Reaction Mechanism of CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) Corrosion in Pyrochlore Thermal Barrier Coatings

Higher working temperatures improves the energy conversion efficiency in gas turbine engines so thermal barrier coatings are applied to protect the blades to increase the operating temperature.  However, CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) from volcanic ash and other debris can lead to corrosion of the c...

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Published inMeeting abstracts (Electrochemical Society) Vol. MA2015-01; no. 13; p. 1126
Main Authors Wang, Honglong, Sheng, Zhizhi, Agubra, Victor, Zhang, Xingxing, Tarwater, Emily, Fergus, Jeff W.
Format Journal Article
LanguageEnglish
Published 29.04.2015
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Summary:Higher working temperatures improves the energy conversion efficiency in gas turbine engines so thermal barrier coatings are applied to protect the blades to increase the operating temperature.  However, CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) from volcanic ash and other debris can lead to corrosion of the coating. Rare earth zirconates with the pyrochlore structure are promising thermal barrier materials due to their low thermal conductivity and better corrosion resistance compared to the common thermal barrier material, yttria stabilized zirconia (YSZ). CMAS reacts with the pyrochlore materials to form cubic fluorite and silicate phases which can inhibit the corrosion process. In this presentation, Gd 2 Zr 2 O 7 and Sm 2 Zr 2 O 7 were used to study the corrosion mechanism of CMAS on pyrochlore materials.
ISSN:2151-2043
2151-2035
DOI:10.1149/MA2015-01/13/1126