Ferrite powders for bonded magnet, process for the production of the powders, and bonded magnet made by using the same
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United States of America Patent
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Dec 25, 2012
Grant Date -
Nov 25, 2010
app pub date -
Sep 26, 2008
filing date -
Sep 28, 2007
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Abstract
The present invention provides ferrite powders for bonded magnet capable of suppressing increase of SFD, while widening a particle size distribution for obtaining flowability and compressed density, and also capable of suppressing deterioration of orientation and magnetizability, and provides a process for a production magnetoplumbite-type ferrite powders containing an oxide of at least one or more kinds of transition metals selected from a group consisting of Zr, Ti, Zn, Co, Mn, and Ni, having a mean particle size of 0.20 μm or more and less than 5.00 μm, being the ferrite powders for bonded magnet with the ratio of particles having particle size of 1 μm or less being 20 mass % or more in the magnetoplumbite-type ferrite powder size distribution obtained by a laser diffraction type particle size distribution analyzer.
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