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Current Issues with Environmental Barrier Coatings for Ceramics and Ceramic CompositesThe environmental barrier coating (EBC) for SiC/SiC ceramic matrix composites and Si3N4 ceramics is an emerging field as the application of silicon-based ceramics in the gas turbine engine hot section is on the horizon, both for aero and industrial gas turbines. EBC is an enabling technology for silicon-based ceramics because these materials without an EBC cannot be used in combustion environments due to rapid surface recession. Significant progress in EBC development has been made during the last decade through various government-sponsored programs. Current EBCs are based on silicon, mullite (3Al2O3-2SiO2) and BSAS (barium strontium aluminum silicate with celsian structure). Volatility of BSAS, BSAS-silica chemical reaction, and low melting point of silicon limit temperature capability of current EBCs to about 1350 C for long-term applications. There is a need for higher temperature EBCs as the temperature capability of silicon-based ceramics continue to increase. Therefore, research is underway to develop EBCs with improved temperature capability compared to current EBCs. The current status and issues with the advanced EBC development efforts will be discussed.
Document ID
20050203991
Document Type
Conference Paper
Authors
Lee, Kang N. (Cleveland State Univ. Cleveland, OH, United States)
Date Acquired
September 8, 2013
Publication Date
January 1, 2004
Subject Category
Composite Materials
Meeting Information
International Symposium on New Frontier of Advanced Si-Based Ceramics and Composites(Geyongju)
Funding Number(s)
WBS: WBS 22-714-30-17
WBS: WBS 22-714-30-23
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.