| 简介 |
PROBLEM TO BE SOLVED : To provide a manufacturing method of inhibiting deviation in composition when manufacturing a LaCo-based ferrite magnet using polyhydric alcohol as a dispersant.
SOLUTION : The manufacturing method for a ferrite sintered magnet mainly containing Fe, an element A (where A is at least one kind of element selected among Sr, Ba and Pb), an element R (where R is at least one kind selected among rare earth elements and Bi and always containing La) and an element Me (where Me is Co or Co and Zn) includes a molding step for dispersing a powder mainly comprising ferrite in water as a dispersion medium and obtaining a molding by pressure-forming molding slurry with a dispersant added in a magnetic field in a predetermined direction, and a sintering step for obtaining the ferrite sintered magnet by sintering the molding. When the dispersant is polyhydric alcohol expressed by a general formula of Cn(OH)nHn+2, B concentration in the water used in preparing the molding slurry is ≤1 ppm.
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