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Environmental Barrier Coatings for Monolithic Silicon Nitride: Bond Coat Development

[+] Author Affiliations
Tania Bhatia, G. V. Srinivasan, Sonia V. Tulyani, Robert A. Barth, Venkat R. Vedula, William K. Tredway

United Technologies Research Center, East Hartford, CT

Paper No. GT2007-27685, pp. 281-288; 8 pages
  • ASME Turbo Expo 2007: Power for Land, Sea, and Air
  • Volume 1: Turbo Expo 2007
  • Montreal, Canada, May 14–17, 2007
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4790-X | eISBN: 0-7918-3796-3
  • Copyright © 2007 by ASME


Environmental barrier coatings (EBCs) are being developed for silicon carbide (SiC) based composites and monolithic silicon nitride (Si3 N4 ) to protect against the accelerated oxidation and subsequent silica volatilization in high temperature high-pressure steam environments encountered in gas turbine engines. It has been found that the application of EBCs developed for SiC-based composites (EBCSiC ) to monolithic silicon nitride results in a loss of room temperature mechanical strength of the monolithic substrate. In this paper, we discuss the development of a bond coat system tailored for monolithic silicon nitride that helps retain the strength of the substrate. Some of the unique requirements and challenges associated with the processing of non-line-of-sight EBCs for Si3 N4 will also be discussed. Preliminary results from coating of airfoils will be presented.

Copyright © 2007 by ASME



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