| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an improved technique on a method for manufacturing a magnet powder in a simplified process, which is used for manufacture of an Nd-Fe-B-based bonded magnet, and produces a magnet with high performance due to own anisotropy. <P>SOLUTION: This method for manufacturing the magnet powder comprises preheating a metal tube filled with a rapidly quenched powder so as to hold it in an atmosphere having a lower temperature than the crystallization temperature of a magnet alloy, to make the temperature of the rapidly quenched powder reach approximately the atmospheric temperature, then heating it to 650-900°C and uniaxially compressing it. Thereby the method provides the magnet powder while preventing the particles from coarsening. Alternatively, the method for manufacturing the magnet powder is characterized by uniaxially compressing the powder at such a working speed as to adjust the strain rate defined by ln(L<SB>0</SB>/L)/T (wherein, L<SB>0</SB>indicates a height of the metal tube before compression; L indicates a height of the metal tube after compression; and T indicates a compression time (second)), into a range of 0.5-3.0 per second, to increase a degree of the anisotropy. Both of the methods are preferably jointly performed. <P>COPYRIGHT: (C)2004,JPO |
