| 简介 |
PROBLEM TO BE SOLVED : To provide a process for producing the material of a rare earth permanent magnet as an R-Fe-B based anisotropic sintered magnet where magnetic characteristics impaired by grinding are recovered.
SOLUTION : An anisotropic sintered magnet body represented by composition formula Rx(Fe1-yCoy)100-x-z-aBzMa (R is a rare earth elements containing Sc and Y, M is Al, Cu, Zn, In, Si, P, S, Ti, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Hf, Ta or W) is ground to have a specific surface area of 6 mm-1 or above. Subsequently, disproportionation reaction is caused in an R2Fe14B type compound by heat treatment at 600-1, 100°C in an atmosphere containing hydrogen gas, and recombination reaction on the R2Fe14B type compound is caused by heat treatment at 600-1, 100°C in an atmosphere where partial pressure of hydrogen gas is lowered, thus making the crystal grain of R2Fe14B type compound as fine as 1 μm or less.
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