Nickel-zinc ferrite material having high saturation magnetic flux density, high direct current superposition, and high Curie temperature, and preparation method thereof

Abstract

The invention relates to a nickel-zinc ferrite material having a high saturation magnetic flux density, high direct current superposition, and high Curie temperature. The material comprises the following main components in percentage by weight: 48 to 52 mol% of Fe2O3, 18 to 22 mol% of ZnO, 25 to 29 mol% of NiO, and the balance being CuO; and also comprises the following auxiliary components in percentage by weight: 0.01 to 0.04 wt% of Bi2O3, 0.01 to 0.05 wt% of Nb2O5, 0.01 to 0.06 wt% of SnO2, and 0.02 to 0.06 wt% of V2O5. The provided nickel-zinc ferrite material is especially suitable for being used under a high and broad frequency and low voltage, has a high saturation magnetic flux density no matter at a high temperature or a low temperature, and is capable of achieving a more stable electrical induction function under a complicated application occasion with a large direct current superposition and high integration level.

Description

technical field [0001] The present invention relates to electronic equipment and its preparation, more specifically, the present invention relates to a magnetic material and its preparation method. Background technique [0002] With the continuous development of social informatization, the demand for high frequency (such as 10KHz-10MHz), high efficiency, and miniaturization of electronic products and devices is increasingly strong, and more and more requirements are put forward for the various performances of high frequency ferrite materials. Come higher requirements: [0003] Generally speaking, soft magnetic ferrite materials mainly include manganese zinc ferrite and nickel zinc ferrite. Among them, compared with nickel-zinc ferrite, manganese-zinc ferrite has the characteristics of higher saturation magnetic flux density Bs and higher initial permeability μi. However, because the grain structure of manganese-zinc material is dense, the resistivity is generally at 10 3 ...

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Problems solved by technology

Among them, compared with nickel-zinc ferrite, manganese-zinc ferrite has the characteristics of higher saturation magnetic flux density Bs and higher initial permeability μi. However, because the grain structure of manganese-zinc material is dense, the resistivity is generally at 10 3 Below the order of Ωm, the magnetization process is dominated by domain wall displacement, and domain wall resonance occurs at low frequencies, so the application frequency and resistivity of manganese zinc ferrite cores are low, and electronic equipment is increasingly miniaturized and high frequency Under the trend of the trend, the magnetic core of the inductance element is easy to have a high-voltage breakdown with the copper core wire close to it; for this reason, a considerable insulation distance must be maintained between the magnetic core and the coil terminal and the lead-out wire, or a tight insulation distance must be adopted. Insulation measures must be taken to ensure the necessary insulation withstand voltage, but this will inevitably lead to an increase in the size of the inductor; moreover, ferrite devices operating at high frequencies must consider the cut-off frequency and eddy current loss of the material. , the eddy current loss of the material will increase rapidly

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