Patent ID: 8545641

Claim:
A method for manufacturing a sintered NdFeB magnet having a magnetic anisotropy, comprising: a) loading an NdFeB alloy powder into a container (called a mold hereinafter) having a cavity whose form corresponds to that of a product to be obtained with a loading density of the alloy powder being within a range from 47.4 to 55% of a real density, the alloy powder having an average grain size D 50 of 0.5 to 5 μm measured with a laser grain-size distribution measurement apparatus and containing a total of 6 weight percent or smaller of Dy and/or Tb; b) applying an orienting magnetic field that is 2 T or higher to the alloy powder in absence of a compression to orient the alloy powder; c) creating a sintered body by heating the alloy powder contained in the mold in an absence of a compression while allowing gas components released from the alloy powder to escape from the mold; and d) taking out the sintered body of the alloy powder from the mold, wherein the steps a) through c) are performed under vacuum or under an atmosphere of an inert gas.