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Magnetic wave-absorbing cement and preparation method thereof

A magnetic wave absorbing and cement technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of low performance, high raw material price, poor weather resistance and corrosion resistance, etc. The effect of environmental protection, low cost and strong wave absorbing ability

Inactive Publication Date: 2018-05-18
HUNAN AEROSPACE MAGNET & MAGNETO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Third, the previous absorbing materials used a large amount of metals and organic substances, and their weather resistance and corrosion resistance were poor.
[0003] In previous related inventions, cement was doped with carbon black, ferric oxide, barium titanate or even graphene to improve the wave-absorbing performance of Portland cement, although it can achieve good wave-absorbing effects in certain frequency bands , but the performance is still not high, and the price of many raw materials in its composition is relatively high, which makes the cost of wave-absorbing cement too high and it is difficult to promote it on a large scale
[0004] MnZn ferrite is a soft magnetic material with stable chemical properties and acid and alkali resistance. It is mainly used to make transformers and inductors, and is widely used in various electronic equipment. However, it has not been reported to apply it to wave-absorbing cement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A magnetic wave-absorbing cement, comprising MnZn ferrite grinding recycled material and Portland cement, the filling rate of the MnZn ferrite grinding recycled material is 40vol%, and the MnZn ferrite grinding recycled material is The particle diameter D50 was 0.65 μm.

[0028] The recycled MnZn ferrite grinding material refers to the powder material obtained by grinding and drying the recycled MnZn ferrite core surface grinding material.

[0029] The MnZn ferrite grinding reclaimed material is processed through grinding and drying, and the specific steps are as follows:

[0030] (1) Collect the grinding debris, filter it with a 50-mesh screen, and separate the large pieces;

[0031] (2) Pour the filtered slurry into the sedimentation tower for precipitation, release part of the surface water, and control the water content at 55wt%;

[0032] (3) Pour the precipitated slurry into a roller ball mill for ball milling, the ball-to-material ratio is 4:1, the steel ball si...

Embodiment 2

[0037] A magnetic wave-absorbing cement, comprising MnZn ferrite grinding recycled material and Portland cement, the filling rate of the MnZn ferrite grinding recycled material is 40vol%, and the MnZn ferrite grinding recycled material is The particle diameter D50 was 2.9 μm.

[0038] The recycled MnZn ferrite grinding material refers to the powder material obtained by grinding and drying the recovered material from grinding the surface of the MnZn ferrite magnetic ring.

[0039] The MnZn ferrite grinding reclaimed material is ground and dried, and the specific steps are the same as those in Example 1.

[0040] The preparation method of the magnetic wave-absorbing cement is the same as in Example 1.

[0041] The magnetic wave-absorbing cement is molded and solidified, with a thickness of 15 mm and a loss of -15.8 dB in the 8-18 GHz frequency band.

Embodiment 3

[0043] A magnetic wave-absorbing cement, comprising MnZn ferrite grinding recycled material and Portland cement, the filling rate of the MnZn ferrite grinding recycled material is 70vol%; the MnZn ferrite grinding recycled material The particle diameter D50 was 2.8 μm.

[0044] The recycled MnZn ferrite grinding material refers to the powder material obtained by grinding and drying the recycled MnZn ferrite core surface grinding material.

[0045] The MnZn ferrite grinding reclaimed material is ground and dried, and the specific steps are the same as those in Example 1.

[0046] The preparation method of the magnetic wave-absorbing cement is the same as in Example 1.

[0047] The magnetic wave-absorbing cement is molded and solidified, with a thickness of 15mm and a loss of -16.4dB in the 8-18GHz frequency band.

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Abstract

The invention relates to a magnetic wave-absorbing cement and a preparation method thereof. The magnetic wave-absorbing cement includes a ground MnZn ferrite recycled material and Portland cement. Thefilling rate of the ground MnZn ferrite recycled material is 40-70vol%, and the particle diameter D50 of the ground MnZn ferrite recycled material is to 0.6-3microm. The invention also includes a preparation method of the magnetic wave-absorbing cement. According to the invention, cement is doped with the ground MnZn ferrite recycled material, after molding curing, the cement has a 15mm thicknesswave-absorbing ability up to -15dB or more within the frequency band of 8-18GHz, and the cost is very low.

Description

technical field [0001] The invention relates to a material with integrated electromagnetic function and structure, in particular to a magnetic wave-absorbing cement and a preparation method thereof. Background technique [0002] At present, electromagnetic radiation is becoming more and more serious, and many special buildings have raised the requirement of anti-electromagnetic interference. The absorbing material used to be a military technology, but in recent years it has been turned into a civilian field with the increase of civilian frequency. First of all, the traditional design methods of absorbing materials are accustomed to using very expensive materials, such as carbonyl iron powder, carbonyl iron fiber, flake alloy powder, ferrite powder, carbon fiber, glass microspheres, epoxy resin and so on. Second, in the military field, in addition to ensuring the absorbing performance, the technology of absorbing materials often emphasizes thinness and lightness. As for civi...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/04C04B20/02
CPCC04B18/0481C04B28/04C04B2111/00258C04B2111/00422C04B20/026C04B20/04Y02W30/91
Inventor 颜铄清姚锐周宇肖丹陈晓宇王琛胡盛青张铁军
Owner HUNAN AEROSPACE MAGNET & MAGNETO
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