| 简介 |
The present invention relates to a method for producing a rare earth magnet by means of hot plastic working and to a rare earth magnet produced using this method, and the purpose of the present invention is to provide a rare earth magnet, and a method for producing the same, in which excellent workability during hot plastic working is achieved by controlling the content of Pr, which is an alloy component, so as to be within an optimal range and for which coercive force and magnetization performance are excellent in high temperature environments. The production method comprises the following : a first step, in which a molded body (S) is produced by pressure-molding a magnetic powder (B) which is a rare earth magnet material and consists of a RE-Fe-B-based main phase (MP) (RE : Nd and Pr) and an RE-X alloy (X : a metallic element) grain boundary phase (BP) in the periphery of the main phase (MP), and in which the average particle diameter of the main phase (MP) is within the range of 10-200 nm; and a second step in which a rare earth magnet (C) that is a nanocrystalline magnet is produced by carrying out hot plastic working that imparts the molded body (S) with anisotropic properties. The contents of Nd, B, Co and Pr in the magnetic powder (B) are 25-35% of Nd, 0.5-1.5% of B, 2-7% of Co and 0.2-5% of Pr in terms of at%, and the magnetic powder contains Fe. |
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