High-performance sintered ferrite magnet and preparation method thereof: Fid-Bau Portal

High-performance sintered ferrite magnet and preparation method thereof

WU XINYUAN

The invention discloses a high-performance sintered ferrite magnet and a preparation method thereof, and belongs to the technical field of rare earth magnetic materials. The method comprises the following steps: carrying out primary ball milling on preparation raw materials and water, drying, pre-sintering, crushing and sieving to obtain pre-sintered material particles, mixing the pre-sintered material particles with calcium carbonate, silicon dioxide, boric acid, kaolin and a dispersing agent, carrying out secondary ball milling, adding a magnetic field for orientation, carrying out wet compression molding to obtain a green body, and finally carrying out sintering molding to obtain the high-performance sintered ferrite magnet. Bearing steel balls are adopted for ball milling, and the magnetic performance of a product obtained through ball milling is obviously better than that of a product obtained through alloy steel ball milling; the preparation method comprises the following steps: selecting bearing steel balls of 6 mm and 4.8 mm according to a ratio of 4: 6, selecting the rotating speed of a ball mill to be 22r/min, and carrying out ball milling for 10 hours, so that the obtained slurry has the best magnetic performance and good particle size distribution, and can be used for preparing a high-performance sintered ferrite magnet.

本发明公开了一种高性能烧结铁氧体磁体及其制备方法，属于稀土磁材料技术领域。所述方法包括以下步骤：将制备原料和水经一次球磨后干燥、预烧、破碎过筛得到预烧料颗粒再与碳酸钙、二氧化硅、硼酸、高岭土和分散剂混合后二次球磨，加磁场取向后湿法压制成型得到生坯，最后烧结成型得到高性能烧结铁氧体磁体，本发明使用球磨采用轴承钢球，球磨所得产品的磁性能明显好于合金钢球球磨所得产品的磁性能；选择6mm与4.8mm轴承钢球按照4:6的比例配比,并将球磨机转速选定为22r/min,球磨10h,所获得的料浆磁性能最好,料浆粒度分布好，可以制备高性能烧结铁氧体磁体。

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