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CHAPTER 6 FRABRICATION OF PROTECTIVE COATINGS BY SOL-GEL BASED METHOD Table 6.5 Composition of Al2O3 protective coating measured by EDX point analysis Elements (at.%) Al O point 33.05 ± 2.18 66.95 ± 0.24 The spallation and damage of protective coatings could result in the thermal expansion mismatch of different materials, which schematic diagram was shown in Figure 6.10. During the ageing process at 600 °C, columnar gaps stretched along with the thermal expansion of the superalloy substrate. Although protective coatings would stretch during heat treatment, different level of thermal expansion still damaged the protective coatings and led to the spallation. Figure 6.10 Schematic image of the damage mechanism of protective coatings during thermal exposure Page 88PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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