Corrosion resistance of non-stoichiometric gadolinium zirconate fabricated by laser-enhanced chemical vapor deposition  

作　　者：Chengguan ZHANG Yun FAN Juanli ZHAO Guang YANG Hongfei CHEN Liangmiao ZHANG Yanfeng GAO Bin LIU 

机构地区：[1]School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China

出　　处：《Journal of Advanced Ceramics》2021年第3期520-528,共9页先进陶瓷（英文）

基　　金：This work was supported by the Natural Science Foundation of Shanghai(No.20ZR1419200);National Natural Science Foundation of China(Nos.52072232 and 52072231);the Program for Professor of Special Appointment(Eastern Scholar)by Shanghai Municipal Education Commission(No.TP2015040).

摘　　要：Gadolinium zirconate (GZ) is a promising candidate for next-generation thermal barrier coating (TBC) materials.Its corrosion resistance against calcium-magnesium-alumino-silicate(CMAS) needs to be further increased for enhancing its in-service life.As the Gd element plays an important role in the CMAS resistance,three GZ coatings (GZ-0.75,GZ-1.0,and GZ-1.2) with different Gd/Zr atomic ratios are designed and deposited by laser enhanced chemical vapor deposition(LCVD) in this work.It is found that the generated Gd-apatite in GZ-1.2 would block micro-cracks inside the column structure and the inter-columnar gap more efficiently.Thus,the CMAS penetration rate (5.2 μm/h) of GZ-1.2 decreases over 27% comparing with GZ-1.0 and GZ-0.75,which is even lower than the Gd_(2)Zr_(2)O_(7) coatings fabricated by electron-beam physical vapor depositions (EB-PVDs).This work provides a feasible way to adjust the coating's corrosion resistance and may guide the development of future coating for long in-service life.

关 键 词：thermal barrier coating(TBC) gadolinium zirconate(GZ) NONSTOICHIOMETRY corrosion resistance 

分 类 号：TG174.4[金属学及工艺—金属表面处理]