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CHAPTER 4 VOLCANIC ASH AND ITS PENETRATION MECHNISMS IN TBCS 1200 °C heat treatment. Also, its height difference reduced from 291.6 μm to 113.8 μm. After heat treatment at 1250 °C, the surface structure of volcanic ash became much smoother and by observing its surface roughness, there is only 36.4 μm height difference. In Figure 4.7, the sample has been heated at 1300 °C and the surface structure and roughness looked almost the same with the sample which heated at 1250 °C. All of these observations demonstrate that the volcanic ash melts between 1200 to 1250 °C which agrees well with the result of the DTA test (melting point 1235 °C). Figure 4.3 DTA curve for volcanic ash AB Figure 4.4 (A) Surface image of volcanic ash and (B) its surface roughness Page 52PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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