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CHAPTER 4 VOLCANIC ASH AND ITS PENETRATION MECHNISMS IN TBCS and YSZ were measured by DTA, and their reaction products were observed using XRD after reaction temperatures were determined. The DTA curves of volcanic ash, YSZ, and volcanic ash-YSZ mixture sample were shown in Figure 4.19. In the DTA curve of volcanic ash-YSZ mixture sample, there are four peaks or valleys located at 490 °C, 950 °C, 1160 °C, and 1350 °C. By comparing with these three patterns, the melting point of volcanic ash and the phase transformation point of YSZ might be shifted. For the melting point of volcanic ash, it was reported to be at 1235 °C in chapter 4.1. However, the endothermic valley which is able to represent the melting of volcanic ash was shifted to about 1160 °C in volcanic ash-YSZ mixture DTA curve. Figure 4.19 DTA curves of volcanic ash, Al2O3, and volcanic ash-Al2O3 mixture For the phase transformation of YSZ, it has been reported in Figure 2.3 [12] that phase transformation from monoclinic to tetragonal would happen when the temperature reaches around 1050 °C. Also, the DTA curve of YSZ showed an exothermic peak at 1050 °C which corresponds to the phase transformation from monoclinic YSZ to tetragonal phase YSZ. This result is in accordance with the Page 63PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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