화학공학소재연구정보센터
Materials Science Forum, Vol.461-464, 169-173, 2004
High temperature oxidation of Fe-3Si alloy
The high temperature oxidation behavior of Fe-3Si alloy was studied in oxygen for 0.3 similar to 18 ks at 873 similar to 1273 K, by mass gain measurements, X-ray diffraction (XRD), scanning electron microscopy (SEM), optical microscopy and electron probe microanalysis (EPMA). Mass gain of the alloy increased with increasing time and temperature of oxidation. Oxide nodules were formed on the alloy after oxidation at more than 973 K. After oxidation at 1273 K, the number of oxide nodules increased with increasing oxidation time, and these nodules for 0.3, 1.8, 7.2 and 18 ks were 20, 120, 250 and 350 mum in diameter, respectively. Oxide nodules consisted of the outer scale (Fe2O3, Fe3O4) and the inner scale (Fe2SiO4, SiO2). Subscale was observed at the inner scale/substrate for 0.3 and 1.8 ks, however, the subscale disappeared after 7.2 ks oxidation at 1273 K.