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Low-temperature sintered flexible magnetic sheet and preparation method thereof

A flexible magnetic sheet, low-temperature sintering technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., to achieve the effects of reducing production costs, solving the adhesion of upper and lower magnetic sheets, and reducing the sintering temperature

Active Publication Date: 2021-11-30
TDG HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent with the notification number CN110156449B discloses a method for improving the reliability of ferrite materials, but it does not involve low-temperature sintering, and there is no requirement for the power loss performance of the material

Method used

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  • Low-temperature sintered flexible magnetic sheet and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, a low-temperature sintered flexible magnetic sheet is prepared according to the following method:

[0027] 1) Mixing of raw materials: mix the raw materials in proportion to Fe 2 o 3 : 69.5 wt%, ZnO: 7.00wt% and the balance of MnO are used for batching and sanding, mixed evenly and then dried;

[0028] 2) Pre-burning: Put the dried powder into the firing bowl and put it into the pre-burning furnace and heat it to 850°C at a heating rate of 5°C / min for two hours;

[0029] 3) High-energy ball milling: After vibrating the pre-burned powder, add the auxiliary component CaCO 3 :500ppm, Nb 2 o 5 :200, CuO:1000ppm, Co 2 o 3 : 3000ppm, B 2 o 3 -ZnO-Li 2 O series glass: 1000ppm, then ball milling 2h in a high-energy ball mill to obtain D50 is 150-250nm, and D90 is nano-scale magnetic powder of 250-450nm;

[0030] 4) Pulping: Put the nano-scale magnetic powder prepared in step 3) with xylene, ethanol, and safflower oil in a certain proportion and mix...

Embodiment 2

[0035] In this embodiment, a low-temperature sintered flexible magnetic sheet is prepared according to the following method:

[0036] 1) Mixing of raw materials: mix the raw materials in proportion to Fe 2 o 3 : 69.5 wt%, ZnO: 7.00wt% and the remainder MnO to carry out batching and carry out sanding, dry after mixing evenly;

[0037] 2) Pre-burning: Put the dried powder into the firing bowl and put it into the pre-burning furnace and heat it to 850°C at a heating rate of 5°C / Min for two hours for pre-burning;

[0038] 3) High-energy ball milling: After vibrating the pre-burned powder, add the auxiliary component CaCO 3 :500ppm, Nb 2 o 5 :200, CuO:1000ppm, Co 2 o 3 : 3000ppm, Bi 2 o 3 -B 2 o 3 -SiO 2 System glass: 500ppm, then ball milling 2h in a high-energy ball mill to obtain D50 is 150-250nm, and D90 is nano-scale magnetic powder of 250-450nm;

[0039] 4) Pulping: Put the nano-scale magnetic powder prepared in step 3) with xylene, ethanol, and safflower oil in a c...

Embodiment 3

[0044] In this embodiment, a low-temperature sintered flexible magnetic sheet is prepared according to the following method:

[0045] 1) Mixing of raw materials: mix the raw materials in proportion to Fe 2 o 3 : 69.5 wt%, ZnO: 7.00wt% and the remainder MnO to carry out batching and carry out sanding, dry after mixing evenly;

[0046] 2) Pre-burning: Put the dried powder into the firing bowl and put it into the pre-burning furnace and heat it to 850°C at a heating rate of 5°C / Min for two hours for pre-burning;

[0047] 3) High-energy ball milling: After vibrating the pre-burned powder, add the auxiliary component CaCO 3 :500ppm, Nb 2 o 5 :200, CuO:1000ppm, Co 2 o 3 : 3000ppm, Bi 2 o 3 -B 2 o 3 -SiO 2 System glass: 500ppm, then obtain D50 and be 400-500nm by ball milling 1h in high-energy ball mill, D90 is the nanoscale magnetic powder of 500-700nm;

[0048] 4) Pulping: Put the nano-scale magnetic powder prepared in step 3) with xylene, ethanol, and safflower oil in ...

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Abstract

The invention provides a low-temperature sintered flexible magnetic sheet and a preparation method thereof. Nanoscale ferrite magnetic powder is obtained mainly through a high-energy ball mill, glass powder is doped in the nanoscale ferrite magnetic powder, and finally, a product with a compact structure is obtained by sintering the ferrite magnetic powder at a relatively low temperature. As the particle size uniformity of the used powder is high, the consistency of the electromagnetic performance of the sample is also high. The problem of adhesion of the upper layer and the lower layer of the magnetic sheet during sintering is avoided by sintering at low temperature, and meanwhile, the effects of reducing energy consumption and reducing production cost are achieved. The preparation method comprises the main steps of raw material mixing, 2) pre-sintering, 3) high-energy ball milling, 4) pulping, 5) curtain coating, 6) sintering and 7) film coating and splitting; and finally the magnetic sheet with low loss, high Bs and high toughness is obtained.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a soft magnetic flexible material and a preparation process thereof. Background technique [0002] With the rise of wireless charging technology in recent years, magnetic shielding materials in wireless charging devices have received increasing attention. In the wireless charging system, the magnetic shielding material can enhance the coil induction magnetic field, improve the coil coupling coefficient, and then improve the charging efficiency; at the same time, it can shield the attenuation interference of the metal conductor to the coil magnetic field, prevent the eddy current loss from causing the battery to heat up, and realize the wireless charging system and terminal equipment. EMC function. At present, there are four kinds of widely used wireless charging magnetic shielding materials: manganese-zinc ferrite thin magnetic sheet, nickel-zinc ferrite thin magnetic...

Claims

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Application Information

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IPC IPC(8): C04B35/26H01F1/34
CPCC04B35/265H01F1/344C04B2235/3284C04B2235/3279C04B2235/3262C04B2235/36C04B2235/6025C04B2235/3208C04B2235/3251C04B2235/3281C04B2235/6565C04B2235/3275C04B2235/3203C04B2235/3409C04B2235/6562C04B2235/6567
Inventor 李赟邢冰冰张强原王鸿健张志新黄艳锋盖鹏祥李伟健
Owner TDG HLDG CO LTD
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