Abstract
The effect of Y2O3 on the oxidation resistance of Nb-Ti-Si based alloys was investigated. Acicular Y2O3 is generated with Y content exceeding 0.3 at%. Oxidation tests reveal that the mass gain per unit area of the Y-containing alloys is lower than that of the Y-free alloy at 800 °C and 1200 °C. The oxide layer of the Y-free alloy will fracture and even pesting. After adding Y, the Y2O3 can react with Nb2O5 and TiO2 to generate YNbTiO6. The pinned YNbTiO6 at the interface enhances the adhesion between the oxide layer and substrate, slowing down the growth of the oxide layer.
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