Interaction between ceramic powder and molten calcia-magnesia-alumino-silicate (CMAS) glass, and its implication on CMAS-resistant thermal barrier coatings

SCRIPTA MATERIALIA

卷:112

Article

Krause, Amanda R.¹  Li, Xing¹  Padture, Nitin P.¹ 

[1] Brown Univ, Sch Engn, Providence, RI 02912 USA

关键词: Thermal barrier coatings;    Glass;    Zirconia;    Apatite;    CMAS;   

DOI  :  10.1016/j.scriptamat.2015.09.027

来源: Elsevier

【 摘 要 】

Calcia-magnesia-alumino-silicate (CMAS)-attack mitigation mechanisms of 2ZrO(2)center dot Y2O3 composition TBCs are investigated through a 'model' study where 2ZrO(2)center dot Y2O3 ceramic powders are immersed in molten CMAS glass for various durations at 1300 degrees C. The key insight gained from this study is that the formation of the CMAS-blocking apatite phase requires high concentration of Y3+ within a confined volume of CMAS, whereas the presence of a large-volume CMAS sink for Y3+ precludes the formation of apatite. It is also demonstrated that the ceramic microstructure has a profound effect on its dissolution and penetration by CMAS, and on the concomitant crystallization of apatite. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

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