Abstract
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. Moreover, 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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