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load were applied. Figure 2.1.27 shows the predicted stress levels in the three parts. The braze and transition pieces experience stress levels equivalent to their yield stress. A life prediction of the NT154 ceramic rotor stub was performed using the Weibull Modulus. Given a flexure strength of 131,500 psi at 70° F and a Weibull Modulus of 15, the probability that the ceramic stub will fail is 1 in 10,000. TZM (Mises stress) 95,260 psi Ceramic (Max.Prin. stress) 39,490 psi Braze (Mises stress) 42,890 psi Braze Stress Rotor Stub Figure 2.1.27 Brazed-Wedge attachment FEA results Transition Piece Several brazing trials were run to optimize UTRC’s high vacuum brazing furnace temperature cycle. Both TiCuSil ABA, and a proprietary gold based brazing material were used to make simple butt joints using silicon nitride rod stock. The actual attachment geometry is more complex than a simple butt joint – the purpose of the trials was to determine the exact temperature profiles needed for a successful braze. As seen in Figure 2.1.28, the TiCuSil ABA braze cycle has been optimized, while the gold based braze requires further refinement to avoid excessive melting. Testing of full scale rotor to metal hub attachments was not completed prior to the end of the design activity. 43PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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