Electromagnetic Characteristics and Corrosion Resistance of New Magnetosoft Materials Based on Capsulated Iron Powders
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doi: 10.1007/s40242-020-0250-8
Article
Electromagnetic Characteristics and Corrosion Resistance of New Magnetosoft Materials Based on Capsulated Iron Powders Alexander VETCHER1, Gennady GOVOR1, Olga DEMIDENKO1, Virgil CONSTANTIN2* and Ana Maria POPESCU2 1. Scientific-Practical Materials Research Centre, National Academy of Belarus, P. Brovki 19 Str., 220072 Minsk, Belarus; 2. “IlieMurgulescu” Institute of Physical Chemistry of Romanian Academy, Laboratory of Electrochemistry and Corrosion, SplaiulIndependentei 202, Bucharest 060021, Romania Abstract A new method of depositing an insulating multifunctional oxide coating on metal particles was developed. Such coatings increase corrosion resistance and insulate metal particles from each other. On base of capsulated by oxide coating water-atomized iron powder ASC100.29, new composite soft magnetic materials were synthesized, which are able of replacing electrical steel in devices. Structural, electromagnetic properties and corrosion charact eristics of the obtained composites were studied. It was found that the synthesized composite materials have low electromagnetic losses, high values of magnetic induction(up to 2.1 T) and good corrosion resistance. The results demo nstrate that the use of such materials in power supplies, chokes, transformers, stators and rotors of electric machine s and other products ensures their stable operation under various conditions. Keywords Soft magnetic composite material; Iron powder; Insulating cover; High-frequency transformer; Stators and rotors of electro machine
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Introduction
Composite materials with the necessary operational properties are widely used in components of various mechanisms and machines in such industries as electrical engineering and electronics[1—4]. Since the final properties of the products depend on the treatment methods of the starting materials, it is necessary to correctly select the conditions for obtaining composite soft magnetic materials to ensure a controlled chemical composition and structure, which in turn guarantees the required physical and functional properties. For materials operating in alternating electromagnetic fields, the most important characteristics are magnetic permeability, induction and losses due to remagnetization and eddy currents, and corrosion resistance[5—9]. The value of electrical resistivity determines the maximal frequency, with which the use of this material is advisable. Currently, a number of firms produce composite soft magnetic materials based on various encapsulated iron powders. The insulating layers prevent iron particles from contacting each other. As a result, the properties of the known composite soft magnetic materials are close to the properties of electrical steel. However, the presence of an insulating magnetically disordered substance between individual particles of metal particles leads to a decrease in the magnetic permeability(μm)
of the material to μm=100—500, and the magnitude of the magnetic induction(Bm) is of the order of Bm=1.6 T[10,11]. The task i
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