Abstract
Hot corrosion tests were conducted to investigate the reaction between CMAS glass and gadolinium zirconate (Gd2Zr2O7). Pyrochlore-type Gd2Zr2O7 bulk samples synthesized by a co-precipitation method and four compositions of CMAS were used in this study. The CMAS penetrated area includes two layers divided by a clear boundary: a reaction layer mainly composed of gadolinium silicate apatite and cubic fluorite-type phase and a transition layer which consists of a mixture of reaction products and unreacted CMAS and pyrochlore-type Gd2Zr2O7. The sample in contact with CaO-lean CMAS exhibited the most degradation with an infiltration depth of around 120 µm.
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