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CHAPTER 4 VOLCANIC ASH AND ITS PENETRATION MECHNISMS IN TBCS Figure 4.17 EDX point analysis of YSZ top coat after 10 hours heat treatment with volcanic ash at 1250 °C Table 4.2 Data of EDX point analysis Element ( at.%) Pt.1 Pt.2 Pt.3 Pt.4 Pt.5 Pt.6 Zr Y 17.67 - 33.75 1.45 33.78 1.37 34.29 1.64 33.74 1.39 32.74 1.12 O Al Si 66.72 0.39 15.22 64.80 - - 64.85 - - 64.07 - - 64.87 - - 66.14 - - The concentration change of Y2O3 in YSZ top coat after different hours of heat treatment at 1250 °C measured by EDX point analysis is presented in Figure 4.18. The results show that the concentration of Y2O3 decreases with increasing heat treatment time. For the original TBC top coat, 8 wt.% of Y2O3 was added into ZrO2 as the phase stabilizer. However, the concentration decreased to 7.77 wt.% after 1 hour thermal exposure. After 3 hours of heat treatment, the concentration of Y2O3 reduced to 6.47 wt.% and only 3.71 wt.% of Y2O3 left in YSZ top coat columns after 10 hours thermal exposure. All these results suggest that two Page 61PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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