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CHAPTER 2 LITERATURE REVIEW and bond coat coated on nickel-based superalloy substrate. For the top coat, it is usually made from 7 to 8 wt.% yttria stabilized zirconia (YSZ) and the main purpose of the top coat is reducing the heat transfer from engine gas to the substrate material. Bond coat is covered on the substrate and provides oxygen resistance and adhesion for top coat. Between top coat and bond coat, there is a thin oxide layer called TGO. It can improve the oxidation resistance of TBC system by hindering further oxidation [3,8,9]. Figure 2.1 Cross-sectional SEM image of thermal barrier coating system 2.1.1 Single Crystal Nickel-Based Superalloy Nickel is the fifth abundant element in the world which has a melting temperature about 1455 °C, face-cantered cubic structure. Compared with other aero metals, its density (8907 kg/m3) is much higher than other aero metals such as titanium and aluminium. Within the history of aero engineering, single crystal Page 19PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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