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CHAPTER 5 CHARACTERIZATION OF PROTECTIVE COATING MATERIALS other hand, the second layer is located between volcanic ash glass and the first layer, which contains the mixed oxides of Ca, Si, and Al. The thicknesses of the second layer after 5 and 20 hours of heat treatment were 1.22 μm and 1.70 μm respectively. These two reaction layers are going to be explained in subsequent sections. Figure 5.2 Volcanic ash attack on Al2O3 plates after thermal exposure at 1250 °C for (a) 5 hours and (b) 20 hours 5.2 Investigation of the reaction between volcanic ash and alumina by DTA and XRD The reaction temperatures between volcanic ash and Al2O3 were measured by using DTA analysis, and the corresponding reaction products were analysed using XRD. The DTA curve of volcanic ash, alumina and volcanic ash-Al2O3 mixed samples are shown in Figure 5.3. In the DTA curve of volcanic ash-Al2O3 mixed sample, four peaks and valleys were found, which were respectively located at 410 °C, 525 °C, 1060 °C, and 1310 °C. There is no sharp endothermic valley which is able to represent the melting point of volcanic ash-Al2O3 mixed sample on their DTA curve even until 1480 °C. It can be confirmed that compared Page 71PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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