| 摘要 |
The present invention provides a method for manufacturing rare-earth magnets which can manufacture a rare-earth magnet having an excellent magnetic property from magnetic powder prepared by a liquid rapid-quenching and even including a nanocrystalline substance and an amorphous substance as well. The method comprises: a first step of rapidly quenching a metal forging represented by a composition formula of (Rl)x(Rh)yTzBsMt (herein, R1 denotes one or more types of light rare-earth elements containing Y, Rh denotes a heavy rare-earth element containing at least one type of Dy and Tb, T denotes transition metals containing at least one type of Fe, Ni and Co, B denotes boron, M denotes at least one type of Ga, Al and Cu, and 27<=x<=44, 0<=y<=10, z=100-x-y-s-t, 0.75<=s<=3.4, 0<=t<=3, all of them are percentages by mass), and prepares magnetic powder (MF) including a mixture of magnetic powder of the nanocrystalline substance having an average crystal grain size of 500nm or less and magnetic powder of the amorphous substance; and a second step of preparing a sintered body (S) by sintering the magnetic powder (MF) and performing hot deformation processing of the sintered body (S), thereby manufacturing a rare-earth magnet (C). |
