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CHAPTER 6 FRABRICATION OF PROTECTIVE COATINGS BY SOL-GEL BASED METHOD [M(H2O)x]n+ + A- + (n-1)+ [M(OH)(H2O)x-1](n-1)+ + → M(OH)n [M(OH)(H2O)x-1] further reaction heating M(OH)n → MO(n/2) + H2O(g) By ring-opening (propylene oxide), hydrolysis, and heating, metal oxides would form as reaction products [76,77]. For YSZ precursor, it was made by the mixture of zirconium(IV) chloride (ZrCl4), yttrium(III) chloride hexahydrate (YCl3∙6H2O), propylene oxide (C3H6O) and deionized water [66] which formulas are shown as followed: ZrCl4 + YCl3∙6H2O + ZrOH3+ + YOH2+ ZrOH 3+ 2+ further reaction + YOH → Zr(OH)4·Y2(OH)3 heating Zr(OH)4·Y2(OH)3 → ZrO2·Y2O3 + H2O(g) Table 6.1 shows the parameters of all experimental trials for the preparation of YSZ precursors. The volume of propylene oxide was varied in order to produce an optimized precursor for the preparation of YSZ coatings. From the experiments, two phenomena were observed. The first one was found by comparing trial 9 to trial 11. It could be noted that the gelation time was highly affected by the composition of propylene oxide. The gelation time could be significantly shortened even by adding 0.5 ml of additional propylene oxide into Page 78PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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