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NiZn (nickel zinc) ferrite material with high magnetic conductivity and high Curie temperature and preparation method thereof

A technology of ferrite material and high magnetic permeability, which is applied in the fields of high resistivity NiZn ferrite material and its preparation, high magnetic permeability, and high Curie temperature, can solve the problems of unfavorable cost and reduction, and achieve improvement Reliability, low leakage inductance coefficient, and the effect of avoiding electronic ignition problems

Active Publication Date: 2012-03-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent (Application No. 200510050619.4) discloses a NiZn ferrite material with wide temperature and high magnetic permeability, which has high magnetic permeability in a wide temperature range, but it is still less than 2000; A NiZn ferrite material with high magnetic permeability, its magnetic permeability is about 2500, and its Curie temperature is greater than 100 °C, but the expensive NiO content in its formula is greater than or equal to 15 mol%, which is not conducive to cost reduction

Method used

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  • NiZn (nickel zinc) ferrite material with high magnetic conductivity and high Curie temperature and preparation method thereof
  • NiZn (nickel zinc) ferrite material with high magnetic conductivity and high Curie temperature and preparation method thereof
  • NiZn (nickel zinc) ferrite material with high magnetic conductivity and high Curie temperature and preparation method thereof

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preparation example Construction

[0057] The main material of the NiZn ferrite material of the present invention is calculated as an oxide by mole percentage, and the dopant component is calculated by weight percentage as an oxide. High magnetic permeability of the present invention, high Curie temperature and high resistivity NiZn ferrite material and preparation method thereof, comprise the following steps:

[0058] 1) Recipe

[0059] Using 48.5~49.9mol% Fe 2 o 3 , 31.0-34.0mol% ZnO, 4.0-8.0mol% CuO, the balance being NiO;

[0060] 2) Ball milling once

[0061] Mix the above powders evenly in a ball mill for 1 to 3 hours;

[0062] 3) pre-burning

[0063] Dry the ball mill material obtained in step 2, and pre-fire it in a furnace at 800-1000°C for 1-3 hours;

[0064] 4) Doping

[0065] Add the following dopant to the powder obtained in step 3 by weight ratio: 0.001-0.30wt% MoO 3 , 0.001~0.20wt%V 2 o 5 , 0.01~0.40wt% Bi 2 o 3 , 0.001~0.05wt%Nb 2 o 5 , 0.001~0.08wt% nano-TiO 2 ;

[0066] 5) Seco...

Embodiment 1～8

[0079] Embodiments 1-8: A NiZn ferrite material with high magnetic permeability, high Curie temperature and high resistivity and its preparation method, comprising the following steps:

Embodiment 1～4

[0081] 1. Formula

[0082] Embodiment 1~4 master formula sees the following table:

[0083]

[0084] 2. One ball milling

[0085] Mix the above powders evenly in a ball mill for 2 hours;

[0086] 3. Pre-burning

[0087] Dry the ball mill material obtained in step 2, and pre-fire it in a furnace at 950°C for 2 hours;

[0088] 4. Doping

[0089] Add the following dopant by weight ratio to the powder obtained in step 3: 0.12wt% MoO 3 , 0.08wt%V 2 o 5 , 0.02wt% Bi 2 o 3 , 0.003wt% Nb 2 o 5 , 0.002wt% nano-TiO 2 ;

[0090] 5. Secondary ball milling

[0091] The powder obtained in step 4 was ball milled in a ball mill for 6 hours;

[0092] 6. Forming

[0093] Add 10wt% organic binder to the powder obtained in step 5 by weight, mix evenly, and after granulation, press the granular powder into a blank on a press;

[0094] 7. Sintering

[0095] The blank obtained in step 6 was placed in a sintering furnace for sintering, and kept at 1080° C. for 3 hours.

[0096] T...

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Abstract

The invention discloses a NiZn (nickel zinc) ferrite material with a high magnetic conductivity and a high Curie temperature, which belongs to the technical field of the preparation of ferrite materials. Components of the NiZn ferrite material with the high magnetic conductivity and the high Curie temperature comprise main materials and doping agents. The NiZn ferrite material with the high magnetic conductivity and the high Curie temperature is characterized in that: based on oxides, the main materials comprise: 48.5-49.9 mol% of Fe2O3, 31.0-34.0 mol% of ZnO, 4.0-8.0 mol% of CuO and the balance of NiO; and based on the oxides, by using the main materials are datum references, the doping agents in percentage by weight comprise: 0.001-0.30 wt% of MoO3, 0.001-0.20 wt% of V2O5, 0.01-0.40 wt%of Bi2O3, 0.001-0.05 wt% of Nb2O5 and 0.001-0.08 wt% of TiO2. Due to the high magnetic conductivity owned by the NiZn ferrite material with the high magnetic conductivity and the high Curie temperature, a low leakage coefficient can be obtained; the working frequency band of a device is widened beneficially; due to the high Curie temperature, the range of the working temperature of the device canbe widened; the working of the device in different environments is beneficial; due to high electrical resistivity, a wideband device can be prevented from generating an electronic fire striking problem in an MHz (megahertz) frequency range; and the reliability of a system and the device is improved.

Description

technical field [0001] The technology belongs to the technical field of ferrite material preparation, and particularly relates to NiZn ferrite material with high magnetic permeability, high Curie temperature and high resistivity and a preparation method thereof. Background technique [0002] NiZn ferrite material has the advantages of high resistivity, high Curie temperature, low temperature coefficient, good high frequency performance, etc., and is widely used in the fields of radio frequency broadband and high frequency anti-electromagnetic interference. In recent years, with the development of RF ferrite broadband devices, the demand for NiZn ferrite with high magnetic permeability characteristics is increasing day by day. The material has a typical relaxed magnetic spectrum, and the broadband device made with it can realize energy transmission and impedance transformation of radio frequency signals in a wide frequency range. An important development direction of RF broa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 余忠孙科蒋晓娜兰中文郭荣迪许志勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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