Abstract
The isothermal and cyclic-oxidation behavior of three different batches of commercial chromium (purity >99.9%) at 900 and 1000°C has been investigated by means of conventional thermogravimetry and thin-layer activation. Two batches with a similar microstructure and one, with a five times larger average grain size, were used. Isothermal-oxidation experiments were performed in synthetic air for 150 hr. Cyclic-oxidation experiments were executed in static laboratory air with each cycle corresponding to a period of 1 hr at test temperature and 12 min at ambient temperature up to a maximum of 3000 cycles. Results showed significant differences between the oxidation behavior of chromium derived from the three different batches. This was found under isothermal as well as under cyclic-oxidation conditions, especially at 1000°C. The mass-loss rates during cyclic oxidation for the different batches differed up to more than 30 times at 1000°C. In addition, the complementary nature of the different specimen-evaluation techniques, i.e., conventional thermogravimetry and thin-layer activation in cyclic oxidation is shown.
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