| 简介 |
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.
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.
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