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Additive for preparing permanent magnetic ferrite pre-sintering material and application of additive
The invention discloses an additive for preparing a permanent magnetic ferrite pre-sintering material and application of the additive, and belongs to the technical field of magnetic material preparation, and the additive is composed of NaOH and Na2SiO3. The addition amount of the caustic soda is 0.01 wt%-0.5 wt%, and the addition amount of the sodium silicate is 0.01 wt%-0.25 wt%. The combined additive is added before fine grinding and uniform mixing of raw materials, caustic soda serves as an ion binding agent and is combined with chloride ions in the iron oxide red raw materials to generate sodium chloride, and on one hand, equipment corrosion and environmental pollution caused by volatilization of the chloride ions in the form of hydrogen chloride in the high-temperature pre-sintering process can be avoided; on the other hand, deviation of chemical components of the ferrite caused by the fact that valuable metal such as iron or strontium is taken away when chloride ions volatilize can be avoided. Sodium silicate can effectively reduce the pre-sintering temperature, avoids excessive growth of crystal grains, is beneficial to uniformity of a ferrite microstructure, exists in the ferrite as a second phase, is beneficial to formation of a ferrite single-domain particle size structure, and further improves the coercive force of the magnet.
本发明公开了一种制备永磁铁氧体预烧料的添加剂及其应用，属于磁性材料制备技术领域，所述添加剂由NaOH和Na2SiO3组成。苛性钠的添加量为0.01wt％～0.5wt％，硅酸钠的添加量为0.01wt％～0.25wt％。在原料细磨混匀前添加本发明的组合添加剂，其中苛性钠作为离子结合剂，与铁红原料中的氯离子结合生成氯化钠，一方面可避免氯离子在高温预烧过程中以氯化氢的形式挥发造成设备腐蚀和环境污染，另一方面可避免氯离子挥发时带走有价金属如铁或者锶而造成铁氧体的化学成分发生偏移。硅酸钠可有效降低预烧温度，避免晶粒过度长大，有利于铁氧体微观组织的均一性，其作为第二相存在于铁氧体中，有利于铁氧体单畴粒径组织的形成，进而提升磁体矫顽力。
Additive for preparing permanent magnetic ferrite pre-sintering material and application of additive
The invention discloses an additive for preparing a permanent magnetic ferrite pre-sintering material and application of the additive, and belongs to the technical field of magnetic material preparation, and the additive is composed of NaOH and Na2SiO3. The addition amount of the caustic soda is 0.01 wt%-0.5 wt%, and the addition amount of the sodium silicate is 0.01 wt%-0.25 wt%. The combined additive is added before fine grinding and uniform mixing of raw materials, caustic soda serves as an ion binding agent and is combined with chloride ions in the iron oxide red raw materials to generate sodium chloride, and on one hand, equipment corrosion and environmental pollution caused by volatilization of the chloride ions in the form of hydrogen chloride in the high-temperature pre-sintering process can be avoided; on the other hand, deviation of chemical components of the ferrite caused by the fact that valuable metal such as iron or strontium is taken away when chloride ions volatilize can be avoided. Sodium silicate can effectively reduce the pre-sintering temperature, avoids excessive growth of crystal grains, is beneficial to uniformity of a ferrite microstructure, exists in the ferrite as a second phase, is beneficial to formation of a ferrite single-domain particle size structure, and further improves the coercive force of the magnet.
本发明公开了一种制备永磁铁氧体预烧料的添加剂及其应用，属于磁性材料制备技术领域，所述添加剂由NaOH和Na2SiO3组成。苛性钠的添加量为0.01wt％～0.5wt％，硅酸钠的添加量为0.01wt％～0.25wt％。在原料细磨混匀前添加本发明的组合添加剂，其中苛性钠作为离子结合剂，与铁红原料中的氯离子结合生成氯化钠，一方面可避免氯离子在高温预烧过程中以氯化氢的形式挥发造成设备腐蚀和环境污染，另一方面可避免氯离子挥发时带走有价金属如铁或者锶而造成铁氧体的化学成分发生偏移。硅酸钠可有效降低预烧温度，避免晶粒过度长大，有利于铁氧体微观组织的均一性，其作为第二相存在于铁氧体中，有利于铁氧体单畴粒径组织的形成，进而提升磁体矫顽力。
Additive for preparing permanent magnetic ferrite pre-sintering material and application of additive
一种制备永磁铁氧体预烧料的添加剂及其应用
XU BIN (author) / GAO BINGYU (author) / ZHOU YUJUAN (author) / FU ZHONGYUAN (author) / CHEN YUFENG (author) / HUANG LINQUAN (author) / ZHANG SHIFENG (author) / ZHU XIAONING (author)
2024-08-20
Patent
Electronic Resource
Chinese
Permanent magnetic ferrite pre-sintering material and preparation method thereof
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