EBC Protection of SiC/SiC Composites in the Gas Turbine Combustion Environment: Continuing Evaluation and Refurbishment Considerations

摘要: Silicon carbide fiber reinforced silicon composites (SiC/SiC CMC’s) are attractive for use in gas turbine engines as combustor liner materials because the temperature capability allows reduced cooling. This enables engine to operate more efficiently and design of very stringent emission goals NOx CO. It has been shown, however, that SiC/SiC CMC’s other silica formers can degrade with time high steam environment due accelerated oxidation subsequent volatilization reaction pressure water (ref.s 1, 2, 3, & 4). As a result, an environmental barrier coating (EBC) is required conjunction CMC order meet long life goals. Under U.S. Department Energy (DOE) sponsored Solar Turbines Incorporated Ceramic Stationary Gas Turbine (CSGT) program (ref. 5), EBC systems developed under HSCT EPM improved CSGT have applied both coupons combustion liners which evaluated term laboratory testing ground based power generation. paper discusses continuing evaluation (see ref. 6) application results from test evaluations along refurbishment considerations.Copyright © 2001 by ASME