Process for producing anisotropic magnet powder

A method for manufacturing an anisotropic magnet powder characterized in that the method comprises:

• a high-temperature hydrogenation process of holding an RFeB-based alloy containing a rare earth element (hereinafter referred to as “R”), boron (B) and iron (Fe) as main ingredients in a treating atmosphere under a first treating pressure (hereinafter referred to as “P1”) of which a hydrogen partial pressure ranges from 10 to 100 kPa and at a first treating temperature (hereinafter referred to as “T1”) which ranges from 953 to 1133 K;
• a structure stabilization process of holding said RFeB-based alloy after said high-temperature hydrogenation process in a treating atmosphere under a second treating pressure (hereinafter referred to as “P2”) of which a hydrogen partial pressure is 10 kPa or more and at a second treating temperature (hereinafter referred to as “T2”) which ranges from 1033 to 1213 K such that one of condition T2>T1 and P2>P1 is satisfied;
• a controlled evacuation process of holding said RFeB-based alloy after said structure stabilization process in a treating atmosphere under a third treating pressure (hereinafter referred to as “P3”) of which a hydrogen partial pressure ranges from 0.1 to 10 kPa and at a third treating temperature (hereinafter referred to as “T3”) which ranges from 1033 to 1213 K, and
• a forced evacuation process of removing residual hydrogen (H) from said RFeB-based alloy after said controlled evacuation process.