(江苏大学 机械工程学院 先进成形技术研究所, 镇江 212013)
摘 要: 采用常规喷焊工艺和改进喷焊工艺， 在Ti-6Al-4V合金表面上制备了镍基耐磨涂层， 分析了涂层的形貌和合金元素的扩散， 测试了涂层的显微硬度， 定性地研究了基体和涂层的结合性能。 结果表明： 改进工艺所制备的涂层组织和性能均优于常规工艺的， 涂层组织的均匀性大大提高， 晶粒得到细化； 基体和涂层为明显的冶金结合； 涂层显微硬度的变化沿层深方向呈连续性和渐变性， 其表层显微硬度高达HV933.2。 采用合理的喷焊工艺能够在钛合金表面制备出性能优良的耐磨涂层。
关键字: 钛合金； 镍基涂层； 火焰喷焊； 显微组织； 性能
（ Institute of Advanced Forming Technology, School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China）
Abstract: The Ni based wear resistance coatings on the Ti-6Al-4V alloy substrate by common flames spray-welding technique and flames spray-welding improved technique were prepared. The microstructures and the elements distributions of coating were analyzed, and the microhardness and adhesion properties were studied. The results show that the microstructures and properties of coating prepared by the improved technique have been improved obviously, the uniformity of coating microstructure is improved and its grains become smaller, the adhesion of the substrate and the coating is metallurgical bonding. The change of microhardness for coating are continuous and gradual along depth direction, and the microhardness of spray-welding surface is HV933.2. It indicates that adopting improved spray-welding technique is able to prepare excellent wear resistance coating on the titanium alloys substrate.
Key words: titanium alloy; Ni-based coating; flames spray-welding; microstructure; property
