Nickel-zinc ferrite material with high saturation magnetic flux density, high DC superposition, and high Curie temperature and its preparation method

A nickel-zinc ferrite, high DC superposition technology, applied in the field of electronic equipment and its preparation, can solve the problems of low application frequency and resistivity of magnetic cores, increased volume of inductors, etc., and achieves wide temperature application range, porosity The effect of reducing and stabilizing the DC superposition adaptability

Active Publication Date: 2017-10-24
RUYUAN DONGYANGGUANG MAGNETIC MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Nickel-zinc ferrite material with high saturation magnetic flux density, high DC superposition, and high Curie temperature and its preparation method
  • Nickel-zinc ferrite material with high saturation magnetic flux density, high DC superposition, and high Curie temperature and its preparation method
  • Nickel-zinc ferrite material with high saturation magnetic flux density, high DC superposition, and high Curie temperature and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Ingredients and spray granulation:

[0037] Weigh Fe 2 o 3: 50.0mol%; NiO: 26mol%; ZnO: 20.3mol%, CuO: 3.7mol% four kinds of raw materials, then add a certain proportion of deionized water in the sand mill for mixing and crushing, crushing for 30 minutes, and cyclic mixing for 10 Add a certain amount of PVA solution after 10 minutes for spray granulation.

[0038] 2. Pre-burning:

[0039] Put the spray material into the pre-fired furnace, and keep it warm at 840°C for 3 hours for pre-fired.

[0040] 3. Secondary sanding:

[0041] In calcined material, add the following auxiliary components by weight percentage of calcined material: 0.03wt% Bi 2 o 3 , 0.02wt% Nb 2 o 5 , 0.05wt% SnO 2 , 0.02wt%V 2 o 5 , 0.014wt% Co 2 o 3 . Then put the powder into a sand mill and add deionized water for secondary sand milling, the sand milling time is 65 minutes, and the particle size of the powder is controlled at 0.85-0.95 μm.

[0042] 4. Spray granulation and molding:...

Embodiment 2

[0051] 1. Ingredients and spray granulation:

[0052] Weigh Fe 2 o 3 : 51.2mol%; NiO: 25mol%; ZnO: 19.0mol%, CuO: 4.8mol% four kinds of raw materials, then add a certain proportion of deionized water in the sand mill for mixing and crushing, crushing for 30 minutes, and circulating mixing for 10 Add a certain amount of PVA solution after 10 minutes for spray granulation.

[0053] 2. Pre-burning:

[0054] Put the spray material into the pre-burning furnace, and keep it warm at 850°C for 3 hours for pre-burning.

[0055] 3. Secondary sanding:

[0056] In calcined material, add the following auxiliary components by weight percentage of calcined material: 0.03wt% Bi 2 o 3 , 0.03wt% Nb 2 o 5 , 0.06wt% SnO 2 , 0.03wt%V 2 o 5 , 0.024wt% Co 2 o 3 . Then put the powder into a sand mill and add deionized water for secondary sand grinding. The sand grinding time is 70 minutes, and the particle size of the powder is controlled at 0.85-0.95 μm.

[0057] 4. Spray granulation ...

Embodiment 3

[0066] 1. Ingredients and spray granulation:

[0067] Weigh Fe 2 o 3 : 48.5mol%; NiO: 27mol%; ZnO: 21.5mol%, CuO: 3mol% four kinds of raw materials, then add a certain proportion of deionized water in the sand mill for mixing and crushing, crushing for 30 minutes, and circulating mixing for 10 minutes Finally, a certain amount of PVA solution is added for spray granulation.

[0068] 2. Pre-burning:

[0069] Put the spray material into the pre-fired furnace, and keep it warm at 860°C for 3 hours for pre-fired.

[0070] 3. Secondary sanding:

[0071] In calcined material, add the following auxiliary components by weight percentage of calcined material: 0.03wt% Bi 2 o 3 , 0.04wt%Nb 2 o 5 , 0.03wt% SnO 2 , 0.05wt%V 2 o 5 , 0.010wt% Co 2 o 3 . Then put the powder into a sand mill and add deionized water for secondary sand milling. The sand milling time is 60 minutes, and the particle size of the powder is controlled at 0.85-0.95 μm.

[0072] 4. Spray granulation and ...

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Abstract

The invention relates to a nickel-zinc ferrite material with high saturation magnetic flux density, high DC superposition and high Curie temperature, which contains the following main components: 48-52 mol% of Fe2O3, 18-22mol% of ZnO, and 25% of NiO ~29mol%, the balance is CuO; relative to the total weight of the main component, it also contains the following subcomponents: Bi2O3 is 0.01~0.04wt%, Nb2O5 is 0.01~0.05wt%, SnO2 is 0.01~0.06wt%, V2O5 is 0.02 ~0.06 wt%. The nickel-zinc ferrite material of the present invention is particularly suitable for working at a higher frequency and lower voltage, and has a higher saturation magnetic flux density at room temperature and high temperature, and can also be used in DC superimposed large and highly integrated Realize more stable inductance function in complex applications.

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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 张凯傅膑张冬震李懿轩盘良三刘培元
Owner RUYUAN DONGYANGGUANG MAGNETIC MATERIAL
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