I would like to perform high temperature oxidation experiments in air. If I understand correctly, the amount of water vapor in the air has a great influence on the oxide scale growth.
Can anyone give me tips on how to determine or at least approximate the proportion of water in the air at up to 1200 °C?
Hi, presumably it is easier to determine level of water in air going into your furnace when the feed is at RT rather than the other way round? assumption is that water going in = water present?
Dear all, if I understood well the question, there are two main reasons behind any possible change (loss) of the amount of water, i.e., either by decomposition or if it is consumed by the reaction forming the oxide. For the first case, water is stable up to 2000°C (see document below). For the second situation, details are needed about the reactant and the nature of the reaction. My Regards
https://doi.org/10.1016/B978-0-08-022713-9.50010-0
Ah, makes more sense now - i think you cannot exclude h2o breaking down and assisting the oxidation process - potentially there might b a catalytic effect of the fe or feO surface on such a decomposition anyhow. best way is to seal your furnace and feed in “wet” air and “dry” air as two separate experiments and monitor weight change and/or h2o conc in air going in and in air coming out. you might even get morphological differences in the oxidation - so some post SEM work might be interesting to do.
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