摘要
激光熔覆是一种新型表面改性技术,具有能量密度高、稀释率可控、涂层与基体呈现良好的冶金结合等优点,且快热快冷的特性有利于在基材表面形成具有细小致密组织的涂层,从而获得耐磨耐蚀等优异性能。WC增强Ni基复合涂层因兼具陶瓷材料优异的耐高温、耐磨性和金属材料良好的强韧性,近些年成为激光熔覆研究领域的热点。综述了激光熔覆WC增强Ni基复合涂层的研究进展。概述了WC在复合涂层中的作用,包括WC的强化机制及其对复合涂层摩擦磨损性能及磨损机制的影响。在此基础上,从Ni基合金成分、WC增强相的添加量、尺寸、种类以及稀土元素的影响等方面,论述了激光熔覆WC增强Ni基复合涂层的材料体系,重点讨论了WC在复合涂层中的分布规律和存在形式。同时综述了激光功率、扫描速度、基体预处理等熔覆工艺参数,以及超声振动辅助、感应加热等新型激光熔覆技术,对复合涂层成形质量、微观组织、物相组成及性能的影响。最后对现阶段激光熔覆WC增强Ni基复合涂层研究中存在的问题及未来发展方向进行了展望。
Laser cladding is a new type of surface modification technology,which has the advantages of high energy density,controllable dilution rate,good metallurgical bonding between the coating and the substrate.The characteristics of fast heating and fast cooling are conducive to the formation of a coating with fine and compact structure on the surface of the substrate,so as to obtain excellent performance such as wear resistance and corrosion resistance.In recent years,WC reinforced Ni-based composite coatings have become a hot topic in the field of laser cladding because it can combine the excellent high temperature resistance and wear resistance of ceramics with the good strength and toughness of metals.In this paper,the research progress of laser cladding WC reinforced Ni-based composite coatings is reviewed.The role of WC in composite coatings,including the strengthening mechanism of WC and its effect on the friction and wear properties and wear mechanism of the composite coatings were summarized.On this basis,the material system of laser cladding WC reinforced Ni-based composite coatings was discussed from the aspects of Ni-based alloys,the addition amount,size,type of WC reinforcing phase and the influence of rare earth elements.The distribution and existence form of WC in the composite coating were emphatically discussed.At the same time,the effects of laser power,scanning speed,substrate pretreatment and new laser cladding technologies,such as ultrasonic vibration assist and induction heating,on the forming quality,microstructure,phase composition and properties of the composite coatings were reviewed.Finally,the existing problems and future development of laser cladding WC reinforced Ni based composite coatings were prospected.
作者
李倩
陈发强
王茜
张峻巍
LI Qian;CHEN Fa-qiang;WANG Qian;ZHANG Jun-wei(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2022年第2期129-143,共15页
Surface Technology
基金
国家自然科学基金项目(51874091)
辽宁省教育厅优秀青年科技人才项目(2020LNQN01)
辽宁科技大学青年教师科研基金项目(2019QN02)。
关键词
激光熔覆
NI基复合涂层
WC
耐磨性能
laser cladding
Ni-based composite coating
tungsten carbide
wear properties
作者简介
李倩(1997—),女,硕士研究生,主要研究方向为激光表面改性。;通讯作者:王茜(1991—),女,博士,讲师,主要研究方向为材料表面改性、高温腐蚀与防护。
