Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Magnetic microwave absorbing cement and preparation method thereof

A magnetic wave-absorbing and cement-based technology, which is applied in cement production and other fields, can solve the problems of low performance, poor weather resistance and corrosion resistance, and high raw material prices, and achieve the effect of low cost and strong wave-absorbing ability

Inactive Publication Date: 2018-06-05
HUNAN AEROSPACE MAGNET & MAGNETO
View PDF3 Cites 0 Cited by
  • 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] Sr ferrite is a hard magnetic material with stable chemical properties and acid and alkali resistance. It has been widely used in the fields of motors, electrical appliances, and audio. However, it has not been reported in the application of wave-absorbing materials.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A magnetic wave-absorbing cement, comprising Sr ferrite grinding recycled material and Portland cement, the filling rate of the Sr ferrite grinding recycled material is 45vol%, and the Sr ferrite grinding recycled material is The particle diameter D50 was 0.83 μm.

[0028] The reclaimed Sr ferrite grinding material refers to the powder material obtained by grinding and drying the reclaimed material from surface grinding of the Sr ferrite magnetic tile.

[0029] The Sr 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 st...

Embodiment 2

[0037] A magnetic wave-absorbing cement, comprising Sr ferrite grinding recycled material and Portland cement, the filling rate of the Sr ferrite grinding recycled material is 45vol%, and the Sr ferrite grinding recycled material is The particle diameter D50 was 3.8 μm.

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

[0039] The reclaimed Sr ferrite grinding 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 15mm and a loss of -13.4dB in the 8-18GHz frequency band.

Embodiment 3

[0043] A magnetic wave-absorbing cement, comprising Sr ferrite grinding recycled material and Portland cement, the filling rate of the Sr ferrite grinding recycled material is 75vol%, and the Sr ferrite grinding recycled material is The particle diameter D50 was 3.8 μm.

[0044] The reclaimed Sr ferrite grinding material refers to the powder material obtained by grinding and drying the reclaimed material from surface grinding of the Sr ferrite magnetic tile.

[0045] The reclaimed Sr ferrite grinding 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 15 mm and a loss of -15.8 dB in the 8-18 GHz frequency band.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle diameteraaaaaaaaaa
Particle diameteraaaaaaaaaa
Particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to magnetic microwave absorbing cement and a preparation method thereof. The magnetic microwave absorbing cement comprises Sr ferrite grinding reclaimed material and Portland cement, wherein the filling rate of the Sr ferrite grinding reclaimed material is 45-75vol%, the particle diameter D50 of the Sr ferrite grinding reclaimed material is 0.8-4mirons. The invention also comprises a preparation method of the magnetic microwave absorbing cement. According to the invention, the Sr ferrite grinding reclaimed material is doped into the cement, the microwave absorbing capability of the cement in 15mm within 8-18GHz frequency band after molding curing can reach -13dB, 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B7/345C04B7/24C04B7/02C04B7/38
CPCC04B7/02C04B7/22C04B7/24C04B7/345C04B7/38Y02P40/10
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com