Electrochemical Polishing of Thin Metallic Glass Ribbons
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Soft magnetic inductive components with low power losses are forming the vital part of modern power electronic and electrotechnical equipment such like wind turbines, solar inverters, industrial drives, and vehicles. Ribbons of thin metallic glass produced by planar flow casting and annealed into nanocrystalline structure are successful in achieving superb properties like ultralow coercitive force (Hc ~ 1 A/m), wide range of adjustable relative permeability (µr ~ 1000–200,000), and wide operational temperature range (Top ~ 77–473 K). In this report, we present investigations on electrochemically polished ribbons. Reduction of surface roughness from 1–2 µm to 200–400 nm was revealed by atomic force microscopy. Small core samples made of the ribbons were annealed in transversal magnetic field. Frequency dependence of complex permeability and power losses of these samples confirm that electrochemical polishing did not cause deterioration of the soft magnetic properties.
KeywordsFe-based nanocrystalline alloys Electrolytic surface treatment Soft magnetic cores Power electronics Energy efficiency
We are grateful for Magnetec-Ungarn Kft for the financial support of the experiments, for Bay Zoltán Nonprofit Kft for Applied Research for providing access to the microscopes, and for Miskolc University Institute of Physical Metallurgy, Metalforming and Nanotechnology for providing access to the AFM. We thank to Anita Heczel and Zoltán Palánki for the useful discussions.
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