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CHAPTER 4 VOLCANIC ASH AND ITS PENETRATION MECHNISMS IN TBCS YSZ phase diagram shown in Figure 2.3. However, the phase transformation point seemed to have decreased from 1050 °C to 950 °C by mixing volcanic ash. Further details would be explained using XRD analysis. Figure 4.20 XRD spectra of (a) volcanic ash-YSZ mixture samples and (b) pure YSZ samples before and after heat treatment at 490 °C, 950 °C, 1160 °C, and 1350 °C The XRD patterns of volcanic ash-YSZ mixture are shown in Figure 4.20(a). Signals coming from YSZ were too strong, which made most peaks of volcanic ash invisible. Thus, XRD pattern of pure YSZ is shown in Figure 4.20(b) as a comparison. Comparing with the XRD patterns of volcanic ash-YSZ mixture samples and pure YSZ samples, two changes are identified: decreasing of SiO2 signal and the phase transformation of YSZ. In Figure 4.20(a), SiO2 peak was observed in as prepared volcanic ash-YSZ mixture sample, but it decreased Page 64PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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