CaO-MgO-Al2O3-SiO2 (CMAS) corrosion of Gd2Zr2O7 and Sm2Zr2O7

Wang, Honglong; Bakal, Ahmet; Zhang, Xingxing; Tarwater, Emily; Sheng, Zhizhi; Fergus, Jeffrey W.

doi:10.1149/2.0301610jes

Title: CaO-MgO-Al₂O₃-SiO₂ (CMAS) corrosion of Gd₂Zr₂O₇ and Sm₂Zr₂O₇

Journal Article · Mon Aug 08 00:00:00 EDT 2016 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.0301610jes· OSTI ID:1289513

Wang, Honglong ^[1]; Bakal, Ahmet ^[1]; Zhang, Xingxing ^[1]; Tarwater, Emily ^[1]; Sheng, Zhizhi ^[1]; Fergus, Jeffrey W. ^[1]

Auburn Univ., Auburn, AL (United States)

Ceramic thermal barrier coatings are applied to superalloys used in gas turbine engineering to increase the operating temperature and the energy conversion efficiency. However, dust consisting of CaO-MgO-Al₂O₃-SiO₂ (CMAS) from the air can be injected into the engines and corrode the thermal barrier coatings. Lanthanide zirconates are promising materials in thermal barrier coatings due to their low thermal conductivities, good phase stability and good corrosion resistance. However, the corrosion resistance mechanism of CMAS on lanthanide zirconates is still not clearly understood. In this work, the corrosion mechanism of Gd₂Zr₂O₇ and Sm₂Zr₂O₇ in CMAS is studied. Here, the results show that the CMAS can easily react with lanthanide zirconate thermal barrier coatings to form a dense layer, which can resist further corrosion

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Research Organization:: Auburn Univ., AL (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE), Clean Coal and Carbon Management

Grant/Contract Number:: FE0011245

OSTI ID:: 1289513

Journal Information:: Journal of the Electrochemical Society, Vol. 163, Issue 10; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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Cited By (1)

A novel CMAS‐resistant material based on thermodynamic equilibrium design: Apatite‐type Gd ₁₀ (SiO ₄ ) ₆ O ₃ Wu, Di; Zhang, Han; Shan, Xiao Journal of the American Ceramic Society, Vol. 103, Issue 5 https://doi.org/10.1111/jace.17019	journal	January 2020

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Title: CaO-MgO-Al₂O₃-SiO₂ (CMAS) corrosion of Gd₂Zr₂O₇ and Sm₂Zr₂O₇