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interlayer is effective in isolating the residual stress in the Si layer from the substrate. It has also been determined that the coating solutions for monolithic silicon nitride need to focus on non-line-of-sight- methods in order to coat integral components of relevance. Efforts are ongoing to demonstrate the environmental protectiveness of a complete coating system tailored for silicon nitride processed by non- line-of-sight methods. ACKNOWLEDGMENTS This work and the efforts leading to it would not have been possible without the guidance and support of the Office of Naval Research (ONR) – Dr. Dave Shifler and Dr. Steven Fishman; the Department of Energy (DOE) - Deborah Haught and Don Geiling. Thanks are due to Mark Bliek of Bolton Works, Bolton, CT and other United Technologies Research Center personnel: Tahany El-Wardany, Owen Donahue, Mark Herman, John Holowczak, Wayde Schmidt, Tom Lawton and Jodi Vecchiarelli. Thanks are also due to Beth Armstrong of Oak Ridge National laboratories for her insight and discussions on slurry stabilization. REFERENCES 1. Opila, E.J., and Hann R.E. Jr, 1997, “Paralinear Oxidation of CVD SiC in Water Vapor”, J. Am. Ceram. Soc., 80 (1), pp. 197- 205. 2. Opila, E.J., Fox, D.S., and Jacobson, N.S., 1997, “Mass Spectrometric Identification of Si-O-OH(g) Species from the Reaction of Silica with Water Vapor at Atmospheric Pressure”, J. Am. Ceram. Soc., 80 (4), pp. 1009-12 3. Opila E.J., Smialek, J.L., Robinson, R.C., Fox, D.S., and Jacobson, N.S., 1999, “SiC Recession Caused by SiO2 Scale Volatility under Combustion Conditions: II, Thermodynamcis and Gaseous-Diffusion Model”, J. Am. Ceram. Soc., 82 (7), pp. 1826-34. 4. Robinson, R.C., and Smialek, J.L., 1999, “SiC Recession Caused by SiO2 Scale Volatility under Combustion Conditions: I, Experimental Results and Empirical Model”, J. Am. Ceram. Soc., 82 (7), pp. 1817-25. 5. Smialek, J.L., Robinson, R.C., Opila, E.J., Fox, D.S., and Jacobson, N.S., 1999, “SiC and Si3N4 Recession Due to SiO2 Scale Volatility Under Combustor Conditions”, Adv. Composite Mater., 8, 1, pp.33-45. 6. Eaton, H.E., Linsey, G.D., More, K.L., Kimmel, J.B., Price, J.R., and Miriyala, N., 2000, “EBC Protection of SiC/SiC Composites in the Gas Turbine Combustion Environment”, ASME Paper GT-2000-631. 7. Eaton, H.E., and Linsey, G.D.; 2002, “Accelerated oxidation of SiC CMC’s by Water Vapor and Protection via Environmental Barrier Coating Approach”, J. Eur. Ceram. Soc, 22, pp 2741-2747. 8. More, K.L., Tortorelli, P.F., Walker, L.R., Kimmel, J.B., Miriyala, N., Price, J.R., Eaton, H.E., Sun, E.Y., and Linsey, G.D., 2002, “Evaluating Environmental Barrier Coatings on Ceramic Matrix Composites after Engine and Laboratory Exposures”, ASME Paper GT-2002-30630. 9. Miriyala, N., Kimmel, J., Price, J., More, K., Tortorelli, P., Eaton, H., Linsey, G., and Sun, E., 2002, “The Evaluation of CFCC Liners After Field Testing in a Gas Turbine –III”, ASME Paper GT-2002-30585. 10. Bhatia, T., Eaton, H.E., Sun,E.Y., Lawton T.H., and Vedula, V.R. “Advanced Environmental Barrier Coatings for SiC/SiC Composites”, , ASME GT2005-68241, Reno, 2005. 11.Sun, E., Eaton, H., Holowczak, J., and Linsey, G., 2002, “Development and Evaluation of Environmental Barrier Coatings for Silicon Nitride”, ASME Paper GT-2002-30628. 12. More, K.L., Tortorelli, P.F., and Walker, L.R., “Verification of an EBC’s Protective Capability by First-Stage Evaluation in a High Temperature, High-Pressure Furnace”, ASME Paper GT-2003-38923. 152 Copyright © 2007 by ASMEPDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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