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strength, a subsequent heat treatment in furnace air results in much higher reduction in the strength of AS800 silicon nitride. The role of fluence in grit blasting was also examined in this study. Fluences at 150 m/s (492 f/s) impact velocity ranging from 14.2 g/cm2 to 426 g/cm2 produced no significant variation in strength debit for either the condition of grit blasting alone or for grit blasting plus heat treatment. Figure 13 shows the effects of grit blasting fluence on normalized bend strength. 1.10 1.05 1.00 0.95 0.90 0.85 0.80 0.75 0.70 500 Figure 13. Effects of grit blast (GB) fluence (gm/cm2) on strength of AS800. The next set of experiments was performed to study the effects of the EBC layers on strength of AS800. Application of 125 microns of silicon metal to a grit blast surface of the AS800 and using a subsequent 1250°C (2285°F)/24 hr heat treat in air resulted in a strength of 310 MPa (45 ksi) for the as-processed surfaces and 317 MPa (46 ksi) for the machined surfaces representing roughly a 60% reduction in non-EBC coated strength and roughly a 50% decrease in strength over the grit blasted and heat treated values. Strength of the AS800 having the three-layer EBC was approximately the same value at 317 MPa (46 ksi). There was no significant effect due to increasing the thickness of silicon layer to 250 microns or due to the effect of the silicon layer plus only the intermediate layer. Figure 14 is a Weibull plot of the room temperature strength of uncoated and coated AS800 in four point bending. 10 1 0.1 0.01 10 100 1000 Stress (ksi) Figure 14. Weibull plot of uncoated and coated AS800. Baseline refers to uncoated AS800 strength data, and the other data refer to various coated samples. SUMMARY The effectiveness of the EBCSiC on silicon nitride was studied and it is concluded that while the EBC provided adequate environmental protection, the CTE mismatch caused room temperature substrate strength degradation that is presently unacceptable for the components considered. The study was based on structural analysis and life prediction performed on Solar Turbines vanes to understand the mechanical behavior of coated silicon nitride components. In summary, tests of silicon nitride gas turbine components showed a limited applicability of EBCs that were developed for silicon carbide composites to silicon nitride components. It demonstrates the need for the development of new coating systems specifically tailored to silicon nitride. ACKNOWLEDGMENTS This work and the efforts leading to it would not have been possible without the guidance and support of the Office of Naval Research (ONR) - Dr. Steven Fishman; the Department of Energy (DoE) Power Technologies - Deborah Haught and Steven Waslo; and the National Air and Space Administration (NASA) – Dave Brewer, o Weibull Modulus = 21.4 coated Si Debit with Si layer alone =~50% Debit with all 3 layers Weibull Modulus = 14.88 Si 125 micron Si 250 micron Si 125 micron + mixed 3 layer std w/ 125 micr 3 layer w/ 250 micron S Uncoated baseline ~ 50% Si3N4 with various coating layers grit blast alone grit blast plus heat treat 0 100 200 GB fluence gm/cm2 300 400 141 Copyright © 2004 by ASME Normalized strength Ln(1/1-P))PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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