| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for producing rare earth-transition metal-nitrogen magnet powder having improved magnetic characteristics, and to provide rare earth-transition metal-nitrogen magnet powder thus obtained, and a composition for a bond magnet using the same, and a bond magnet. <P>SOLUTION: A method for producing rare earth-transition metal-nitrogen magnet powder includes: a step for mixing transition metal alloy powder, rare earth oxide powder and a reductant for reducing the rare earth oxide, and then heating and calcining the mixture in a non-oxidizing atmosphere to produce a reduction diffusion reaction product composed of a rare earth-transition metal-based mother alloy by reduction diffusion method; and a step for loading the reduction diffusion reaction product in a nitriding furnace and heating and nitriding the reduction diffusion reaction product while circulating nitriding gas. When nitriding the rare earth-transition metal alloy powder, the nitriding gas is circulated from two or more supply ports 10 provided in the nitriding furnace to perform nitriding uniformly. <P>COPYRIGHT: (C)2012,JPO&INPIT |
