Patent ID: 8333848
Filing Date: 2012-12-18
Classification: B22F,C22C,H01F

Abstract:
1. A permanent magnet manufactured by steps of: wet-pulverizing a high-melting metal element-containing organic compound or a precursor of a high-melting ceramic in a solvent together with a magnet raw material to pulverize the magnet raw material into fine particles having a grain size of 3 μm or less and to coat a surface of the pulverized magnet raw material with the high-melting metal element-containing organic compound or the precursor of the high-melting ceramic; adding a resin binder to the magnet raw material coated with the high-melting metal element-containing organic compound or the precursor of the high-melting ceramic; producing a slurry by kneading the magnet raw material and the resin binder; molding the slurry into a sheet form to prepare a green sheet; and sintering the green sheet, wherein the permanent magnet is Nd—Fe—B-based and contains 27 to 30 weight % Nd, 60 to 70 weight % Fe, and 1 to 2 weight % B, and wherein the high-melting metal element containing organic compound is an organic compound containing Ta, Mo, W or Nb, and the precursor of a high-melting ceramic is a precursor of BN or AIN.