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 ail at 1000 and 1100 degreesC. 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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