Preparation method of mica plate with electromagnetic wave absorption function

A technology for absorbing electromagnetic waves and mica boards, applied in the field of preparation of mica boards, can solve the problems of volatilization and release of toxic and harmful substances, pyrolysis of organic matter, etc., and achieve the effect of improving insulation performance, excellent high temperature resistance and wave absorption performance

Pending Publication Date: 2020-06-12
林晓军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using mica boards containing organic binders, there is also the risk of pyrolysis of organic matter and the release of toxic and harmful substances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 15 parts of mica powder, 12 parts of barium ferrite powder, 8 parts of flaky sendust powder and 1.4 parts of sodium silicate solution into the mixer in parts by weight, stir for 75 minutes to make it evenly mixed, then continue to stir and Dry at a temperature of 110°C, and obtain a primary composite powder after lowering to normal temperature; add another 85 parts of mica powder and 8 parts of silica sol to the primary composite powder in order by weight, stir for 75 minutes to make it evenly mixed, and then continue Stir and dry at a temperature of 80°C, and obtain secondary composite powder after lowering to normal temperature; place the secondary composite powder in a press mold, and press it into a slab under a pressure of 45MPa; place the slab in a nitrogen furnace, Insulate at 700°C for 15 minutes to make it completely solidified, and obtain a mica board with a wave-absorbing function. After testing in the range of 1GHz~8GHz, the absorption performance of the...

Embodiment 2

[0016] Add 20 parts of mica powder, 10 parts of barium ferrite powder, 7 parts of flaky sendust powder and 1.5 parts of sodium silicate solution into the mixer in parts by weight, stir for 60 minutes to make it evenly mixed, then continue to stir and Dry at a temperature of 110°C, and obtain a primary composite powder after lowering to normal temperature; add another 80 parts of mica powder and 8 parts of silica sol to the primary composite powder in order by weight, stir for 60 minutes to make it evenly mixed, and then continue Stir and dry at a temperature of 80°C, and obtain secondary composite powder after lowering to normal temperature; place the secondary composite powder in a press mold, and press it into a slab under a pressure of 45MPa; place the slab in a nitrogen furnace, Insulate at 400° C. for 45 minutes to make it completely solidified to obtain a mica board with a wave-absorbing function. After testing in the range of 1GHz~8GHz, the absorption performance of the...

Embodiment 3

[0018] Add 18 parts of mica powder, 15 parts of barium ferrite powder, 10 parts of flaky sendust powder and 1.8 parts of sodium silicate solution into the mixer in parts by weight, stir for 90 minutes to make it evenly mixed, then continue to stir and Dry at a temperature of 90°C, and get a primary composite powder after lowering to normal temperature; add another 82 parts of mica powder and 6 parts of silica sol to the primary composite powder in order by weight, stir for 90 minutes to make it evenly mixed, and then continue Stir and dry at a temperature of 60°C, and obtain a secondary composite powder after cooling down to normal temperature; place the secondary composite powder in a press mold, and press it into a slab under a pressure of 50MPa; place the slab in a nitrogen furnace, Keep it warm at 600°C for 30 minutes to make it completely solidified, and obtain a mica board with a wave-absorbing function. After testing in the range of 1GHz~8GHz, the absorption performance...

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Abstract

The invention discloses a preparation method of a mica plate with an electromagnetic wave absorption function. The preparation method comprises the following steps: (1) primarily mixing: adding mica powder, barium ferrite powder, flaky iron-silicon-aluminum powder and a sodium silicate solution into a mixer in parts by weight, stirring for 60-90 min to uniformly mix, continuously stirring, dryingat the temperature of 90-110 DEG C, and cooling to normal temperature to obtain primary composite powder; (2) secondarily mixing: sequentially adding additionally taken mica powder and silica sol intothe primary composite powder in step (1) in parts by weight, stirring for 60-90 min to uniformly mix, continuously stirring, drying at the temperature of 60-80 DEG C, and cooling to normal temperature to obtain secondary composite powder; (3) pressing: putting the secondary composite powder obtained in step (2) into a press mold, and pressing the secondary composite powder into a plate blank under the pressure of 40-60 MPa; and (4) carrying out high-temperature curing: putting the plate blank in step (3) in a nitrogen furnace, and carrying out heat preservation for 15-45 min at the temperature of 400-700 DEG C to enable the plate blank to be completely cured in order to obtain the mica plate with the electromagnetic wave absorption function.

Description

technical field [0001] The invention relates to the technical field of mica board preparation, in particular to a method for preparing a mica board with the function of absorbing electromagnetic waves. Background technique [0002] Electromagnetic radiation is ubiquitous in people's production and life. Electromagnetic waves generated by electric heating equipment will not only damage human health, but also interfere with the operation of other equipment. At the same time, the operation of electric heating equipment itself will also be affected by external electromagnetic waves. As a high temperature resistant insulating material, mica board is widely used in electric heating equipment such as intermediate frequency furnaces, high frequency furnaces, microwave ovens, industrial electric furnaces, and household electric heating appliances. How to prepare a mica plate with the function of absorbing electromagnetic waves is an urgent problem to be solved. [0003] Mica board ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26
CPCC04B28/26C04B2111/00258C04B14/20C04B14/363C04B14/34C04B22/06
Inventor 林晓军
Owner 林晓军
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