CMAS corrosion characteristics of YSZ and Al2O3-YSZ thermal barrier coatings at 1250 °C–1350 °C

The calcium-magnesium-aluminum-silicate (CMAS) corrosion is now a great threat to thermal barrier coatings (TBCs), inducing coating spallation readily. The CMAS corrosion characteristics of both 7YSZ and 20 wt.%Al2O3-YSZ TBCs at a broad temperature range of 1250 °C to 1350 °C were investigated. 7YSZ...

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Vydané v:Journal of the European Ceramic Society Ročník 44; číslo 15; s. 116789
Hlavní autori: Dou, Mengfan, Gao, Wei, Xue, Ting, Han, Jiasen, Wu, Dongting, Zou, Yong, Zhang, Yongang
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Elsevier Ltd 01.12.2024
Predmet:
Al2O3-7YSZ composite coating
CMAS corrosion
Interfacial reactions
Thermal barrier coating
CMAS corrosion
Al2O3-7YSZ composite coating
Thermal barrier coating
Interfacial reactions
ISSN:0955-2219
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Shrnutí:The calcium-magnesium-aluminum-silicate (CMAS) corrosion is now a great threat to thermal barrier coatings (TBCs), inducing coating spallation readily. The CMAS corrosion characteristics of both 7YSZ and 20 wt.%Al2O3-YSZ TBCs at a broad temperature range of 1250 °C to 1350 °C were investigated. 7YSZ coatings were completely degraded by CMAS at 1250 °C while the increased corrosion temperatures induced more serious destruction. This is due to that the viscosity of CMAS melt significantly decreased with corrosion temperature increasing, promoting melt fluidity and infiltration. The Al2O3-YSZ composite TBCs demonstrated superior resistance to CMAS corrosion at 1250°C-1350 °C. The intensive chemical reactions between Al2O3 and CMAS melt promoted the formation of anorthite products with either short rod-shaped or blocky morphologies. These products closely interconnected and stacked up to generate a dense layer, physically blocking CMAS melt infiltration and effectively improving the anti-CMAS corrosion properties of TBCs at higher temperatures. Furthermore, the corrosion temperatures critically influenced anorthite formation and present morphologies.
ISSN:0955-2219
DOI:10.1016/j.jeurceramsoc.2024.116789