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CHAPTER 4 VOLCANIC ASH AND ITS PENETRATION MECHNISMS IN TBCS severely after heat treatment at 490 °C. This phenomenon demonstrated that the reaction between volcanic ash and YSZ started at 490 °C which is far below the melting point of volcanic ash. On the other hand, the volcanic ash would also influence the phase transformation of YSZ. In Figure 4.20(a), monoclinic YSZ peaks became stronger after heat treatment at 490 °C. They decreased after 950 °C thermal exposure, and slightly increased after 1160 and 1350 °C heat treatment. However, as it is shown in Figure 4.20(b), strength of monoclinic YSZ peaks keeps decreasing in pure YSZ samples with the increasing of thermal treatment temperature. Table 4.3 Ratio of tetragonal phase YSZ to monoclinic phase YSZ for volcanic ash-YSZ mixed sample and YSZ measured by using XRD Semi quantitative measurement before and after thermal exposure at different temperatures Heating temperature (°C ) Volcanic ash + YSZ YSZ As prepared 66:34 67:33 490 950 1060 1310 53:47 71:29 68:32 66:34 75:25 81:19 100:0 100:0 The ratio of tetragonal phase YSZ to monoclinic phase YSZ measured by XRD semi quantitative analysis were shown in Table 4.3. For the volcanic ash-YSZ mixed samples, the percentage of monoclinic YSZ was increased from original 34% to 47% after thermal exposure at 490 °C and decreased to 29% after heat treatment at 950 °C. After heat treatment at 1160 °C and 1350 °C, the concentration of monoclinic YSZ increased slightly to 32 and 34%. On the other hand, the concentration of monoclinic phase YSZ kept decreasing in pure YSZ samples, and it reached 0% after heat treatment at 1160 °C. According to the Page 65PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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