Abstract
Nano-CeO2 reinforced NiCoCrAlY nanocomposite coatings were applied by high velocity oxygen fuel spraying (HVOF) method. To prepare nano-CeO2 reinforced NiCoCrAlY nanocomposite powder feedstock, the high-energy planetary ball-milling process was used. The mixture ratios for nanocomposite coatings were selected 0.5, 1 and 2 wt% of nano-CeO2. For the measurement of oxidation kinetics, free-standing coating specimens were exposed to air at 1273 K and the thickness of the thermally grown oxide (TGO) scale was measured and analyzed at several exposure times. The microstructure of the coatings before and after oxidation test as well as prepared feedstock powders was evaluated by field emission scanning electron microscope (FESEM). In addition, the microhardness of different composition of nano-CeO2 reinforced NiCoCrAlY nanocomposite coatings were obtained and compared with the conventional NiCoCrAlY coating. The results indicated that the nanocomposite coating of NiCoCrAlY-1 wt% nano-CeO2 had better oxidation behavior. The mentioned coating also had higher hardness and lower porosity content in comparison with all other types of conventional and nanocomposite NiCoCrAlY coatings.
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