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A kind of nickel-zinc soft magnetic ferrite for wireless charging and its preparation method and application

A soft ferrite, wireless charging technology, applied in the direction of magnetic objects, inorganic material magnetism, circuits, etc., can solve the problems of no further elaboration of magnetic properties, low loss, low material properties, etc., to eliminate abnormally fast response, excellent Comprehensive magnetic properties, smooth appearance

Active Publication Date: 2021-04-06
SHANGHAI AMPHENOL AIRWAVE COMM ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] CN102976726A discloses a method for microwave sintering of ultra-thin ferrite sheets, the purpose of which is to solve the problems of easy deformation, poor flatness and even fracture of ferrite magnetic sheets in the prior art during firing
This reference document manufactures its high-quality magnetic sheet through a high-productivity process. Although the magnetic sheet manufactured by this method solves the deformation problem of the magnetic sheet, because the material is not sintered, there is a large amount of binder barrier between the magnetic materials, and the material performance very low
[0015] CN201610176849 discloses a NiZnCu ferrite material and a preparation method thereof. The method mainly obtains high magnetic permeability and low loss from the optimization of the main phase formula of the material, and can be applied to the formula of a magnetic isolation sheet for wireless charging, but the material formula has to be made There is no further elaboration on the magnetic performance of the magnetic sheet, and there is no description of the process involved in the sintering process of the magnetic sheet and the reduction of the deformation of the magnetic sheet

Method used

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  • A kind of nickel-zinc soft magnetic ferrite for wireless charging and its preparation method and application

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preparation example Construction

[0039] A kind of preparation method of nickel-zinc soft magnetic ferrite for wireless charging of the present invention specifically comprises the following steps:

[0040] (1) Weigh the raw materials in the above-mentioned main components and doping components, and mix them evenly with a ball mill / sand mill. The grinding medium used is iron balls or zirconia balls. After the first ball milling, the laser particle size of the mixed raw materials is D50≤1μm. The powder is dried, sieved, and pre-fired. The pre-fired temperature is 850-900°C, the pre-fired time is 2-5 hours, and the air atmosphere is pre-fired; after pre-burning, the powder is ball milled / sand milled twice, and the grinding medium used is also iron. Balls or zirconia balls, after the second ball milling, the laser particle size of the mixed raw materials is D50≤2μm, after the second ball milling / sand milling, the powder is dried and sieved to obtain the required ferrite powder;

[0041] (2) Based on the weight of...

Embodiment 1

[0045] The ferrite thin magnetic sheet used for wireless charging of electronic products in this embodiment 1, the nickel-zinc soft ferrite used in it is made from the following raw materials: main component: Fe 2 o 3 65.3kg, NiO 5.6kg, ZnO 22.5kg and CuO 6.6kg, doping composition: Dy 2 o 3 It is 0.1kg; Its preparation method comprises the following steps:

[0046] (1) Weigh the above-mentioned metal oxide raw materials according to the above-mentioned proportions, mix them with a wet ball mill at a speed of 400r / min for 4 hours, dry them, and pre-fire them in an air atmosphere at a temperature of 910°C / 4h; The powder was subjected to wet secondary ball milling again, ball milled at a speed of 600r / min for 6h, and dried to obtain ferrite powder;

[0047] (3) To prepare casting slurry, the solvent used is a mixture of methyl ethyl ketone and toluene system with a mass ratio of 1:1, and the addition amount is 44wt% by weight of ferrite powder; the binder is polyvinyl butyral ...

Embodiment 2

[0051] The ferrite thin magnetic sheet used for wireless charging of electronic products in this embodiment 2, the nickel-zinc soft ferrite used in it is made from the following raw materials: main component: Fe 2 o 3 65.3kg, NiO 5.6kg, ZnO 22.5kg and CuO 6.6kg, doping composition: Dy 2 o 3 0.05kg, Y 2 o 3 0.05kg and Tb 2 o 3 0.05kg;

[0052] Its preparation process is identical with embodiment 1.

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Abstract

The invention belongs to the field of soft ferrite, and discloses a nickel-zinc soft ferrite for wireless charging and its preparation method and application. The ferrite includes a main component and a doping component, and the main component includes Fe 2 o 3 , NiO, ZnO and CuO, doping components include at least Nd 2 o 3 、Pr 6 o 11 、Gd 2 o 3 、Dy 2 o 3 , Tb 2 o 3 、Ho 2 o 3 and Sm 2 o 3 One of them; where, based on the weight of the main component, Fe in the main component 2 o 3 The content of CuO is 64-67wt%, the content of NiO is 4-10wt%, the content of ZnO is 18-24wt%, and the content of CuO is 3-9wt%. Based on the weight of the main component, the content of each doping component 0.02-0.2wt%, and the total addition amount is ≤0.5wt%. The invention optimizes the doping composition of nickel-zinc ferrite, so that the ferrite magnetic sheet thin product is sintered densely when T=0.05-0.2mm, the sintering temperature wide temperature increases, and the sintering temperature rises and shrinks The speed is smooth and the appearance is flat. At the same time, it can effectively reduce the power loss (power consumption) per unit volume of the magnetic sheet, reduce the working temperature rise of the wireless charging device, and improve the transmission efficiency.

Description

technical field [0001] The invention belongs to the technical field of soft ferrite materials, and relates to a nickel-zinc soft ferrite, in particular to a nickel-zinc soft ferrite for wireless charging and a preparation method and application thereof. Background technique [0002] For 3C products such as mobile phones and tablet computers, there are two common charging methods for batteries, contact charging and non-contact charging. In the contact charging method, charging is performed by directly contacting the electrodes of the power receiving device with the electrodes of the power supply device. [0003] As far as the contact charging method is concerned, it is usually used in a wide range of applications due to its simple device structure. The consumption of battery energy has also doubled. However, the energy density of lithium-ion batteries used in 3C products such as mobile phones and tablet computers has a very limited increase. According to data, in the past 10...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622H01F1/34
CPCC04B35/2608C04B35/265C04B35/622C04B35/632C04B35/634C04B2235/3224C04B2235/3225C04B2235/3251C04B2235/3279C04B2235/3281C04B2235/3284C04B2235/5436C04B2235/6025H01F1/344
Inventor 张素荣
Owner SHANGHAI AMPHENOL AIRWAVE COMM ELECTRONICS CO LTD
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