| 简介 |
There is provided a method for producing a La—Co based ferrite magnet by using a polyhydric alcohol as a dispersant, the method capable of suppressing the composition deviation. The production method is a method for producing an M-type hexagonal ferrite sintered magnet that includes, as main constituents thereof, Fe, an element A (A including at least one element selected from Sr, Ba and Pb), an element R (R including at least one element selected from rare earth elements and Bi, and including La as an essential component) and an element Me (Me including Co or including Co and Zn), the method including a molding step of obtaining a molded body by pressure molding, in a magnetic filed in a predetermined direction, a slurry for molding prepared by dispersing a powder mainly composed of a ferrite in water as a dispersion medium and by adding a dispersant, and a sintering step of obtaining the ferrite sintered magnet by sintering the molded body, wherein when the dispersant is a polyhydric alcohol represented by the general formula Cn(OH)nHn+2, the concentration of B in the water to be used for preparing the slurry for molding is set at 1 ppm or less. |
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