Process for producing permanent magnets and products thereof

Details Process for producing permanent magnets and products thereof Process for producing permanent magnets and products thereof

C - Chemistry, Metallurgy

21

D

148/5, 317/29.8

C21D 8/12 (2006.01) B22F 1/00 (2006.01) B22F 3/24 (2006.01) C22C 1/04 (2006.01) H01F 1/057 (2006.01)

Patent

CA 1235631

- 69 - ABSTRACT Process for Producing Permanent Magnets and Products Thereof A process for producing permanent magnet materials, which comprises the steps of: forming an alloy powder having a mean particle size of 0.3-80 microns and composed of, in atomic percentage, 8-30 % R (provided that R is at least one of rare earth elements including Y), 2-28 % B, and the balance being Fe and inevitable impurities, sintering the formed body at a temperature of 900-1200°C, subjecting the sintered body to a primary heat treatment at a temperature of 750-1000°C, then cooling the resultant body to a temperature of no higher than 680°C at a cooling rate of 3-2000°C/min, and further subjecting the thus cooled body to a secondary heat treatment at a temperature of 480-700°C MGOe, 40 MGOe, or higher energy product can be obtained with specific compositions.

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