METHOD FOR MANUFACTURING NEODYMIUM-IRON-BORON MAGNET HAVING LARGE COERCIVE FORCE

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a NdFeB magnet having a large residual magnetization and a large coercive force.

SOLUTION: The method for manufacturing a NdFeB magnet comprises the steps of: causing a non-magnetic phase to touch a magnetic structure including Nd2Fe14B phase; heating the non-magnetic phase to a temperature equal to or higher than its melting point; and distributing the non-magnetic phase to lie at grain boundaries in the magnetic structure. In the method, at least a part of the magnetic structure including the Nd2Fe14B phase is composed of nanocrystal grains having a grain size of 10-300 nm.

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