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CHAPTER 5 CHARACTERIZATION OF PROTECTIVE COATING MATERIALS cross-sectional SEM images and EDX mappings of YSZ plates heat treated with volcanic ash on the top of the surface at 1250 °C for 5 hours and 20 hours are shown in Figure 5.1. The results showed that YSZ plates provide a poor ability against volcanic ash penetration. After the 5 hours and 20 hours heating, volcanic ash penetrated to about 118.35 μm and 296.44 μm. Following the same experimental procedure with YSZ plates, heat treatments were carried out in alumina plates. Figure 5.1 Volcanic ash attack on YSZ plates after thermal exposure at 1250 °C for (a) 5 hours and (b) 20 hours Compared with YSZ plates, alumina plates showed very different ability against volcanic ash. After 20 hours of heat treatment, volcanic ash was still not able to penetrate the alumina plates which SEM images and EDX mappings are shown in Figure 5.2. During the heat treatment, two layers were formed between the volcanic ash and Al2O3 plate. The first layer contained the mixed oxides of Mg, Al, and Fe, with a thickness of 1.31 and 1.75 μm were observed to lie on the alumina plate after 5 hours and 20 hours of thermal exposure respectively. On Page 70PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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