"A New Class of Creep Resistant Oxide/Oxide Ceramic Matrix Composites"
Despite recent progress in the development of SiC-SiC ceramic matrix composites (CMCs), their application in industrial gas turbines for distributed energy (DE) systems has been limited. The poor oxidation resistance of the non-oxide ceramics warrants the use of envrionmental barrier coatings (EBCs), which in turn lead to issues pertaining to life expectancy of the coatings. On the other hand, oxide/oxide CMCs are potential replacements, but their use has been limited until now due to the poor creep resistance at high temperatures, particularly above 1200 oC: the lack of a creep resistant matrix has been a major limiting factor. Using yttrium aluminum garnet (YAG) as the matrix material system, we have advanced the state-of-the-art in oxide/oxide CMCs by introducing innovations in both the structure and composition of the matrix material, thereby leading to high temperature matrix creep properties not achieved until now. An array of YAG-based powders with a unique set of particle characteristics were produced in-house and sintered to full density and compressive creep data was obtained. Aided in part by the composition and the microstructure, the creep rates were found to be two orders of magnitude smaller than the most creep resistant oxide fiber available commercially. Even after accounting for porosity and a smaller matrix grain size in a practical CMC component, the YAG-based matrix material was found to creep slower than the most creep resistant oxide fiber available commercially.
- Research Organization:
- NEI Corporation, Somerset, NJ (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); EE-10
- DOE Contract Number:
- FG02-06ER84560
- OSTI ID:
- 927776
- Report Number(s):
- DOE/ER/84560-Z; NEI 43047; TRN: US201006%%463
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ALUMINIUM
CERAMICS
COATINGS
CREEP
FIBERS
GARNETS
GAS TURBINES
GRAIN SIZE
MATRIX MATERIALS
MICROSTRUCTURE
OXIDATION
OXIDES
POROSITY
YTTRIUM
Yttrium aluminum garnet (YAG)
Creep Rate
Ceramic Matrix Composite
Oxide-Oxide CMC
Distributed Energy System
Gas Turbine Engine
Lifetime
Powder Processing