PURPOSE: To improve magnetic characteristic, mechanical strength and corrosion resistance by manufacturing a bond-type permanent magnet through compression molding by using raw magnet powder whose entire surface is uniformly coated with thermosetting resin for bonding in advance.
CONSTITUTION: A surface of magnet powder is uniformly coated with thermosetting resin by coating rare earth/iron magnet powder consisting of rare earth/iron magnet powder of an average diameter of 300μm or below or two kinds of mixtures of average grain diameters of 63μm or less and 150 to 300μm by using a low viscosity liquid-like composition wherein thermosetting resin is dissolved in organic solvent. Thereafter, the acquired resin coated magnet powder is filled up in a die and molded by compression, and a bond-type permanent magnet is manufactured by heating and setting the molded item. Thereby, it is possible to acquire a bond-type permanent magnet whose magnetic characteristic, mechanical strength, heat resistance and corrosion resistance are good, and its manufacturing method.
OKITA MASAKAZU
KITAGAWA AKIO
SUMITOMO SPEC METALS