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CHAPTER 6 FRABRICATION OF PROTECTIVE COATINGS BY SOL-GEL BASED METHOD 6.3 Preliminary Fabrication and Characterization of YSZ and Alumina Protective Coatings on TBC Top Coats After measurement of parameters and protective coatings fabrication on stainless steel, experiments of protective coatings were fabricated on the top of TBCs. The ideal thickness of protective coatings is in the range between 20 to 50 μm. 6.3.1 Fabrication and Characterization of YSZ Protective Coatings on TBC Top Coats For YSZ protective coating, the precursor is made from the mixture of trial 11 shown in Table 6.1 using sol-gel based spray coating. In order to reach the ideal thickness, 20 cycles of spraying and drying were proceeded followed by 1 hour ageing at 600 °C. Figure 6.6 shows the surface and cross-sectional images of YSZ overlay coated on the top of TBC top coat after 600 °C, and its EDX mapping results are shown in Figure 6.7. The composition of YSZ protective coating measured by EDX point analysis was shown in Table 6.4, the weight ratio of Y2O3 in protective coating is 8.72 wt.% which is not far from the weight ratio of YSZ top coat (8 wt.%). As shown in Figure 6.6, the thickness of YSZ protective coating is in the range between 20 to 30 μm. However, the surface and cross-sectional images demonstrates that the morphology of YSZ protective coating was too damaged to prevent volcanic ash or CMAS attack although the distribution of every element is balanced and the composition is close to ideal according to Page 85PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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