4.4 Ceramic Matrix Composite (CMC) Combustor Liner A significant challenge in achieving ultra-low NOx combustor goals is the development of advanced high-temperature combustor liner materials requiring little or no film air cooling. Add to this requirement a combustor life goal of 18,000 hours, and you have a major durability challenge. NASA's High Speed Research (HSR) program has developed an advanced silicon-carbide-fiber-reinforced silicon carbide (SiC/SiC) Ceramic Matrix Composite (CMC) as a promising liner material for an advanced, ultra-low NOx combustor. Various enabling technologies contributed to the successful development of a CMC liner material. These include development of (1) advanced silicon carbide fiber with high-temperature stability, (2) a new fiber coating, (3) a new fabrication technique for producing dense composites, and (4) an environmental barrier coating for preventing surface recession. Further development of CMC liners for higher temperature and pressure capabilities will lead to applications in a wide range of low-emission combustor designs. This CMC material has demonstrated a greater than 9000-hour life at 2200 degrees Fahrenheit in laboratory test cycles typical of aircraft engines. NASA POC: Dr. Ajay K. Misra 216-433-8193 Ajay.K.Misra@grc.nasa.gov

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