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[en] Sol-gel spin-coating of SiO2 was applied on a TiAl-based alloy, and subsequent heat treatment was performed at 1000 deg. C by embedding in active carbon. It was revealed by XRD and SEM/EDS analysis that a composite coating constituted of sublayers of SiO2, Al2O3 and TixSiy in succession from the outer to inner formed on TiAl-based alloy after the treatment. Cyclic oxidation test showed that the sol-gel coating combined with the subsequent heat treatment is effective in improving the oxidation resistance of TiAl alloys
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