Bond magnet and ferrite magnetic powder for bond magnet
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United States of America Patent
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Aug 14, 2007
Grant Date -
Oct 28, 2004
app pub date -
Apr 22, 2004
filing date -
Apr 24, 2003
priority date (Note) -
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Abstract
A ferrite magnetic powder for bond magnet that experiences only small decrease in coercivity when molded into a bond magnet is provided, which is a ferrite magnetic powder that includes an alkaline-earth metal constituent and exhibits a decrease in coercivity of not greater than 600 Oe when subjected to a prescribed molding test. The magnetic powder can be obtained by mixing a fine ferrite powder of an average particle diameter of greater than 0.50 to 1.0 .mu.m and a coarse ferrite powder of an average particle diameter of greater than 2.50 to 5.0 .mu.m at ratio to incorporate the fine powder at a content ratio of 15-40 wt %.
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