Patent ID: 6780255
Filing Date: 2004-08-24
Classification: B22F,C01B,C01P,C22C,H01F

Abstract:
A process for producing a permanent magnet material comprising Smâ€”Feâ€”N based alloy powder, comprising:allowing a precipitate containing Sm and Fe to co-precipitate from a solution in which Sm and Fe are dissolved; calcining the precipitate to form a metal oxide; mixing the metal oxide with a metal reducing agent; reducing and diffusing the metal oxide mixed with the metal reducing agent into Smâ€”Fe alloy powder; and nitriding the Smâ€”Fe alloy powder to obtain said Smâ€”Feâ€”N based alloy powder, wherein said Smâ€”Feâ€”N based alloy powder has a particle shape of an average degree of roundness of not less than 85%.