Abstract
W-1.1 wt.%Ni lms having a -W structure were deposited on a steel substrate by using the magnetron sputtering method. Their oxidation resistance in air was inferior at temperatures above 600 C due mainly to the formation of tungsten oxides. They oxidized to an outer NiO layer that was formed by outward transport of Ni and an inner (WO3 + NiWO4)-mixed oxide layer that was formed by the inward di usion of oxygen. At the same time, substrate elements, such as Fe and Cr, di used outward toward the lm surface to be incorporated in the oxide layer.
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