Effect of CMAS composition on hot corrosion behavior of gadolinium zirconate thermal barrier coating materials

Deng, Wenzhuo; Fergus, Jeffrey W.

doi:10.1149/2.0531709jes

Title: Effect of CMAS composition on hot corrosion behavior of gadolinium zirconate thermal barrier coating materials

Journal Article · Thu Jul 06 00:00:00 EDT 2017 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.0531709jes· OSTI ID:1372487

Deng, Wenzhuo ^[1]; Fergus, Jeffrey W. ^[1]

Auburn Univ., Auburn, AL (United States)

The resistance of synthesized pyrochlore-type Gd₂Zr₂O₇ bulk specimens to four calcium-magnesium aluminosilicate (CMAS) compositions at different temperatures was investigated. The reaction products were identified by x-ray diffraction and penetration depths were examined using scanning electron microscopy. A dense reaction layer is comprised mainly of Ca₂Gd₈(SiO₄)₆O₂ and a cubic fluorite phase formed during the CMAS attack, and some unreacted CMAS was found in a transition layer below the reaction layer. The overall infiltration depth changed slightly with temperature, however, the thickness of the reaction layer and the morphology of the transition layer varied distinctly with temperature. The sintered sample underwent the most severe degradation by the CaO-lean CMAS, whereas the effect of CaSO₄ and CaCO₃ was not significant. Furthermore, the Gd content of the ZrO₂-based cubic fluorite phase depends on the temperature and the molar ratio of Ca:Si in the CMAS.

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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:: 1372487

Journal Information:: Journal of the Electrochemical Society, Vol. 164, Issue 9; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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36 MATERIALS SCIENCE
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Gd2Zr2O7
pyrochlore
thermal barrier coatings

Title: Effect of CMAS composition on hot corrosion behavior of gadolinium zirconate thermal barrier coating materials

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