Patent ID: 6478889
Filing Date: 2002-11-12
Classification: B82Y,H01F

Abstract:
An iron-base alloy permanent magnet powder represented by a general formula, Fe100-x-yRxBy, wherein:R is at least one kind of rare earth element selected from the group consisting of Pr, Nd, Dy, and Th; x and y satisfy the relationships of 1 at %&lE;x&lE;6 at %, and 15 at %&lE;y&lE;25 at %; the powder contains iron, an alloy of iron and boron, and a compound having a R2Fe14B crystal structure as component phases, the average crystal grain sizes of said component phases being 150 nm or less, the average particle size of the powder is 300 &mgr;m or less, and a ratio of minor axis size to major axis size of powder particles is in a range of 0.3 to 1.0.