Positive Temperature Coefficient of Magnetization Characteristic for Composite Plastic-Bonded Magnet Composed of Nd2Fe14B and SrO 6Fe2O3

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  • Nd<SUB>2</SUB>Fe<SUB>14</SUB>BとSrO·6Fe<SUB>2</SUB>O<SUB>3</SUB>からなる複合プラスチックボンド磁石における 磁化特性の正の温度係数

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Plastic-bonded magnets were prepared by magnetic field injection molding, using a mixture of Nd2Fe14B and SrO·6Fe2O3 pellets. The magnetic characteristics and temperature coefficients of these magnets were investigated. The hysteresis loop for the temperature change of the plastic-bonded magnet was measured. An important phenomenon was revealed pertaining to the physical properties of the magnetic material: under ordinary temperature conditions, the magnetic temperature coefficient of magnetic flux density and coercive force for the Nd2Fe14B and SrO·6Fe2O3 plastic-bonded magnet for the case of adequate SrO·6Fe2O3 content attained a positive value at a SrO·6Fe2O3 content ranging from about 20 to 60 mass% at 297–323 K, and from around 18 to 43 mass% at 323–373 K. Moreover, it was proven that the temperature coefficients of the magnetic flux density at operating points of permeance coefficients Pc(B⁄H)=1 and 2 could be controlled from 0 to 0.22%/K at 297–323 K and from 0 to 0.1%/K at 323–373 K, respectively.

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