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Strength and Toughness of Interface Between EBC and Ceramic Substrates at Elevated Temperature

[+] Author Affiliations
Shanti Nair

University of Massachusetts, Amherst, MA

Ellen Y. Sun

United Technologies Research Center, East Hartford, CT

Paper No. GT2003-38918, pp. 643-648; 6 pages
doi:10.1115/GT2003-38918
From:
  • ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
  • Volume 1: Turbo Expo 2003
  • Atlanta, Georgia, USA, June 16–19, 2003
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3684-3 | eISBN: 0-7918-3671-1
  • Copyright © 2003 by ASME

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.

Copyright © 2003 by ASME

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