环境障涂层吹砂及热梯度烧蚀行为  

Behavior of Sand Blasting and Thermal Gradient Burning of Environment Barrier Coatings

作　　者：杨斌 侯伟骜 原慷 YANG Bin;HOU Weiao;YUAN Kang(AECC Guizhou Liyang Aviation Power Co.,Ltd.,Guiyang 550014,China;BGRIMM Technology Group,Beijing 100160,China)

机构地区：[1]中国航发贵州黎阳航空动力有限公司,贵阳550014 [2]矿冶科技集团有限公司,北京100160

出　　处：《有色金属工程》2023年第2期51-58,共8页Nonferrous Metals Engineering

基　　金：国家科技重大专项(2017-Ⅵ-0020-0093)。

摘　　要：环境障涂层(EBC)在实际服役过程中不仅面临高温燃气热梯度烧蚀环境,还会面临砂砾冲蚀情况。对等离子喷涂的EBC涂层(底层为硅,面层为双硅酸镱)进行了表面吹砂和高温燃气热梯度烧蚀考核试验。首先对EBC涂层的吹砂行为进行了分析,结果表明,吹砂会引起涂层开裂和表层剥落。在经过了1400℃烧蚀考核后,分析了样品不同区域的烧蚀形貌,并重点研究了中心烧蚀区的涂层失效行为。结果表明,中心烧蚀区涂层失效与硅元素的扩散直接相关。根据内部微观组织及显微成分的分析,给出了硅扩散导致涂层烧蚀剥落的机理分析。Environment Barrier Coatings(EBCs)working in real service process meet not only environment of high-temperature gases with thermal gradient burning,but also condition of sand blasting.In this paper,EBCs made by plasma spray with Si bond coat and Yb 2 Si 2 O 7 top coat were tested by surface blasting and hot-gas thermal gradient burning.Firstly,the sand-blasting behavior of the EBCs was analyzed.The results showed that the blasting caused the cracking and spallation of the coatings.Secondly,the surface burning morphology was analyzed at different sample zones after the burning test at 1400℃,and the coating failure behavior at the center burning zone was studied.The results indicated that the coating failure was directly related to the diffusion of Si.According to the microstructure and micro composition study,the mechanism of the coating burning failure induced by Si diffusion was clarified in discussion.

关 键 词：环境障涂层 吹砂 温度梯度 烧蚀 失效 

分 类 号：TG174[金属学及工艺—金属表面处理]