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Premixer Ceramic Liner Figure 2.2.2 Cross-section of tapered ceramic combustor liner Liner prototype and fabrication requests for quotes were issued to manufacturers. Based on responses received the Silicon Nitride AS800 material was ruled out as prohibitively expensive. Design modifications were effected to allow use of lower strength, more affordable ceramic materials. After verification of material properties at ORNL it was concluded that both the SiC material from St. Gobain and the Si-SiC material from CoorsTek are suitable materials for the liner. A very low cost Si-SiC material was determined to have both lower strength and poorer strength distribution, which resulted in unacceptable calculated probability of failure. Silicon-based ceramics exhibit accelerated oxidation and material recession in the combustion environment due to the presence of water vapor. An environmental barrier coating (EBC) is required for long term applications. EBC technology for silicon carbide base composite materials has been developed under the NASA/EPM program and scaled up and demonstrated on a Solar Turbines Centaur 50S engine for over 27,000 hours under the DOE-sponsored CSGT program. A slightly different coating process was used to apply EBC to the ID of the ST5+ combustor liner due to the small diameter of the part (5.8”). Preliminary coating tests showed that a modified EBC process could be applied successfully to the combustor liner. EBC deposited using the standard process is shown on the left of Figure 2.2.3 while a coating deposited using the modified process is shown on the right. Figure 2.2.3 EBC coating - standard process (left) and modified process (right) 50PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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