A process for producing a rare earth-iron-boron magnet.

摘要

This invention provides a process for producing a rare earth-iron-boron magnet, which includes the steps of: charging a melt spinning powder of a rare earth-iron-boron material into at least one cavity, wherein the cavity is formed between a pair of electrodes which are inserted into a hole provided in an electrically non-conductive ceramic die; subjecting the melt spinning powder to a non-equilibrium plasma treatment, while applying a uniaxial pressure of 200 to 500 kgf/cm<2> to the melt spinning powder in the direction connecting the electrodes interposed between a pair of heat-compensating members under a reduced atmosphere of 10<-><1> to 10<-><3> Torr, thereby causing the fixation of the melt spinning powder; and heating the fixed melt spinning powder to a temperature higher than or equal to the crystallization temperature thereof by transferring Joule heat generated in the thermal compensating members when a current is allowed to pass through the members to the melt spinning powder, thereby causing the plastic deformation of the melt spinning powder to form a rare earth-iron-boron magnet.