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用等离子喷涂方法分别制备纯Cr_2O_3以及添加金刚石微粉的Cr_2O_3/C复合涂层,并比较分析了复合涂层的微观结构、力学和摩擦学性能。采用光学显微镜和扫描电镜分析涂层微观结构;用阿基米德原理计算涂层致密度;用高速线性往复磨损试验测试了涂层的磨损性能。结果表明,添加粒度为10μm金刚石微粉后的Cr_2O_3喷涂层的密度、硬度和耐磨性均有提高,其中含10%金刚石微粉的涂层磨损性能最佳,摩擦系数最小为0.06,磨损率最低,仅为9×10-16m3/N·m;适量添加金刚石能够提高Cr_2O_3涂层的摩擦磨损性能;涂层磨损机制是轻微磨粒磨损机制并伴有物质转移。
Pure Cr_2O_3 and Cr_2O_3 / C composite coatings with diamond powders were prepared by plasma spraying. The microstructure, mechanical properties and tribological properties of the composite coating were also analyzed. The microstructure of the coating was analyzed by light microscopy and scanning electron microscopy. The coating density was calculated by Archimedes’ principle. The wear performance of the coating was tested by high speed linear reciprocating wear test. The results show that the density, hardness and wear resistance of Cr2O3 coating increases with the addition of 10μm diamond powder. The wear resistance of the coating containing 10% diamond powder is the best, the friction coefficient is the lowest, the wear rate is the lowest, Only 9 × 10-16m3 / N · m. Appropriate amount of diamond added can improve the friction and wear properties of the Cr_2O_3 coating. The wear mechanism of the coating is a slight abrasive wear mechanism accompanied by material transfer.