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CHAPTER 5 CHARACTERIZATION OF PROTECTIVE COATING MATERIALS The XRD spectra of volcanic ash-Al2O3 were shown in Figure 5.4. Actually, weaker peaks coming from volcanic ash were covered by Al2O3 signals in their mixed DTA patterns, but the formation of anorthite and other reaction products can still be discovered. After 1310 °C of heat treatment, signals coming from volcanic ash were getting weaker in the XRD pattern after 1310 °C heat treatment, which it is believed to be caused by two reasons: The first reason is because of the formation of a new reaction product. Under high temperature, strong reactions between volcanic ash and Al2O3 led the formation of new reaction products and decreased the signals of volcanic ash. The second reason is that the volcanic ash started to melt partially, which can be explained by the endothermic region starting from 1310 °C in the DTA curve shown in Figure 5.3. By analysing the XRD spectra, anorthite (Al2CaSi2O8), magnetite (Fe3O4), and spinel (Al1.75Mg0.889Mn0.351O4) were found as reaction products after 1310 °C of thermal exposure. These results correspond to the EDX results shown in Figure 5.2. The layer upon alumina plate shown in Figure 5.2 is made from magnetite and spinel and the layer below volcanic ash is made from anorthite. After thermal exposure at 410 °C, the composition of anorthite sodian transferred to labradorite (Al0.81Ca0.325Na0.16Si1.19O4) by reducing the ratio of Na, Si and adding the ratio of Al, and Ca in its composition. Indeed, major peaks of anorthtite sodian and labradorite are almost located in the same position, but it is still able to be differentiate by comparing their peak strength. For instance, there are three peaks located between 22 and 25 degree, if the strength of the right peak is almost the Page 73PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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