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will scale similarly. The analysis suggests that the properties of the EBC can affect the stresses in vane also due to modulus mismatch. The transient analysis was performed on the vane using the boundary conditions provided by Solar Turbines. A stress free temperature of 1000°C (1832°F) was assumed for the transient analysis. The stresses during the transient heating are very similar (~344-351 MPa/~50-51 ksi) for with and without the EBC coating and the maximum stress occurs after 14 and 9 secs respectively. The maximum stress location is the trailing edge (close to mid-span). Figure 8 shows the temperature and stress variations with time. The corresponding steady state stresses were 260 and 245 MPa (37.8 and 35.5 ksi) for with and without the EBC. Interestingly, Solar Turbines reported failure of the coated vanes after ~15 s into the test and the predicted time at which maximum stress occurs during the transient matches the experimental proof test failure time very well. 2500 2000 1500 1000 500 55 50 45 40 35 30 25 20 15 No EBC (SiN Temp) With EBC (SiN Temp) With EBC (EBC Temp) No EBC (SiN stress) With EBC (SiN stress) Table 3. Effect of coating properties on stresses in vane and coating Figure 8. Maximum temperature and stress in EBC and SN282 silicon nitride (SiN) during the transient heat-up. COUPON-LEVEL PROPERTY CHARACTERIZATION AT ORNL Proof tested EBCSiC coated Solar Turbines vanes that had failed (Figure 9) and AS800 and SN282 coupons coated with the EBCSiC were submitted by Solar Turbines and UTRC to ORNL for mechanical property test evaluation to assess changes in strength as the result of application of the baseline EBCSiC coating. Figures 10-12 are data generated at ORNL based on RT testing of vane coupons and RT and elevated temperature testing of bend bar coupons respectively. Test results in all cases show a very significant debit of 60 to 70% in bend strength at RT due to application of the EBCSiC coating (“w/EBC” and “w/oEBC” refer to calculation of the fracture stress either by including the thickness of the EBC or not i.e., assumes whether or not the coating provides any load bearing contribution, however, in both cases the EBC coating is present on the silicon nitride). There is no significant difference in the debit whether the test coupon is fabricated from the vane or determined by use of a bend bar. For the 1204°C (2200°F) test conditions the debit appears to be reduced significantly especially for testing at a load rate of 30 MPa/s (4.4 ksi/s) where the debit is only ~10% assuming that the coating provides no load 0 5 10 15 20 25 30 Time (secs) Coating Properties Dense BSAS Porous BSAS Analysis Step APS to RT RT to operation APS to RT RT to operation Temperatures (F) Vane EBC RT RT 2352/1191 2413/1255 RT RT 2330/1194 2421/1254 Location of Max. Stress Coating Vane TE Coating Vane TE Max. Prin Stress (ks 23 - 25 37.8 12 - 13 33.4 Porous BSAS refers to coating with half the thermal conductivity and stiffness as dense BSAS. 138 Copyright © 2004 by ASME Temperature (F) Stress (ksi)PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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