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List of Figures Figure 2.1 Cross-sectional SEM image of thermal barrier coating system......... 19 Figure 2.2 Coefficients of thermal expansion (CTEs) and thermal conductivities of materials for the principal components in TBC systems [1,3,11].................. 22 Figure 2.3 Phase diagram of YSZ [1,12] ............................................................ 22 Figure 2.4 Typical cross-sectional SEM microstructure of APS TBCs [19]......... 24 Figure 2.5 Schematic image of air-plasma spray processing system ................ 24 Figure 2.6 Typical cross-sectional SEM microstructure of EB-PVD TBCs [19] .. 26 Figure 2.7 Schematic image of electron-beam physical vapor deposition system ..................................................................................................................... 26 Figure 2.8 Cross-sectional image of TBC top coat penetrated by CMAS [42].... 32 Figure 2.9 Schematic image of cross-sectional engine turbine blade [33] ......... 33 Figure 2.10 Cross-sectional image demonstrates the complete suppression of CMAS melt ingression into the coating assembly [49] ................................. 37 Figure 2.11 (a) Cross-sectional image of APS top coat made by YSZ doping alumina and titanium oxide interact with CMAS, and (b) its EDS mapping of Si ..................................................................................................................... 38 Figure 2.12 Mechanism of CMAS/Gd2Zr2O7 interaction. (a) In early stage, CMAS/Gd2Zr2O7 react in TBCs columnar gaps, (b) columnar gaps are filled up with reaction products and the columnar tips just receive small attack from CMAS, (c) columnar tips is severely attacked by CMAS, (d) additional crystalline forms during cooling [60]............................................................. 40 Figure 4.1 SEM image of volcanic ash............................................................... 50 Figure 4.2 XRD pattern of volcanic ash ............................................................. 50 Figure 4.3 DTA curve for volcanic ash ............................................................... 52 Figure 4.4 (A) Surface image of volcanic ash and (B) its surface roughness after heat treatment at 1150 °C for 30 mins ......................................................... 52 Figure 4.5 (A) Surface image of volcanic ash and (B) its surface roughness after heat treatment at 1200 °C for 30 mins ......................................................... 53 LIST OF FIGURES Page 10PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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