Abstract
Formation and oxidation of the protective coating layer have been investigated on a TiAl alloy by an aluminide pack cementation, followed by an Y pack cementation in order to form the preferential Al2O3 scale containing Y. The protective coating layer of Al-Y compounds and particles to which Ti was discharged forms by the selective reaction of Y with Al on the surface of TiAl3. The formation of a TiAl2 layer is accelerated in the coating layer by oxidation, after spallation of the Al2O3 scale in the aluminide coating. Little change is observed in the composition of the coating layer, TiAl3 to TiAl2 in comparison with the aluminide coating since spallation of the scale was suppressed in oxidation of the Al-Y coating layer at 1173 to 1273K, suggesting that Y coating promotes the formation of an adherent Al2O3 scale on the outer coating.
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