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Fly ash glass bead-ferrite compound microwave absorbing material and preparation method thereof

A composite wave-absorbing material and glass microsphere technology, applied in the field of wave-absorbing materials, can solve problems such as narrow wave-absorbing frequency band, uneven distribution of wave-absorbing agent, and high density

Inactive Publication Date: 2018-12-07
GUANGDONG TSINGDA TONGKE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is to use nano-Fe 3 o 4 Dispersed in fly ash glass microspheres, the absorbing material obtained by compounding with cement, this preparation method cannot make good use of the cell structure of hollow microspheres to reflect and absorb electromagnetic waves, because the cell structure of glass microspheres does not play a role, the addition of nano-Fe 3 o 4 The powder is easy to agglomerate and not easy to disperse, resulting in uneven distribution of wave absorbing agent
Fe 3 o 4 There are still some disadvantages for absorbing materials, such as high density (5.18g / cm 3 ), narrow absorbing frequency band, low absorbing intensity, etc.

Method used

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  • Fly ash glass bead-ferrite compound microwave absorbing material and preparation method thereof

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preparation example Construction

[0025] The present invention provides a preparation method of the composite wave-absorbing material described in the above technical solution, comprising the following steps:

[0026] mixing the sol raw material with ferric nitrate and glycine to obtain a precursor solution; the sol raw material is selected from one or more of barium nitrate, manganese nitrate, cobalt nitrate and nickel nitrate;

[0027] Adjust the pH value of the precursor solution to 6.8-7.2, add fly ash glass beads, stir at 85-95°C to obtain a wet gel; after drying, obtain a dry gel;

[0028] The dry gel is sintered at 800-900° C. to obtain a composite wave-absorbing material of fly ash glass microspheres and ferrite.

[0029]In the invention, the sol raw material is mixed with iron nitrate and glycine to obtain a precursor solution; the sol raw material is selected from one or more of barium nitrate, manganese nitrate, cobalt nitrate and nickel nitrate. Alcohols are also added when the sol raw material is...

Embodiment 1

[0035] (1) Preparation of sol solution

[0036] Weigh ferric nitrate, barium nitrate and aminoacetic acid respectively according to the stoichiometric ratio, add distilled water to dissolve, and obtain barium ferrite BaFe 12 o 19 A precursor solution, wherein the molar ratio of aminoacetic acid to metal ions is 2.5:1, and an appropriate amount of ethylene glycol is added simultaneously;

[0037] (2) Coating with absorbing agent

[0038] First drop ammonia water to adjust the pH value of the precursor solution to 7, then add fly ash glass beads according to the mass ratio of fly ash glass beads to ferrite is 1:1, and keep stirring to make the sol solution evenly coated on Fly ash glass bead surface.

[0039] (3) Gelation

[0040] The coated mixed sol solution was placed in a water bath at 90°C and stirred until the liquid became a viscous colloid, and the prepared sol was dried at 120°C to obtain a xerogel.

[0041] (4) Sintering

[0042] Put the gel in a muffle furnace a...

Embodiment 2

[0045] (1) Preparation of sol solution

[0046] Weigh ferric nitrate, barium nitrate, cobalt nitrate and aminoacetic acid respectively according to the stoichiometric ratio, add distilled water to dissolve, and form barium cobalt ferrite BaCo x Fe 12-x o 19 (x=0.8) precursor solution, wherein glycine and metal ion molar ratio is 2.5:1, adds appropriate amount of polyethylene glycol simultaneously;

[0047] (2) Coating with absorbing agent

[0048] First drop ammonia water to adjust the pH value of the precursor solution to 7, then add fly ash glass beads according to the mass ratio of fly ash glass beads to ferrite of 1.5:1, and keep stirring to make the sol solution evenly coated on the Fly ash glass bead surface.

[0049] (3) Gelation

[0050] The coated mixed sol solution was placed in a water bath at 90°C and stirred until the liquid became a viscous colloid, and the prepared sol was dried at 120°C to obtain a xerogel.

[0051] (4) Sintering

[0052] Put the gel in ...

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Abstract

The invention provides a fly ash glass bead-ferrite compound microwave absorbing material and a preparation method thereof. The compound microwave absorbing material comprises fly ash glass beads andferrite coating the surface of the fly ash glass beads, wherein the ferrite is selected from one or more of barium ferrite BaFe12O19, barium cobalt ferrite BaCox1Fe(12-x1)O19, nickel barium ferrite BaNix2Fe(12-x2)O19 and manganese ferrite MnFe12O19, wherein x1 is 0.5-1, and x2 is 0.5-1. The compound microwave absorbing material has excellent microwave absorbing performance by coating the fly ash glass beads with a specific type of ferrite, has light weight and certain sound absorption effect. The compound microwave absorbing material has a density of 0.6-1g / cm<3>, and has a sound absorption coefficient of 0.34-0.66 and echo reduced by 5-8dB in 1-5kHz.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a composite wave-absorbing material of fly ash glass beads-ferrite and a preparation method thereof. Background technique [0002] Fly ash glass microspheres (referred to as floating beads) are hollow, light, spherical particles with a relatively uniform particle size emitted from coal-fired power plants. It has the characteristics of high temperature resistance, corrosion resistance, insulation, heat insulation, stable chemical properties, high strength, and non-toxic. Although the glass microsphere itself does not have microwave-absorbing performance, if the surface of the glass microsphere is coated with one or several layers of a wave-absorbing agent with good chemical stability and strong microwave-absorbing ability, it can not only reduce costs, effectively utilize resources, but also The density of the material is reduced to obtain an ideal li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00H05K9/00
CPCC09K3/00H05K9/0081
Inventor 常杰善王川行李伟雄窦明岳孟祥明
Owner GUANGDONG TSINGDA TONGKE ENVIRONMENTAL PROTECTION TECH CO LTD
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