CMAS-phobic and infiltration-inhibiting protective layer material for thermal barrier coatings  

作　　者：Shjun Meng Lei Guo Hongbo Guo Yuanpeng Wang Hongli Liu 

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,Tianjin300072,China [3]School of Materials Science and Engineering,Beihang University,Beijing 100191,China [4]College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China

出　　处：《Journal of Advanced Ceramics》2024年第8期1254-1267,共14页先进陶瓷（英文）

基　　金：This study is sponsored by the National Natural Science Foundation of China(No.52272070);the National Science and Technology Major Project(No.J2022-VI-0009-0040).

摘　　要：Calcium-magnesium-alumina-silicate(CMAS)corrosion has attracted special attention in the thermal barrier coating(TBC)field.At high temperatures,when CMAS melts,it adheres to the coating surface and penetrates the interior,severely destroying the TBC.In this study,a promising CMAS-phobic and infiltration-inhibiting material,GdPO4,on which molten CMAs is difficult to wet and penetrate,was proposed.These desirable attributes are explained by analyzing the material characteristics of GdPO_(4) and its interfacial reaction with CMAS.GdPO4 is demonstrated to have low surface energy,making it difficult for molten CMAS to wet and adhere to the surface.When in contact with molten CMAS,a double-layer structured reaction layer consisting of an acicular upper sublayer and a compact lower sublayer is formed on the GdPO4 surface,which can effectively impede molten CMAS spreading and penetration.First-principles calculation results revealed that the reaction layer has low surface energy and low adhesion to CMAS,which are favorable for molten CMAS phobicity.Additionally,the formation of the reaction layer increases the viscosity of the molten CMAS,which can increase melt wetting and penetration.Hence,GdPO4,which exhibits excellent CMAS-phobicity and infiltration-inhibiting ability,is a promising protective layer material for TBCs against CMAS adhesion and attack.

关 键 词：thermal barrier coatings(TBCs) calcium-magnesium-alumina-silicate(CMAS)-phobicity GdPO_(4) interface reaction layer first-principles calculation 

分 类 号：TG174.4[金属学及工艺—金属表面处理]