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MnZn ferrite magnetic sheet and preparation method and application thereof

A ferrite magnet and iron element technology, which is applied in the field of MnZn ferrite magnets and their preparation, can solve the problems of incapability of thin wireless charging of MnZn ferrite magnets and increase the preparation cost, and is beneficial to wireless charging applications. , the effect of high saturation magnetic induction intensity and high Curie temperature

Active Publication Date: 2018-10-26
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above solutions all need to add additive components to the MnZn ferrite material, which increases the preparation cost, and it is impossible to make the MnZn ferrite magnetic sheet very thin to meet the needs of wireless charging.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] This embodiment prepares MnZn ferrite magnetic sheet according to the following method:

[0078] (1) According to Fe 2 o 3 The molar percentage of ZnO is 49.5mol%, the molar percentage of ZnO is 21.2mol%, and the balance is the molar ratio of MnO, which is converted into Fe 2o 3 , Mn 3 o 4 and the quality of ZnO are weighed, and the weighed Fe 2 o 3 , Mn 3 o 4 Put ZnO and ZnO in a sand mill, add water, sand mill for 40 minutes, then stir and mix in a stirring tank for 10 minutes, and then spray granulate to obtain a mixed material;

[0079] (2) Pre-calcining the mixed material described in step (1) at 850° C. for 2 hours to obtain a pre-calcined powder;

[0080] (3) Place the calcined powder described in step (2) in a sand mill, add water, and perform sand milling for 40 minutes, then dry or spray dry to obtain a powder with a water content below 0.1%. dry powder;

[0081] (4) Mix and grind the dry powder, organic solvent, binder and plasticizer described in ...

Embodiment 2

[0086] This embodiment prepares MnZn ferrite magnetic sheet according to the following method:

[0087] (1) According to Fe 2 o 3 The molar percentage of ZnO is 49.8mol%, the molar percentage of ZnO is 23.0mol%, and the balance is the molar ratio of MnO, which is converted into Fe 2 o 3 , Mn 3 o 4 and the quality of ZnO are weighed, and the weighed Fe 2 o 3 , Mn 3 o 4 Put ZnO and ZnO in a sand mill, add water, sand mill for 40 minutes, then stir and mix in a stirring tank for 10 minutes, and then spray granulate to obtain a mixed material;

[0088] (2) Pre-calcining the mixed material described in step (1) at 850° C. for 2 hours to obtain a pre-calcined powder;

[0089] (3) Place the calcined powder described in step (2) in a sand mill, add water, and perform sand milling for 40 minutes, then dry or spray dry to obtain a powder with a water content below 0.1%. dry powder;

[0090] (4) Mix and grind the dry powder, organic solvent, binder and plasticizer described in...

Embodiment 3

[0095] This embodiment prepares MnZn ferrite magnetic sheet according to the following method:

[0096] (1) According to Fe 2 o 3 The molar percentage of ZnO is 48.8mol%, the molar percentage of ZnO is 22.5mol%, and the balance is the molar ratio of MnO, which is converted into Fe 2 o 3 , Mn 3 o 4 and the quality of ZnO are weighed, and the weighed Fe 2 o 3 , Mn 3 o 4 Put ZnO and ZnO in a sand mill, add water, sand mill for 40 minutes, then stir and mix in a stirring tank for 10 minutes, and then spray granulate to obtain a mixed material;

[0097] (2) Pre-calcining the mixed material described in step (1) at 850° C. for 2 hours to obtain a pre-calcined powder;

[0098] (3) Place the calcined powder described in step (2) in a sand mill, add water, and perform sand milling for 40 minutes, then dry or spray dry to obtain a powder with a water content below 0.1%. dry powder;

[0099] (4) Mix and grind the dry powder, organic solvent, binder and plasticizer described in...

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Abstract

The invention provides an MnZn ferrite magnetic sheet and a preparation method and application thereof. The MnZn ferrite magnetic sheet comprises iron element, manganese element and zinc element, wherein the iron element is in the form of Fe2O3, the zinc element is in the form of ZnO, the manganese element is in the form of MnO, the mole percentage of Fe2O3 in the MnZn ferrite magnetic sheet is 48.5 to 50 mol%, the mole percentage of ZnO in the MnZn ferrite magnetic sheet is 15 to 24 mol%, the balance is MnO, and the thickness of the MnZn ferrite magnetic sheet is 0.03 to 0.3 mm. The preparation method comprises the following steps: (1) material preparation; (2) presintering; (3) first grinding; (4) second grinding and pulping; and (5) curtain coating and sintering. The MnZn ferrite magnetic sheet provided by the invention is thin in thickness, high in magnetic conductivity, high in saturation flux density and high in Curie temperature.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and in particular relates to a MnZn ferrite magnetic sheet and a preparation method and application thereof. 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 perm...

Claims

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Application Information

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IPC IPC(8): H01F1/01H01F41/02C04B35/38
CPCC04B35/2658C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/95C04B2235/96H01F1/01H01F41/02
Inventor 王朝明於扬栋赵旭卢飞翔陈新彬吕飞雨
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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