CN1657585A - Electromagnetic wave absorbing silicon-carbide material coated with barium ferrite film and its preparation process - Google Patents
Electromagnetic wave absorbing silicon-carbide material coated with barium ferrite film and its preparation process Download PDFInfo
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- CN1657585A CN1657585A CN 200410099156 CN200410099156A CN1657585A CN 1657585 A CN1657585 A CN 1657585A CN 200410099156 CN200410099156 CN 200410099156 CN 200410099156 A CN200410099156 A CN 200410099156A CN 1657585 A CN1657585 A CN 1657585A
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- barium ferrite
- electromagnetic wave
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Abstract
An electromagnetic wave absorbing silicon-carbide particle coated by baruim ferrite film is prepared by citrate sol-gel method, that is, proportionally coating the barium ferrite film on the surface of silicon carbide particle. It can be used for wave absorbing coating.
Description
Technical field
The present invention relates to a kind of composite wave-suction material and preparation technology thereof, relate in particular to a kind of electromagnetic wave absorbing silicon-carbide material and preparation technology thereof of coated with barium ferrite film.
Background technology
Electromagnetic radiation is very big to the influence of living environment and Working environment, and environment electromagnetics pollutes and caused people's attention, and many countries have all formulated corresponding electromagnetic radiation safety standard.Along with whole society standard of living improves, people's environmental protection and health care consciousness enhancing 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.
Absorbing material can effectively reduce electromagnetic environment and pollute.The lossy medium of absorbing material is mainly electrical loss type and magnetic loss type.Electrical loss section bar material such as electrically conductive graphite, silicon carbide etc. have higher electrical loss tangent, rely on the electronic polarization of medium or interfacial polarization decay to absorb hertzian wave; Magnetic loss section bar material such as ferrite etc. have higher magnetic loss tangent angle, rely on magnetic polarization mechanism decay such as magnetic hysteresis loss, domain wall resonance and aftereffect loss, absorb hertzian wave.
Ferrite is the absorbing material of the more and comparative maturity of research, and absorbing property is good, and is cheap, is one of main component of absorbing material.By the difference of microtexture, ferrite is divided into the hexaplanar Magnetoplumbate-type, isometric system spinel type and rare earth garnet type.The wave-absorbing effect of hexaplanar barium ferrite is better.When ferrite is used as wave absorbing agent, mainly exist heavy problem, and traditional ferrite coating frequency band is narrow, actual effect is poor.
Silicon carbide is a kind of structured material of excellent performance, characteristics such as hardness height, hot strength is big, creep-resistant property good, resistance to chemical attack, antioxidant property is good, thermal expansivity is little, high thermoconductivity; Have electromagnetic wave absorption, silicon carbide can effectively reduce infrared radiation signal simultaneously, is usually used in infrared stealth.
Summary of the invention
At the deficiency that prior art exists, the electromagnetic wave absorbing silicon-carbide material that one of purpose of the present invention is to provide a kind of effective infrared stealth, enhancing electromagnetic wave absorption ability and makes the coated with barium ferrite film of inhaling ripple frequency range broadening;
Another object of the present invention is to provide the preparation technology of the electromagnetic wave absorbing silicon-carbide material of this coated with barium ferrite film.
The present invention is achieved through the following technical solutions:
A kind of electromagnetic wave absorbing silicon-carbide material of coated with barium ferrite film is surrounded by barium ferrite film on the silicon-carbide particles surface, and silicon carbide and barium ferrite mass ratio are 0.1～10: 1.
Wherein said ferrite particle particle diameter is between 40～200nm, and closely laminar film is formed in gathering.
The electromagnetic wave absorbing silicon-carbide material of this coated with barium ferrite film, 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 silicon-carbide particles 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.
The mass ratio of three kinds of compounds is in the wherein said A step: Ba (NO
3)
2: Fe (NO
3)
3: citric acid=1: 1～20: 1～30.
Colloidal sol is dry in the wherein said B step adopts a kind of in vacuum-drying, cryodrying or the heat drying.
The temperature rise rate of gel when the retort furnace internal heating is 30～150 ℃/h in the wherein said C step, when being warming up to 600～1300 ℃, and insulation 1～5h.
Silicon carbide is a kind of structured material of excellent performance, can weaken infrared radiation signal effectively, is usually used in infrared stealth, also has absorbing property, and electromagnetic energy mainly decays on resistance; Ferrite belongs to magneticmedium type absorbing material, has higher magnetic loss angle tangent, relies on magnetic polarization mechanism decay such as magnetic hysteresis loss, domain wall resonance and natural resonance, aftereffect loss, absorbs hertzian wave.Behind the silicon carbide deposition barium ferrite thin layer, matrix material (BESiC) combines the characteristics of silicon carbide and barium ferrite, on original good electrical loss performance basis, increase the magnetic loss performance, after silicon carbide deposits the barium ferrite thin layer simultaneously, thereby hertzian wave may produce the decay of interference generate energy between surface and bottom differing materials interface.Matrix material can reach effective infrared stealth; Strengthen the electromagnetic wave absorption ability and make and inhale ripple frequency range broadening.Be widely used in various civil electric appliances and electronic equipment casing as microwave absorbing coating, also can be used as the admixture of building coating and mortar, be coated on residential quarters electric substation construction wall top layer to reduce the high-power electric appliance electromagenetic wave radiation, the guarantee resident's is healthy.
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 BESiC magnetic loss angle tangent of the present invention and frequency.
Fig. 2 B is the graph of relation of BESiC electrical loss angle tangent of the present invention and frequency.
Embodiment
How further specify the present invention below in conjunction with specific embodiment realizes:
Embodiment 1
Adopt citric acid complex iron nitrate, nitrate of baryta to make presoma.By stoichiometric ratio Ba (NO
3)
2: Fe (NO
3)
3: citric acid=1: 12: 19 preparation solution.In solution, add silicon carbide.The theoretical product quality ratio of silicon carbide 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.Heat temperature raising speed: 60 ℃/h, when being warming up to 850 ℃, insulation 1h.
Embodiment 2
Adopt citric acid complex iron nitrate, nitrate of baryta to make presoma.By stoichiometric ratio Ba (NO
3)
2: Fe (NO
3)
3: citric acid=1: 12: 13 preparation solution.In solution, add silicon carbide.The theoretical product quality ratio of silicon carbide and ferrite is 2: 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 5h, obtains desiccant gel.The gained gel is placed the retort furnace internal heating.Heat temperature raising speed: 30 ℃/h, when being warming up to 750 ℃, insulation 3h.
Embodiment 3
Adopt citric acid complex iron nitrate, nitrate of baryta to make presoma.By stoichiometric ratio Ba (NO
3)
2: Fe (NO
3)
3: citric acid=1: 12: 15 preparation solution.In solution, add silicon carbide.The theoretical product quality ratio of silicon carbide and ferrite is 1: 1.5.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 5h, obtains desiccant gel.The gained gel is placed the retort furnace internal heating.Heat temperature raising speed: 100 ℃/h, when being warming up to 800 ℃, insulation 2h.
Embodiment 4
Adopt citric acid complex iron nitrate, nitrate of baryta to make presoma.By stoichiometric ratio Ba (NO
3)
2: Fe (NO
3)
3: citric acid=1: 12: 13 preparation solution.In solution, add silicon carbide.The theoretical product quality ratio of silicon carbide and ferrite is 1.5: 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 5h, obtains desiccant gel.The gained gel is placed the retort furnace internal heating.Heat temperature raising speed: 150 ℃/h, when being warming up to 900 ℃, insulation 1h.
Compare with the ordinary sinter barium ferrite of Figure 1A and Figure 1B, the silicon carbide of Fig. 2 A and Fig. 2 B deposition barium ferrite (BESiC) testing data shows: BESiC in 0.1～6GHz scope internal loss tangent peak value of experiment significantly greater than barium ferrite, known loss angle tangent is big more, material is strong more to electromagnetic extent of deterioration, so BEG is stronger to the absorption of electromagnetic wave effect.
Claims (6)
1, a kind of electromagnetic wave absorbing silicon-carbide material of coated with barium ferrite film is characterized in that: be surrounded by barium ferrite film on the silicon-carbide particles surface, silicon carbide and barium ferrite mass ratio are 0.1～10: 1.
2, the electromagnetic wave absorbing silicon-carbide material of a kind of coated with barium ferrite film according to claim 1 is characterized in that: described ferrite particle particle diameter is between 40～200nm, and closely laminar film is formed in gathering.
3, the electromagnetic wave absorbing silicon-carbide material of a kind of coated with barium ferrite film 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 silicon-carbide particles 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 the electromagnetic wave absorbing silicon-carbide material of a kind of coated with barium ferrite film 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 the electromagnetic wave absorbing silicon-carbide material of a kind of coated with barium ferrite film 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 the electromagnetic wave absorbing silicon-carbide material of a kind of coated with barium ferrite film according to claim 3, it 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 ℃, insulation 1～5h.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100366340C (en) * | 2005-10-14 | 2008-02-06 | 济南大学 | Catalyst for degrading water organic pollutant by microwave |
| CN101683020B (en) * | 2007-04-11 | 2012-04-18 | 户田工业株式会社 | Sheet for prevention of electromagnetic wave interference and method for production thereof |
| CN102701797A (en) * | 2012-01-31 | 2012-10-03 | 鸿康磁业电子（昆山）有限公司 | Ferrite coating of porous ceramic |
| CN110517723A (en) * | 2019-08-30 | 2019-11-29 | 山东中瑞电子股份有限公司 | The preparation method of high magnetic permeability GHz wave band absorbing material |
| CN111099888A (en) * | 2019-12-31 | 2020-05-05 | 天长市中德电子有限公司 | Preparation method of wave-absorbing ferrite |
| CN116217126A (en) * | 2022-12-19 | 2023-06-06 | 奇遇新材料科技(佛山)有限公司 | Multi-absorption-band wave-absorbing film and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1163437C (en) * | 2000-10-27 | 2004-08-25 | 中国科学院上海硅酸盐研究所 | Reticular microwave-absorbing body ceramic and its producing method |
| JP3608612B2 (en) * | 2001-03-21 | 2005-01-12 | 信越化学工業株式会社 | Electromagnetic wave absorbing heat conducting composition, heat softening electromagnetic wave absorbing heat radiation sheet, and heat radiation construction method |
| CN1314503C (en) * | 2002-09-29 | 2007-05-09 | 武汉大学 | Electromagnetic wave absorbing material containing carbon covered metal or metal compound and its application |
| CN1218435C (en) * | 2002-12-27 | 2005-09-07 | 磐石制路波株式会社 | Electromagnetic wave absorbing body |
-
2004
- 2004-12-28 CN CNB2004100991566A patent/CN100445342C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100366340C (en) * | 2005-10-14 | 2008-02-06 | 济南大学 | Catalyst for degrading water organic pollutant by microwave |
| CN101683020B (en) * | 2007-04-11 | 2012-04-18 | 户田工业株式会社 | Sheet for prevention of electromagnetic wave interference and method for production thereof |
| CN102701797A (en) * | 2012-01-31 | 2012-10-03 | 鸿康磁业电子（昆山）有限公司 | Ferrite coating of porous ceramic |
| CN110517723A (en) * | 2019-08-30 | 2019-11-29 | 山东中瑞电子股份有限公司 | The preparation method of high magnetic permeability GHz wave band absorbing material |
| CN110517723B (en) * | 2019-08-30 | 2022-04-01 | 山东中瑞电子股份有限公司 | Preparation method of high-permeability GHz-band absorbing material |
| CN111099888A (en) * | 2019-12-31 | 2020-05-05 | 天长市中德电子有限公司 | Preparation method of wave-absorbing ferrite |
| CN116217126A (en) * | 2022-12-19 | 2023-06-06 | 奇遇新材料科技(佛山)有限公司 | Multi-absorption-band wave-absorbing film and preparation method thereof |
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|---|---|
| CN100445342C (en) | 2008-12-24 |
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