Advanced Oxide Material Systems for 1650 Deg. C Thermal/Environmental Barrier Coating Applications
Technical memorandum rept.
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH GLENN RESEARCH CENTER
Pagination or Media Count:
Advanced thermal and environmental barrier coatings TEBCs are being developed for low- emission SiCSiC ceramic matrix composite CMC combustor and vane applications to extend the CMC liner and vane temperature capability to 1650 degrees C 3000 degrees F in oxidizing and water-vapor-containing combustion environments. The advanced 1650 degrees C TEBC system is required to have a better high temperature stability, lower thermal conductivity, and more resistance to sintering and thermal stress than current coating systems under engine high-heat-flux and severe thermal cycling conditions. In this report, the thermal conductivity and water vapor stability of selected candidate hafnia-, pyrochlore-, and magnetoplumbite-based TEBC materials are evaluated. The effects of dopants on the materials properties are also discussed. The test results have been used to downselect the TEBC materials and help demonstrate the feasibility of advanced 1650 degrees C coatings with long-term thermal cycling durability.
- Coatings, Colorants and Finishes