基于涂层部分熔化(PM)区比例,孔隙率和结合强度,通过系列实验得到最佳喷涂工艺参数.利用XRD衍射仪,扫描电镜和透射电镜研究等离子喷涂纳米结构Al2O3-13wt%/TiO2(AT13)复合涂层的微观结构;对涂层的显微硬度和断裂韧性进行了Weibull统计,通过磨损实验建立了磨损图.研究表明,涂层存在全熔化(FM)区和PM区,关键等离子喷涂参数(CPSP)的增大促进PM区比例的减小及涂层结合强度的增大.喷涂过程中物相发生r反应,涂层中FM和PM区分别由完全和部分熔化的粒子形成.PM区存在纳米尺寸的晶体和非晶态物质,粒子间发生液相烧结.Weibull统计表明涂层显微硬度和断裂韧性的统计分布存在对应于组织的双态分布.PM区的平均显微硬度低于FM区的,而其显微硬度的分散性更大;PM区的平均断裂韧性及其分散性大于FM区.
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