混杂颗粒增强Ni基复合材料的冲蚀磨损性能研究

Erosion wear behaviors of hybrid-particles reinforced Ni matrix composites

煤炭开采、石油化工等极端工况条件下的机械装备对部分关键零部件材料的磨损性能提出了更高要求。本研究设计制备了大尺寸氧化锆颗粒(ZTAp)承载与小尺寸碳化钨颗粒(WCp)强化基体相结合的混杂颗粒增强金属基复合材料,研究了介质、冲蚀角度、ZTAp尺寸、WCp含量对复合材料冲蚀磨损性能的影响及其机理。结果表明,适量ZTAp、WCp的添加能够显著提高复合材料的抗冲蚀磨损性能。固定体积分数的ZTA颗粒,尺寸越大,复合材料冲蚀磨损性能越好,其主要失效形式为脆性剥落和疲劳断裂。WC颗粒通过第二相增强、固溶强化以及析出强化的方式,提高了基体的硬度和耐磨性,抑制了酸性介质中腐蚀与磨损的交互作用,冲蚀过程中主要失效形式为脆性断裂剥落。

The extreme working conditions in coal mining,petrochemical industries,and other related fields have imposed higher demands on the wear resistance of materials used for critical components in mechanical equipment.This study prepared a hybrid-particles reinforced metal matrix composite(MMC)that combines large-size zirconia-toughened alumina particles(ZTAp)as load-bearing elements with small-size tungsten carbide particles(WCp)for reinforcement.Specifically,we probe into the compositesstructure,focusing particularly on the effects of media,erosion angle,ZTAp size,and WCp content on their erosion-wear resistance and the underlying mechanisms.The results indicate that the addition of appropriate amounts of ZTAp and WCp significantly enhances the compositeserosion-wear resistance.Within a fixed volume fraction of ZTAp,larger particle sizes are associated with better ero-sion-wear resistance.The primary failure mechanisms observed are brittle spalling and fatigue frac-ture.Through second-phase reinforcement,solid solution strengthening,and precipitation strengthening,the WC particles enhance the hardness and wear resistance of the matrix,suppressing the interactive effects of corrosion and wear in acidic media.The primary failure mechanism during erosion is brittle fracture and spalling.