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for (a) 5 hours and (b) 20 hours................................................................... 71 Figure 5.3 DTA curves of volcanic ash, Al2O3, and volcanic ash-Al2O3 mixture . 72 Figure 5.4 XRD spectra of volcanic ash-Al2O3 mixture before and after heat treatment at 410 °C, 525 °C, 1060 °C, and 1310 °C.................................... 72 Figure 5.5 CaO-SiO2-Al2O3 ternary phase diagram [43] .................................... 75 Figure 6.1 Schematic image of the sol-gel based coating method..................... 77 Figure 6.2 (A) Cross-sectional and (B) surface SEM image of YSZ coating made by Sol-gel based dip coating for 1 time on stainless steel substrate............ 81 Figure 6.3 (A) Cross-sectional and (B) surface SEM image of YSZ coating made by Sol-gel based dip coating for 5 times on stainless steel substrate .......... 81 Figure 6.4 (A) Cross-sectional and (B) surface SEM image of YSZ coating made by Sol-gel based spray coating for 6 times on stainless steel substrate ...... 81 Figure 6.5 Sol-gel based spray coating for 6 times on the stainless steel substrate ..................................................................................................................... 84 Figure 6.6 (a) Surface morphology and (b) cross-sectional image of YSZ protective coatings....................................................................................... 86 Figure 6.7 EDX mapping of YSZ protective coatings ......................................... 86 Figure 6.8 the (a) surface morphology and (b) cross-sectional image of Al2O3 protective coatings....................................................................................... 87 Figure 6.9 EDX mapping of Al2O3 protective coatings........................................ 87 Figure 6.10 Schematic image of the damage mechanism of protective coatings during thermal exposure .............................................................................. 88 Figure 7.1 schematic image of the new design of TBCs .................................... 92 Figure 7.2 Illustration of the YSZ/volcanic ash and Gd2Zr2O7/volcanic ash interaction [41] ............................................................................................. 93 LIST OF FIGURES Page 12PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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