激光重熔等离子喷涂自润滑复合涂层研究

Study of Plasma Spray and Laser Remelting Self-lubricating Composite Coatings

为获得高副接触情况下具有抗疫劳的自润滑涂层,采用包覆的Ni包TiB2和Ni包石墨超细微粉,在9Cr18不锈钢表面,利用激光重熔等离子喷涂方法制备金属陶瓷自润滑复合涂层。研究了涂层制备的工艺方法、组织特征、界面形态及其形成机制,分析了涂层的耐磨性、抗疲劳性、自润滑性、组成物质及元素分布。结果表明,激光重熔等离子喷涂Ni包TiB2/Ni包石墨涂层,能够大大改善等离子喷涂层的组织结构,获得组织均匀致密,与基体结合强度高,同时含有硬质相和润滑相的复合涂层,在一定程度上减小了涂层的干摩擦系数,提高了涂层的耐磨性和抗疲劳性。

In order to obtain the self-lubricating and anti-fatigue composite coatings for tribological metal surfaces with high pair contact, ceramic-metal composite coatings with ultrafine nickel-coated TiB2 and graphite powder have been attained by plasma spray and laser remelting on stainless steel 9Cr18. The processing method, microstructure, interface, tribological properties, distribution of the elements and the mechanism of the coatings to form were analyzed. Results show that laser remelting can greatly improve the microstructure of plasma spray's nickel-coated TiB2 and graphite composite coatings. The remelted coatings with hard phases and lubricant have uniform and densified microstructure, firm interface, lower friction coefficient, higher wear resistance and fatigue resistance under dry friction conditions.