Abstract
Alloys based on Co-25% Cr containing approximately 2.5, 5.0, 7.5 and 10 mass %Ti were oxidised in oxygen and air in the temperature range 1173–1373 K for times of up to 1.26 Ms. In general, the addition of titanium proved to be beneficial at all temperatures, promoting the development of protective oxide scales. The role of titanium appeared to be dependent upon the ability of the titanium-containing alloys to form a compound oxide; spinel CrTi2O4 and internal titanium oxides which accelerate the development of the Cr2O3 oxide. The titanium-rich oxides formed a layer adjacent to the metal; while a Cr-rich layer was found above it. It is possible that titanium reduced the oxygen activity at the surface of the alloy, preventing the formation of cobalt-containing oxides, which might otherwise disrupt the protective scale.
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