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Preparation method of high-coercivity permanent magnet barium ferrite
The invention discloses a preparation method of high-coercivity permanent magnet barium ferrite, and belongs to the technical field of ferrite magnetic material preparation. The method comprises the following steps: oxidizing the super iron ore concentrate as a raw material into iron red, mixing the iron red with barium carbonate, drying, pelletizing, carrying out primary presintering, crushing the presintering material after presintering is finished, adding a secondary auxiliary material, mixing, carrying out secondary ball milling, pressing into a blank after ball milling is finished, and carrying out secondary sintering at a relatively low temperature. According to the method, silicon dioxide impurities contained in the super iron ore concentrate and Fe2O3 form a low-melting-point substance, so that the reaction temperature is reduced, and the solid-phase reaction is promoted; meanwhile, Si < 4 + > ions play a pinning role at the grain boundary, the magnetic domain steering energy is improved, the coercive force of the barium ferrite is effectively improved, and finally the permanent magnet barium ferrite with the coercive force up to 250 kA/m or above can be prepared.
本发明公开了一种高矫顽力永磁钡铁氧体的制备方法，属于铁氧体磁性材料制备技术领域。本发明以超级铁精矿为原料，将超级铁精矿氧化成铁红以后，与碳酸钡混后，烘干造球进行一次预烧，预烧结束后将预烧料破碎，加入二次辅料后混合再进行二次球磨，球磨结束后压制成毛坯在较低的温度下进行二次烧结。本发明利用超级铁精矿自带的二氧化硅杂质，与Fe2O3形成低熔点物质，从而降低反应温度，促进固相反应；同时Si4+离子在晶界处起到“钉扎”效益，提高磁畴转向能量，有效的提高了钡铁氧体的矫顽力，最终可制得矫顽力高达250kA/m以上的永磁钡铁氧体。
Preparation method of high-coercivity permanent magnet barium ferrite
The invention discloses a preparation method of high-coercivity permanent magnet barium ferrite, and belongs to the technical field of ferrite magnetic material preparation. The method comprises the following steps: oxidizing the super iron ore concentrate as a raw material into iron red, mixing the iron red with barium carbonate, drying, pelletizing, carrying out primary presintering, crushing the presintering material after presintering is finished, adding a secondary auxiliary material, mixing, carrying out secondary ball milling, pressing into a blank after ball milling is finished, and carrying out secondary sintering at a relatively low temperature. According to the method, silicon dioxide impurities contained in the super iron ore concentrate and Fe2O3 form a low-melting-point substance, so that the reaction temperature is reduced, and the solid-phase reaction is promoted; meanwhile, Si < 4 + > ions play a pinning role at the grain boundary, the magnetic domain steering energy is improved, the coercive force of the barium ferrite is effectively improved, and finally the permanent magnet barium ferrite with the coercive force up to 250 kA/m or above can be prepared.
本发明公开了一种高矫顽力永磁钡铁氧体的制备方法，属于铁氧体磁性材料制备技术领域。本发明以超级铁精矿为原料，将超级铁精矿氧化成铁红以后，与碳酸钡混后，烘干造球进行一次预烧，预烧结束后将预烧料破碎，加入二次辅料后混合再进行二次球磨，球磨结束后压制成毛坯在较低的温度下进行二次烧结。本发明利用超级铁精矿自带的二氧化硅杂质，与Fe2O3形成低熔点物质，从而降低反应温度，促进固相反应；同时Si4+离子在晶界处起到“钉扎”效益，提高磁畴转向能量，有效的提高了钡铁氧体的矫顽力，最终可制得矫顽力高达250kA/m以上的永磁钡铁氧体。
Preparation method of high-coercivity permanent magnet barium ferrite
一种高矫顽力永磁钡铁氧体的制备方法
LI XIN (author) / PEI XIAODONG (author) / WANG FAN (author) / OUYANG JIANTAO (author) / QIU WEIGUO (author) / QIAN YOUJUN (author) / SHE SHIJIE (author) / LIU CHEN (author)
2023-11-28
Patent
Electronic Resource
Chinese
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