Plasma-sprayed mullite and mullite/yttria-stabilized-zirconia (YSZ) dual layer coatings have been developed to protect silicon-based ceramics from environmental attack. Mullite-based coating systems show excellent durability in air. However, in combustion environments, corrosive species such as molten salt or water vapor penetrate through cracks in the coating and attack the Si-based ceramics along the interface. Thus the modification of the coating system for enhanced crack-resistance is necessary for long-term durability in combustion environments. Other key durability issues include interfacial contamination and coating/substrate bonding. Interfacial contamination leads to enhanced oxidation and interfacial pore formation, while a weak coating/substrate bonding leads to rapid attack of the interface by corrosive species, both of which can cause a premature failure of the coating. Interfacial contamination can be minimized by limiting impurities in coating and substrate materials. The interface may be modified to improve the coating/substrate bond. [S0742-4795(00)03203-8]
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October 2000
Technical Papers
Key Durability Issues With Mullite-Based Environmental Barrier Coatings for Si-Based Ceramics
Kang N. Lee
Kang N. Lee
Chemical Engineering Department, Cleveland State University, Cleveland, OH 44115
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Kang N. Lee
Chemical Engineering Department, Cleveland State University, Cleveland, OH 44115
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Indianapolis, IN, June 7–10, 1999; ASME Paper 99-GT-443. Manuscript received by IGTI March 9, 1999; final revision received by the ASME Headquarters May 15, 2000. Associate Technical Editor: D. Wisler.
J. Eng. Gas Turbines Power. Oct 2000, 122(4): 632-636 (5 pages)
Published Online: May 15, 2000
Article history
Received:
March 9, 1999
Revised:
May 15, 2000
Citation
Lee, K. N. (May 15, 2000). "Key Durability Issues With Mullite-Based Environmental Barrier Coatings for Si-Based Ceramics ." ASME. J. Eng. Gas Turbines Power. October 2000; 122(4): 632–636. https://doi.org/10.1115/1.1287584
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