The oxidation behaviour of amorphous and crystalline Fe78Si9B13 |
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| Affiliation: | 1. Electronic Materials Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Republic of Korea;2. Department of Nano Materials Science and Engineering, Korea University of Science and Technology, Daejeon 305-350, Republic of Korea;3. Department of Materials Science and Engineering, Hoseo University, 20 Hoseo-ro, Baebang-eup, Asan-Si, Chungcheongnam-do 336-795, Republic of Korea;1. Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, UK;2. Centro Nacional de Investigaciones Metalúrgicas, CSIC, Avda. Gregorio del Amo 8, 28040 Madrid, Spain;3. School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK;1. Commissariat à l’Energie Atomique, Direction de l’Energie Nucléaire, Laboratoire d’Etude des Matériaux Actifs, Bagnols sur Cèze BP 17171, 30207, France;2. Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France |
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| Abstract: | A combination of thermogravimetry, scanning and transmission electron microscopy, electron probe microanalysis and differential scanning calorimetry has been used to investigate the oxidation kinetics, and oxide morphology, structure and composition in amorphous and crystalline Fe78Si9B13 alloys. Kinetic data indicate that the oxidation reactions of both amorphous and crystalline Fe78Si9B13 obey a parabolic rate law over the temperature range 300 to 450°C with activation energies of 120 and 86 kJ/mol respectively, indicating that grain boundary diffusion is probably the rate controlling process. The parabolic rate constant for oxidation of crystalline Fe78Si9B13 is consistently higher than for amorphous Fe78Si9B13 over the temperature range 300–450°C, so that the amorphous alloy always shows a better oxidation resistance. Electron microscopy and electron probe microanalysis show that the oxide scales formed on both amorphous and crystalline Fe78Si9B13 consist of SiO2, Fe3O4 and Fe2O3, but the detailed microstructure and compositions are different. The oxide scale formed on amorphous Fe78Si9B13 contains more SiO2 and has a small particle size, while the oxide scale formed on crystalline Fe78Si9B13 contains more Fe3O4 and consists of larger particles. The difference in oxide growth between amorphous and crystalline Fe78Si9B13 is caused by the difference in alloy microstructure. |
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