Nano ferrite material, and preparation method thereof

Abstract

The invention discloses a nano ferrite material, and a preparation method thereof. The preparation method comprises following steps: 1) Fe(NO3)3, Zn(NO3)2, Ni(NO3)2, and Cu(NO3)2 are taken as initial raw materials, the weight of the materials is calculated based on a molecular formula Ni(1-a-b)ZnaCubFecO4, and a mixed metallic nitrate solution is prepared, wherein 0.4<=a<=0.45, 0.15<=b<=0.2, and 1.9<=c<=1.96; 2), a NaOH solution with a molar concentration ranging from 1 to 10mol / L is added into the mixed metallic nitrate solution so as to obtain a precipitate; 3), hydro-thermal synthesis is carried out; 4), the precipitate is washed and dried; 5) Bi2O3 with a weight ratio ranging from 0.05 to 0.5wt% and MoO3 with a weight ratio ranging from 0.05 to 0.2wt% are added, an obtained mixture is subjected to ball milling and drying, and a binder is added for pelleting; and 6) compacting and sintering are carried out. The nano ferrite material is high in magnetic conductivity and saturation magnetic induction intensity; and a crystal grain structure is uniform and fine.

Description

【Technical field】 [0001] The invention relates to a ferrite material and a preparation method thereof, in particular to a nanometer ferrite material and a preparation method thereof. 【Background technique】 [0002] Multilayer chip inductors are widely used in the fields of computers, mobile communications, and automotive electronics due to their small size, excellent shielding performance, and easy surface mounting. In recent years, with the rapid development of electronic terminals, the performance requirements for multilayer chip inductor devices have become higher and higher, and device miniaturization, high frequency, and high current have become technical requirements. At present, multilayer chip inductors mainly use NiCuZn ferrite material as the main body. For the material, how to further improve the initial magnetic permeability and saturation magnetic induction becomes the key. [0003] The publication number is CN104193317A, and the publication date is December 10...

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Problems solved by technology

In this scheme, the NiCuZn ferrite material is prepared by the solid state reaction method. On the one hand, it is necessary to add a large amount of flux to reduce the sintering temperature, so as to achieve co-firing with the Ag inner electrode; on the other hand, the obtained ferrite material The initial permeability μ i (μ i Between 65 and 70) and saturation magnetic induction B s Often low, and the grain size is too large, it is difficult to meet the requirements of high magnetic permeability

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