CN1644546A - Composite wave absorbing material and production thereof - Google Patents
Composite wave absorbing material and production thereof Download PDFInfo
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- CN1644546A CN1644546A CN 200410099155 CN200410099155A CN1644546A CN 1644546 A CN1644546 A CN 1644546A CN 200410099155 CN200410099155 CN 200410099155 CN 200410099155 A CN200410099155 A CN 200410099155A CN 1644546 A CN1644546 A CN 1644546A
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- glass phase
- composite wave
- sintered glass
- barium ferrite
- suction material
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Abstract
A composite wave-absorbing material and its production are disclosed. The multi-hole glass phase micro-particle surface is coated by barium ferrite thin film, the mass ratio of multi-hole glass phase and ferrite is 0.1-10:1. The barium ferrite layer is produced on multi-hole glass phase micro-particle surface by citrate sol-gel method. The absorbing frequency range of composite material is wider than the barium ferrite. It can be used for electromagnetic wave absorbing material of aircraft and building coating.
Description
Technical field
The present invention relates to a kind of absorbing material and preparation technology thereof, relate in particular to a kind of composite wave-suction material and preparation technology thereof.
Background technology
Along with development of modern science and technology, the environmental pollution that electromagenetic wave radiation produced has become new social effects of pollution.Electromagnetic radiation is very big to the influence of living environment and Working environment, and electromagnetic environment is polluted and to have been caused many detrimentally affects, will become one of important indicator of environmental protection to the requirement of hertzian wave Pollution abatement.In the scope that electromagnetic radiation covered (public building, public place, resident living residential district etc.), from buildings itself take measures (making absorption of electromagnetic wave), promptly adopt the novel environment friendly absorbing material, the electromagnetic intensity that the various electrical equipment of can decaying produce is effectively avoided the harm of electromagenetic wave radiation to residents ' health.Therefore the novel environment friendly absorbing material has a wide range of applications and market.
The lossy medium of absorbing material is divided into electrical loss type and magnetic loss type two big classes.The former is as electrically conductive graphite, metallic staple, barium titanate and conduction high polymer etc., and its principal feature is to have higher electrical loss tangent, relies on the electronic polarization of medium or interfacial polarization decay to absorb hertzian wave; The latter comprises ferrite etc., has higher magnetic loss tangent angle, relies on magnetic polarization mechanism decay such as magnetic hysteresis loss, domain wall resonance and aftereffect loss, absorbs hertzian wave.
Present widely used absorbing material is a ferrite.Ferrite Material has frequency response characteristic preferably, and its relative magnetic permeability is bigger, and relative permittivity is less, be fit to make matching layer, widens at low frequency to have a good application prospect aspect the frequency band.Main drawback is that density is big, temperature stability is relatively poor.Therefore working out a kind of is the research direction of absorbing material to absorption of electromagnetic wave wide frequency range, electricity, composite wave-suction material that magnetic loss angle tangent numerical value is bigger.
Summary of the invention
At the deficiency that prior art exists, it is a kind of to absorption of electromagnetic wave range of frequency broad and electricity, composite wave-suction material that magnetic loss angle tangent numerical value is bigger that one of purpose of the present invention is to provide;
Another object of the present invention is to provide the preparation technology of this absorbing material.
Goal of the invention of the present invention is achieved by the following technical solution:
A kind of composite wave-suction material is at sintered glass phase microparticle surfaces coated with barium ferrite film, and described sintered glass phase and barium ferrite mass ratio are 0.1～10: 1.
The main chemical constitution of described sintered glass phase is SiO
2, Al
2O
3, CaO, MaO.
The preparation technology of this composite wave-suction material is as follows:
A, the preparation Citrate trianion aqueous solution are with Fe
3+, Ba
2Be complexed to and have on the multi-functional citric acid molecule;
B, add sintered glass phase particulate in the solution that makes, splash into ammoniacal liquor and regulate pH value, solution places stirred in water bath to colloidal, and prepared colloidal sol is adopted vacuum-drying, cryodrying or heat drying, obtains desiccant gel.
C, the gained gel is placed retort furnace internal heating, at high temperature Fe
3+, Ba
2With O
2Solid state reaction takes place, and generates barium ferrite (BaO6Fe at sintered glass phase microparticle surfaces
2O
3) film.
The mass ratio of three kinds of compounds is in the described A step: Ba (NO
3)
2: Fe (NO
3)
3: citric acid=1: 1～20: 1～30
The temperature rise rate of gel when the retort furnace internal heating is 30～150 ℃/h in the described C step, when being warming up to 600～1300 ℃, and insulation 1～5h.
This patent adopts citrate sol-gel method to prepare the barium ferrite layer at sintered glass phase microparticle surfaces.The chemical constitution of sintered glass phase is mainly SiO
2, Al
2O
3, CaO, MaO.Behind the barium ferrite parcel glassy phase, owing to form porous, the tortuous corrugated of inhaling behind porous hollow glass spherome surface deposition, the coating ferrite film, make hertzian wave in the medium communication process, form multiple reflection, refraction, barium ferrite is able to abundant absorption of electromagnetic energy in this process, strengthen attenuation of Electromagnetic, make the more single barium ferrite of absorbing property of porous vitreum surface deposition barium ferrite composite wave-suction material have better absorbing property.Behind sintered glass phase surface deposition barium ferrite thin layer, than the barium ferrite broadening, electricity, magnetic loss angle tangent numerical value are bigger to the absorption of electromagnetic wave range of frequency for matrix material, can produce effectively the hertzian wave of corresponding frequencies to absorb.
Description of drawings
Figure 1A is the graph of relation of sintering barium ferrite magnetic loss angle tangent and frequency.
Figure 1B is the graph of relation of sintering barium ferrite electrical loss angle tangent and frequency.
Fig. 2 A is the graph of relation of BEG magnetic loss angle tangent of the present invention and frequency.
Fig. 2 B is the graph of relation of BEG electrical loss angle tangent of the present invention and frequency.
Embodiment
How further specify the present invention below in conjunction with embodiment realizes:
Embodiment 1
Adopt citric acid complex iron nitrate, nitrate of baryta to make presoma.Stoichiometric ratio: Ba (NO
3)
2: Fe (NO
3)
3: citric acid=1: 12: 19.Preparation solution adds the sintered glass phase in solution.The theoretical product quality ratio of sintered glass phase and ferrite is 1: 1.Splashing into ammoniacal liquor, to be adjusted to pH value be 7.Solution places 90 ℃ of stirred in water bath 4～5h, to liquid be the heavy-gravity colloidal.Prepared colloidal sol places 120 ℃ of baking oven 4h, obtains desiccant gel.The gained gel is placed the retort furnace internal heating, temperature rise rate: 60 ℃/h, when being warming up to 850 ℃, insulation 1h.
Embodiment 2
Adopt citric acid complex iron nitrate, nitrate of baryta to make presoma.Stoichiometric ratio: Ba (NO
3)
2: Fe (NO
3)
3: citric acid=1: 12: 13.Preparation solution adds the sintered glass phase in solution.The theoretical product quality ratio of sintered glass phase and ferrite is 3: 1.Splashing into ammoniacal liquor, to be adjusted to pH value be 7.Solution places 90 ℃ of stirred in water bath 4～5h, to liquid be the heavy-gravity colloidal.Prepared colloidal sol places 120 ℃ of baking oven 4h, obtains desiccant gel.The gained gel is placed the retort furnace internal heating, temperature rise rate: 80 ℃/h, when being warming up to 950 ℃, insulation 1h.
Embodiment 3
Adopt citric acid complex iron nitrate, nitrate of baryta to make presoma.Stoichiometric ratio: Ba (NO
3)
2: Fe (NO
3)
3: citric acid==1: 12: 15.Preparation solution adds the sintered glass phase in solution.The theoretical product quality ratio of sintered glass phase and ferrite is 5: 1.Splashing into ammoniacal liquor, to be adjusted to pH value be 7.Solution places 90 ℃ of stirred in water bath 4～5h, to liquid be the heavy-gravity colloidal.Prepared colloidal sol places 120 ℃ of baking oven 4h, obtains desiccant gel.The gained gel is placed the retort furnace internal heating, temperature rise rate: 30 ℃/h, when being warming up to 650 ℃, insulation 5h.
Embodiment 4
Adopt citric acid complex iron nitrate, nitrate of baryta to make presoma.Stoichiometric ratio: Ba (NO
3)
2: Fe (NO
3)
3: citric acid=1: 12: 25.Preparation solution adds the sintered glass phase in solution.The theoretical product quality ratio of sintered glass phase and ferrite is 5: 1.Splashing into ammoniacal liquor, to be adjusted to pH value be 7.Solution places 90 ℃ of stirred in water bath 4～5h, to liquid be the heavy-gravity colloidal.Prepared colloidal sol places 120 ℃ of baking oven 4h, obtains desiccant gel.The gained gel is placed the retort furnace internal heating, temperature rise rate: 140 ℃/h, when being warming up to 1200 ℃, insulation 3h.
The barium ferrite material has frequency response characteristic preferably, is widely used absorbing material, and its relative magnetic permeability is bigger, and relative permittivity is less, be fit to make matching layer, widens at low frequency to have a good application prospect aspect the frequency band.Main drawback is that density is big, temperature stability is relatively poor.Sintered glass is spheroidal particle mutually, and granularity is tens microns, inner porous or hollow.Behind sintered glass phase surface deposition barium ferrite thin layer, matrix material BEG (porous vitreum surface deposition barium ferrite) to the absorption of electromagnetic wave range of frequency than the barium ferrite broadening, electricity, magnetic loss angle tangent numerical value is bigger, can produce effectively the hertzian wave of corresponding frequencies to absorb.
Compare with Fig. 1 ordinary sinter barium ferrite, Fig. 2 porous vitreum surface deposition barium ferrite (BEG) testing data shows: BEG has more loss tangent peak values in scope of experiment, and numerical value is greater than barium ferrite, and when frequency was 4755MHZ, maximum value appearred in the magnetic loss angle tangent value.Hertzian wave is produced strong absorption.Known loss angle tangent is big more, and material is strong more to electromagnetic extent of deterioration, so BEG is stronger to the absorption of electromagnetic wave effect, inhales ripple frequency range broadening.
Claims (6)
1, a kind of composite wave-suction material is characterized in that: be surrounded by barium ferrite film at sintered glass phase microparticle surfaces, sintered glass phase and barium ferrite mass ratio are 0.1～10: 1.
2, a kind of composite wave-suction material according to claim 1 is characterized in that: the main chemical constitution of described sintered glass phase is SiO
2, Al
2O
3, CaO, MaO.
3, a kind of composite wave-suction material according to claim 1 and 2, its preparation technology is as follows:
A, the preparation Citrate trianion aqueous solution are with Fe
3+, Ba
2+Be complexed to and have on the multi-functional citric acid molecule;
B, add sintered glass phase particulate in the solution that makes, splash into ammoniacal liquor and regulate pH value, solution places stirred in water bath to colloidal, and the colloidal sol drying with prepared obtains desiccant gel.
C, the gained gel is placed retort furnace internal heating, at high temperature Fe
3+, Ba
2With O
2Solid state reaction takes place, and generates barium ferrite (BaO6Fe at sintered glass phase microparticle surfaces
2O
3) film.
4, the preparation technology of a kind of composite wave-suction material according to claim 3 is characterized in that: the mass ratio of three kinds of compounds is in the described A step: Ba (NO
3)
2: Fe (NO
3)
3: citric acid=1: 1～20: 1～30.
5, the preparation technology of a kind of composite wave-suction material according to claim 3 is characterized in that: colloidal sol is dry in the described B step adopts a kind of in vacuum-drying, cryodrying or the heat drying.
6, the preparation technology of a kind of composite wave-suction material according to claim 3 is characterized in that: the temperature rise rate of gel when the retort furnace internal heating is 30～150 ℃/h in the described C step, when being warming up to 600～1300 ℃, and insulation 1～5h.
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|---|---|---|---|
| CN 200410099155 CN1644546A (en) | 2004-12-28 | 2004-12-28 | Composite wave absorbing material and production thereof |
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|---|---|---|---|
| CN 200410099155 CN1644546A (en) | 2004-12-28 | 2004-12-28 | Composite wave absorbing material and production thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104129923A (en) * | 2013-05-05 | 2014-11-05 | 欧阳炜昊 | Preparation method of ferrite wave-absorbing membrane for preventing electromagnetic radiation of electrodeless lamp |
| CN104557095A (en) * | 2014-11-28 | 2015-04-29 | 中国建筑材料科学研究总院 | Glass fiber based composite absorbing material and preparation method thereof |
-
2004
- 2004-12-28 CN CN 200410099155 patent/CN1644546A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104129923A (en) * | 2013-05-05 | 2014-11-05 | 欧阳炜昊 | Preparation method of ferrite wave-absorbing membrane for preventing electromagnetic radiation of electrodeless lamp |
| CN104129923B (en) * | 2013-05-05 | 2016-09-14 | 欧阳炜昊 | The ferrite of a kind of anti-Non-polarized lamp electromagnetic radiation inhales the preparation method of ripple film |
| CN104557095A (en) * | 2014-11-28 | 2015-04-29 | 中国建筑材料科学研究总院 | Glass fiber based composite absorbing material and preparation method thereof |
| CN104557095B (en) * | 2014-11-28 | 2016-06-29 | 中国建筑材料科学研究总院 | A kind of glass fibre base composite wave-absorbing material and preparation method thereof |
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