超音速火焰喷涂MCrAlY层的抗冲击性能及冲击失效机理  

Impact Resistance and Failure Mechanism of MCrAlY Coating Prepared by High Velocity Oxy-Fuel Spraying

作　　者：陈雄伟[1] 毕刚[1] 赵娜[1] 顾轶蓉[1] 唐慧[1] 

机构地区：[1]宝钢设备检修有限公司表面研究所,上海201900

出　　处：《材料保护》2011年第2期51-53,8,共3页Materials Protection

摘　　要：超音速火焰喷涂(HVOF)的MCrAlY涂层性能优异。在不锈钢表面超音速火焰喷涂MCrAlY层,并对涂层形貌、抗冲击性能、冲击失效机理进行研究。结果表明:当氧气与燃油流量比达到最佳值时涂层抗冲击性能最佳;MCrAlY涂层受钢球冲击时,最初是弱结合表层微凸体受冲击脱落,然后在钢球的循环冲击下,部分微凸体产生滑移、脱落,同时涂层在不断冲击下变形延展从而变薄,最终拱起,再次冲击时破裂剥落;MCrAlY涂层受冲击剥落从涂层与基体结合处开裂开始。MCrAlY coating was prepared on the surface of stainless steel by high velocity oxy-fuel spraying(HVOF).The morphology,impact resistance and impact failure mechanism of the coating were investigated.It was found that the MCrAlY coating obtained under the optimized oxygen to fuel flow rate ratio had the best impact resistance.In the early stage of impact by steel balls,the weakly bonded superficial asperities of the coating were detached,followed by slip and spalling of some asperities under cyclic impact in association with deformation,extension,thinning,hunching-up and final breakage and spalling.Besides,the impact failure of the MCrAlY coating was initiated by the cracking at the coating-substrate interface.

关 键 词：超音速火焰喷涂 MCRALY涂层 抗冲击性能 冲击失效机理 滑移 

分 类 号：TG174.442[金属学及工艺—金属表面处理]