基于在线监测的可磨耗涂层喷涂参数优化研究  

Spraying Parameters Optimization of Abradable Coating based on On-line Monitoring

作　　者：王斌利 魏磊 胡江波 李迎军 Wang Binli;Wei Lei;Hu Jiangbo;Li Yingjun(AVIC Xi'an Aero Engine Co.,Ltd.,Xi'an,710021)

机构地区：[1]中国航发西安航空发动机有限公司,西安710021

出　　处：《热喷涂技术》2021年第4期42-48,41,共8页Thermal Spray Technology

摘　　要：本文通过在线监测诊断工具,采集测试了低压等离子体射流中CoNiCrAlY飞行粒子速度和温度变化规律,选定电流I、喷涂距离d、主气Q及辅气q四种主要工艺参数作为试验因素,通过正交试验法优化了CoNiCrAlY粉末材料低压等离子喷涂工艺参数。采用光学显微镜、扫描电镜、涂层表面洛氏硬度计等对涂层金相组织、显微硬度、拉伸结合强度等性能进行表征。结果表明,采用优化后工艺参数制备的涂层,显微组织粉末熔化充分,涂层组织致密;涂层结合强度提高11.8%、显微硬度提高17.1%;涂层经1000℃保温0~300 h热稳定后,其室温硬度有降低、高温硬度有升高的趋势,高温硬度明显低于室温硬度。In this paper,the velocity and surface temperature of flying particles in low-pressure plasma jet are collected and measured by on-line monitoring and diagnosis tools.The current(I),spraying distance(d),main gas(Q)and auxiliary gas(q)were selected as the test factors,and the low-pressure plasma spraying process parameters of CoNiCrAlY powder were optimized by orthogonal test.The microstructure,surface hardness,microhardness and bonding strength of the coating were characterized by optical microscope,scanning electron microscope,coating surface Rockwell hardness tester and microhardness tester.The results showed that the under the optimized process parameter,the powders were fully melted and the microstructure of the coating was compact.The bonding strength and microhardness of the coating was increased by 11.8%and 17.1%respectively.After the coating was stabilized at 1000℃for 0~300 h,the hardness at room temperature decreased,while the hardness at high temperature increased.The hardness at high temperature was obviously lower than that at room temperature.

关 键 词：在线监测 低压等离子喷涂 高温可磨耗涂层 正交试验法 

分 类 号：TG174.4[金属学及工艺—金属表面处理]