Toda Kogyo Corporation

Masaaki Hamano

Minoru Yamasaki

Akira Takeuchi

Yuji Omote

Akihisa Indue

Hirotaka Mizuguchi

Lamellar rare earth-iron-boron-based magnet alloy particles for a bonded magnet, having an intrinsic coercive force (iHc) of not less than 3.5 kOe, a residual magnetic flux density (Br) of not less than 9.5 kG, and a maximum energy product ((BH) ) of not less than 13 MGOe. These particles have an average major axial diameter of 60 to 500 &mgr;m, an average minor axial diameter of 50 to 460 &mgr;m, an average axis ratio (major axial diameter/minor axial diameter) of 1.1 to 10 and an average aspect ratio (major axial diameter/thickness) of 3 to 100. The magnet alloy particles have a residual magnetic flux density (Br) as high as not less than 10 kG, an intrinsic coercive force (iHc) as large as not less than 3.5 kOe and a maximum energy product ((BH) ) as large as not less than 13 MGOe, are used as a material for high-performance bonded magnets.

Lamellar rare earth-iron-boron-based magnet alloy particles, process for producing the same and bonded magnet produced therefrom

A rare earth bonded magnet obtained by mixing two types of magnetic powders (A) and (B) in the present invention has a high residual magnetic flux density (Br), a large intrinsic coercive force (iHc) and a large maximum energy product ((BH)max) in spite of a low rare earth element content, and shows an excellent rust preventability. A rare earth-iron-boron type magnet alloy of the present invention has a residual magnetic flux density (Br) as high as not less than 10 kG, an intrinsic coercive force (iHc) as large as not less than 3.5 kOe and a large maximum energy product ((BH)max) and which has an excellent rust preventability.

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Hiroshima, Japan

Masaaki Hamano