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CHAPTER 6 FRABRICATION OF PROTECTIVE COATINGS BY SOL-GEL BASED METHOD top coat. 600 °C ageing for 1 hour was carried out after the last drying. Surface morphology and cross-sectional images of the alumina protective coating are shown in Figure 6.8. The average thickness of alumina protective coating is in the range between 10 to 20 μm. Following the same problem, alumina protective coating is not able to protect YSZ top coat from volcanic ash attack according to its damaged surface. Moreover, severe spallation was found in alumina protective coating, which will be explained in coming paragraph. Although EDX mapping and point analysis shown in Figure 6.9 and Table 6.5 demonstrate that the distribution and composition of alumina is even and close to ideal, the spalled surface structure is still not able to prevent volcanic ash attack. Figure 6.8 the (a) surface morphology and (b) cross-sectional image of Al2O3 protective coatings Figure 6.9 EDX mapping of Al2O3 protective coatings Page 87PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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