Method for compacting magnetic powder in magnetic field, and method for producing rare-earth sintered magnet

摘要

A method for compacting a magnetic powder in a magnetic field comprising steps of filling a die with a magnetic powder, applying a pulsed magnetic field to the magnetic powder in the die to orientate the powder, and compressing the magnetic powder, wherein the pulsed magnetic field is applied twice or more when density ρ of a compacted body of said magnetic powder satisfies the relationship ρ = α × H0.5 + β (α = 0.63 and β = 1 to 2), where H is intensity (T) of the applied magnetic field.