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CHAPTER 3 RESEARCH PROPOSAL To better understand the ability of protective coatings against volcanic ash, dense alumina and YSZ plates were used to simulate the ideal fully-dense YSZ and alumina protective coatings. In this study, great amount of volcanic ash was put on the top of alumina and YSZ plates, and heat-treated to observe the penetration depth of volcanic ash in different materials. SEM and EDX mapping were used to determine the penetration depth of volcanic ash in alumina and YSZ plates. 4. DTA analysis of volcanic ash and YSZ/Al2O3 DTA was used to determine the reactivity between volcanic ash-YSZ, and volcanic ash-Al2O3 in different temperatures. For volcanic ash-YSZ DTA analysis, the purpose is trying to find out the chemical reaction and phase transformation at different temperatures and understanding the mechanisms of CMAS penetration. On the other hand, according to the result of volcanic ash-Al2O3 DTA analysis, chemical reaction temperatures will be obtained and the melting point of reactants and reaction products might also be determined. For this series of experiments, samples were prepared by 1:1 weight ratio of volcanic ash and YSZ/Al2O3, and the heating profile was set from room temperature to 1480 °C (instrument limit) with the heating rate 10 °C per minute was set from. 5. XRD analysis of volcanic ash-YSZ mixture and volcanic ash-Al2O3 After DTA analysis, the reaction products of volcanic ash-YSZ and volcanic ash-Al2O3 were measured using XRD analysis. For volcanic ash-YSZ XRD Page 45PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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