CMAS渗入对等离子喷涂YSZ热障涂层形貌的影响  

Influence of CMAS Infiltration on Microstructure of Plasma-sprayed YSZ Thermal Barrier Coating

作　　者：何箐[1] 刘新基[1] 柳波 吕玉芬[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北京金轮坤天特种机械有限公司,北京100083 [2]贵州黎阳航空动力有限公司,贵州平坝561114

出　　处：《中国表面工程》2012年第4期42-48,共7页China Surface Engineering

摘　　要：研究了等离子喷涂不同结构YSZ涂层在CMAS渗入作用下的形貌演变规律。对带有模拟CMAS沉积物的YSZ涂层进行高温热处理试验,并在低CMAS输送量条件下对YSZ涂层进行冲刷试验,试验后涂层均出现了严重的层间剥离失效。通过试验前后涂层的截面形貌及Raman光谱分析,结果表明:涂层的显微形貌变化主要表现在高温下熔融态CMAS沿涂层表面微裂纹和孔隙渗入内部,引起YSZ陶瓷层孔隙收缩、表层致密化,同时在涂层表面粘附的CMAS耦合作用下,YSZ涂层表层中产生大量横向微裂纹和明显分层;另外,YSZ涂层表层在CMAS中溶解并导致YSZ加速相变失稳也是影响涂层形貌变化和过快失效的因素之一。CMAS沉积层厚度增加时,同等条件下CMAS对涂层失效的影响会加剧。The evolvement disciplinarians of microstructure after CMAS infiltering into various YSZ coatings were researched.Both YSZ coatings with simulated CMAS deposits that were heat-treated and YSZ coatings eroded by CMAS were delaminated.The coatings were analyzed through SEM and Raman spectrum.Results show that CMAS infilters through the crack and pore at high temperature,which can resulted in the pores shrinkage and surface layer densification.Together with the CMAS adhering to surface of coatings,this leads to the high volume cracks and obvious delamination in the surface layer.Additionally,accelerating phase transform destabilization of YSZ coating,which is caused by coating surface layer dissolved in the CMAS,was one of the main factors of microstructure change and prematurity failure.The influence of CMAS on coatings failure will increase with increasing thickness of the coatings.

关 键 词：CMAS沉积物 YSZ 热障涂层 失效 

分 类 号：TG174.442[金属学及工艺—金属表面处理]