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CHAPTER 3 RESEARCH PROPOSAL analysis, in order to get more understand for volcanic ash-YSZ reaction, 2 samples were made for this experiment. The first sample was made from powder mixture of volcanic ash and YSZ mixed in 1:1 weight ratio were prepared, and the other sample was pure YSZ powder which made as a comparison. After sample preparation, heat treatments proceeded from room temperature to different target temperatures with a heating rate 10 °C per minute. Upon reaching the target temperature, samples were held at target temperature for 3 minutes for better reactions. The target temperatures were chosen from the peaks and valleys shown in DTA curves. In volcanic ash-YSZ system, peaks and valleys were located at 490 °C, 950 °C, 1160 °C, and 1350 °C chosen from the peaks and valleys shown in DTA curve. For the sample preparation of volcanic ash-Al2O3, it is the same with volcanic ash-YSZ. The sample was made from powder mixture of volcanic ash and Al2O3 mixed in 1:1 weight ratio and heat treated from room temperature to different target temperatures which are 410 °C, 525 °C, 1060 °C and 1310 °C respectively shown in volcanic ash-Al2O3 DTA curve. After Sample preparation, XRD analysis was conducted and the reaction products were obtained. XRD semi quantitative analysis would be used to volcanic ash-YSZ and pure YSZ patterns to compare the ratio change of tetragonal phase to monoclinic phase YSZ after different temperature of heat treatments. XRD semi quantitative analysis is a technique uses diffraction peaks to identify the fraction of selected phases inside the sample. For the mixture of two crystalline phases, the fraction of each phase can be Page 46PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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