Method for manufacturing Sr ferrite particle for sintered magnet, method for using Sr ferrite particle, Sr ferrite sintered magnet and method for manufacturing same, and motor and generator
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United States of America Patent
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Dec 27, 2016
Grant Date -
May 7, 2015
app pub date -
Jun 7, 2013
filing date -
Jun 7, 2012
priority date (Note) -
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Abstract
Provided is a method for producing Sr ferrite particles for sintered magnets, the method includes: a mixing step of mixing an iron compound, a strontium compound, and an alkali metal compound which includes at least one of K and Na as a constituent element and which does not include Cl and S as the constituent element to prepare a mixture; and a calcining step of firing the mixture at 850° C. to 1100° C. to obtain Sr ferrite particles in which an average particle size of primary particles is 0.2 to 1.0 μm. In the mixing step, the alkali metal compound is mixed in such a manner that a total amount of K and Na becomes 0.03 to 1.05% by mass in terms of K2O and Na2O with respect to a total amount of a powder of the iron compound and a powder of the strontium compound.
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