一种新型CMAS耦合条件下热障涂层热循环实验方法  

A Novel Thermal Cycling Test Method for Thermal Barrier Coatings Under CMAS Coupled Condition

作　　者：何箐[1] 吴鹏[1] 屈轶[1] 汪瑞军[1] 王伟平[1] 

机构地区：[1]中国农业机械化科学研究院表面工程技术研究所,北京100083

出　　处：《材料工程》2014年第12期92-98,共7页Journal of Materials Engineering

摘　　要：提出一种高温度梯度、燃气加热和CMAS(CaO-MgO-Al2O3-SiO2)沉积条件下热障涂层热循环实验方法,并对1200℃下CMAS沉积物对等离子喷涂热障涂层过早失效的影响因素进行讨论和分析。结果表明:无CMAS耦合条件下,热障涂层热循环寿命为573次;CMAS耦合条件下,热障涂层热循环寿命降低至70次。CMAS渗入会导致陶瓷层表层产生致密层和横向微裂纹增多。CMAS耦合条件下,热障涂层的失效以陶瓷层逐层剥离为主。A thermal cycling test method of thermal barrier coatings（TBC5） under high temperature gradient, gas heating and CMAS（CaO-MgO-A12O3-SiO2） deposition condition were proposed. The rea- sons for the early failure of the plasma-sprayed coating with CMAS deposits at 1200℃ were discussed. The results show that, thermal cycling life of TBCs without CMAS deposition is 573 cycles, and ther- mal cycling life of TBCs with CMAS deposition reduces to 70 cycles. CMAS infiltrates into the surface layer of ceramic coating, forms a dense layer,and transverse cracks increase. The failure of TBCs oc- curs mainly by peeling of the ceramic layer under CMAS coupled condition.

关 键 词：CMAS沉积物 热循环 高温度梯度 热障涂层 失效 

分 类 号：TG174.444[金属学及工艺—金属表面处理]