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A preparation method of low-cost environment-friendly microwave absorber

A microwave absorption, low-cost technology, applied in antennas, electrical components, etc., to achieve the effect of enhancing effective electromagnetic absorption performance, low cost, and solving grain boundary air gaps

Active Publication Date: 2022-03-15
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at a series of bottleneck problems existing in the current ferrite product solid waste recovery technology for different applications, the present invention proposes a low-cost and environmentally friendly microwave absorber preparation method based on the grain boundary diffusion scheme

Method used

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  • A preparation method of low-cost environment-friendly microwave absorber
  • A preparation method of low-cost environment-friendly microwave absorber
  • A preparation method of low-cost environment-friendly microwave absorber

Examples

Experimental program
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Effect test

Embodiment 1

[0030] This example uses grinding solid waste, waste green body, and waste products generated during the production process of electromagnetic wave absorption, soft magnetic core materials, and devices as raw materials, and is washed and dispersed, dried and sieved, and ball milled once. Secondary ball milling, pressing molding, high-temperature sintering and other processes to obtain a high-density microwave absorber. The mass ratio of the two solid wastes is 1:9. The specific steps are as follows:

[0031] Step 1: Take the crushed MnZn ferrite magnetic core solid waste powder, and after washing, purifying, drying, sieving and other processes, a powder 1 with a particle size of about 1-75 μm is obtained.

[0032] Step 2: Take the broken manganese-zinc-ferrite wave-absorbing solid waste powder, after washing, purifying, drying and other processes, add it to the ball mill tank according to the ratio of powder: water: ball milling beads mass ratio of 1:1:5 , wet ball milling at ...

Embodiment 2

[0037] This example uses grinding solid waste, waste green body, and waste products generated during the production process of electromagnetic wave absorption, soft magnetic core materials, and devices as raw materials, and is washed and dispersed, dried and sieved, and ball milled once. Secondary ball milling, pressing molding, high-temperature sintering and other processes to obtain a high-density microwave absorber. The mass ratio of the two solid wastes is 1:2.33. The specific steps are as follows:

[0038] Step 1: Take the crushed MnZn ferrite magnetic core solid waste powder, and after washing, purifying, drying, sieving and other processes, a powder 1 with a particle size of about 1-75 μm is obtained.

[0039] Step 2: Take the crushed manganese-zinc-ferrite wave-absorbing solid waste powder, after washing, purifying, drying and other processes, add it to the ball milling tank according to the mass ratio of powder: water: ball milling beads: 1:1.2:6 In the process, wet b...

Embodiment 3

[0044] This example uses grinding solid waste, waste green body, and waste products generated during the production process of electromagnetic wave absorption, soft magnetic core materials, and devices as raw materials, and is washed and dispersed, dried and sieved, and ball milled once. Secondary ball milling, pressing molding, high-temperature sintering and other processes to obtain a high-density microwave absorber. The mass ratio of the two solid wastes is 1:2.33. The specific steps are as follows:

[0045] Step 1: Take the crushed MnZn ferrite magnetic core solid waste powder, and after washing, purifying, drying, sieving and other processes, a powder 1 with a particle size of about 1-75 μm is obtained.

[0046] Step 2: Take the crushed manganese zinc ferrite wave-absorbing solid waste powder, after washing, purifying, drying and other processes, add it to the ball mill tank according to the mass ratio of powder: water: ball milling beads: 1:1.5:8 In the process, wet ball...

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Abstract

The invention discloses a method for preparing a low-cost and environment-friendly microwave absorber. By combining the differential characteristics of two types of solid waste formula elements, such as manganese-zinc ferrite cores and microwave absorbers, a zinc-rich absorber is designed to be filled with rich The structure of the grain boundary of the manganese magnetic core material, and the use of high-energy mechanical alloying combined with segmental heat treatment to diffuse and dope the low-loss solid waste grain interface of the magnetic core to enhance the electromagnetic loss and wave-absorbing performance of the absorber. At the same time, the design of the present invention utilizes the growth and diffusion of the fine-grained wave-absorbing material at the large-grain interface of the magnetic core material to effectively solve the common problem of air gaps in solid waste-based microwave absorbers, improve its effective microwave absorption performance, and at the same time enhance The mechanical properties of the absorber. The invention completely uses ferrite solid waste as a raw material, has extremely low preparation cost, and is suitable for the application of practical and environment-friendly microwave absorbing products.

Description

technical field [0001] The invention relates to a method for preparing a microwave absorber, in particular to a method for preparing microwave absorbing materials and devices based on various types of ferrite solid waste, and belongs to the field of electromagnetic functional materials. Background technique [0002] With the rapid development of the Internet and artificial intelligence, the Internet of Everything has become a theme for a long time now and even in the future, and electromagnetic waves, as an indispensable medium for transmitting information, have caused a lot of clutter in the space while being widely used. The frequency of high-intensity electromagnetic waves has caused serious problems such as electromagnetic interference and electromagnetic radiation, especially electromagnetic interference has seriously affected the normal use of various electronic and electrical products. In addition, in 2020, the China Association for Science and Technology also release...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/38C04B35/622C04B35/626H01Q17/00
CPCC04B35/2658C04B35/622C04B35/6261C04B35/62695C04B35/62204H01Q17/004
Inventor 汪嘉恒吴运飞吴玉程沈宏江张学舟鲍智勇张勇李欣兴吕楠
Owner HEFEI UNIV OF TECH
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