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CHAPTER 7 CONCLUSIONS AND SUGGESTED FUTURE WORK In literature, doping alumina into TBC columns has been done by Drexler et al. and shows a good effect against volcanic ash and CMAS [38,41]. For my idea, CMAS and volcanic ash degradation could be mitigated by modifying the top coat structure. Figure 7.1 is the schematic image of the new design of TBCs. In order to avoid the thermal expansion mismatch between YSZ columnar gap and the protective coating, the protective coating could be coated directly on the top of each YSZ columns using EB-PVD method, which can not only avoid the thermal mismatch from columnar gap but also strongly improves the adhesion. However, thermal expansion mismatch between YSZ top coat and protective material, coating technology, and the cost are still needed to be considered. Figure 7.1 schematic image of the new design of TBCs II. New materials against volcanic ash According to the literature review [53], gadolinium zirconate (Gd2Zr2O7) provides a good volcanic ash resistance. Fig 7.2 is the illustration of the YSZ/volcanic ash and Gd2Zr2O7/volcanic ash interaction. Unlike YSZ, Gd2Zr2O7 provides a really good volcanic ash resistance, their reaction products will stay in Page 92PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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