Sol-Gel法NiCuZn铁氧体的磁导率、烧结特性及晶粒生长

Permeability, Sintering Behavior and Grain Growth of Low Temperature Sintered NiCuZn Ferrite Prepared by Sol-Gel Method

用溶胶-凝胶法制备了Ni1-a-xZnxCuaFe2O4(0.15≤a<0.25,0.1≤x≤0.65)铁氧体超细粉。研究了材料的烧结特性,给出了烧结样品的起始磁导率μi、表观密度d、收缩率η、比饱和磁化强度σs等随烧结温度的变化。由烧结样品形貌分析SEM照片讨论了起始磁导率与晶粒尺寸等显微结构因素的关系,以及细晶粒和异常晶粒的生长过程。获得了在880±20℃烧结温度下μi>1000的良好性能。

The fine powder of Ni1-a-xZnxCuaFe2O4 （0.15≤a〈0.25, 0.1≤x≤0.65） ferrite was prepared by sol-gel method. The measurements in electromagnetic properties for the sintered specimens were carried out, including the initial permeability μi, loss factor tanδ/μi, temperature curve of μi, Curie temperature Tc and saturation magnetization Ms The plots of initial permeability μi, the density d and the shrinkage factor η vs sintering temperature are shown and discussed. The SEM photographs of sintered specimens for various sintering temperatures and duration times are presented. The NiCuZn ferrites with μi〉1000 at sintering temperature 880± 20℃ were obtained.