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Licensed Unlicensed Requires Authentication Published by De Gruyter June 11, 2013

Internal stresses and phase stability in multiphase environmental barrier coatings

K. T. Faber , C. M. Weyant , Bryan Harder , Jonathan Almer and Kang Lee

Abstract

The use of silicon-based ceramics in power generation applications is limited by recession of the passivating SiO2 when it reacts with water-vapor to form a volatile hydroxide. Environmental barrier coatings are used to prevent diffusion of reactive species to the structural ceramic substrate. Often these barriers are multilayered and/or multiphase to provide optimal thermal expansion match, microstructural stability, as well as low diffusivities. High energy X-rays are used to assess internal stress as well as phase content and stability in two coating systems: alloyed Ta2O5 for Si3N4 and strontium-aluminosilicates for SiC/SiC. In particular, the role of phase transitions and precipitation on the coating internal stresses is evaluated along with their ramifications for coating lifetime.


* Correspondence address, Professor Katherine T. Faber, Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208 USA. Tel.: +1 847 491 2444, Fax: +1 847 491 7820, E-mail:

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Received: 2007-6-25
Accepted: 2007-9-4
Published Online: 2013-06-11
Published in Print: 2007-12-01

© 2007, Carl Hanser Verlag, München

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