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A ferrite sheet with a thickness greater than 200 μm, its preparation method and use

A technology of ferrite sheets and green sheets, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, parts of transformers/inductors, etc., can solve problems such as poor surface flatness, achieve good consistency, and increase yield And the effect of surface flatness and high density

Active Publication Date: 2020-07-28
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is non-toxic and pollution-free during the preparation process, the process is stable, the production efficiency is high, and it can be industrialized, but the surface smoothness of the prepared material is relatively poor

Method used

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  • A ferrite sheet with a thickness greater than 200 μm, its preparation method and use
  • A ferrite sheet with a thickness greater than 200 μm, its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] A method for preparing a ferrite sheet with a thickness greater than 200 μm, comprising the steps of:

[0066] (1) Stamping on the free surface of a tape-cast green sheet with a thickness of 500 μm using a mold with a protruding structure, the mold of the protruding structure is a square grid with a side length of 2 mm regularly arranged to obtain a tape-cast green sheet with a predetermined pattern on the free surface , the punching depth is 10% of the thickness of the tape-cast green sheet;

[0067] (2) Place two base alumina plates with a size of 0.2 mm × 150 mm × 380 mm on a base alumina plate with a size of 10 mm × 400 mm × 400 mm, and stack two tape-cast green sheets with a predetermined pattern to obtain a superposition unit, and put 3 A stacking unit is stacked on the alumina substrate, and an alumina plate is covered on the uppermost layer of the stacking unit to obtain a sintered assembly;

[0068] (3) Stack the 4 sintered assemblies described in step (2), an...

Embodiment 2

[0070] The difference from Example 1 is that the gap in step (3) is 5 mm, and a ferrite sheet is obtained.

Embodiment 3

[0072] The difference from Example 1 is that the gap in step (3) is 40 mm, and a ferrite sheet is obtained.

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Abstract

The invention relates to a ferrite sheet having a thickness of more than 200 [mu]m, a preparation method and use thereof. The preparation method of the ferrite sheet comprises the following steps: (1)stamping a cast sheet to obtain a cast sheet having a predetermined pattern; wherein the surface of the cast sheet that is in contact with air during a casting process is referred to as a free surface; (2) laminating the cast sheets having the predetermined patterns to obtain a sintering component; and (3) sintering the sintering component to obtain the ferrite sheet. A gas discharge passage is formed by leaving a gap between the stamped surface of the cast sheet and each of the sintering components. Thus, in a subsequent sintering process, the gas discharge passage can discharge a gas generated during the sintering of the cast sheet. The method, by using multilayer laminates and covering the uppermost layer of the cast sheet with a cover plate, solves the problems of warpage, cracking and poor co-firing consistency of the ferrite sheet during the sintering process in the prior art, and improves the yield of the products.

Description

technical field [0001] The invention belongs to the technical field of wireless charging, and in particular relates to a ferrite sheet with a thickness greater than 200 μm, a preparation method and application thereof. Background technique [0002] Electromagnetic induction wireless charging uses the electromagnetic induction principle of electricity generating magnetism-magnetism generating electricity, that is, "electricity" and "magnetism" can be transformed into each other. The two ends of the mobile phone and the wireless charger are respectively equipped with receiving / transmitting coils. The current of the wireless charger generates a magnetic field through the coil at the transmitting end. DC direct current used. [0003] Among wireless charging devices, there are transmitters and receivers. The transmitter is a wireless charger. The built-in ferrite sheet must use a nickel-copper-zinc soft ferrite sheet with a thickness of 200-600 μm. However, In actual production...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/34H01F27/245H01F38/14H01F41/02H02J50/10
CPCH01F1/344H01F27/245H01F38/14H01F41/0233H02J50/10
Inventor 王媛珍苏艳锋於扬栋
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD