Effects of surface roughness on CMAS corrosion behavior for thermal barrier coating applications  

作　　者：Lei GUO Guang LI Zhilin GAN 

机构地区：[1]School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China [2]Tianjin Key Laboratory of Advanced Joining Technology,Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education,Tianjin 300072,China

出　　处：《Journal of Advanced Ceramics》2021年第3期472-481,共10页先进陶瓷（英文）

基　　金：This research is sponsored by the National Natural Science Foundation of China(Grant No.51971156).

摘　　要：Calcium-magnesium-alumina-silicate (CMAS) corrosion is an important cause for thermal barrier coating (TBC) failure,which has attracted increased attentions.In this study,some thermal barrier coating (TBC) materials including YSZ (yttria partially stabilized zirconia),GdPO_(4),and LaPO_(4) were prepared into bulks,and the effects of their surface roughness on wettability and spreading characteristics of molten CMAS were investigated.As-fabricated and polished bulks with different surface roughness were exposed to CMAS corrosion at 1250 ℃ for 1 and 4 h,following by macro and micro observations.Results revealed that compared with the as-fabricated bulks,molten CMAS on the polished samples had lower wettability and a smaller spreading area,mainly attributable to the reduced capillary force to drive the melt spreading.Meanwhile,GdPO_(4) and LaPO_(4) bulks exhibited lower CMAS wettability than YSZ bulk.It is thus considered that reducing the surface roughness is beneficial to CMAS corrosion resistance of TBCs.

关 键 词：thermal barrier coating(TBC) calcium-magnesium-alumina-silicate(CMAS) surface roughness WETTING SPREADING 

分 类 号：V263[航空宇航科学与技术—航空宇航制造工程] TG174.4[金属学及工艺—金属表面处理]