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Oxidation Behaviour of Fe–Si Alloys with Different Si Contents

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The oxidation behaviour of conventional casting (CA) Fe–Si alloys was studied at 900–1000 °C in pure O2. All the alloys formed similar complex scales like Fe2O3 → Fe3O4 + FeO → FeO → FeO + SiO2, and did not form continuous and protective layers of SiO2. The oxidation rate of every alloy increases as temperature increases. And as the content of Si in the alloys increases, the oxidation rates of all alloys are reduced. The reason is that there are composite oxide zones (FeO + SiO2 rich in SiO2 in all the oxide scales of all alloys, which act as barriers for the diffusion of Fe and oxygen. And as the content of Si in alloys increases, the volume fraction of SiO2 in FeO+SiO2 increases, which makes this effect more evident.
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Keywords: CASTING ALLOYS; FE–SI ALLOY; HIGH-TEMPERATURE OXIDATION

Document Type: Research Article

Publication date: February 1, 2011

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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