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TECHNICAL PAPERS: Gas Turbines: Ceramics

Key Durability Issues With Mullite-Based Environmental Barrier Coatings for Si-Based Ceramics

[+] Author and Article Information
Kang N. Lee

Chemical Engineering Department, Cleveland State University, Cleveland, OH 44115

J. Eng. Gas Turbines Power 122(4), 632-636 (May 15, 2000) (5 pages) doi:10.1115/1.1287584 History: Received March 09, 1999; Revised May 15, 2000
Copyright © 2000 by ASME
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References

Figures

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Mullite/Mo Silicide/YSZ-coated SiC after 500 h with 2 h cycles at 1300 °C in 90 percent H2O/O2
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Mullite/YSZ-coated SiC after 500 h with 2 h cycles at 1300 °C in air
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Mullite/YSZ-coated RBSN after 50 h at 1300 °C in air
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Weight change versus time for coated and uncoated SiC in HPBR (6 atm, 1230 °C)
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Mullite-coated SiC after 50 h in HPBR (6 atm, 1230 °C)
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Mullite/YSZ-coated SiC exposed to 2 h cycle exposure in 90 percent H2O/O2 at 1300 °C; (a) 100 h; (b) 200 h.
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Mullite/YSZ-coated SiC after 100 h with 2 h cycles in 90 percent H2O/O2 at 1250 °C. The SiC coupon was oxidized for 100 h in air at 1300 °C prior to the application of coating.
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Mullite-coated SiC coupon after 50 h in hot corrosion rig at 1000 °C
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Mullite/Cordierite-coated SiC after 600 h with 20 h cycles at 1200 °C in air

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