Abstract
The resistance of nickel/2·5% thoria alloy to high-temperature oxidation and sulphidation has been evaluated, in comparison with that of nickel and a commercial nickel/20% chromium alloy. in sulphur-containing simulated fuel-ash and gaseous environments the resistance of the nickel/thoria approached that of nickel/chromium. The observed dependence of corrosion rate on temperature is explicable on the basis of thermodynamic consideraiions. In a simulated vanadium-containing fuel-ash the nickel/thoria alloy retained the good resistance of nickel, but in oxidation by quiescent air it showed little improvement. However, in temperature-cycled conditions the thoria dispersion conferred excellent resistance to spalling of the oxide.
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