Abstract
In a previous study, the strength of the interface between an environmental barrier coating (EBC) and the substrate was measured at ambient temperature using a unique compression test methodology. In this study, the method was extended for elevated temperature characterization of the strength of this interface. The extension of the method also allowed for the characterization of the elevated temperature toughness ofthe EBC/substrate interface. An essential component of measuring elevated temperature interface strength and toughness was characterization of the elevated temperature elastic modulus of the EBC coating layers. The elastic moduli of EBC layers were characterized at both ambient and at elevated temperature. The results point to a substantial decrease in the moduli of the EBC coating layers at elevated temperature. Preliminary results also indicate a decrease in both the strength and toughness of the EBC/substrate interface at elevated temperatures compared to ambient temperature.
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