To repair the damaged SiC coated C/C composites, a double-layer system including a Sm-doped borosilicate glass external layer and a SiSiC inner layer was prepared by a slurry-based laser cladding technique. Isothermal oxidation experiment and indirect/direct thermal-radiation measurements were performed. The results showed that the absorbance of borosilicate glass to the laser at 900–1200 nm was improved significantly by Sm-doping. Consequently, the repaired coating with a more compact structure and better oxidation resistance was obtained. After oxidation at 1773 K for 10 h, the mass loss of the damaged sample could be reduced by 74.98% with repairing. By increasing laser-absorption and reducing viscosity, the thermal-radiation property of the repaired coating was enhanced to decrease the surface temperature greatly. A repair system with excellent thermal protection performance was achieved.

为了修复受损的 SiC 涂层 C/C 复合材料，采用了一种双层系统，包括 Sm 掺杂的硼硅酸盐玻璃外层和 SiSiC 内层采用浆料激光熔覆技术制备。进行了等温氧化实验和间接/直接热辐射测量。结果表明，Sm掺杂显着提高了硼硅玻璃对激光在900-1200 nm处的吸光度。因此，得到了结构更致密、抗氧化性更好的修复涂层。在 1773 K 氧化 10 h 后，修复后损伤样品的质量损失可减少 74.98%。通过增加激光吸收和降低粘度，增强了修复涂层的热辐射性能，从而大大降低了表面温度。实现了具有优异热保护性能的修复系统。