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Environmental Barrier Coatings for Ceramics and Ceramic CompositesOne key factor that limits the performance of current gas turbine engines is the temperature capability of hot section structural components. Silicon-based ceramics, such as SiC/SiC composites and monolithic Si3N4, are leading candidates to replace superalloy hot section components in the next generation gas turbine engines due to their excellent high temperature properties. A major stumbling block to realizing Si-based ceramic hot section components is the recession of Si-based ceramics in combustion environments due to the volatilization of silica scale by water vapor. An external environmental barrier coating (EBC) is the most promising approach to preventing the recession. Current EBCs are based on silicon, mullite (3A12O3-2SiO2) and BSAS (barium strontium aluminum silicate with celsian structure). Volatility of BSAS, BSAS-silica chemical reaction, and low melting point of silicon limit the durability and temperature capability of current EBCs. Research is underway to develop EBCs with longer life and enhanced temperature capability. Understanding key issues affecting the performance of current EBCs is necessary for successful development of advanced EBCs. These issues include stress, chemical compatibility, adherence, and water vapor stability. Factors that affect stress are thermal expansion mismatch, phase stability, chemical stability, elastic modulus, etc. The current understanding on these issues will be discussed.
Document ID
Document Type
Conference Paper
Lee, Kang N.
(NASA Glenn Research Center Cleveland, OH, United States)
Fox, Dennis
(NASA Glenn Research Center Cleveland, OH, United States)
Eldridge, Jeffrey
(NASA Glenn Research Center Cleveland, OH, United States)
Robinson, R. Craig
(NASA Glenn Research Center Cleveland, OH, United States)
Bansal, Narottam
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2004
Subject Category
Composite Materials
Meeting Information
Corrosion of Ceramic Matrix Composites, Workshop at the Conference: High Temperature Corrosion and Protection of Materials(Les Embiez)
Distribution Limits
Work of the US Gov. Public Use Permitted.

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