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A nickel-zinc ferrite material with high frequency, high magnetic permeability and high q value and its preparation method

A technology of nickel-zinc ferrite and high magnetic permeability, applied in the field of soft magnetic ferrite, can solve the problems of low Q value, low high-frequency magnetic permeability, poor comprehensive performance, etc., and achieve high Q value, high magnetic The effect of conductivity

Active Publication Date: 2016-05-25
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, most of the domestically produced NiZn soft ferrite materials have poor overall performance and low high-frequency magnetic permeability (when f>15MHz, μ i ≤120), and the Q value is low (Q≤50), it is difficult to obtain materials with high frequency high magnetic permeability and high Q value characteristics at the same time

Method used

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  • A nickel-zinc ferrite material with high frequency, high magnetic permeability and high q value and its preparation method
  • A nickel-zinc ferrite material with high frequency, high magnetic permeability and high q value and its preparation method

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preparation example Construction

[0028] When the frequency f>20MHz of the nickel-zinc ferrite material, the magnetic permeability μ i >150, Q value >100. The preparation method of the high-frequency high-permeability high-Q nickel-zinc ferrite material of the present invention comprises the following steps:

[0029] a) Weigh raw materials: the main components are proportioned according to the following molar percentages: NiO: 17-19 mol%, ZnO: 31-33 mol%, and the rest is Fe 2 o 3 Weigh raw material Fe 2 o 3 , NiO and ZnO, and by SnO 2 : 0.2~0.4wt% (by weight percentage accounting for the total weight of the whole material) to take the doping component;

[0030] b) One-time pre-calcination: ball mill and mix the above-mentioned raw materials in deionized water for 2-4 hours, after drying, heat to 840-860 °C at a heating rate of 2-5°C / min for one-time pre-burning, and keep warm for 3-4 hours cool down;

[0031] c) Second pre-burning: press Dy 2 o 3 0.002~0.004wt% (according to the weight percentage of t...

Embodiment 1

[0036] The high-frequency, high-permeability, high-Q nickel-zinc ferrite material of Example 1 includes a main component and a doping component, and both the main component and the doping component are calculated as oxide raw materials, wherein the composition of the main component Composition by molar percentage is Fe 2 o 3 49.6mol%, NiO18mol%, ZnO32.4mol%; the composition of the doping component is SnO by weight percentage of the total mass of the material 2 0.35wt%, Dy 2 o 3 0.0028 wt%.

[0037] The preparation method of the high-frequency high-permeability high-Q nickel-zinc ferrite material of embodiment 1 comprises the steps:

[0038] a) Weigh raw materials: according to the proportion of main components Fe 2 o 3 : 49.6mol%, NiO: 18mol%, ZnO: 32.4mol% (by mole percentage) Weigh the raw material Fe 2 o 3 , NiO and ZnO, and by SnO 2 : 0.35wt% (according to the percentage by weight of the total weight of the whole material) to take the doping composition SnO 2 ; ...

Embodiment 2

[0045] The high-frequency, high-permeability, high-Q nickel-zinc ferrite material of Example 2 includes a main component and a doping component, and both the main component and the doping component are calculated as oxide raw materials, wherein the composition of the main component is Composition by molar percentage is Fe 2 o 3 49.4mol%, NiO18.5mol%, ZnO32.1mol%; the composition of the doping component is SnO by weight percentage of the total mass of the material 2 0.29wt%, Dy 2 o 3 0.0034 wt%.

[0046] The preparation method of the high-frequency high-permeability high-Q nickel-zinc ferrite material of embodiment 2 comprises the following steps:

[0047] a) Weigh raw materials: according to the proportion of main components Fe 2 o 3 : 49.4mol%, NiO: 18.5mol%, ZnO: 32.1mol% (by mole percentage) Weigh the raw material Fe 2 o 3 , NiO and ZnO, and by SnO 2 : 0.29wt% (according to the percentage by weight of the total weight of the whole material) to take the doping compo...

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Abstract

The invention belongs to the technical field of soft-magnetic ferrites and particularly relates to a nickel, zinc and ferrite material with high frequency, high permeability and high Q value and a preparation method thereof. The nickel, zinc and ferrite material comprises a principal component and a dopant component both calculated according to the oxide raw material, wherein the principal component comprises the following components according to mole percentage: 17-19 mol% of NiO, 31-33 mol% of ZnO and the balance of Fe2O3; the dopant component comprises the following components according to the weight percentage in the total material weight: 0.2-0.4 wt% of SnO and 0.002-0.004wt% of Dy2O3. The preparation method of the nickel, zinc and ferrite material comprises raw material weighing, primary pre-sintering, secondary pre-sintering, pelleting and molding, and sintering. With adoption of twice pre-sintering, decomposition and volatilization of ZnO can be avoided, stable material composition can be guaranteed, and the situation that the doping elements can better regulate and control the microstructure of the material can be ensured so as to obtain the nickel, zinc and ferrite material with high frequency, high permeability and high Q value, and the nickel, zinc and ferrite material is particularly suitable for serving as a switching power supply direct-current output filter inductor.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic ferrite, and in particular relates to a nickel-zinc ferrite material with high frequency, high magnetic permeability and high Q value and a preparation method thereof. Background technique [0002] As an important functional material, soft ferrite materials are widely used in various fields of the national economy such as electronics, computers, communications, transportation and aerospace. With the development of electronic devices such as various switching power converters, filters, and AC-DC converters towards high frequency, miniaturization, integration, and light weight, the soft magnetic ferrite materials used are required to have high frequency and high magnetic permeability. High Q value characteristics. [0003] At present, most of the domestically produced NiZn soft ferrite materials have poor overall performance and low high-frequency magnetic permeability (when f>15MHz, μ i ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/40C04B35/622
Inventor 郭世海张羊焕祁焱王煜安静赵栋梁
Owner CENT IRON & STEEL RES INST