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In this study, the high-temperature corrosion behavior was evaluated for (La,Gd)2Zr2O7 (LGZ) used as a promising thermal barrier coatings (TBCs) material. (La,Gd)2Zr2O7 + YSZ multilayer prepared from atmos pheric plasma spray (APS) were exposed to calcium-magnesium-alumino-silicate (CMAS) melt at 1300 °C for 2, 12, 48, and 100 h. Molten CMAS and (La,Gd)2Zr2O7 reacted to form reaction layer Ca2Gd8(SiO4)6O2 (apatite) at 1300 °C. The thickness of the reaction layer increased with increasing heat-treatment time. A correlation between the hardness and Young’s modulus relationship for the reaction layer of the coating was observed for the microstructure using nanoindentation. It was confirmed that the pores of the coating were reduced through the infiltration of molten CMAS in the initial stage of the corrosion reaction, and the hardness and Young’s modulus were increased due to densification. Fracture toughness increased with heat treatment time in both directions (in-plane and through-thickness). The fracture toughness in the in-plane direction is 0.19–0.23 MPa. On the other hand, the fracture resistance in the thickness direction was 0.87–1.26 MPa, which was higher than that in the in-plane direction. These results show that the crack propagates in the in-plane direction and causes TBC delamination.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Thermal barrier coatings, Corrosion, CMAS, Rare-earth zirconate

刊行年月日: 2024-05-01

出版者: Ceramic Society of Japan

掲載誌:

• Journal of the Ceramic Society of Japan (ISSN: 13486535) vol. 132 issue. 5 p. 205-213 23096

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.2109/jcersj2.23096

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更新時刻: 2024-08-29 16:30:27 +0900

MDRでの公開時刻: 2024-08-29 16:30:27 +0900