Influence of yttria additions on the oxidation behaviour of titanium prepared by powder metallurgy

The yttria dispersion effect on the oxidation resistance of titanium prepared by powder metallurgy has been evaluated between 700 and 900 °C. Yttria additions slightly increase the oxidation rate up to 800 °C and decrease it considerably at 900 °C. The multilayered rutile scale formed on pure titanium prepared by conventional techniques is replaced by a denser rutile scale in the case of titanium prepared by powder metallurgy. Yttria additions raise the temperature at which a more protective dense rutile scale is formed.