An aluminum surface modification strategy for enhancing CMAS corrosion resistance of environmental barrier coatingsOA
As the inlet temperature of engines increases,injected sand,volcanic ash,and dust melt to form calcium−magnesium−aluminosilicate(CMAS)glass,which subsequently adheres to the surface of ytterbium monosilicate(YbMS;Yb2SiO5)environmental barrier coatings(EBCs),posing a serious degradation threat.In this study,a novel aluminum surface modification strategy was proposed to prevent direct interaction between the coatings and CMAS,thereby increasing corrosion resistance.The modification confers a dualprotection mechanism:First,it seals exposed interconnections deposited by air plasma spray(APS)and facilitates the in situ formation of a dense,continuous ytterbium aluminum garnet(YbAG;Yb_(3)Al_(5)O_(12))layer,serving as the primary,nonreactive physical barrier against CMAS infiltration;second,it inhibits silica consumption by YbMS while releasing silica into the melt.This process increases the melt viscosity,fundamentally suppressing CMAS penetration.The combined effect of these mechanisms extends the coating life by at least 10 times.Although the CMAS resistance of unmodified YbMS is inferior to that of previous ytterbium disilicate(YbDS;Yb2Si2O7)coatings,aluminum-modified YbMS has significantly greater resistance than modified YbDS.This performance reversal is attributed to the unique microstructure of YbMS,which favors the formation of a higher-quality,more protective YbAG layer,thereby fundamentally altering the CMAS interaction mechanism.
Lin Dong;Chen-Ze Bai;Mei-Jun Liu;Guan-Jun Yang;Wen-Jing Wang;Xiao-Feng Zhang;Ke-Song Zhou
State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,ChinaState Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,ChinaState Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,ChinaState Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,ChinaState Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,ChinaNational Engineering Laboratory for Modern Materials Surface Engineering Technology,Guangdong Academy of Science,Guangzhou 510650,ChinaNational Engineering Laboratory for Modern Materials Surface Engineering Technology,Guangdong Academy of Science,Guangzhou 510650,China
矿业与冶金
environmental barrier coatings(EBCs)calcium−magnesium−aluminosilicate(CMAS)corrosion resistancedensificationsurface modification
《Journal of Advanced Ceramics》 2026 (2)
P.9-24,16
supported by the National Natural Science Foundation of China(Nos.52301102 and 52471092)the Postdoctoral Research Foundation of China(No.2024M752571)the Fundamental Research Funds for the Central Universities.
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