Ferrite Magnetic Powder for Bond Magnet and Manufacturing Method of the Same, and Bond Magnet
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United States of America Patent
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Issued Date -
Sep 16, 2010
app pub date -
Mar 6, 2007
filing date -
Mar 31, 2006
priority date (Note) -
Abandoned
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Abstract
To provide ferrite magnetic powders for bond magnet capable of surely suppressing residual hexavalent chrome, being an environmental load substance, having no adverse influence on the magnetic characteristics, which is an obstacle in use, and without damaging productivity and at a low cost. The method includes the steps of obtaining sintered powders by sintering raw material powders; wet-pulverizing the sintered powders; wet-cleaning the sintered powders; and annealing the cleaned sintered powders, wherein in the step of the wet-pulverization and in the step of wet-cleaning, generation of the hexavalent chrome, being an environmental load substance, is suppressed by performing the pulverization and cleaning while maintaining pH of a dispersion solvent at 8.5 or less, at the time of pulverization and cleaning.
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