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运用等离子喷涂技术在45钢表面制备了NiCrBSi-Y2O3复合涂层,研究了其微观组织和摩擦学性能。结果表明:等离子喷涂NiCrBSi-Y2O3复合涂层主要由γ-Ni、CrB、Cr7C3和Y2O3等物相组成。在复合涂层中添加适量的Y2O3可增加CrB和Cr7C3等硬质相的含量,并提高复合涂层的致密度。当Y2O3含量(质量分数)为0.5%时,NiCrBSi-Y2O3复合涂层具有优异的摩擦学性能,其摩擦因数为0.175,仅为纯NiCrBSi涂层的37%;其磨损质量为1.2mg,比纯NiCrBSi涂层的降低了43%。当载荷为6~10N时,NiCrBSi-Y2O3复合涂层呈轻微磨损,其磨损机理主要为粘着磨损,并伴有轻微的微观切削和微观断裂磨损;当载荷达到12N时,复合涂层产生严重磨损,其磨损机制转变为粘着磨损和严重的微观切削磨损。
The NiCrBSi-Y2O3 composite coating was prepared on the surface of 45 steel by plasma spray technique, and its microstructure and tribological properties were studied. The results show that plasma spraying NiCrBSi-Y2O3 composite coating mainly consists of γ-Ni, CrB, Cr7C3 and Y2O3 phases. Adding appropriate amount of Y2O3 in the composite coating can increase the content of hard phase such as CrB and Cr7C3, and increase the density of the composite coating. When Y2O3 content (mass fraction) is 0.5%, NiCrBSi-Y2O3 composite coating has excellent tribological properties, the friction coefficient is 0.175, only 37% of pure NiCrBSi coating; the wear quality is 1.2mg, NiCrBSi coating is reduced by 43%. When the load is 6 ~ 10N, the NiCrBSi-Y2O3 composite coating shows a slight wear, the wear mechanism is mainly adhesive wear, with slight micro-cutting and micro-fracture wear; When the load reaches 12N, the composite coating has serious wear , The wear mechanism changes into sticking wear and severe micro-cutting wear.