低烧超高磁导率Ni-Zn-Cu铁氧体研究

Investigation of Low-Temperature Sintering Ni- Zn- Cu Ferrites with Ultra-High Permeability

采用凝胶自燃法制备超细高活性Ｎｉ─Ｚｎ─Ｃｕ铁氧体粉。利用 ＴＥＭ、ＳＥＭ、ＸＲＤ与 ＨＰ４１９４Ａ研究了粉末及烧结铁氧体的显微结构、形貌、晶粒尺寸、组成相与性能的关系。所获得不加助熔剂的 Ｎｉ—Ｚｎ—Ｃｕ烧结铁氧体具有低烧（≤９００℃）、高性能的特点，主要磁性能指标如下：μｉ８７０℃＝５００，μ９００℃＝９００，品质因数大于５，截止频率约１０ＭＨｚ。材料的磁化主要源于畴壁位移。

Ni-Zn-Cu ferrite powder with ultra- fine grain size and high reactivity was obtained by gel self- propagating method. The relationship between component, microstructure, grain size and properties was studied by XRD.TEM, SEM and HP4194 impedance analyzer. The ferrite sample could be sintered under 900℃ without dopant, Its properties were as follow:pia:ot = 500'μi900℃= 900, quality factor ≥5. cutoff frequencies were about 10MHz. The magnetism mainly result from domain wall motion.