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EVALUATION OF EBCSiC FOR SILICON NITRIDE Evaluation of the EBCSiC for Si3N4 involved using existing coating and process technology associated with the EBCSiC and then modifying and optimizing this technology for application to different gas turbine grades of silicon nitride (AS800, SN88, SN282). The EBCSiC coating is fully described in the literature [6-11]. It can be described generally as a two or three layer system on a silicon carbide monolith or composite substrate consisting of a bond coat layer of silicon, a top layer of an alkaline earth aluminosilicate based on strontium and barium with a celsian structure and an intermediate layer of mullite blended with the top layer composition (ref. Fig. 1). Processing of these systems is accomplished by thermal spray. Specimens of the EBCSiC coated AS800 silicon nitride were sent to Oak Ridge National Laboratory (ORNL) for exposure to the Keiser Rig for testing in 1.5 atm steam at 1200°C (2200°F) for 2000 hrs duration [11]. Readers are referred to Ref. 12 for details on the Keiser Rig facility which was used to measure the effectiveness of the EBC system as a steam/oxygen permeation barrier. Figure 2 shows a representation of the coated silicon nitride coupon after 1200°C (~2200°F) exposure. No oxidation of the silicon nitride surface was seen, very little silica formation had occurred on the surface of the silicon, and the EBCSiC coating remained relatively unaffected by the exposure. The through thickness cracks observed in Fig. 2 are present in the as-processed state and are caused by CTE mismatch between the coating and the substrate. Figure 2. EBCSiC coated AS800 post test ORNL Keiser rig – 2000hrs, 1200°C (2200°F), 1.5 atm steam showing no oxidation of AS800 surface [11]. BSAS Mullite+BSAS Si 133 Copyright © 2004 by ASME State of the art EBCSiC consisting of 3-layers; a Si Figure 1. bond coat, a blended intermediate layer and a top layer based on barium, strontium aluminosilicate (BSAS). MODELING OF SOLAR TURBINES VANE PROOF TEST The objective of this work was to predict the effect of the environmental barrier coating (EBC) on thermal stresses and life of Solar Turbines ceramic stationary gas turbine (CSGT) vanes for Centaur 50S engine exposed to proof testing. The work included finite element analysis (FEA) of the thermal gradients and the resulting stresses in CSGT vanes during steady state and transient proof testing conditions; life prediction of vanesPDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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