| 摘要 |
Disclosed herein is a magnetic powder which can provide magnets 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-zByMz (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 rho ÄMg/m<3>Ü, the maximum magnetic energy product (BH)maxÄkJ/m<3>Ü of the bonded magnet at a room temperature satisfies the relationship represented by the formula (BH)max/ rho <2>Äx10<-9>J.m<3>/g<2>Ü ≥ 2.10, and the intrinsic coercive force HCJ of the bonded magnet at a room temperature is in the range of 400 - 760 kA/m. <IMAGE>
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