H - Electricity – 01 – F
Patent
H - Electricity
01
F
H01F 1/20 (2006.01) B22F 1/02 (2006.01) C23C 26/00 (2006.01) H01F 1/057 (2006.01) H01F 1/059 (2006.01) H01F 7/02 (2006.01) H01F 41/00 (2006.01)
Patent
CA 2133824
The material for permanent magnet according to the present invention comprises an acicular iron powder having successively on the surface (1) a coated layer of aluminum phosphate, (2) a diffused layer of rare earth element or a diffused layer of rare earth element?boron or a diffused layer of rare earth element?boron?nitrogen, and (3) a coated layer of aluminum phosphate. The material for permanent magnet can be produced by (a) a step of mixing and covering an acicular goethite (FeOOH) crystal with aluminum phosphate, (b) a step of preparing an acicular iron powder coated with a layer of aluminum phosphate by reducing under hydrogen atmosphere at 300-500°C the acicular goethite (FeOOH) crystal covered by the aluminum phosphate, (c) a step of diffusing a rare earth element or a rare earth element and boron into the surface layer of aluminum phosphate by heating under argon atmosphere at 650-1000°C the acicular iron powder coated with a layer of aluminum phosphate in the presence of the rare earth element or the rare earth element and boron, (d) a step of mixing and covering the rare earth element diffused powder or rare earth element and boron diffused powder with aluminum phosphate, and (e) a step of coating the rare earth element diffused powder or rare earth element and boron diffused powder with aluminum phosphate by heating under argon atmosphere at 300-500°C the rare earth element diffused powder or rare earth element and boron diffused powder covered by the aluminum phosphate.
Mccarthy Tetrault Llp
Takahashi Yasunori
LandOfFree
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