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CHAPTER 4 VOLCANIC ASH AND ITS PENETRATION MECHNISMS IN TBCS in Figure 4.17 and Table 4.2, point 1 shows the composition of volcanic ash glass. It can be seen that besides the original elements existed in the volcanic ash, 17.67 at.% of zirconium was detected although zirconium signals might come from the surrounding YSZ columns. Compositions of point 2 to 6 are also included, which indicates that the concentration of yttrium got reduced considerably. Compared with the original 8YSZ (8 wt.% of Y2O3 induced, approximately equal to 2.9 at.% of Y in its composition), only 1.1 - 1.6 at.% of yttrium remained which means that the concentration of yttrium had been decreased by almost 1.6 at.%. Although further phase detecting experiments haven’t been done on TBC samples, according to the literature review [36,38], molten CMAS is able to deplete the yttria from YSZ which cause stabilized zirconia turned to Y-lean zirconia. Also, its phase will be transformed from tetragonal prime phase to monoclinic phase along with the composition change. And this phenomenon not only exist in CMAS attack but also volcanic ash degradation [41,69]. Figure 4.16 SEM image of YSZ top coat after 10 hours heat treatment with volcanic ash at 1250 °C Page 60PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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