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Preparation method of rare-earth-free garnet ferrite with high dielectric and high Curie temperature
The invention relates to a preparation method of rare-earth-free garnet ferrite with high dielectric constant and high Curie temperature, raw materials with different particle sizes basically reach the same particle size state by adopting raw material pretreatment, then a mixture with uniform components is obtained by mechanical stirring and primary granulation, and a relatively ideal pre-sintering effect can be subsequently realized. Meanwhile, by uniformly mixing three parts of two grinding materials with different pre-sintering temperatures and particle sizes, controlling the sintering activity of the powder and matching with a sintering process, the microstructure of a sintered body can be finally improved, the porosity of the ferrite material is reduced, and the ferromagnetic resonance line width is reduced. Through combined substitution of bismuth, zirconium and calcium elements and adjustment of a preparation process, the particle size of powder is regulated and controlled, the sintering stage is controlled to the end of continuous growth of crystal grains, the microstructure of the garnet ferrite material is improved, and finally the ferrite material with high dielectric constant, high saturation magnetization, low ferromagnetic resonance line width and high Curie temperature is prepared.
一种无稀土高介电高居里温度石榴石铁氧体的制备方法，采用原料预处理将不同粒径的原料基本达到同一种粒度状态，然后通过机械搅拌以及一次造粒得到成分均匀的混合料，后续可实现较为理想的预烧效果。同时，通过将三份不同预烧温度、粒度的二磨料均匀混合，控制粉料的烧结活性，并与烧结工艺相配合，最终可改善烧结体的微观结构，减少了铁氧体材料的气孔率，降低了铁磁共振线宽。本发明通过铋、锆、钙元素联合取代以及制备工艺的调整，调控粉料的粒度，控制烧结阶段至晶粒连续生长末期，改善石榴石铁氧体材料的显微结构，最终制得了高介电常数、高的饱和磁化强度、低的铁磁共振线宽、高的居里温度的铁氧体材料。
Preparation method of rare-earth-free garnet ferrite with high dielectric and high Curie temperature
The invention relates to a preparation method of rare-earth-free garnet ferrite with high dielectric constant and high Curie temperature, raw materials with different particle sizes basically reach the same particle size state by adopting raw material pretreatment, then a mixture with uniform components is obtained by mechanical stirring and primary granulation, and a relatively ideal pre-sintering effect can be subsequently realized. Meanwhile, by uniformly mixing three parts of two grinding materials with different pre-sintering temperatures and particle sizes, controlling the sintering activity of the powder and matching with a sintering process, the microstructure of a sintered body can be finally improved, the porosity of the ferrite material is reduced, and the ferromagnetic resonance line width is reduced. Through combined substitution of bismuth, zirconium and calcium elements and adjustment of a preparation process, the particle size of powder is regulated and controlled, the sintering stage is controlled to the end of continuous growth of crystal grains, the microstructure of the garnet ferrite material is improved, and finally the ferrite material with high dielectric constant, high saturation magnetization, low ferromagnetic resonance line width and high Curie temperature is prepared.
一种无稀土高介电高居里温度石榴石铁氧体的制备方法，采用原料预处理将不同粒径的原料基本达到同一种粒度状态，然后通过机械搅拌以及一次造粒得到成分均匀的混合料，后续可实现较为理想的预烧效果。同时，通过将三份不同预烧温度、粒度的二磨料均匀混合，控制粉料的烧结活性，并与烧结工艺相配合，最终可改善烧结体的微观结构，减少了铁氧体材料的气孔率，降低了铁磁共振线宽。本发明通过铋、锆、钙元素联合取代以及制备工艺的调整，调控粉料的粒度，控制烧结阶段至晶粒连续生长末期，改善石榴石铁氧体材料的显微结构，最终制得了高介电常数、高的饱和磁化强度、低的铁磁共振线宽、高的居里温度的铁氧体材料。
Preparation method of rare-earth-free garnet ferrite with high dielectric and high Curie temperature
一种无稀土高介电高居里温度石榴石铁氧体的制备方法
SUN KE (author) / WANG YUHANG (author) / LI LINGFENG (author) / JIANG XIAONA (author) / ZHANG FANGYUAN (author) / YU ZHONG (author) / ZHANG XIAOFENG (author) / WU CHUANJIAN (author) / LAN ZHONGWEN (author) / LI QIFAN (author)
2024-06-07
Patent
Electronic Resource
Chinese
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