【摘要】 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。更多还原

【Abstract】 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.更多还原