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CHAPTER 3 RESEARCH PROPOSAL calculated by determining the strongest peaks from each phase and comparing each peak intensities with their correlated max intensities (when they are in single phase situation) using Klug’s equation: ( I m1 i x ) A f= Im1ax2 1 I m1 i x A 1 − ( I m1 a x ) ( A 1 − A 2 ) (f1 = fraction of phase 1, Imix = intensity in mix situation, Imax = intensity in max situation, A= mass absorption coefficient) In this experiment, the peak selected for monoclinic phase ZrO2 is located at 28°(-1 1 1). And the peak selected for tetragonal phase ZrO2 is located at 30°(1 1 1) in its XRD pattern. 6. Sol-gel based synthesis of metal-oxide based protective coatings The final part of this research is making a protective coating on the top of TBCs using sol-gel based methods. YSZ and Al2O3 were chosen as the materials for protective overlays. And the ideal morphology for protective coatings is a dense overlay with thickness 20 - 50nm. Sols should be prepared first for both dip coating and spray coating. The sols for fabrication of YSZ protective coatings is made from the mixture of zirconium(III) chloride (ZrCl3), yttrium(III) chloride hexahydrate (YCl3∙6H2O) propylene oxide, and deionized water [66]. The sol of Al2O3 coatings is made from mixing aluminium chloride hexahydrate (AlCl3∙6H2O), and propylene oxide (CH3CHCH2O) into deionized water [67]. Page 47PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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