Compositions – Magnetic – Free metal or alloy containing
Reexamination Certificate
2005-10-04
2005-10-04
Sheehan, John P. (Department: 1742)
Compositions
Magnetic
Free metal or alloy containing
C252S062540, C148S302000
Reexamination Certificate
active
06951625
ABSTRACT:
Disclosed herein is a magnetic powder which can provide magnet having excellent magnetic properties and having excellent reliability especially excellent heat stability. The magnetic powder is composed of an alloy composition represented by Rx(Fe1-aCoa)100-x-y-z-wByMz(where R is at least one kind of rare-earth element excepting Dy, M is at least one kind of element selected from Ti, Cr, Nb, V, Mo, Hf, W, Mn, Zr and Dy, x is 7.1-9.9at%, y is 4.6-8.0at%, z is 0.1-3.0at%, and a is 0-0.30), and the magnetic powder being constituted from a composite structure having a soft magnetic phase and a hard magnetic phase, wherein when the magnetic powder is mixed with a binding resin and then the mixture is subjected to injection molding or extrusion molding to form a bonded magnet having a density ρ[Mg/m3], the maximum magnetic energy product (BH)max[kJ/m3] of the bonded magnet at a room temperature satisfies the relationship represented by the formula (BH)max/ρ2[x10-9J·m3/g2] ≧ 2.10, and the intrinsic coercive force HCJof the bonded magnet at the room temperature is in the range of 400-760 kA/m.
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Arai Akira
Kato Hiroshi
Harness & Dickey & Pierce P.L.C.
Seiko Epson Corporation
Sheehan John P.
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