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MnZn ferrite material with high frequency and high impedance and preparation method thereof

A ferrite material and high impedance technology, applied in the field of MnZn ferrite material and its preparation, can solve the problems of low practical value, high impedance and low frequency

Inactive Publication Date: 2014-10-01
ZHEJIANG CHUNHUI COMPOSITE MATERIAL
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Problems solved by technology

[0003] The magnetic parameters of soft ferrite are not only related to the constituent elements, structure and shape, but also related to the preparation conditions and methods. The preparation of soft ferrite materials generally adopts precipitation method, direct oxide sintering method, direct ball milling method and sintering method, etc. , the existing soft magnetic ferrite materials with high frequency and high impedance are all nickel-zinc ferrite materials. About 10,000 yuan / ton, high practical value, but the existing MnZn ferrite materials generally only have the characteristics of high impedance and low frequency, or the characteristics of high magnetic permeability and wide frequency, or high initial magnetic permeability and low power consumption characteristics, or the characteristics of high saturation magnetic induction and high resistivity, so it is necessary to invent a high-frequency high-impedance MnZn ferrite material and its preparation method

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  • MnZn ferrite material with high frequency and high impedance and preparation method thereof

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preparation example Construction

[0023] The preparation method of high resistance MnZn ferrite material of the present invention comprises the following steps:

[0024] 1) The formula adopts 46.0-54.0mol% Fe 2 o 3 , 25.0-27.0mol% MnO and 19.0-21.0mol% ZnO;

[0025] 2) Mix the above-mentioned powders evenly, and perform ball milling for the first time;

[0026] 3) The powder obtained in step 2) is sprayed and granulated for the first time;

[0027] 4) Pre-burn the powder obtained in step 3) at 800°C-1000°C for 1-1.5 hours;

[0028] 5) Add auxiliary component 0.03wt%-0.08wt% TiO to the powder obtained in step 4) 3 , 0.03wt%-0.08wt% CaCO 3 , 0.03wt%-0.08wt% V 2 o 5 At least one of them, then add 60wt%-120wt% deionized water based on the total weight of the main components, 0.5wt%-3wt% dispersant, 0.5wt%-3wt% defoamer together for the second time Ball milling, so that the particle size of the powder after ball milling reaches 0.8-1 micron;

[0029] 6) Based on the total weight of the powder obtained in s...

specific Embodiment 1-9

[0032] Specific embodiment 1-9 way: adopt commercially available Fe 2 o 3 , MnO, ZnO as the main component, 48.6mol% Fe 2 o 3 , 31.4mol% MnO, 20.0mol% ZnO are placed in a sand mill and stirred, mixed evenly, then taken out and dried in a drying oven; after drying, pre-burn at 800-900°C for 1.5h in a box-type resistance furnace . Then put the pre-fired powder into the ball mill, and add the auxiliary component 0.03wt% TiO 3 , 0.04 wt% CaCO 3 , and then add 60wt% deionized water, 2wt% dispersant, and 2wt% defoamer based on the total weight of the main components for ball milling; ball mill the powder until the average particle size is about 1.0±0.2mm, and dry Then add 8wt% polyvinyl alcohol aqueous solution based on the total weight of the powder to granulate, sinter at a sintering temperature of 1300°C-1400°C in a seed pressure hood furnace, and keep warm at the sintering temperature for 2-5 hours, Then it is cooled to 180°C and released from the furnace, wherein the oxyg...

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Abstract

The invention discloses a MnZn ferrite material with high frequency and high impedance. The MnZn ferrite material is composed of main components and auxiliary components. The MnZn ferrite material is characterized in that counted by oxides according to molar percentage, the main components comprise 46.0-54.0mol% of Fe2O3, 25.0-27.0mol% of MnO and 19.0-21.0mol% of ZnO; counted by oxides according to percentage by weight, based on the total weight of the main components, the auxiliary components comprise at least one of 0.03-0.08wt% of TiO3, 0.03-0.08wt% of CaCO3 and 0.03-0.08wt% of V2O5. At 100MHz, the MnZn ferrite material has direct current resistivity greater than 200.Omega m, a Curie temperature of 25 DEG C and initial magnetic conductivity greater than or equal to 7000.

Description

technical field [0001] The invention relates to a MnZn ferrite material and a preparation method thereof, in particular to a MnZn ferrite material with high frequency and high impedance and a preparation method thereof. Background technique [0002] In the era of electronic information, with the rapid development of satellite communications, mobile communications, computer applications, etc., electromagnetic interference (EMI) has more and more serious impact on military and civilian electronic information fields, and has caused great harm to the public environment, personal safety and information confidentiality. great harm. An effective way to solve or reduce electromagnetic pollution and improve the anti-electromagnetic interference ability of electronic equipment is to adopt electromagnetic compatibility design, which requires a large number of anti-EMI materials, and due to the miniaturization, flattening, and high-frequency development of electronic equipment, soft mag...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 陈志华徐仲达徐荣许锡坤倪贝鲁
Owner ZHEJIANG CHUNHUI COMPOSITE MATERIAL
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