| 摘要 |
PURPOSE:To provide a resin bonded magnet having improved heat resistance, chemical resistance and magnetic properties by coating magnetic powder with a specific weight of a thermoplastic resin having crystallinity and heat resistance. CONSTITUTION:Magnetic powder is coated with 0.1 to 5% by weight thermoplastic resin having crystallinity and heat resistance. Such magnetic powder is cold-compression molded to produce a resin bonded magnet. A desirable thermoplastic resin is the one having a melting point of 200 deg.C or over and having at least one -S- or -O- bond in its chemical bond skeleton, such as polyether ether ketone or polysulphide ketone. While the magnet powder as it is may be mixed with the thermoplastic resin, it is preferably surface treated with a coupling agent of 5% by weight relative to the magnet powder before mixing in order to prevent the oxidation of the magnetic powder and to improve the adhesive property to the binder (thermoplastic resin). |
