Abstract
Zr–Nb alloys with 1–10 wt.% Nb content were oxidized at 500–600 °C in the CO–CO 2 gas mixtures. The oxidation weight gain increased with Nb content and the kinetics except for Zr–1Nb alloy changed from cubic rate to linear one at 600 °C for a long period of time, 7 d. The cubic rate constant was almost insensitive to oxygen potential of oxidizing atmosphere. As the oxidation resistance deteriorated, the volume ratio of tetragonal to monoclinic zirconia phase and the relevant compressive stress in oxide film decreased with increase of Nb content. Before and after oxidation, Nb re-distribution could not be observed under the present experimental condition.
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