Abstract
The oxidation behavior and electrical property of a Ni–Mo–Cr alloy at in a simulated solid oxide fuel cell (SOFC) anode environment (humidified and diluted ) have been studied. The thermally grown oxide scale presents a multilayered structure, which is similar to that formed in air, with densely grown in between an underneath layer of the intermetallic compound and a less compact top layer consisting of with flakes embedded. The oxidation kinetics obey a two-stage parabolic law with an initially fast oxidation (0–170 h at a rate of ) followed by a slower steady oxidation (170–1000 h at a rate of ). The reducing atmosphere, even with a significantly lower oxygen partial pressure, has a negative effect on the high temperature oxidation resistance; however, it enhances the adherence of the scale to the substrate. The outward diffusion of Ti ions changes the composition, lattice parameters, and diffraction peak positions of the formed oxides, leading to Ti-doped and the spinel. The area specific resistance of the oxide scale preformed at for 1000 h is at , which is higher than that formed in air and lower than that of other studied Ni-based alloys.
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