Abstract
The effect of a microcrystalline NiAl coating prepared by magnetron sputtering on the high-temperature oxidation resistance of a NiAl–TiC (20 vol.%) composite was investigated in air at 1000 and 1100°C. It was found that the isothermal as well as the cyclic oxidation resistance of the NiAl–TiC composite were greatly improved by the microcrystalline NiAl coating. The oxide scale formed on the NiAl–TiC composite was composed mainly of TiO2. On the contrary, the scales formed on NiAl–TiC coated with microcrystalline NiAl were only Al2O3.
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