How do the properties of metal oxide films change at high temperatures?

2026-07-20View Original

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Considering the background of previous water-cooled reactor systems, there are significant differences in the performance changes of metal oxide protective films made from different materials at high temperatures: First, in an environment of 600°C, the thickness of the oxide film formed on the FeCrAl alloy remains stable at 2.8–3.2 μm, resulting in excellent oxidation resistance. Under a saturated oxygen environment at 550°C for an extended period, a continuous and stable Al₂O₃ layer is formed after 4000 hours, with no further increase in thickness. Above 800°C, the oxidation rate increases sharply, and excess Cr will precipitate the σ phase, compromising the integrity of the film layer.

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How do the properties of metal oxide films change at high temperatures?

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