Patent ID: 6352599
Filing Date: 2002-03-05
Classification: B22F,B82Y,C04B,C22C,H01F

Abstract:
A permanent magnet material characterized by a chemical formula: (RE1âˆ’yLay)vFe100âˆ’vâˆ’wâˆ’xâˆ’zCow Mz Bx,whereinRE is at least one element selected from the group consisting of Pr and Nd; M is Cr; v is from about 9.5 to about 11.5 w is from about 5 to about 12 x is from about 9 to about 11.5 y is from about 0.05 to about 0.1 z is from about 2 to about 3 the magnet material having been made by rapid cooling from a molten state at a cooling rate between 104 to 107 degrees C./second to make a substantially amorphous material, followed by thermal treating at temperatures from about 600 to 750 degrees C. for 0.01 seconds to 120 minutes, the material containing the following phases: (i) a hard magnetic phase comprising at least one member of the group consisting of RE2Fe14B and RE2(Fe,Co)14B, (ii) a soft magnetic phase comprising at least one member of the group consisting of &agr;-Fe, Fe3B, and &agr;-(Fe,Co), (iii) one or more metal M boride precipitated phases.