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Final Analysis Once completed, the dense rotors (Figure 2) and co-processed tiles were fully characterized. Microfocus x-ray was completed on rotor 154-33B-MT3 only and showed no signs of cracking. As mentioned previously, there were blade chipping issues with a few of the rotors in the green state, caused by handling during processing. These defects are shown in Figure 2. Dimensional measurements were completed by CMM to determine final dimensions and average shrinkage experienced during densification (Table II). Based on the data, the dimensions of the eight dense rotors deviated by up to ±0.014”. The average linear shrinkage, which factored in many dimensional measurements, saw a variation of ±0.23% across the eight rotors. It is expected that the variation can be tightened in the future by improved powder control and larger powder batch sizes. Table II: CMM on Dense Radial Microturbine Rotors The surface finish of the as-processed dense rotors was measured with profilometry using a 10μm stylus and 8mm path lengths (Table III). The measurements followed the same procedure as used on the green rotors. Particular attention should be paid to the surface finish of the blade surfaces. Up to four blade paths and four blades were measured per rotor. The average blade surface roughness was generally in the 50-60μin range with two rotors being outside that range . Actual (Inches) Maximum Part-to-Part Nominal (Inches) 154-33B-MT3 154-33B-MT4 154-33B-MT5 154-37B-MT1 154-38B-MT1 154-38B-MT2 154-39B-MT1 154-39B-MT2 Variation (Inches) Total Height Blade Underside Plane Height Top Shaft OD Bottom Shaft OD Blade Tip OD 3.085 1.199 0.394 0.787 3.870 3.086 1.198 0.392 0.787 3.894 3.084 1.195 0.393 0.786 3.890 3.069 1.192 0.392 0.784 3.882 3.080 1.199 0.394 0.787 3.890 3.077 1.197 0.393 0.785 3.877 3.076 1.200 0.394 0.785 3.879 3.067 1.194 0.393 0.785 3.867 3.065 1.194 0.393 0.784 3.865 ±0.010 ±0.004 ±0.001 ±0.002 ±0.014 Offset Between Top Shaft and Blade Tip OD Offset Between Bottom Shaft and Blade Tip OD 0.000 0.000 0.001 0.004 0.002 0.001 0.001 0.001 0.001 0.002 0.000 0.001 0.001 0.003 0.003 0.002 0.004 0.001 Blade Tip OD Roundness Blade Underside Plane Flatness 0.000 0.000 0.002 0.002 0.006 0.005 0.001 0.002 0.002 0.002 0.000 0.000 0.001 120PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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