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A platform for research: civil engineering, architecture and urbanism
The invention discloses a low-radial shrinkage ratio permanent magnetic ferrite magnet and a preparation method thereof and belongs to the field of permanent magnetic material. The magnet has hexagonal main phase and is composed of metal element expressed by SrxCayLa1-x-y FezCom, wherein x is more than or equal to 0.2 and less than or equal to 0.8, y is more than or equal to 0.1 and less than or equal to 0.4, z is more than or equal to 9.0 and less than or equal to 11.0, m is more than or equal to 0.1 and less than or equal to 0.2, and y/m is more than or equal to 1.5 and less than or equal to 2.0; and meanwhile, through using with secondary additive, the Br thereof arrives at 4200 Gs to 4600 Gs, the Hcj arrives at 4000 Oe to 5600 Oe, and the rectangular degree Hk/HCJ is higher than 0.90. According to the low-radial shrinkage ratio permanent magnetic ferrite magnet and the preparation method thereof, through controlling the content of primary pre-sintering powder and the silicon of the secondary additive, the radial shrinkage ratio of the sintered magnet is 1.10 to 1.12, the production efficiency of the sintering process is improved, the production cost is lowered, and the large industrial production demand is satisfied.
The invention discloses a low-radial shrinkage ratio permanent magnetic ferrite magnet and a preparation method thereof and belongs to the field of permanent magnetic material. The magnet has hexagonal main phase and is composed of metal element expressed by SrxCayLa1-x-y FezCom, wherein x is more than or equal to 0.2 and less than or equal to 0.8, y is more than or equal to 0.1 and less than or equal to 0.4, z is more than or equal to 9.0 and less than or equal to 11.0, m is more than or equal to 0.1 and less than or equal to 0.2, and y/m is more than or equal to 1.5 and less than or equal to 2.0; and meanwhile, through using with secondary additive, the Br thereof arrives at 4200 Gs to 4600 Gs, the Hcj arrives at 4000 Oe to 5600 Oe, and the rectangular degree Hk/HCJ is higher than 0.90. According to the low-radial shrinkage ratio permanent magnetic ferrite magnet and the preparation method thereof, through controlling the content of primary pre-sintering powder and the silicon of the secondary additive, the radial shrinkage ratio of the sintered magnet is 1.10 to 1.12, the production efficiency of the sintering process is improved, the production cost is lowered, and the large industrial production demand is satisfied.
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