Volcanic Ash Degradation on Thermal Barrier Coatings

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Volcanic Ash Degradation on Thermal Barrier Coatings ( volcanic-ash-degradation-thermal-barrier-coatings )

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CHAPTER 6 FRABRICATION OF PROTECTIVE COATINGS BY SOL-GEL BASED METHOD Figure 6.1 Schematic image of the sol-gel based coating method 6.1 YSZprotectivecoatings A dense YSZ protective coating is the first idea for mitigating CMAS/volcanic ash attack. During the interaction of CMAS/YSZ protective overlay, YSZ protective overlay is treated as a sacrificial layer, which not only blocks the pathway of CMAS penetration, but also prevents the interaction of CMAS/YSZ top coat directly. The research procedure is shown as follows. 6.1.1 Precursor for YSZ coatings For the fabrication of a protective coating using a sol-gel based approach, it is necessary to determine the gelation time in the beginning. In this experiment, the reactions of solutions are followed from the formulas showing below: Page 77

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