Research Progress of Sintered Nb-Fe-B Permanent Magnets

As the third generation of rare earth permanent magnet material,the sintered Nd-Fe-B magnets possess the best integrated magnetic properties by now.Research status and application fields of the sintered Nd-Fe-B magnets were reviewed.Related theories about Nd-Fe-B permanent alloy and advanced production technologies of the sintered Nd-Fe-B magnets were introduced,and the technical characteristics of HILOP(Hitach low oxygen process),SC(strip casting),SPS(spark plasma sintering) etc were emphasized.The present existing problems and future research interests in our country were pointed out.