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以短切碳纤维和纳米氧化铝为原料,采用喷雾干燥方法制备了氧化铝和氧化铝-5 wt%碳纤维喷涂喂料;利用等离子喷涂工艺制备了氧化铝和氧化铝-5 wt%碳纤维涂层,并对所制备的涂层进行了力学性能和摩擦学性能对比分析;利用扫描电镜(SEM)和能谱仪(EDS)对喷涂喂料﹑涂层微观形貌及磨损形貌进行了表征。结果表明,运用喷雾干燥所制备的陶瓷喂料粒度分布均匀,且碳纤维存在于复合喂料中;所制备涂层各层间界面结合良好,且复合涂层中碳纤维与涂层结合良好。与无碳纤维的氧化铝涂层相比,碳纤维的加入使得涂层力学性能得到大幅度提高,且有效降低了涂层的摩擦系数﹑明显提高了涂层的耐磨性。
The chopped carbon fiber and nano-alumina were used as raw materials to prepare spray coating of aluminum oxide and aluminum oxide-5 wt% carbon fiber. The coatings of aluminum oxide and aluminum oxide-5 wt% carbon fiber were prepared by plasma spray process. The mechanical properties and tribological properties of the coatings were compared and analyzed. The spray coating, coating morphology and wear morphology were characterized by scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The results show that the particle size distribution of the ceramic feed prepared by spray drying is uniform and the carbon fibers are present in the composite feeding. The interfacial bonding between the layers of the prepared coating is good and the combination of the carbon fiber and the coating in the composite coating is good. Compared with the non-carbon fiber alumina coating, the addition of carbon fiber makes the coating mechanical properties greatly improved, and effectively reduce the friction coefficient of the coating, significantly improve the wear resistance of the coating.