Abstract
Co/Si co-doped β-NiAl coating on nickel based superalloys was prepared using pack cementation method. Microstructure and cyclic oxidation behaviour of the coating were investigated. The weight loss of the coating is less than 3 mg/cm2 after 3200 cycles at 1050 °C. The coating exhibits a good cyclic oxidation resistance. The addition of Si decreases the growth stress in the oxide scale by inhibiting the formation of harmful NiO. The formation of SiO2 particles at the scale/coating interface decreases the growth rate of the Al2O3 scale. Moreover, Si addition promotes the formation of the high Al-content phase β-NiAl.
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