Abstract
Thermal Barrier Coating (TBC) as protective coatings are applied to maintain efficiency and prevent structural failures mainly in gas turbine system. This paper reviews on recent bond coating from Nickel aluminide bond coat with addition of Reactive Elements (RE). This paper also reviews the major concern in TBC with presence of different Reactive Element (RE) added in term of RE composition, properties and oxidation test performance. Recent studies are more focusing on few REs including Ce, Hf, La, Y and Zr based on oxidation property test results. The comparisons clearly show that ceramics addition are superior for bond coat mechanical and thermal properties improvement while RE addition such as Ce and Zr present excellent oxidation performance at 900°C and above.
Highlights
Thermal Barrier Coating (TBC) is widely applied to protect hot sections of mechanical component for aerospace engines, aircraft engines and power generation industry
The aim of this paper is to review intermetallic Nickel aluminides as bond coat normally used in gas turbines
It is believed that TBC system with good bond coat material should has thinner Thermally-Grown Oxide (TGO) layer formed and has better oxidation behavior compared to TBC system that has thicker TGO layer [37]
Summary
Thermal Barrier Coating (TBC) is widely applied to protect hot sections of mechanical component for aerospace engines, aircraft engines and power generation industry. A protective oxide layer known as Thermally-Grown Oxide (TGO) layer grows to improve the adhesion between top coat and NiAl bond coat [2] This TBC provides engine efficiency by increasing inlet temperature for gas combustion and lowering operation temperature of super alloy substrate. Alumina layer formed on the surface of materials plays vital role to provide excellent oxidation resistance at temperature as high as at 1000°C or even higher in nickel aluminides [8]. It is believed alumina is much more thermodynamically stable at high temperatures than Cr2O3 [8]. The effects of Reactive Element addition is reviewed in term of mechanical properties and oxidation behaviour at elevated extreme temperature range of 900-1400°C
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