|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||428/167 ; 428/409 ; 428/900 ; 148/302 ; 148/306 ; 148/311 ; 148/313|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 7 인용 특허 : 7|
A permanent magnet material is prepared by cooling with a chill roll a molten alloy containing R wherein R is at least one rare earth element inclusive of Y, Fe or Fe and Co, and B. The chill roll has a plurality of circumferentially extending grooves in a circumferential surface, the distance between two adjacent ones of the grooves at least in a region with which the molten alloy comes in contact being 100 to 300 .mu.m on average in an arbitrary cross section containing a roll axis. Permanent magnet material of stable performance is obtained since the ...
[ What is claimed is:] [1.] A permanent magnet material having a plurality of longitudinally extending ridges on at least one major surface, the distance between two adjacent ones of the ridges being 100 to 300 .mu.m on average.