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strengths and standard deviations of 785±52 and 737±40 MPa (114±7.5 and 107±5.8 ksi) respectively, roughly a 6% decrease in strength due to machining flaws but still within 10% of the nominal, as-processed strength value for AS800. 1000 800 600 400 200 0 20C-30 MPa/s 1204C-0.003MPa/s 1204-30 MPa/s Control AS800 AS800 w/o EBC AS800 w/ EBC Control SN88 SN88 w/o EBC SN88 w/ EBC AS800-Control AS800 w/ EBC AS800 w/o EBC 0 200 400 600 800 1000 Strength (MPa) Figure 12. EBCSiC coated AS800 bend bars @RT and 1204°C (2200°F). “w/EBC” and “w/oEBC” refer to strength calculation including or not thickness of coating – both conditions have EBC coating on silicon nitride. During the coating application process, the substrate is exposed to both elevated temperatures during processing and to a subsequent heat treatment in air. Measurements of as-processed surface after heat treatment in air showed a strength of 688 MPa (99.9 ksi) for a loss in strength of ~13% while the machined surface showed a loss of 17%. Measurements of the alumina grit blasted, as-processed condition after exposure to the heat treat conditions showed a strength of 613 ± 23 MPa (89.0 ± 3.4 ksi), a decrease of ~22% in strength. The same measurements made on alumina grit blasted specimens exposed to the heat-treat conditions in N2 showed a strength of ~730 MPa (~106 ksi) almost the same value as the grit blasted only condition. For the machined surface condition, alumina grit blasting plus heat treat in air resulted in a strength of 572 ± 43 MPa (83 ± 6.3 ksi), a 22.5% reduction in the machined surface strength, very similar to the as-processed surface condition. The effect of heat-treatment on the grit blasted, machined surfaces in N2 was not evaluated. The conclusion however is that although grit-blasting does cause some debit in Figure 11. EBCSiC coated AS800 and SN 88 bend bars @RT. “w/EBC” and “w/oEBC” refer to strength calculation including or not thickness of coating – both conditions have EBC coating on silicon nitride. As part of the coating application, grit blasting is used to clean the surface. Grit blasting the as- processed surface with either quartz, silicon, or alumina, all in the size range of 150 microns or finer, resulted in fracture strengths of ~847, ~834, ~and 756 MPa (~123, ~121, and ~110 ksi) respectively for roughly +8%, +7%, and -2% changes in strength, all still within 10% of the nominal as-processed strength value for AS800. For the machined surface condition, alumina grit blasting resulted in a strength of ~716 MPa (~ 104 ksi) again roughly a 2 to 3% decrease in strength or very similar results to the as- processed condition. 140 Copyright © 2004 by ASME Flexural Strength (MPa)PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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