A kind of ferrite sheet and preparation method thereof

A ferrite sheet and ferrite technology, applied in the field of ferrite sheet and its preparation, can solve the problems of low efficiency, cumbersome process, and inability to fully reflect the performance of ferrite materials, and achieve the effect of improving the reading and writing distance

Active Publication Date: 2018-10-30
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the performance of the ferrite material itself cannot be fully reflected. The Chinese patent (publication number: CN 104844186 A) has announced that the cast raw material tapes are laminated, and then the laminated raw material tapes are subjected to isostatic pressing to improve the strength of the raw material tapes. density
However, since the cast raw tape has to go through processes such as lamination, bagging, vacuuming, isostatic pressing, and bag opening, this process is relatively cumbersome and inefficient.

Method used

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  • A kind of ferrite sheet and preparation method thereof
  • A kind of ferrite sheet and preparation method thereof
  • A kind of ferrite sheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A ferrite sheet comprising 100 parts by weight of NiCuZn ferrite powder:

[0038] 2 parts of binder; 1 part of plasticizer; 20 parts of solvent.

[0039] The average particle size of the NiCuZn ferrite powder in this embodiment is 0.60 μm.

[0040] In this embodiment, the binder is polyvinyl butyral.

[0041] In this embodiment, the plasticizer is dimethyl phthalate.

[0042] In this embodiment, the solvent is acetone.

[0043] The preparation method of above-mentioned ferrite sheet, comprises the following steps:

[0044] 1) Mix 100 parts of NiCuZn ferrite powder and 20 parts of solvent by ball milling for 1 hour;

[0045] 2) Add 2 parts of binder, ball mill and mix for 6 hours;

[0046] 3) Add 1 part of plasticizer, ball mill and mix for 1 hour;

[0047] 4) Take the uniformly mixed slurry in step 3), put it on a tape casting machine to prepare a green sheet;

[0048] 5) Pressing the green sheet, the thickness of the green sheet is 8%, and the stretch of the gre...

Embodiment 7

[0056] A ferrite sheet comprises 10 parts of binder based on 100 parts by weight of NiCuZn ferrite powder; 5 parts of plasticizer; and 100 parts of solvent.

[0057] The average particle size of the NiCuZn ferrite powder in this embodiment is 1.2um.

[0058] The binder in this embodiment is polyacrylate.

[0059] The plasticizer in this embodiment is polyethylene glycol.

[0060] The plasticizer solvent is ethanol.

[0061] The preparation method of above-mentioned ferrite sheet, comprises the following steps:

[0062] 1) 100 parts of NiCuZn ferrite powder and 100 parts of solvent, mixed by ball milling for 6 hours;

[0063] 2) Add 10 parts of binder, ball mill and mix for 15 hours;

[0064] 3) Add 5 parts of plasticizer, ball mill and mix for 10 hours;

[0065] 4) Take the uniformly mixed slurry in step 3), put it on a tape casting machine to prepare a green sheet;

[0066] 5) Pressing the green sheet, the thickness of the green sheet is compressed by 20%, and the stret...

Embodiment 2～6、8～10 and comparative Embodiment 1～7

[0072] Embodiments 2~6,8~10 differ from Embodiment 1 or 7 in that:

[0073] Formula composition in the embodiment 1~10 of table 1

[0074]

[0075]

[0076] The preparation technology of table 2 embodiment 1-6 and comparative example 1-4

[0077]

[0078] The preparation technology of table 3 embodiment 7-10 and comparative example 5-7

[0079]

[0080]

[0081] Table 4 Comparison of sintering process, magnetic properties, sheet density and appearance of magnetic sheets

[0082]

[0083]

[0084] Can draw by above-mentioned embodiment and comparative example: by 100 parts by weight of NiCuZn ferrite powder, when binder part is less than 2 parts by weight, the green sheet that casts out becomes brittle, breaks easily; When the amount of the plasticizer is more than 8 parts by weight, the green sheet will have more pores after sintering, resulting in a decrease in the performance of the ferrite sheet; when the plasticizer is less than 1 part by weight, the...

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Abstract

The invention discloses a ferrite sheet. The ferrite sheet comprises the following components in parts by weight (counted by 100 parts of NiCuZn ferrite powder): 2-8 parts of a binding agent, 1-6 parts of a plasticizer and 20-100 parts of a solvent. The invention further discloses a preparation method of the ferrite sheet. According to the ferrite sheet prepared by virtue of the preparation method, under the frequency of 13.56MHz, the complex permeability real part mu' is 140-200, the complex permeability imaginary part mu'' is 1-6, and the thickness is 30-120 microns; the ferrite sheet has certain flexibility; by increasing the magnetic conductivity mu' of the ferrite sheet, the magnetic field intensity reduced due to the decrease of the thickness is compensated, and the capacity of the ferrite sheet for gathering electromagnetic signals is improved, so that the read-write distance of an NFC mobile phone is improved.

Description

technical field [0001] The invention belongs to the field of electronic material manufacturing, and in particular relates to a ferrite sheet and a preparation method thereof. Background technique [0002] In recent years, Near Field Communication (NFC) technology has been widely used in smart phones. However, when the NFC antenna is placed near the mobile phone circuit board or the battery, the metal material will generate eddy current phenomenon under the action of the alternating electromagnetic field, which will greatly weaken the signal strength and cause insensitivity or even failure of card reading. In order to solve the above problems, a ferrite sheet is usually pasted between the NFC antenna and the mobile phone battery. The ferrite sheet can effectively isolate the signal from the metal, reduce or avoid the generation of eddy currents, thereby increasing the communication distance. However, with the development of lightweight and thinner mobile phones, the thicknes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/04B32B7/12B32B37/15B32B37/12C04B35/26
CPCB32B7/12B32B15/04B32B37/12B32B37/156B32B2250/02B32B2307/208C04B35/2608C04B35/632
Inventor 於扬栋单震王媛珍苏艳峰包宇航
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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