| 摘要 |
A method for manufacturing an anisotropic magnet powder includes a high-temperature hydrogenation process of holding an RFeB-based alloy containing rare earth elements (R), B and Fe as main ingredients in a treating atmosphere under a first treating pressure (P 1 ) of which a hydrogen partial pressure ranges from 10 to 100 kPa and at a first treating temperature (T 1 ) which ranges from 953 to 1133 K, a structure stabilization process of holding the RFeB-based alloy after the high-temperature hydrogenation process under a second treating pressure (P 2 ) of which a hydrogen partial pressure is 10 or more and at a second treating temperature (T 2 ) which ranges from 1033 to 1213 K such that the condition T 2 >T 1 or P 2 >P 1 is satisfied, a controlled evacuation process of holding the RFeB-based alloy after the structure stabilization process in a treating atmosphere under a third treating pressure (P 3 ) of which a hydrogen partial pressure ranges from 0.1 to 10 kPa and at a third treating temperature (T 3 ) which ranges from 1033 to 1213 K, and a forced evacuation process of removing residual hydrogen (H) from the RFeB-based alloy after the controlled evacuation process. With this method, the magnetic properties of the anisotropic magnet powder can be improved.
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