Sintered ferrite magnet and its production method
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United States of America Patent
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Jul 26, 2016
Grant Date -
Oct 31, 2013
app pub date -
Dec 26, 2011
filing date -
Dec 28, 2010
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Abstract
A sintered ferrite magnet having a main phase composed of ferrite having a hexagonal, M-type magnetoplumbite structure, a grain boundary phase containing Si and Ca with a lower atomic ratio of La than in said main phase, and a third phase containing La at a higher atomic ratio than in said main phase, and a method for producing a sintered ferrite magnet having said third phase by calcining starting materials with more La than Ca, adding more than 1% and 1.8% or less by mass of SiO2 and 1-2% by mass (calculated as CaO) of CaCO3 to the calcined body, and pulverizing, molding and sintering it.
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