Patent ID: 7138018

Claim:
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 “P 1 ”) of which a hydrogen partial pressure ranges from 10 to 100 kPa and at a first treating temperature (hereinafter referred to as “T 1 ”) 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 “P 2 ”) of which a hydrogen partial pressure is 10 kPa or more and at a second treating temperature (hereinafter referred to as “T 2 ”) which ranges from 1033 to 1213 K such that one of condition T 2 >T 1 and P 2 >P 1 is satisfied; a controlled evacuation process of holding said RFeB-based alloy after said structure stabilization process in a treating atmosphere and carrying out dehydrogenation under a third treating pressure (hereinafter referred to as “P 3 ”) of which a hydrogen partial pressure ranges from 0.1 to 10 kPa and at a third treating temperature (hereinafter referred to as “T 3 ”) which ranges from 1033 to 1213 K such that the condition P 3 <P 2 is satisfied, and a forced evacuation process of removing residual hydrogen (H) from said RFeB-based alloy after said controlled evacuation process.