摘要
为了突破铝合金表面等离子喷涂热防护涂层结合强度低的技术瓶颈,采用三阴极等离子喷涂系统,在7A04-T6超高强铝合金基材表面制备了8YSZ热防护涂层,借助扫描电镜、X射线衍射仪、显微硬度计及万能力学试验机,分析表征了不同气体流量参数对涂层显微形貌、物相组成、显微硬度及结合强度的影响,并提出了气体流量参数对涂层结合强度影响的临界值。结果表明:不同的气体流量参数下制备的涂层上表面均存在着熔融及半熔融的粉末粒子形貌、不同尺寸的孔隙结构及不同程度的裂纹扩展形貌。伴随着气体流量的增加,涂层的致密度增加,涂层的夯实形貌则呈现先增加后减少的变化趋势。不同气体流量参数下制备的涂层的物相结构与喂料粉末基本一致,都仅存在单一成分的Zr_(0.92)Y_(0.08)O_(1.96)组元。伴随着气体流量参数的增大,涂层的平均显微硬度呈现逐渐增大的变化趋势,涂层的平均结合强度呈现先增大后减小的变化趋势。
To break through the technical bottleneck of low bonding strength of thermal protective coatings prepared by plasma spraying on aluminum alloy surfaces,a three-cathode plasma spraying system was used to prepare 8 YSZ thermal protective coatings on the surface of 7 A04-T6 ultra high strength aluminum alloy.With the help of scanning electron microscope,X-ray diffractometer,microhardness tester and universal testing machine,the effects of different gas flow parameters on the micromorphology,phase composition,microhardness and bonding strength of the coatings were analyzed and characterized.Finally,the critical value of the influence of gas flow parameters on the bonding strength of the coating was proposed.The results show that the upper surface of the coatings prepared under different gas flow parameters all has molten and semi-molten powder particle morphology,pore structure and crack propagation morphology.With the increase of gas flow,the density of the coating increases,and the tamped morphology of the coating shows a trend of increasing first and then decreasing.The phase structure of the coating prepared under different gas flow parameters is basically consistent with that of the feed powder,and there is only a single component of Zr_(0.92)Y_(0.08)O_(1.96).With the increase of gas flow parameters,the average microhardness of the coating shows a gradually increasing trend,and the average bonding strength of the coating shows a trend of increasing first and then decreasing.
作者
孙福臻
李岩
张啸寒
刘光
庞铭
冯胜强
Sun Fuzhen;Li YanZhang Xiaohan;Liu Guang;Pang Ming;Feng Shengqiang(Beijing National Innovation Institute of Lightweight Ltd,Beijing 100083,China;University of Science and Technology Beijing,Beijing 100000,China;Wuhan University,Wuhan 430072,China;Chinese Weapons Science Academy Ningbo Branch,Ningbo 315103,China;Civil Aviation University of China,Tianjin 300300,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2021年第5期1685-1693,共9页
Rare Metal Materials and Engineering
基金
国家重点研发计划重点专项(2018YFB1105800)。
