Low-temperature-coefficient high-impedance high-magnetic-permeability manganese zinc ferrite material and preparation method thereof

Abstract

The invention discloses low-temperature-coefficient high-impedance high-magnetic-permeability manganese zinc ferrite material and a preparation method thereof, and belongs to the technical field of ferrite material preparation. The material comprises the components as follows: main components and at least two additives, wherein the main components comprise the following ingredients: 52.0 to 54.0 mol% of Fe2O3, 19.0 to 24.0 mol% of ZnO, 0.01 to 0.05 mol% of NiO, and the balance of MnO; the additives comprises the following ingredients: 0.01 to 0.08 wt% of CaCO3, 0.01 to 0.10 wt% of MoO3, 0.01 to 0.08 wt% of nano TiO2, 0.01 to 0.04 wt% of Bi2O3, 0.005 to 0.02 wt% of SiO2, 0.01 to 0.12 wt% of V2O5, 0.005 to 0.04 wt% of Nb2O5 and 0.005 to 0.04 wt% of B2O3. According to the invention, the material is uniform in size, obvious in grain boundary, and fewer in gas pores.

Description

technical field [0001] The invention belongs to the technical field of ferrite material preparation, and in particular relates to a high magnetic permeability MnZn ferrite material with low temperature coefficient, high impedance and excellent frequency characteristics and a preparation method thereof. Background technique [0002] With the rapid development of information technology, the electronic system is developing towards miniaturization and light weight, which requires the MnZn ferrite material used in it to have high magnetic permeability and high saturation magnetic induction. At the same time, in order to avoid the environment The troubles of various electromagnetic interference require various devices to have strong anti-electromagnetic interference (EMI) capabilities, which requires the materials used in these devices to have high impedance characteristics to have good anti-EMI performance; at the same time, Due to the complex changes in the surrounding environme...

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Problems solved by technology

For example, the magnetic permeability μ of H5C5 at 10kHz announced by TDK i It can reach 30000, but after the frequency increases μ i Then it drops rapidly, and the Curie temperature is less than 110°C; the patent (CN200810060242.4) discloses a high magnetic permeability soft ferrite material and its manufacturing method, and its 10kHz and 100kHz magnetic permeability reach 18000 and 14000 respectively, and the Curie temperature Also ≥125°C, which can meet the requirements of high magnetic permeability and high Curie temperature very well, but the impedance characteristics, magnetic permeability temperature characteristics and magnetic permeability frequency characteristics of the material are not given in the results; patent (CN200710071536.2 ) published a high-permeability MnZn ferrite and its preparation method, its magnetic permeability at 10kHz is 10000, and its impedance in the range of 100kHz-2MHz is 1.0-30kΩ, but it does not provide the frequency characteristics of magnetic permeability and its temperature Characteristics; the patent (CN201010224543.3) announced the wide-temperature high-permeability manganese-zinc soft magnetic ferrite material and its magnetic core and its preparation method, but the impedance characteristics and permeability frequency of the material were not given in the results Characteristics; Patent (CN201110230616.4) discloses a manufacturing method of a broadband high-conductivity manganese-zinc ferrite core, whose magnetic permeability can reach 13000 below 100kHz, and does not provide the necessary impedance characteristics, magnetic permeability Results of temperature characteristics, magnetic permeability frequency characteristics

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