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CHAPTER 6 FRABRICATION OF PROTECTIVE COATINGS BY SOL-GEL BASED METHOD 6.2 Aluminaprotectivecoatings Alumina protective coating can effectively protect YSZ top coat from CMAS degradation. According to the literature review [67], it is not possible for alumina coatings to prohibit the CMAS penetration. However, after chemical reaction between the two, their reaction product, anorthite, magnetite, and spinel stay in the CMAS/Al2O3 interface. With higher melting temperature than CMAS, these reaction products block the pathway of CMAS penetration. 6.2.1 Precursor for alumina coatings The precursor of alumina coating is made from mixing aluminium chloride hexahydrate (AlCl3∙6H2O) and propylene oxide added into deionized water which chemical formula can be presented as: AlCl3∙6H2O + AlOH2+ + 2+ further reaction AlOH → Al2(OH)3 heating Al2(OH)3 → Al2O3 + H2O(g) For the precursor of Al2O3 coatings, it was really hard to find an optimized solution because the propylene oxide effect was not as clear as in sol-gel YSZ protective coatings fabrication for alumina precursor fabrication. As shown in Table 6.2, the gelation time was really long and unpredictable because unlike sol-gel YSZ coatings fabrication, great amount of propylene oxide was added into Page 82PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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