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NiZn ferrite magnetic sheet, and preparation method and application thereof

A ferrite magnet and green sheet technology, applied in the field of magnetic materials, can solve the problems of low magnetic permeability and affecting the application value of NiZn ferrite

Active Publication Date: 2018-11-09
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above solutions all have the problem of low magnetic permeability, which affects the application value of NiZn ferrite.

Method used

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  • NiZn ferrite magnetic sheet, and preparation method and application thereof
  • NiZn ferrite magnetic sheet, and preparation method and application thereof
  • NiZn ferrite magnetic sheet, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The present embodiment prepares NiZn ferrite magnetic sheet according to the following method:

[0074] (1) the main component Fe of formula quantity 2 o 3 , NiO, ZnO and CuO were placed in a ball mill, added deionized water, mixed and crushed by ball milling, the ball milling time was 30 minutes, and then circulated and mixed for 40 minutes, and then sprayed and granulated to obtain a mixed material. The main components include Fe 2 o 3 , NiO, ZnO and CuO;

[0075] (2) Carry out pre-burning to the mixed material described in step (1) at 700°C, and the pre-burning time is 12h to obtain the calcined powder;

[0076] (3) Mix and crush the calcined powder, binder polyvinyl alcohol, dispersant ethanol and auxiliary components described in step (2) by sand milling for 1 hour to obtain a slurry;

[0077] (4) Cast the slurry described in step (3) to obtain a green sheet with a thickness of 0.03mm, and heat the green sheet from 20°C to a sintering temperature of 900°C at a...

Embodiment 2

[0085] The present embodiment prepares NiZn ferrite magnetic sheet according to the following method:

[0086] (1) the main component Fe of formula quantity 2 o 3 , NiO, ZnO and CuO are placed in a ball mill, added deionized water, mixed and crushed by ball milling, the ball milling time is 100min, and then circulated and mixed for 200min, and then spray granulated to obtain a mixed material, the main component includes Fe 2 o 3 , NiO, ZnO and CuO;

[0087] (2) pre-burn the mixed material described in step (1) at 1000°C, and the pre-fire time is 1h to obtain the pre-fired powder;

[0088] (3) Mix and crush the calcined powder, binder polyvinyl alcohol, dispersant ethanol and auxiliary components described in step (2) by sand milling for 12 hours to obtain a slurry;

[0089] (4) Cast the slurry described in step (3) to obtain a green sheet with a thickness of 0.3mm, and heat the green sheet from 30°C to a sintering temperature of 1200°C at a heating rate of 2°C / min, and ke...

Embodiment 3

[0097] The present embodiment prepares NiZn ferrite magnetic sheet according to the following method:

[0098] (1) the main component Fe of formula quantity 2 o 3 , NiO, ZnO and CuO were placed in a ball mill, added deionized water, mixed and crushed by ball milling, the ball milling time was 60 minutes, and then circulated and mixed for 120 minutes, and then spray granulated to obtain a mixed material. The main components include Fe 2 o 3 , NiO, ZnO and CuO;

[0099] (2) Pre-calcining the mixed material described in step (1) at 850° C. for 6 hours to obtain a pre-calcined powder;

[0100] (3) Mix and crush the calcined powder, binder polyvinyl alcohol, dispersant ethanol and auxiliary components described in step (2) by sand milling for 6 hours to obtain a slurry;

[0101] (4) Cast the slurry described in step (3) to obtain a green sheet with a thickness of 0.15mm. The green sheet is heated from 25°C to a sintering temperature of 1000°C at a heating rate of 1°C / min, and ...

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Abstract

The invention provides a NiZn ferrite magnetic sheet, and a preparation method and application thereof. The NiZn ferrite magnetic sheet comprises main components and auxiliary components. The main components are composed of Fe2O3, NiO, ZnO and CuO; and based on the total molar weight (100%) of the main components, the molar percentages of Fe2O3, NiO, ZnO and CuO are 35 to 45 mol%, 10 to 20 mol%, 20 to 30 mol% and 5 to 35 mol%, respectively. The preparation method provided by the invention comprises the following steps: (1) bathcing; (2) pre-burning; (3) pulping; and (4) tape casting and sintering. The NiZn ferrite magnetic sheet provided by the invention has the advantages of high initial magnetic permeability [mu]i, high saturation magnetic induction intensity Bs, high Curie temperature Tc, etc., can be better applied to the field of wireless charging, and allows wireless charging efficiency to be higher.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and in particular relates to a NiZn ferrite magnetic sheet and its preparation method and application. Background technique [0002] Wireless charging technology (wireless charging technology) is a power transmission technology without wiring, also known as non-contact inductive charging. devices) are not connected by wires. Because the charging device is easy to carry and use, it first shows a broad application prospect in mobile smart devices. Wireless charging technology is realized by means of electromagnetic induction, magnetic resonance, and radio waves. [0003] At present, the electromagnetic induction technology with fast market growth and the promising magnetic resonance technology have a huge demand for magnetic materials, and the magnetic materials involved include soft magnetic materials and permanent magnets. Soft magnetic ferrite material has high initial permeability...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C04B41/83
CPCC04B35/265C04B35/622C04B41/009C04B41/4826C04B41/83C04B2235/3232C04B2235/3244C04B2235/3256C04B2235/3258C04B2235/3275C04B2235/3279C04B2235/3281C04B2235/3284C04B2235/3298C04B2235/3418C04B2235/6025C04B2235/656C04B2235/6565C04B2235/6567
Inventor 陈军林
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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