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CHAPTER 5 CHARACTERIZATION OF PROTECTIVE COATING MATERIALS Chapter 5 Characterization of Protective Coating Materials In order to prevent the direct attack of volcanic ash on TBC top coat, YSZ and Al2O3 protective coatings were fabricated on TBCs. Before the fabrication started, the capabilities of YSZ and Al2O3 protective coatings against volcanic ash were carried out and will be discussed on in this section. 5.1 Reaction and Permeability of Volcanic Ash in YSZ and Alumina Plates In this study, YSZ and Al2O3 plates were operated to simulate the ideal protective coatings, which were expected to be dense and impermeable. Ideal YSZ protective coatings were simulated by YSZ plates cut from an 8YSZ ingot. For the ideal Al2O3 protective coating, an α-phase alumina plates of purity 99.9% was simulated. Volcanic ash was placed on the surface of these two different plates with a concentration of 20 mg/cm2, and heat treated at 1250 °C for 5 and 20 hours. SEM and EDX were utilized to characterize their microstructure and chemical morphology, and understand their ability against volcanic ash degradation. To systematically study the protective effect of protective coatings, reactions and permeability of volcanic ash in YSZ and alumina plates were carried out. The Page 69PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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