Ti-Ni热喷涂层的制备及其空泡腐蚀性能  

Preparation of Titanium-Nickel Coating on Stainless Steel Substrate by Low-Temperature High Velocity Oxy-Fuel Spraying and Evaluation of Its Cavitation Erosion Behavior

作　　者：张梦婷[1,2] 刘敏[2] 邓春明[2] 刘立斌[1] 曾威[2] 林秋生[2] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]广州有色金属研究院,广东广州510651

出　　处：《材料保护》2013年第9期20-22,47,共4页Materials Protection

基　　金：广东省自然科学基金(1051065101000002)资助

摘　　要：由于空泡溃灭时产生的高温高压气泡对材料损伤影响的复杂性,目前对空泡腐蚀的机理尚无统一认识。以Ni包覆Ti粉末,采用低温超音速火焰喷涂和热处理相结合的方法在316L不锈钢上制备了Ti-Ni涂层。采用SEM、XRD等对涂层的显微结构和相组成进行了表征,并与超音速火焰喷涂WC层对比,利用超声波处理仪评价了Ti-Ni涂层的空泡腐蚀性能,并分析了涂层的失效机理。结果表明,热处理态Ti-Ni涂层以Ni-Ti合金为主晶相,并含有少量的Ni3Ti和Ti2Ni,涂层的抗空泡腐蚀性能较好,优于喷涂态和WC涂层;Ti-Ni涂层的空泡腐蚀先在涂层孔隙缺陷处萌生,形成裂纹并逐渐扩展,最终导致涂层剥落。Ni-cladding Ti power was adopted as feedstock to prepare Ti-Ni coating on the surface of 316L stainless steel by low-temperature high velocity oxy-fuel spraying in association with heat treatment. The microstructure and phase composition of as-prepared Ti-Ni coating were analyzed by means of scanning electron microscopy and X-ray diffraction. Moreover, an ultrasonic facility was performed to evaluate the cavitation erosion behavior of Ti-Ni coating,and the failure mechanism of the coating was discussed as well. Results showed that as-prepared Ti-Ni coating consisted of Ni-Ti alloy as the major phase,and contained a small amount of Ni 3 Ti and Ti 2 Ni,and it exhibited better resistance to cavitation erosion than WC coating. In terms of the cavitaion erosion mechanism of Ti-Ni coating,cavitaion erosion was firstly initiated at the pores of the coating,then cracks was gradually formed and extended,and finally peeling off of the coating was caused.

关 键 词：空泡腐蚀 低温超音速火焰喷涂 Ti—Ni涂层 316L不锈钢 热处理 

分 类 号：TG174.442[金属学及工艺—金属表面处理]