METHOD FOR PREPARING A MAGNETIC MATERIAL BY FORGING AND MAGNETIC MATERIAL IN POWDER FORM

摘要

The invention concerns a method for preparing a magnetic material by forging, characterised in that, in a first embodiment, it comprises the following steps: placing in a sheath an alloy based on at least one rare earth, at least one transition metal and at least one other element selected among boron and carbon; bringing the whole alloy to a temperature not less than 500 DEG C; forging the whole at a deformation speed of the material not less than 8s<-1>. After forging, it is possible to subject the resulting product to at least one annealing and hydridation then dehydridation. In another embodiment, it consists in starting with an alloy based on at least one rare earth and one transition metal and proceeding as in the first embodiment. After forging and, optionally, annealing, hydridation and dehydridation treatments, the resulting material is subjected to nitriding. The invention also concerns a magnetic material in powder form, characterised in that it has a coercivity not less than 9kOe and retentivity not less than 9kG.