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用双层辉光等离子渗金属技术,在C/C复合材料基体表面制备了铼涂层,研究了铼涂层显微结构、相组成、硬度以及结合强度。结果表明,铼涂层致密光滑,由多晶结构的柱状晶粒组成,晶粒尺寸在0.5～1.5μm之间。涂层(110)和(103)晶面发生了择优生长。涂层HV显微硬度为6.66±0.25GPa。制备过程中涂层与基体发生互扩散,界面既有机械结合又有物理结合。划痕试验加载过程中,当C/C复合材料基体由于硬度和韧性低而发生破碎后,铼涂层与基体仍结合良好。
The rhenium coating was prepared on the surface of C / C composites by double glow plasma infiltration metal technology. The microstructure, phase composition, hardness and bonding strength of rhenium coating were studied. The results show that the rhenium coating is dense and smooth and composed of columnar grains with polycrystalline structure with the grain size of 0.5 ~ 1.5μm. Preferential growth occurred in the (110) and (103) planes. The HV hardness of the coating is 6.66 ± 0.25GPa. In the process of preparation, the coating and the substrate interdiffuse each other, and the interface has both mechanical bonding and physical bonding. Scratch test loading process, when the C / C composite matrix due to low hardness and toughness of the crushing, the rhenium coating and the substrate is still well bonded.