为了提高 Ti6Al4V 钛合金的耐磨特性,在Ti6Al4V钛合金表面利用激光沉积制备了以 WC 颗粒为强化相的涂层。观察了耐磨涂层的微观组织,并测量了涂层和 Ti6Al4V 基材在室温条件下的摩擦磨损性能及其显微硬度。结果表明,WC 颗粒增强相均匀弥散分布在基体中,颗粒发生了部分熔化,从颗粒中心到基体分布呈现出不同的形态和组分。由于未熔WC颗粒和生成的TiC弥散强化及激光沉积基体组织的细晶强化作用,基材的硬度和耐磨性均得到了提高。在相同的摩擦磨损条件下,基材的体积磨损量是复合涂层的55.2倍。
To improve the wear resistance of Ti6Al4V alloy surface,Ti-matrix gradient composite coatings rein-forced by WC particles were deposited by laser metal deposition(LMD)process on Ti6Al4V substrate.The mi-crostructure and worn surface were investigated,and the coatings microhardness and friction wear properties of the coatings and substrate were examined in air.The results show that the WC reinforced phases distribute on deposition layers evenly and the particles melt down partially which shows different morphology and compo-nent.Microhardness analysis indicates that the hardness shows gradient ascent from the substrate to the coat-ings surface,and the wear resistance of coatings has improved 55.2 times compared with substrate.High micro-hardness and good wear resistance property are due to the small grain size and dispersion strengthening of un-melted WC and TiC particles generated in LMD process.
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