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本研究提出一种C_f/SiC复合材料表面改性新方法为水基浆料涂覆结合原位反应烧结工艺。系统研究了SiC和炭黑在水基浆料中的共分散、粘结剂的量和浆料固含量对浆料流变性能的影响、涂层的微观结构和性能等。研究结果表明:采用水基浆料涂覆工艺可在基材表面制备一层气孔率达49%的多孔C/SiC预涂层;通过液相渗硅原位反应工艺,多孔预涂层转变为高致密、与基材强结合的光学涂层,并且在涂层与基材间形成了~15μm的化学反应过渡层;Si/SiC涂层的维氏硬度为(14.19±0.46)GPa,断裂韧性为(3.02±0.30)MPa·m1/2;经过精细研磨抛光,涂层的表面粗糙度可达2.97 nm RMS。
In this study, a new method for surface modification of C_f / SiC composites was proposed, which was water-based slurry coating combined with in-situ reaction sintering. The effects of co-dispersion of SiC and carbon black in water-based slurry, the amount of binder and the solid content of slurry on the rheological properties of the slurry and the microstructure and properties of the coating were investigated systematically. The results show that the porous C / SiC precoating layer with a porosity of 49% can be prepared on the surface of the substrate by water-based slurry coating process. By the liquid-in- High density, strong optical bond with the substrate, and the formation of chemical reaction between the coating and the substrate transition layer 15μm; Si / SiC coating Vickers hardness of (14.19 ± 0.46) GPa, fracture toughness (3.02 ± 0.30) MPa · m1 / 2. After fine grinding and polishing, the surface roughness of the coating can reach 2.97 nm RMS.