大气等离子喷涂制备莫来石涂层的性能  

Characteristics of Mullite Coatings Prepared by Air Plasma Spraying

作　　者：安宇龙[1,2] 刘光[1,2] 侯国梁[1,2] 陈建敏[1] 赵晓琴[1] 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,兰州730000 [2]中国科学院北京研究生院,北京100049

出　　处：《材料导报》2011年第2期36-39,共4页Materials Reports

基　　金：国家自然科学基金委创新研究群体科学基金资助项目(50421502)

摘　　要：采用大气等离子喷涂制备莫来石涂层,对涂层进行了热震试验。以OLYCIA m3图像分析软件测定涂层孔隙率,以MH-5-VM型显微硬度仪测定涂层硬度,依照ASTMC633-79标准测定涂层结合强度,以X射线衍射(XRD)和扫描电镜(SEM)表征涂层的相组成和微观形貌。结果表明,莫来石涂层主要由变形颗粒、未熔融粉末及少量孔隙组成,涂层中没有微观裂纹;涂层中含有莫来石晶体和部分非晶态玻璃相;热震过程中,涂层中的非晶转变为晶态莫来石,同时伴随应力释放,导致涂层出现微观裂纹。The mullite coatings were prepared by air plasma sprayed. The as-sprayed coating were carried out thermal shock experiment. The porosity and microhardness were measured by OLYCIA m3 image analysis software and MH-5-VM microhardness tester, respectively. The bond strength of mullite coatings were determined according to ASTM C633-79 standard. The composition and morphology of the mullite coatings were examined by X-ray diffraction （XRD） and scanning electron microscope（SEM）. The results show that as-sprayed coating includes splats grains, partially melted powders and a few pores. The microcracks do not appear in the coating. The as-sprayed coating is largely crystal mullite and only a small quantity of amorphous phase. During thermal shock experiment, amorphous phase in coating changes to crystal mullite and gives rise to stress, leading to microcracks.

关 键 词：大气等离子喷涂 莫来石涂层 热震试验 非晶 

分 类 号：TG174.442[金属学及工艺—金属表面处理]