The paper pudlished to [Joumal of Ceramic Society of JAPAN] is opened to public in my home page.
[ABSTRACT]
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 atoperating 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.