NiCuZn ferrite magnetic sheet for NFC and wireless charging

A ferrite magnetic and wireless charging technology, applied in the field of NiCuZn ferrite magnetic sheet preparation, can solve the problems of small coil mutual inductance, low conversion efficiency, poor electromagnetic radiation, etc., and achieve high cut-off frequency and high magnetic permeability rate, the effect of high saturation magnetic induction

Inactive Publication Date: 2019-03-19
GUIZHOU ZHENHUA HONGYUN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the transmitting coil and the receiving coil are separated, there will be leakage inductance when the system is working, the mutual inductance of the coils will become smaller, and the conversion efficiency will be lower; and there are many problems such as poor electromagnetic radiation.

Method used

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  • NiCuZn ferrite magnetic sheet for NFC and wireless charging
  • NiCuZn ferrite magnetic sheet for NFC and wireless charging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) 48mol% Fe 2 o 3 , 12mol% CuO, 15mol% NiO, 24mol% ZnO mixed, with steel balls as the medium, ball milled for 1 hour to obtain a ball mill;

[0032] 2) drying the primary ball mill, and then pre-calcining at 900°C for 2 hours to obtain pre-fired material;

[0033] 3) adding the dopant to the calcined material, using zirconium balls as the medium, and ball milling until the particle size reaches 1.2 μm to obtain the dopant; ensure that the dopant contains 0.1wt% Bi 2 o 3 , 0.1wt%Co 2 o 3 , 0.05wt% SnO 2 ;

[0034] 4) Dry and pulverize the dopant, and then add polyvinyl butyral, toluene, absolute ethanol, polyethylene glycol, Citric acid and ethylene glycol were ball milled with zirconium balls for 8 hours to obtain three ball milled slurries;

[0035] 5) The three-time ball-milled slurry is prepared into a membrane with a thickness of 30 μm by casting process, and then dried at 70° C.;

[0036] 6) Laminate 4 layers of the dried membrane, and then use isostatic ...

Embodiment 2

[0040] Each step is with embodiment 1, wherein:

[0041] In step 1), 49mol% Fe 2 o 3 , 8mol% CuO, 18mol% NiO, 26mol% ZnO mixed, ball milled for 4 hours;

[0042] The pre-burning temperature in step 2) is 850° C., and the pre-burning time is 3 hours;

[0043] The particle size in step 3) is 0.8 μm, containing 1wt% Bi in the doping material 2 o 3 , 0.01wt% Co 2 o 3 , 0.3wt% SnO 2 ;

[0044] The ball milling time in step 4) is 4 hours;

[0045] The membrane thickness in step 5) is 60 μm, and the drying temperature is 50° C.;

[0046] The number of laminated layers in step 6) is 6 layers, the thickness of the film blank is 100 μm, the pressure is 80 MPa, the temperature is 50 ° C, and the time is 30 minutes;

[0047] In step 8), the sintering temperature is 900° C., and the holding time is 5 hours.

Embodiment 3

[0049] Each step is with embodiment 1, wherein:

[0050] A ball milling time in step 1) is 2.5 hours;

[0051] The pre-burning temperature in step 2) is 880°C, and the pre-burning time is 2.5 hours;

[0052] The particle size in step 3) is 1 μm, containing 0.35wt% Bi in the dopant 2 o 3 , 0.08wt% Co 2 o 3 , 0.12wt% SnO 2 ;

[0053] The ball milling time in step 4) was 6 hours;

[0054] The membrane thickness in step 5) is 45 μm;

[0055] The lamination in step 6) is 5 layers, the thickness of the film blank is 200 μm, the molding pressure is 65Mpa, the temperature is 60°C, and the time is 22 minutes;

[0056] The sintering temperature in step 8) is 950° C., and the holding time is 3.5 hours.

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Abstract

The invention discloses a NiCuZn ferrite magnetic sheet for NFC and wireless charging, and belongs to a method for manufacturing an electronic material. The method comprises the following steps of: carrying ball milling on 48-49 mol% of Fe2O3, 8-12 mol% of CuO, 15-18 mol% of NiO, the balance ZnO, doping 0.1-1wt% of Bi2O3, 0.01-0.1wt% of Co2O3, and 0.05-0.3% of SnO2, pre-sintering, carrying out curtain coating lamination and hydrostatic molding, discharging rubber, sintering, and the like to prepare the NiCuZn ferrite magnetic sheet. The ferrite magnetic sheet provided by the invention has highsaturation magnetic induction intensity, high residual magnetic induction intensity, high remanence ratio, low coercivity, low dielectric loss and low ferromagnetic resonance linewidth and can completely meet the applications of NFC and wireless charging.

Description

technical field [0001] The invention relates to a preparation method of a ferrite magnetic sheet, in particular to a preparation method of a NiCuZn ferrite magnetic sheet used for NFC and wireless charging. Background technique [0002] With the popularization of electronic mobile terminals, wireless charging technology and NFC (Near Field Communication) technology have been developed rapidly. The main application frequency band of wireless charging technology is about 10MHz, and NFC technology is a short-distance wireless communication technology applied to 13.56MHz. Due to the difference in operating frequency between the two, if the mobile device needs to have the above two functions, different modules must be used to complete wireless charging and NFC communication respectively. However, since the transmitting coil and the receiving coil are separated, there will be leakage inductance when the system is working, the mutual inductance of the coils will become smaller, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
CPCC04B35/265C04B35/622C04B2235/3272C04B2235/3275C04B2235/3279C04B2235/3281C04B2235/3284C04B2235/3293C04B2235/3298C04B2235/5436C04B2235/5445C04B2235/602C04B2235/656C04B2235/6567
Inventor 燕周民张元松张静王安玖戴昭波陈键
Owner GUIZHOU ZHENHUA HONGYUN ELECTRONICS
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