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Permanent magnetic ferrite pre-sintering material and preparation method thereof
The preparation method comprises the following steps: mixing an iron source, a strontium source, a calcium source, a lanthanum source and a cobalt source to obtain a mixture, adding a solvent, and carrying out first-stage wet ball milling to obtain a first-stage ball milling material; mixing ammonium citrate, sodium hexametaphosphate and the first-stage ball milling material, performing second-stage wet ball milling, and performing solid-liquid separation to obtain a second-stage ball milling material; and directly pre-sintering the secondary ball-milled material in a kiln at the temperature of 1180-1220 DEG C, and carrying out dry ball-milling crushing to obtain the permanent magnetic ferrite pre-sintered material. The particle size of the second-stage ball milling material is smaller than or equal to 0.65 mu m, the particle size distribution range is narrow, the particle morphology is regular and uniform, the fluidity is good, and ball forming is easy, and a pre-sintered material with the small particle size can be obtained by conducting traditional dry ball milling and smashing on the pre-sintered ball material; the slurry subjected to the second-stage wet ball milling is fine in granularity, narrow in distribution and good in activity, so that the pre-sintering temperature can be obviously reduced, and the energy consumption is reduced; the sintered permanent magnetic ferrite prepared from the permanent magnetic ferrite pre-sintering material provided by the invention has improved magnetic performance and orientation degree.
本发明提供了一种永磁铁氧体预烧料及其制备方法，铁源、锶源、钙源、镧源和钴源混合得到的混合料，加溶剂进行第一级湿式球磨，得到一级球磨料；将柠檬酸铵、六偏磷酸钠与一级球磨料混合后，进行第二级湿式球磨，经固液分离得到二级球磨料；二级球磨料在1180‑1220℃直接进窑预烧，经干式球磨粉碎得到永磁铁氧体预烧料。二级球磨料的粒径≤0.65μm，粒度分布范围窄，颗粒形貌规则、均一且流动性好易于成球，预烧后的球料经过传统的干式球磨粉碎即可得到粒径细小的预烧料；经第二级湿式球磨后的浆料粒度细、分布窄、活性好能显著降低预烧温度，减少能耗；利用本发明所述永磁铁氧体预烧料制备成的烧结永磁铁氧体，磁性能和取向度均得到提高。
Permanent magnetic ferrite pre-sintering material and preparation method thereof
The preparation method comprises the following steps: mixing an iron source, a strontium source, a calcium source, a lanthanum source and a cobalt source to obtain a mixture, adding a solvent, and carrying out first-stage wet ball milling to obtain a first-stage ball milling material; mixing ammonium citrate, sodium hexametaphosphate and the first-stage ball milling material, performing second-stage wet ball milling, and performing solid-liquid separation to obtain a second-stage ball milling material; and directly pre-sintering the secondary ball-milled material in a kiln at the temperature of 1180-1220 DEG C, and carrying out dry ball-milling crushing to obtain the permanent magnetic ferrite pre-sintered material. The particle size of the second-stage ball milling material is smaller than or equal to 0.65 mu m, the particle size distribution range is narrow, the particle morphology is regular and uniform, the fluidity is good, and ball forming is easy, and a pre-sintered material with the small particle size can be obtained by conducting traditional dry ball milling and smashing on the pre-sintered ball material; the slurry subjected to the second-stage wet ball milling is fine in granularity, narrow in distribution and good in activity, so that the pre-sintering temperature can be obviously reduced, and the energy consumption is reduced; the sintered permanent magnetic ferrite prepared from the permanent magnetic ferrite pre-sintering material provided by the invention has improved magnetic performance and orientation degree.
本发明提供了一种永磁铁氧体预烧料及其制备方法，铁源、锶源、钙源、镧源和钴源混合得到的混合料，加溶剂进行第一级湿式球磨，得到一级球磨料；将柠檬酸铵、六偏磷酸钠与一级球磨料混合后，进行第二级湿式球磨，经固液分离得到二级球磨料；二级球磨料在1180‑1220℃直接进窑预烧，经干式球磨粉碎得到永磁铁氧体预烧料。二级球磨料的粒径≤0.65μm，粒度分布范围窄，颗粒形貌规则、均一且流动性好易于成球，预烧后的球料经过传统的干式球磨粉碎即可得到粒径细小的预烧料；经第二级湿式球磨后的浆料粒度细、分布窄、活性好能显著降低预烧温度，减少能耗；利用本发明所述永磁铁氧体预烧料制备成的烧结永磁铁氧体，磁性能和取向度均得到提高。
Permanent magnetic ferrite pre-sintering material and preparation method thereof
一种永磁铁氧体预烧料及其制备方法
DING BOMING (author) / YE HUA (author) / HU LIANGQUAN (author)
2022-10-14
Patent
Electronic Resource
Chinese
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