碳化硅-碳/碳复合材料表面掺铬碳膜的研究

Research on Carbon Film Doped with Chromium on the Carbon-Carbon Composites with SiC Interlayer

碳/碳复合材料既有良好的生物相容性,又有良好的力学性能,是一种极具潜力的新型生物材料。为提高其硬度、耐磨性,降低摩擦系数,需对其表面进行处理。本研究先利用包埋法在其表面制备SiC涂层,后利用非平衡磁控溅射技术在SiC涂层表面制备了掺铬碳膜。通过XRD,Raman,SEM,EDAX和XPS对其结构和形貌进行了表征,用MM-200型环块磨损试验机对膜的摩擦学性能进行了测定。研究结果表明:掺铬碳膜在XRD及拉曼光谱上都没有明显的峰,为非晶态结构。碳原子主要为类石墨碳。非晶态掺铬碳膜的摩擦系数约为0.100,比碳/碳复合材料低;磨损率为0.45×10-6mm3·(Nm)-1,也比碳/碳复合材料低。

Carbon/carbon composites have good mechanical properties and preserve excellent biocompatibility, which make them great potential as orthopedic implants in human body. In order to keep stability of the implants and avoid the unknown effect induced by carbon particle which produce by the wear. It is necessary to coat them with hard coating which can reduce the wear and friction coefficient. In this paper, carbon film doped with chromium on the surface of carbon/carbon has been prepared by unbalanced magnetron sputter technology, in which SiC coating served as interlayer. The morphologies, components and structure were characterized by SEM, EDAX, Raman, XPS and XRD. The tribological properties of the film were also measured. The results show that the structure of the film is amorphous. Most of carbon atoms on carbon film are in the form of graphite-like carbon. The friction coefficient of the carbon film is 0.100, which is less than C/C composite （0.133）, and the wear of the film is 0.45 ×10^-6 mm^3·（Nm）^-1, which is also less than C/C composite （2.48 ×10^-6 mm^3·（Nm）^-2）.