CN102660221A - Graphite-doped poly-Schiff base/carbonyl iron powder composite stealth material - Google Patents
Graphite-doped poly-Schiff base/carbonyl iron powder composite stealth material Download PDFInfo
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- CN102660221A CN102660221A CN2012101514569A CN201210151456A CN102660221A CN 102660221 A CN102660221 A CN 102660221A CN 2012101514569 A CN2012101514569 A CN 2012101514569A CN 201210151456 A CN201210151456 A CN 201210151456A CN 102660221 A CN102660221 A CN 102660221A
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Abstract
The invention discloses a graphite-doped poly-Schiff base/carbonyl iron powder composite stealth material which is prepared by compounding graphite, poly-Schiff base and carbonyl iron powder. The graphite accounts for 12-19% of the whole composite material by mass, the poly-Schiff base accounts for 18-25% of the whole composite material by mass, and the balance is the carbonyl iron powder. The material has the advantages of excellent wave absorption performance, relatively wide absorption band, low cost and low density, is easy to prepare and has relatively high practical values when being used as an electromagnetic wave absorption material.
Description
Technical field
The present invention relates to a kind of electromagnetic wave absorbent material, particularly relate to a kind of graphite dopping and gather Schiff's base/carbonyl iron dust composite stealthy material.
Background technology
Absorbing material is meant and can absorbs the electromagnetic wave energy that projects its surface, and the dielectric loss through material makes electromagnetic wave energy be converted into one type of material of the energy of heat energy or other form, the high absorption of absorbing material general requirement, bandwidth, light weight and characteristics such as structure properties is stable under employed environment, and absorbing material commonly used mainly contains: carbonyl iron dust; Metal fine powder, semiconductor material, conduction high polymer; Carbon black, polycrystalline iron fiber etc., at present; Traditional both at home and abroad invisible coating is still to be absorbed as major objective by force, and it is to be solved to exist a large amount of outstanding problems to have, and narrower absorption frequency range can't resist the comprehensive scouting of wideband section radar wave; Wave absorbing efficiency is low, and shallow layer does not reach inhales the ripple requirement, and thick layer significantly increases system weight; Influence the maneuvering ability of system, and coating and high base strength deficiency, be prone to come off.Publication number is CN 1206204A; The Chinese patent file of a kind of new electromagnetic wave absorbing material by name and method of manufacture thereof; The electromagnetic wave absorbent material of processing through handled with ferrite magnetic material and zinc, cobalt, copper etc. is disclosed; This material has strong microwave absorbing property at 600 mepses to 5000 mepses, and is said as this document, and this material is only better at the low-frequency range absorbing property; Publication number is CN101853727 A; The Chinese patent file of a kind of iron-graphite composite electromagnetic absorption material by name and preparation method thereof discloses a kind of iron-graphite composite electromagnetic absorption material, and its characteristics are that the outside that is wrapped in iron nano-particle with nano level C forms the C film; This material has stronger absorption of electromagnetic wave in low-frequency range; But its deficiency is also more obvious, mainly is that thickness is bigger, and frequency range is narrower and density is big.Pertinent literature is not reported about the research that gathers the Schiff bases composite wave-suction material.
Summary of the invention
The present invention is directed to the deficiency that existing electromagnetic wave absorbent material exists, provide a kind of graphite dopping to gather Schiff's base/carbonyl iron dust composite stealthy material and its preparation method, preparation product graphite dopping of the present invention gathers Schiff's base/carbonyl iron dust composite stealthy material, and to have an absorbing property strong; Absorption band is wide, and the light weight layer is thin, stable performance; Corrosion-resistant and high-temperature resistant; With low cost, prepare simple advantage, wherein inhaling the ripple bandwidth is its biggest advantage.
Technical scheme of the present invention:
1, to gather Schiff's base/carbonyl iron dust composite stealthy material be to gather Schiff's base and carbonyl iron dust by graphite dopping to mix and obtain to a kind of graphite dopping, and the quality ratio of components is: graphite 12%-19%, gather Schiff's base 18%-25%, and surplus is a carbonyl iron dust.
2, graphite dopping gather the preparation of Schiff's base be with graphite add Ursol D and oxalic dialdehyde in the ethanolic soln, phenylenediamine and oxalic dialdehyde mol ratio be 1:1.At 25 ℃～50 ℃ following induction stirring reaction 8-10h.Products therefrom 300 ℃ of following sintering 2～3 hours, obtains graphite dopping and gathers Schiff's base after filtration, washing with alcohol, drying treatment.
3, the used graphite granule granularity 1-3um of doping, purity is greater than 98.5%.
4, graphite dopping gathers Schiff's base/required carbonyl iron dust of carbonyl iron dust composite stealthy material, and its median size is less than 3.5um, and Fe content is greater than 97% carbonyl iron dust.
It is better that the graphite dopping of the present invention preparation gathers Schiff's base/carbonyl iron dust composite stealthy material wave-absorbing effect, and through the ratio of each component in the adjustment material, can be implemented in the scope of 8-12GHz has-the above reflectivity of 8dB the absorption band broad; And coat-thickness is thinner at 2-3mm; Surpass 1/3 composition in the material for gathering Schiff's base and graphite, so whole density of material is little, light weight; The preparation cost of this material is cheap simultaneously, and the preparation process is simple.This shows that this composite stealthy material has important practical value.
Description of drawings
Fig. 1: process flow sheet of the present invention;
Fig. 2: embodiment 1 reflectance test is figure as a result;
Fig. 3: embodiment 2 reflectance tests are figure as a result;
Fig. 4: embodiment 3 reflectance tests are figure as a result.
Embodiment
In conjunction with content of the present invention following three embodiment are provided:
Embodiment one:
Get 0.2mol Ursol D and 0.2mol oxalic dialdehyde and be dissolved in the 300ml ethanolic soln, add 29.6g graphite again, at 50 ℃ of following induction stirring reaction 8h.The products therefrom filtration under diminished pressure, with alcohol flushing 2～3 times, with after the above-mentioned product drying 300 ℃ of following sintering 2～3 hours, obtain graphite dopping and gather Schiff's base; Get above-mentioned 24g graphite dopping and gather Schiff's base and 42.7g carbonyl iron dust and mix and promptly obtain graphite dopping and gather Schiff's base/carbonyl iron dust composite stealthy material, wherein the median size of carbonyl iron dust is less than 3.5um.The matrix material component is a graphite: 18%, gather Schiff's base: and 18%, all the other are carbonyl iron dust.This absorbing material powder and paraffin blend are prepared mixture, and it is 50% that powder particle accounts for whole mixture weight percent, and all the other are paraffin.This mixture is coated on the standard aluminium sheet of 18cm*18cm*2mm; Thickness is 2mm; According to national military standard GJB2038-94 " radar absorbing reflectance test method " its reflectivity is tested; This material has in the 8.6-12.2GHz scope-reflectivity more than the 8dB, and maximum absorption is-16.7dB that the reflectance test result of this material is illustrated in fig. 2 shown below.
Embodiment two:
Get 0.2mol Ursol D and 0.2mol oxalic dialdehyde and be dissolved in the 300ml ethanolic soln, add 19.7g graphite again, under induction stirring, react 8h-10h, at 50 ℃ of following induction stirring reaction 9h.The products therefrom filtration under diminished pressure, with alcohol flushing 2～3 times, with after the above-mentioned product drying 300 ℃ of following sintering 2～3 hours, obtain graphite dopping and gather Schiff's base; Get above-mentioned 24g graphite dopping and gather Schiff's base and 56g carbonyl iron dust and mix and promptly obtain graphite dopping and gather Schiff's base/carbonyl iron dust composite stealthy material, wherein the median size of carbonyl iron dust is less than 3.5um.The matrix material component is a graphite: 12%, gather Schiff's base: and 18%, all the other are carbonyl iron dust.This absorbing material powder and paraffin blend are prepared mixture, and it is 50% that powder particle accounts for whole mixture weight percent, and all the other are paraffin.This mixture is coated on the standard aluminium sheet of 18cm*18cm*2mm; Thickness is 2mm; According to national military standard GJB2038-94 " radar absorbing reflectance test method " its reflectivity is tested; This material has in the 8.5-11.7GHz scope-reflectivity more than the 8dB, and maximum absorption is-11.7dB that the reflectance test result of this material is illustrated in fig. 4 shown below.
Embodiment three:
Get 0.2mol Ursol D and 0.2mol oxalic dialdehyde and be dissolved in the 300ml ethanolic soln, add 14.2g graphite again, at 50 ℃ of following induction stirring reaction 10h.The products therefrom filtration under diminished pressure, with alcohol flushing 2～3 times, with after the above-mentioned product drying 300 ℃ of following sintering 2～3 hours, obtain graphite dopping and gather Schiff's base; Get above-mentioned 10g graphite dopping and gather Schiff's base and 40.9g carbonyl iron dust and mix and promptly obtain graphite dopping and gather Schiff's base/carbonyl iron dust composite stealthy material, wherein the median size of carbonyl iron dust is less than 3.5um.The matrix material component is a graphite: 12%, gather Schiff's base: and 25%, all the other are carbonyl iron dust.This absorbing material powder and paraffin blend are prepared mixture, and it is 50% that powder particle accounts for whole mixture weight percent, and all the other are paraffin.This mixture is coated on the standard aluminium sheet of 18cm*18cm*2mm; Thickness is 2mm; According to national military standard GJB2038-94 " radar absorbing reflectance test method " its reflectivity is tested; This material has in the 10-12.2GHz scope-reflectivity more than the 8dB, and maximum absorption is-10.8dB that the reflectance test result of this material is illustrated in fig. 3 shown below.
Claims (4)
1. a graphite dopping gathers Schiff's base/carbonyl iron dust composite stealthy material; It is characterized in that: it is to gather Schiff's base and carbonyl iron dust by graphite dopping to mix and obtain that graphite dopping gathers Schiff's base/carbonyl iron dust composite stealthy material; The quality ratio of components is: graphite 12%-19%; Gather Schiff's base 18%-25%, surplus is a carbonyl iron dust.
2. graphite dopping according to claim 1 gathers Schiff's base, and its preparation method is characterised in that: with graphite add Ursol D and oxalic dialdehyde in the ethanolic soln, phenylenediamine and oxalic dialdehyde mol ratio be 1:1; At 25 ℃～50 ℃ following induction stirring reaction 8-10h; Products therefrom 300 ℃ of following sintering 2～3 hours, obtains graphite dopping and gathers Schiff's base after filtration, washing with alcohol, drying treatment.
3. graphite according to claim 2, its characteristic also is: graphite granule granularity 1-3um, purity is greater than 98.5%.
4. carbonyl iron dust according to claim 1 is characterized in that: the median size of carbonyl iron dust is less than 3.5um, and Fe content is greater than 97% carbonyl iron dust.
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| CN201210151456.9A CN102660221B (en) | 2012-05-16 | 2012-05-16 | Graphite-doped poly-Schiff base/carbonyl iron powder composite stealth material |
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| CN102660221B CN102660221B (en) | 2014-01-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103555270A (en) * | 2013-11-07 | 2014-02-05 | 南昌航空大学 | Chiral poly-schiff alkali salt/ferrite wave-adsorbing material and preparation method thereof |
| CN105062091A (en) * | 2015-08-03 | 2015-11-18 | 南昌航空大学 | Ferrocene-based chiral poly Schiff base salt/graphene composite wave-absorbing material |
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- 2012-05-16 CN CN201210151456.9A patent/CN102660221B/en not_active Expired - Fee Related
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103555270A (en) * | 2013-11-07 | 2014-02-05 | 南昌航空大学 | Chiral poly-schiff alkali salt/ferrite wave-adsorbing material and preparation method thereof |
| CN103555270B (en) * | 2013-11-07 | 2015-04-15 | 南昌航空大学 | Chiral poly-schiff alkali salt/ferrite wave-adsorbing material and preparation method thereof |
| CN105062091A (en) * | 2015-08-03 | 2015-11-18 | 南昌航空大学 | Ferrocene-based chiral poly Schiff base salt/graphene composite wave-absorbing material |
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