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
US9530548B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 2013 |
| Grant date | Dec 27, 2016 |
| Priority date | — |
| Expiry date | Aug 21, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.