CoCrWSi涂层高温冲击磨粒磨损行为  

Impact Abrasive Wear of CoCrWSi Coating at High Temperature

作　　者：王浩宇 曹晓英[2,3] 李定骏 方修洋[1] 蔡振兵 WANG Haoyu;CAO Xiaoying;LI Dingjun;FANG Xiuyang;CAI Zhenbing(Tribology Research Institute,Southwest Jiaotong University,Chengdu 610031,China;Dongfang Turbine Co.,Deyang 618000,China;Long-life Temperature Materials State Key Laboratory,Deyang 618000,China)

机构地区：[1]西南交通大学摩擦学研究所,成都610031 [2]东方汽轮机有限公司,德阳618000 [3]长寿命高温材料国家重点实验室,德阳618000

出　　处：《中国表面工程》2023年第3期193-204,共12页China Surface Engineering

基　　金：长寿命高温材料国家重点实验室开放课题资助项目(DTCC28EE200791)。

摘　　要：CoCrWSi涂层由于其优异的耐高温氧化性能,有望成为汽轮机零部件的防护涂层之一。但是关于该涂层在汽轮机真实服役环境中的高温冲击磨粒磨损行为却鲜有报道。以汽轮机阀门部件材料SA-182F92为基体,制备CoCrWSi防护涂层。利用自研的高温沙粒冲击试验机,研究CoCrWSi涂层在沙蚀环境中的高温冲击磨损行为,通过冲击动力学响应和磨痕形貌来评价该涂层的耐冲击磨粒磨损性能。结果表明:CoCrWSi涂层具有耐高温冲击磨粒磨损性能,具体表现为相同冲击次数下,CoCrWSi涂层样品的磨损面积、磨损体积和最大磨痕深度比基体样品小数倍,CoCrWSi涂层样品的能量吸收量和吸收率均小于基体样品。在高温沙粒环境下,冲击的过程中会有大量的沙粒嵌入磨痕表面,沙粒具有的不规则棱角会切削磨痕表面,进而磨痕表面可以观察到大量犁沟。在高温沙粒环境下,基体与涂层的磨损机理为塑性变形和磨粒磨损。不同的是,软化的基体在冲击区域边缘有明显的隆起,发生更严重的塑性变形;而涂层在冲击过程中虽没有完全剥落,但涂层内部萌生了微裂纹,磨痕表面也有部分涂层剥落。研究结果是在模拟汽轮机真实服役状况下得出的,试验参数如加热温度、沙粒(杂质)、摩擦副材料等均依据汽轮机涂层应用的实际工况进行选择,对CoCrWSi涂层在汽轮机零部件上的应用有一定指导意义。With the development of steam turbines,the key parts of the steam turbine blades will suffer from mechanical damage,including friction wear and solid erosion,owing to the influence of high-temperature fluid and impurities.Therefore,materials used for the high-temperature components of steam turbines are required to have excellent thermal strength,oxidation resistance,and other comprehensive properties.Usually,high-temperature protective coatings are sprayed on these key components via various processes to improve the physical and chemical properties of the substrate at high temperatures.CoCrWSi coating is expected to become a protective coating for steam turbine parts owing to its excellent high-temperature oxidation resistance.However,there are few reports on the high temperature impact abrasive wear behavior of this coating.The CoCrWSi protective coating was prepared based on the steam turbine valve component material SA-182F92.The high temperature impact wear behavior of CoCrWSi coating in a sand erosion environment was studied by using self-developed high-temperature sand impact tester.The impact wear resistance of the coating was evaluated by dynamic response and impact wear scar morphology.The dynamic response data of the impact process,including the impact velocity curve and impact force curve,were obtained through the corresponding sensors.On the macro level,an optical microscope was used to observe the wear condition of the sample surface.On the micro level,SEM was used to observe the micro morphology of the surface and section of the wear scar,EDS was used to analyze the element distribution of the surface and section of the wear scar,and white light interferometer was used to measure the profile of the wear scar to obtain the maximum wear depth,area,and volume.The results show that the impact return velocity and impact force of the coating and substrate decrease with the increase in impact cycles,which is caused by the increase in contact area and decrease in stress during the impact.At the same impact

关 键 词：CoCrWSi涂层 高温沙粒冲击 动力学响应 磨粒磨损 

分 类 号：TG156[金属学及工艺—热处理] TB114[金属学及工艺—金属学]