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Table III: Profilometry of Dense Rotor Surfaces Several properties were measured on dense co-processed tiles to help ensure the quality of the rotors. These properties (Table IV), with the exception of rotor density, were destructive in nature and therefore could not be completed on the rotors. The data shown in Table IV is for the six rotors that were suitable for delivery to United Technologies. The rotor densities are fairly consistent and typical for NT154. The robust process used helps to maintain this consistency. The data on the co-processed tiles did have some variation although the values are within the range for the material. Table IV: Rotor and Co-processed Tile Final Properties *Toughness by indentation crack length method **Four point flexure (ASTM C1161-2002) ***Value is co-processed tile in a separate HIP crucible The six rotors, shown in Table IV, have been delivered to United Technologies (UTRC). UTRC plans to spin test the rotors to a pre-determined proof test speed. If the rotor survives, UTRC may apply its current Environmental Barrier Coating (EBC) and re-spin the coated rotor. The objective would be to evaluate the integrity of the coating and determine any residual stresses that it may impart on the base rotor. Ra (μ-in) Rt (μm) Blades 2nd and 3rd Planes Bottom Face Bottom Shaft Blades 2nd and 3rd Planes Bottom Face Bottom Shaft 154-33B-MT3 154-33B-MT4 154-33B-MT5 55 not measured not measured 35 34 46 13 9 9 11 154-37B-MT1 154-38B-MT1 154-38B-MT2 52 58 73 42 52 96 51 57 79 11 14 18 8 9 20 13 15 23 154-39B-MT1 154-39B-MT2 52 80 52 58 104 78 13 19 14 13 25 21 Co-Processed Tiles Rotor Density Toughness* Room Temperature 1200C Flexural Phase Analysis (g/cc) (MPa-m1/2) Flexural Strength (MPa)** Strength (MPa)** %β-Si3N4 154-33B-MT3 154-37B-MT1 3.230 3.217 5.53 4.28 901 839 554 593 94 79 154-38B-MT1 154-38B-MT2 3.220 3.224 4.52 4.04 812 973 592 666 89 89 154-39B-MT1 154-39B-MT2 3.224 3.220 4.39 4.39*** 891 947 615 719 72 76 122PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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