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(a) (b) Figure 10: Slurry coated SN282 blade. (a) Before and (b) After burner rig testing to 2400 F (50 cycles) When integral vane rings or rotors were dipped, the drip issues were found to be much less severe than in the single blade. It was decided to focus scale-up on the integral components since they are more relevant to the ongoing programs at UTRC. A dip coated integral rotor before firing is shown in Figure 11. Another particular dip trial on an integral vane ring prototype similar to one described in figure 1 is shown in figure 12. It can be seen from the figure that the airfoils and platforms have fairly uniform coverage with the coating. In order to understand the variability of coating thickness on the component and “quantify” coating quality, a white light fringe projection technique (described in reference 20) was used extensively to map the contours of the component before and after coating application. This was used to map coating thickness in the different areas of the component. The areas in the fillets were found to be particularly difficult to coat adequately. Efforts are ongoing to improve slurry characteristics to improve coating coverage to achieve uniform coatings. Figure 11: Integrally bladed NT154 microturbine rotor after dip coating in an oxide slurry. 151 Copyright © 2007 by ASME Figure 12: Coating of integral vane ring to demonstrate scalability of the process SUMMARY A new bond coat system consisting of a low modulus ceramic inter layer and a CVD Si layer helps retain the baseline strength of monolithic silicon nitride. It has been found that the coating does not adversely affect the pre-existing flaws in silicon nitride and thePDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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