Abstract
The main reason for the study of FeSi-based (FINEMET) and FeZr-based (NANOPERM) alloys was their magnetic properties. However, one of the limiting factors in commercial uses of these alloys is the oxidation, which occurs at high service temperature such as 800 °C. Due to this high service temperature, a non-magnetic oxide layer is formed on the surface and the soft magnetic properties remarkably diminish. In this work, it was carried out mass gain measurements in order to identify the oxidation resistance of four different FeCo-based nanocrystalline alloys: Fe 38.5Co 38.5Nb 7Cu 1B 15, Fe 36Co 36Nb 7Si 10B 11, Fe 36Co 36Nb 6Cu 1Si 10B 11, and Fe 33.5Co 33.5Nb 7Si 15B 11. XPS analysis was used in order to identify and quantify the oxides formed during the exposure to an oxidant environment at high temperature. SEM also observed these oxide layers. The main conclusion is that the addition of Si improved the oxidation resistance of the nanocrystalline alloys. This is attributed to the increase of SiO 2 amount and decrease of Fe 2O 3 content on the surface layer, enhancing the surface oxide characteristics.
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