Rotating machine, bonded magnet, magnet roll, and method for producing sintered ferrite magnet
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United States of America Patent
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Aug 20, 2013
Grant Date -
Aug 23, 2012
app pub date -
Aug 17, 2011
filing date -
Mar 10, 2006
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Abstract
A method for producing a sintered ferrite magnet having an M-type ferrite structure and represented by: Ca1−x−yRxBayFe2n-zCoz, (by atomic ratio), where 0.3≦1−x−y≦0.65, 0.2≦x≦0.65, 0.001≦y≦0.2, 0.03≦z≦0.65, 4≦n≦7, and 1−x−y>y. The method includes mixing a Ca compound, an R element compound, a Ba compound, an iron compound and a Co compound as starting materials; calcining the starting materials to obtain calcined bodies; pulverizing the calcined bodies to obtain a calcined powder; providing recycled materials having an M-type ferrite structure and being represented by the above formula; pulverizing the recycled materials to obtain a recycled material powder; mixing the recycled material powder with the calcined powder to form a moldable material; molding the moldable material to obtain green bodies; and sintering the green bodies to obtain the sintered ferrite magnet.
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