Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hajime Nakamura0
Takehisa Minowa0
Date of Patent
April 12, 2011
0Patent Application Number
117831430
Date Filed
April 6, 2007
0Patent Primary Examiner
Patent abstract
A permanent magnet material is prepared by machining an anisotropic sintered magnet body having the compositional formula: Rx(Fe1-yCoy)100-x-z-aBzMa wherein R is Sc, Y or a rare earth element, M is Al, Cu or the like, to a specific surface area of at least 6 mm−1, heat treating in a hydrogen gas-containing atmosphere at 600-1,100° C. for inducing disproportionation reaction on the R2Fe14B compound, and continuing heat treatment at a reduced hydrogen gas partial pressure and 600-1,100° C. for inducing recombination reaction to the R2Fe14B compound, thereby finely dividing the R2Fe14B compound phase to a crystal grain size ≦1 μm.
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