 13.1 MPa at the highest thermal conductivity of the joint. A homogeneous TiC layer is generated along the C_f/C interface, which is crucial for maintaining a stable joint and providing a favorable heat transfer channel across the C_f/C-Mo30Cu dissimilar materials.