Method of making permanent magnets

Details Method of making permanent magnets Method of making permanent magnets

H - Electricity

01

F

H01F 1/053 (2006.01) B22F 1/02 (2006.01) B22F 9/08 (2006.01) H01F 1/057 (2006.01)

Patent

CA 2070808

2070808 9206479 PCTABS00011 A method for making an isotropic permanent magnet comprises atomizing a melt of a rare earth-transition metal alloy (e.g., an Nd-Fe-B alloy enriched in Nd and B) under conditions to produce protectively coated, rapidly solidified, generally spherical alloy particles wherein a majority of the particles are produced/size classified within a given size fraction (e.g. 5 to 40 microns diameter) exhibiting optimum as-atomized magnetic properties and subjecting the particles to concurrent elevated temperature and elevated isotropic pressure for a time effective to yield a densified, magnetically isotropic magnet compact having enhanced magnetic properties and mechanical properties. The figure illustrates schematically the method of the present invention.

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