CN103924113A - Ferrite composite wave-absorption material adopting foam aluminum as substrate - Google Patents
Ferrite composite wave-absorption material adopting foam aluminum as substrate Download PDFInfo
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- CN103924113A CN103924113A CN201410104996.0A CN201410104996A CN103924113A CN 103924113 A CN103924113 A CN 103924113A CN 201410104996 A CN201410104996 A CN 201410104996A CN 103924113 A CN103924113 A CN 103924113A
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Abstract
The present invention relates to a ferrite composite wave-absorption material adopting foam aluminum as a substrate. The ferrite composite wave-absorption material comprises, by mass, 5-15% of a foaming agent, 20-50% of ferrite, 25-40% of aluminum powder, and 10-25% of alumina powder. According to the present invention, 1) the problems of expensive price and harsh operation condition of application of TiH2 as the foaming agent can be solved with the foaming agent of the present invention; 2) with the foaming agent of the present invention, the raw material ratio can be changed to adjust the porosity and the pore size distribution of the foam aluminum so as to adjust the wave-absorption performance of the foam aluminum/ferrite composite material; 3) dolomite can be decomposed to produce a lot of gas, and the selected carbon powder and the silicon powder are adopted as the adjustment agent, such that the foaming performance of the foaming agent is adjusted, and the temperature resistance of the foam aluminum is enhanced; and 4) the foam aluminum/ferrite composite material can meet "thin, light, wide and strong" requirements.
Description
Technical field
The present invention relates to a kind of composite wave-suction material, be specifically related to a kind of ferrite composite wave-suction material that foamed aluminium is matrix of take.
Background technology
Along with popularizing of computer, substation, wireless communication station and sensor new and high technology, absorbing material has entered the stage being widely used.In people's routine work and life, universal electromagnetic radiation and the interference problem of bringing of some electronic and electrical equipments is day by day serious, is causing gradually the public's concern by electromagenetic wave radiation today that the problem being caused is pursued high-quality life people.
Absorbing material can be divided into interfere type and the large class of absorption-type two by principle of work, and wherein absorption-type absorbing material can be divided into again two kinds, magnetic loss type and electrical loss type.Magnetic loss type absorbing material principal feature is to have higher magnetic loss tangent angle, utilize the magnetic polarization mechanism decay electromagnetic wave absorptions such as magnetic hysteresis loss, domain wall resonance and natural resonance, aftereffect loss, mainly comprise ferrite powder, carbonyl iron dust, super-fine metal powder, nano-phase material etc.Electrical loss type absorbing material principal feature is to have higher electrical loss tangent angle, the electronic polarization, ionic polarization, molecular polarization or the interfacial polarization decay electromagnetic wave absorption that rely on medium, mainly comprise conductive carbon black, silicon carbide, metallic staple, conducting polymer etc.
At present, for absorbing material, simple magnetic loss type or electrical loss type can not meet the needs of practical application, and a little less than mostly there is wave-sucking performance while using separately these materials, inhale that ripple frequency band is narrow, quality heavy, non-refractory and the deficiency such as mechanical property is poor.For practical requirement, will on the basis of traditional absorbing material, break through the limitation of original material, actively development of new wave absorbing agent, exploration integrates the composite wave absorption material of magnetic loss and electrical loss, and meets the requirement of electromagnetic interference material " thin, light, wide, strong ".
The ultra-light porous metal that variation hole is feature have been realized the light multifunction of structured material, because it has lightweight, and high specific strength, high-energy absorption, the features such as sound, heat, electromagnetic shielding and multi-functional compatibility thereof, are just becoming one of current study hotspot.
Foamed aluminium is a kind of new function material, and it is the similar foamed ultralight metallic substance of countless bubbles of being scattered here and there in metallic aluminium matrix, and general porosity is 40%～98%.
At present the foamed aluminium preparation technology of tool commercial value is foam melt method, can production large size and have a closed-cell aluminum foam of regular pore space structure.But the report that up to the present, rarely has large specification closed-cell foam aluminum products commercial applications.The problem existing is mainly manifested in: (1) traditional technology mostly adopts TiH
2deng as whipping agent and calcium metal as tackifier, TiH
2the fast feature of class whipping agent decomposition rate makes this method operational condition harsh, and yield rate is low; (2) expensive TiH
2the use of class whipping agent and calcium metal, has also further improved the manufacturing cost of closed-cell aluminum foam.Therefore, develop alternative TiH
2the type material of class whipping agent is significant.
Patent CN 102002300B discloses a kind of preparation method of foam aluminium alloy wave-absorbing material, the method comprises the surface preparation of foam aluminium alloy matrix, the preparation of antiradar coatings and spraying, wherein polyaniline is wave absorbing agent, and the rare earth element of doping has further improved the absorbing property of polyaniline.Meanwhile, the vesicular structure of foamed aluminium, makes hertzian wave multiple reflections, scattering and interference, increases its power loss.
Summary of the invention
The object of the invention is to a kind of ferrite composite wave-suction material that foamed aluminium is matrix of take.
The technical scheme that realizes the object of the invention is: a kind ofly take the ferrite composite wave-suction material that foamed aluminium is matrix, by mass percentage, by whipping agent 5%～15%, ferrite 20%～50%, aluminium powder 25%～40%, aluminum oxide powder 10%～25%.
Whipping agent of the present invention, represents by mass percentage, rhombspar 32%～52%, calcium carbonate 25%～35%, calcium sulfate 5%～10%, carbon dust 10%～18% and silica flour 5%～10%, consists of.
Ferrite of the present invention is nickel-zinc ferrite, and particle diameter is 3～5 μ m.
The component of nickel-zinc ferrite of the present invention and the weight ratio of content are: Fe
2o
340～60%, NiO 10～30%, ZnO 20～40%, all the other are additive.
Additive of the present invention is BaO or Bi
2o
3.
Of the present inventionly take the ferrite composite wave-suction material that foamed aluminium is matrix, this absorbing material is made by following steps:
1) batch mixing: example, by whipping agent, deionized water and dispersion agent, obtains powder with vibromill mixing after 0.5～3 hour in mass ratio;
2) sand milling: above-mentioned powder is put into sand mill, add ferrite, aluminium powder, aluminum oxide powder simultaneously, sand milling obtains slurry for 0.5～3 hour;
3) moulding: the slurry after above-mentioned sand milling is carried out to moulding and obtain green compact;
4) foaming: after green compact are dry, at 600～800 ℃ of constant temperature, insulation 5～10min, naturally cooling in air, obtains foamed aluminium/ferrite composite wave-suction material.
Further, in step 1), the mass percent of described whipping agent, deionized water and dispersion agent is 1:(10～50): (0.2～0.5).
Further, described whipping agent, represents by mass percentage, rhombspar 32%～52%, calcium carbonate 25%～35%, calcium sulfate 5%～10%, carbon dust 10%～18% and silica flour 5%～10%, consists of.
Further, described dispersion agent is polyvinyl alcohol or methylcellulose gum.
Further, step 2) in, the mass percent of described ferrite, aluminium powder and aluminum oxide powder is 1:(0.5～2): (0.2～1.25), described ferrite and the mass percent of whipping agent are (2～10): 1.
Compared with prior art, the advantage having is in the present invention: 1) whipping agent of the present invention can solve TiH
2as whipping agent, there is the problem expensive, operational condition is harsh.2) whipping agent of the present invention can regulate by feed change proportioning porosity and the pore size distribution of foamed aluminium, thereby regulates the absorbing property of foamed aluminium/ferrite composite material.3) rhombspar in the present invention, can decomposite a large amount of gas, and the carbon dust of selecting, silica flour, as conditioning agent, not only regulate the foam performance of whipping agent, and has strengthened the heat resistance of foamed aluminium.4) foamed aluminium/ferrite composite material of the present invention, can meet the requirement of " thin, light, wide, strong ".
Embodiment
Below in conjunction with embodiment, the present invention is described further, but the invention is not restricted to these embodiment.
embodiment 1
1) batch mixing: take 100 grams of whipping agents (composition: 32 grams of rhombspars, 35 grams, calcium carbonate, 10 grams, calcium sulfate, 13 grams of carbon dusts, 10 grams of silica flours), 1 kilogram of deionized water and 20 grams of polyvinyl alcohol, obtain powder with vibromill mixing after 0.5 hour;
2) sand milling: above-mentioned powder is put into sand mill, add 200 grams of nickel-zinc ferrite (composition Fe simultaneously
2o
380 grams, 20 grams of NiO, 80 grams of ZnO, 20 grams of BaO, particle diameter is 3 μ m), 100 grams of aluminium powders, 40 grams of aluminum oxide powders, sand milling 0.5 hour slurry;
3) moulding: the slurry after above-mentioned sand milling is carried out to moulding and obtain green compact;
4) foaming: after green compact are dry, at 600 ℃ of constant temperature, insulation 5min, naturally cooling in air, obtains foamed aluminium/ferrite composite wave-suction material.
embodiment 2
1) batch mixing: take 100 grams of whipping agents (composition: 52 grams of rhombspars, 25 grams, calcium carbonate, 5 grams, calcium sulfate, 10 grams of carbon dusts, 8 grams of silica flours), 5 kilograms of deionized waters and 50 grams of polyvinyl alcohol, obtain powder with vibromill mixing after 0.5 hour;
2) sand milling: above-mentioned powder is put into sand mill, add 1 kilogram of nickel-zinc ferrite (composition Fe simultaneously
2o
3600 grams, 100 grams of Ni, 200 grams of ZnO, 100 grams of BaO, particle diameter is 5 μ m), 2 kilograms of aluminium powders, 1.25 kg of alumina powder, sand milling 3 hours slurry;
3) moulding: the slurry after above-mentioned sand milling is carried out to moulding and obtain green compact;
4) foaming: after green compact are dry, at 800 ℃ of constant temperature, insulation 10min, naturally cooling in air, obtains foamed aluminium/ferrite composite wave-suction material.
embodiment 3
1) batch mixing: take 100 grams of whipping agents (composition: 40 grams of rhombspars, 30 grams, calcium carbonate, 6 grams, calcium sulfate, 18 grams of carbon dusts, 6 grams of silica flours), 3 kilograms of deionized waters and 30 grams of methylcellulose gum, obtain powder with vibromill mixing after 0.5 hour;
2) sand milling: above-mentioned powder is put into sand mill, add 500 grams of nickel-zinc ferrite (composition Fe simultaneously
2o
3225 grams, 150 grams of NiO, 100 grams of ZnO, 25 grams of BaO, particle diameter is 3 μ m), 700 grams of aluminium powders, 300 grams of aluminum oxide powders, sand milling 2 hours slurry;
3) moulding: the slurry after above-mentioned sand milling is carried out to moulding and obtain green compact;
4) foaming: after green compact are dry, at 650 ℃ of constant temperature, insulation 5min, naturally cooling in air, obtains foamed aluminium/ferrite composite wave-suction material.
The present invention is not limited to above embodiment; embodiment 1～3 is only used to principle of the present invention is described and the illustrative embodiments that adopts; yet for those skilled in the art; do not departing under real situation of the present invention; can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (10)
1. the ferrite composite wave-suction material that the foamed aluminium of take is matrix, is characterized in that: by mass percentage, whipping agent 5%～15%, ferrite 20%～50%, aluminium powder 25%～40%, aluminum oxide powder 10%～25%, consist of.
2. a kind of ferrite composite wave-suction material that foamed aluminium is matrix of take according to claim 1, it is characterized in that: described whipping agent, represent by mass percentage, by rhombspar 32%～52%, calcium carbonate 25%～35%, calcium sulfate 5%～10%, carbon dust 10%～18% and silica flour 5%～10%, formed.
3. a kind of ferrite composite wave-suction material that foamed aluminium is matrix of take according to claim 1, is characterized in that: described ferrite is nickel-zinc ferrite, and particle diameter is 3～5 μ m.
4. a kind of ferrite composite wave-suction material that foamed aluminium is matrix of take according to claim 1, is characterized in that: the component of described nickel-zinc ferrite and the weight ratio of content are: Fe
2o
340～60%, NiO 10～30%, ZnO 20～40%, all the other are additive.
5. a kind of ferrite composite wave-suction material that foamed aluminium is matrix of take according to claim 4, is characterized in that: described additive is BaO or Bi
2o
3.
6. a kind of ferrite composite wave-suction material that foamed aluminium is matrix of take according to claim 1, is characterized in that: this absorbing material is made by following steps:
1) batch mixing: example, by whipping agent, deionized water and dispersion agent, obtains powder with vibromill mixing after 0.5～3 hour in mass ratio;
2) sand milling: above-mentioned powder is put into sand mill, add ferrite, aluminium powder, aluminum oxide powder simultaneously, sand milling obtains slurry for 0.5～3 hour;
3) moulding: the slurry after above-mentioned sand milling is carried out to moulding and obtain green compact;
4) foaming: after green compact are dry, at 600～800 ℃ of constant temperature, insulation 5～10min, naturally cooling in air, obtains foamed aluminium/ferrite composite wave-suction material.
7. a kind of ferrite composite wave-suction material that foamed aluminium is matrix of take according to claim 6, is characterized in that: in step 1), the mass ratio of described whipping agent, deionized water and dispersion agent is 1:(10～50): (0.2～0.5).
8. a kind of ferrite composite wave-suction material that foamed aluminium is matrix of take according to claim 6, it is characterized in that: described whipping agent, represent by mass percentage, by rhombspar 32%～52%, calcium carbonate 25%～35%, calcium sulfate 5%～10%, carbon dust 10%～18% and silica flour 5%～10%, formed.
9. according to a kind of described in claim 6 or 7, take the ferrite composite wave-suction material that foamed aluminium is matrix, it is characterized in that: described dispersion agent is polyvinyl alcohol or methylcellulose gum.
10. a kind of ferrite composite wave-suction material that foamed aluminium is matrix of take according to claim 6, it is characterized in that: step 2) in, the mass percent of described ferrite, aluminium powder and aluminum oxide powder is 1:(0.5～2): (0.2～1.25), described ferrite and the mass percent of whipping agent are (2～10): 1.
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| CN201410104996.0A CN103924113B (en) | 2014-03-21 | 2014-03-21 | A kind of take foamed aluminium as the ferrite composite wave-suction material of matrix |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104164582A (en) * | 2014-09-04 | 2014-11-26 | 丹阳市国美汽配有限公司 | Foaming agent for foamed aluminum materials and preparation technique thereof |
| CN104478473A (en) * | 2014-12-23 | 2015-04-01 | 南京理工大学常熟研究院有限公司 | Foamed ceramic wave-absorbing material |
| CN104478337A (en) * | 2014-12-17 | 2015-04-01 | 南京理工大学常熟研究院有限公司 | Foamed aluminum material |
| CN107434371A (en) * | 2016-05-25 | 2017-12-05 | 北新集团建材股份有限公司 | A kind of mineral wool sound absorption board of anti-electromagnetic radiation and preparation method thereof |
| CN112549687A (en) * | 2020-11-19 | 2021-03-26 | 贵州航天建设工程有限公司 | Modified polyimide-based wave-absorbing material for microwave anechoic chamber, wave-absorbing structure and preparation method of wave-absorbing structure |
| CN114438364A (en) * | 2022-03-09 | 2022-05-06 | 辽宁融达新材料科技有限公司 | Preparation method of foamed aluminum wave-absorbing material and special air cooling and spraying device |
| CN114619724A (en) * | 2020-12-10 | 2022-06-14 | 南京航空航天大学 | High-temperature-resistant structure wave-absorbing composite material and preparation method thereof |
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| CN101259463A (en) * | 2008-04-30 | 2008-09-10 | 东北大学 | Preparation of foam aluminum alloy base wave-absorbing material |
| CN101899221A (en) * | 2010-07-02 | 2010-12-01 | 李勇 | Foaming type electromagnetic wave absorption composite material and preparation method thereof |
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| JPS6220846A (en) * | 1985-07-19 | 1987-01-29 | Agency Of Ind Science & Technol | Manufacture of foamed metal |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104164582A (en) * | 2014-09-04 | 2014-11-26 | 丹阳市国美汽配有限公司 | Foaming agent for foamed aluminum materials and preparation technique thereof |
| CN104478337A (en) * | 2014-12-17 | 2015-04-01 | 南京理工大学常熟研究院有限公司 | Foamed aluminum material |
| CN104478473A (en) * | 2014-12-23 | 2015-04-01 | 南京理工大学常熟研究院有限公司 | Foamed ceramic wave-absorbing material |
| CN107434371A (en) * | 2016-05-25 | 2017-12-05 | 北新集团建材股份有限公司 | A kind of mineral wool sound absorption board of anti-electromagnetic radiation and preparation method thereof |
| CN112549687A (en) * | 2020-11-19 | 2021-03-26 | 贵州航天建设工程有限公司 | Modified polyimide-based wave-absorbing material for microwave anechoic chamber, wave-absorbing structure and preparation method of wave-absorbing structure |
| CN112549687B (en) * | 2020-11-19 | 2021-07-23 | 贵州航天建设工程有限公司 | Modified polyimide-based wave-absorbing material for microwave anechoic chamber, wave-absorbing structure and preparation method of wave-absorbing structure |
| CN114619724A (en) * | 2020-12-10 | 2022-06-14 | 南京航空航天大学 | High-temperature-resistant structure wave-absorbing composite material and preparation method thereof |
| CN114438364A (en) * | 2022-03-09 | 2022-05-06 | 辽宁融达新材料科技有限公司 | Preparation method of foamed aluminum wave-absorbing material and special air cooling and spraying device |
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| CN103924113B (en) | 2016-02-10 |
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Effective date of registration: 20191108 Address after: Magi Road, Changshu high tech Industrial Development Zone, Suzhou City, Jiangsu Province, No. 1 215500 Patentee after: Suzhou Hui Xin bang Mstar Technology Ltd Address before: 215400 Suzhou City, Taicang Province Economic Development Zone, Beijing West Road, No. 1, building 6, No. Patentee before: Suzhou Yuxi New Material Technology Co., Ltd. |
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Effective date of registration: 20191129 Address after: 215400 Suzhou City, Taicang Province Economic Development Zone, Beijing West Road, No. 1, building 6, No. Patentee after: Suzhou Yuxi New Material Technology Co., Ltd. Address before: Magi Road, Changshu high tech Industrial Development Zone, Suzhou City, Jiangsu Province, No. 1 215500 Patentee before: Suzhou Hui Xin bang Mstar Technology Ltd |