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NiCuZn ferrite material and preparation method thereof

A technology of ferrite material and raw material, applied in the field of magnetic isolation sheet NiCuZn ferrite material and its preparation, can solve the problems of poor electromagnetic compatibility, large leakage inductance, low conversion efficiency and the like

Active Publication Date: 2014-09-10
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of wireless charging device still has many disadvantages. Since the transmitting coil and receiving coil are separated, the loose coupling will lead to many problems such as large leakage inductance, small mutual inductance, low conversion efficiency, and poor electromagnetic compatibility.

Method used

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  • NiCuZn ferrite material and preparation method thereof
  • NiCuZn ferrite material and preparation method thereof
  • NiCuZn ferrite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Formulation: Fe 2 o 3 48.5 mol%, ZnO 29 mol%, NiO 16 mol%, CuO 6.5 mol%.

[0025] 2) One-time ball milling: put the weighed raw materials into a ball milling tank, add deionized water, wherein the mass ratio of raw materials and deionized water is 1:1.5 for ball milling, and the time is 2.5 hours.

[0026] 3) Pre-burning: Dry the ball abrasive obtained in the previous step, and pre-fire in a furnace at 900°C for 2.5 hours, and cool naturally in the furnace after pre-burning.

[0027] 4) Secondary ball milling: put the above-mentioned obtained materials into a ball milling tank, add deionized water, wherein the ratio of material to water is 1:1.5, and perform secondary ball milling for 2.5 hours.

[0028] 5) Granulation molding: add 6wt% polyvinyl alcohol to the dried material after secondary ball milling, mix evenly, carry out granulation, and finally press molding.

[0029] 6) Sintering: Put the molded ferrite material into a furnace whose atmosphere is air, set ...

Embodiment 2

[0031] 1) Formulation: Fe 2 o 3 is 48.5mol%, ZnO is 29mol%, NiO is 14.5mol%, CuO is 8mol%, dopant V 2 o 5 0.05wt%.

[0032] 2) Primary ball milling: Put the weighed raw materials into a ball milling tank, add deionized water, wherein the mass ratio of raw materials to deionized water is 1:2, and perform ball milling for 2 hours.

[0033] 3) Pre-burning: Dry the ball abrasive obtained in the previous step, and pre-fire in a furnace at 840°C for 3 hours, and cool naturally in the furnace after pre-burning.

[0034] 4) Doping: Add 0.05wt% V to the powder obtained in step 3) by mass percentage 2 o 5 .

[0035] 5) Secondary ball milling: Put the above-mentioned materials into a ball mill tank, add deionized water, and the mass ratio of material to water is 1:2. Perform secondary ball milling for 4 hours.

[0036] 6) Granulation molding: add 8wt% polyvinyl alcohol to the dried material after secondary ball milling, mix evenly, carry out granulation, and finally press molding...

Embodiment 3

[0039] 1) Formulation: Fe 2 o 3 is 48.5mol%, ZnO is 29mol%, NiO is 14.5mol%, CuO is 8mol%, dopant V 2 o 5 0.1 wt%.

[0040] 2) Primary ball milling: Put the weighed raw materials into a ball milling tank, add deionized water, wherein the mass ratio of raw materials to deionized water is 1:1, and perform ball milling for 3 hours.

[0041] 3) Pre-burning: Dry the ball abrasive obtained in the previous step, and pre-fire in a furnace at 880°C for 2 hours, and cool naturally in the furnace after pre-burning.

[0042] 4) Doping: Add 0.1wt% V to the powder obtained in step 3) by mass percentage 2 o 5 .

[0043] 5) Secondary ball milling: put the above-mentioned obtained materials into a ball milling tank, add deionized water, wherein the mass ratio of material to water is 1:1, and perform secondary ball milling for 3 hours.

[0044] 6) Granulation molding: add 7.5wt% polyvinyl alcohol to the dried material after the secondary ball milling, mix evenly, carry out granulation, and...

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Abstract

The invention relates to a NiCuZn ferrite material under the application background of being taken as a shielding material in wireless charging and a preparation method of the NiCuZn ferrite material. The NiCuZn ferrite material comprises main components and doping components based on oxide, the main components in molar percentage are as follows: 48.5-49.5mol% of Fe2O3, 25-29mol% of ZnO, 11.5-20.5mol% of NiO and 5-9.5mol% of CuO; the percentage by mass of the doping component V2O5 is more than or equal to 0 and less than or equal to 0.12wt%. The preparation method adopts the traditional oxide sintering preparation process and comprises the following steps: (1) mixing raw materials, (2) presintering, (3) doping, (4) carrying out secondary ball milling, (5) pelletizing and moulding, and (6) sintering. The prepared NiCuZn ferrite material has the advantages that initial permeability mu i is 950-1000 in frequency interval of 100-200KHz, power loss Pcv at 100KHz, 100mT and 25 DEG C is 460-500mW / cc, saturation induction density Bs is more than or equal to 360mT, and coercive force Hc is less than 32A / m; requirements of the ferrite material taken as the shielding material during the wireless charging of low power loss Pcv, low Hc, high mu i and high Bs can be met.

Description

technical field [0001] The invention relates to a NiCuZn ferrite material for a magnetic isolation sheet at a receiving coil end of wireless charging and a preparation method thereof, belonging to the field of electronic material preparation. Background technique [0002] With the rapid development of the electronic information industry, electronic products are constantly being introduced, and their functions are becoming more and more powerful. At the same time, the power consumption is also increasing. At present, the charging method for portable electronic products such as mobile phones, digital cameras and tablet computers is mainly wired charging. This charging method has many disadvantages, such as easy damage, inconvenient to carry, inconvenient to charge in time, and risk of electric shock. In addition, almost every electronic product comes with a specific wired charger, and users basically have to discard the original charger every time they replace an electronic d...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 梁迪飞李东月王昕赵青谢建良邓龙江
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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