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Soft magnetic material and preparation method thereof

A soft magnetic material and powder technology, applied in the field of communication, can solve the problems of small magnetic loss, large magnetic loss and high magnetic permeability.

Inactive Publication Date: 2014-01-15
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the existing soft magnetic materials have large magnetic permeability and large magnetic loss, the present invention provides a soft magnetic material with large magnetic permeability and small magnetic loss and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The present invention also provides a method for preparing the soft magnetic material of the present invention, the method comprising the following steps:

[0020] S1 Mix the main components, auxiliary components and sintering aids, then add solvent and dispersant for wet grinding;

[0021] S2 Put the powder obtained by grinding in step S1 into a container, and put it into an oven for drying;

[0022] S3 Powder pre-burning: crush the dried powder and put it into a sintering container for pre-burning;

[0023] S4 Grinding the pre-burned powder and sieving;

[0024] S5 molding: molding the powder obtained in step S4;

[0025] S6 Sintering: Sintering the molded product to obtain the soft magnetic material of the present invention.

[0026] According to the preparation method provided by the present invention, preferably, the speed of the wet grinding in step S1 is 300-450r / min, and the time is 3-12h.

[0027] According to the preparation method provided by the present ...

Embodiment 1

[0035] 1. Mix the main components, auxiliary components and sintering aids according to the raw material content shown in Table 1 (all are molar content), then add solvent and dispersant, and carry out wet grinding: 400r / min, 6h;

[0036] 2. Put the powder obtained by grinding in step 1 into a container, and put it in an oven for drying: 80°C, 6h;

[0037]3. Powder pre-burning: crush the dried powder, put it into a sintering container for pre-burning: 5°C / min, heat up to 900°C, keep it warm for 2 hours, and cool with the furnace;

[0038] 4. Grind the pre-fired powder and sieve: 400r / min, 6h;

[0039] 5. Forming: Molded into a ring shape, the outer diameter of the ring is 20mm, the inner diameter is 5mm, and the height is 8mm;

[0040] 6. Sintering: Sinter the molded product to obtain the soft magnetic material A1 of the present invention: the heating rate is 2°C / min; 300°C for 30min; 550°C for 30min; 900°C for 60min; the highest temperature is 1100°C, keep warm for 120min; ...

Embodiment 2

[0042] The soft magnetic material A2 was prepared according to the method of Example 1, with the difference that the content of each raw material is shown in Table 1.

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Abstract

The invention provides a soft magnetic material which is large in magnetic conductivity and low in magnetic loss and a preparation method thereof. The soft magnetic material comprises main components, auxiliary components and a sintering aid, wherein the main components relate to Fe2O3, NiO, ZnO and CuO, and the auxiliary components relate to Gd2O3 and B2O3; with the total molar weight of the soft magnetic material as the basic standard, the content of the Fe2O3 is 46-53mol%, the content of the NiO is 11-19mol%, the content of the ZnO is 22-27mol%, the content of the CuO is 6-11mol%, the content of the Gd2O3 is 0.1-1mol%, the content of the B2O3 is 0.1-2mol%, and the content of the sintering aid is 0.4-2mol%. According to the soft magnetic material and the preparation method thereof, the magnetic performance of products is improved, the products can have higher magnetic conductivity and low magnetic loss under the 13.56MHz condition, and then the communication distance of an NFC system of a mobile phone is improved; the Gd2O3 can increase the lattice constant, prevent domain wall movement, reduce superexchange interaction between ions on the A phase of a tetrahedron and ions on the B phase of an octahedron, improve cut-off frequency and reduce the magnetic loss, the B2O3 can form liquid-phase sintering, promote grain growth, make tissue compacter, and reduce internal and external air hole rates of a grain, and coercivity can be reduced and initial magnetic conductivity can be improved if a proper amount of B2O3 is added.

Description

technical field [0001] The invention belongs to the field of communication, and in particular relates to a soft magnetic material for an antenna and a preparation method thereof. Background technique [0002] The function of the thin magnetic sheet in the NFC (Near Field Communication Technology) antenna module is to reduce the eddy current effect so that NFC can respond normally. Therefore, the higher the value of its magnetic permeability, the better the conduction effect; but generally speaking, the higher the magnetic permeability of the soft magnetic material, the higher the magnetic loss, which is not good for the magnetic performance. In the prior art, sendust materials have relatively low resistivity, resulting in high magnetic loss, which is not conducive to being used as a magnetic conduction material in an NFC antenna module. In addition, magnetic sheets with stronger magnetic conductance are more conducive to miniaturization, so soft magnetic materials with larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/36C04B35/40C04B35/622
Inventor 王绍隆向其军
Owner BYD CO LTD
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