CN102358806A - Radar wave absorption absorbing coating and preparation method thereof - Google Patents
Radar wave absorption absorbing coating and preparation method thereof Download PDFInfo
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- CN102358806A CN102358806A CN2011102500291A CN201110250029A CN102358806A CN 102358806 A CN102358806 A CN 102358806A CN 2011102500291 A CN2011102500291 A CN 2011102500291A CN 201110250029 A CN201110250029 A CN 201110250029A CN 102358806 A CN102358806 A CN 102358806A
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Abstract
The invention discloses the ratio of raw materials for preparing a radar wave absorption absorbing coating and a preparation method for the same. The radar wave absorption absorbing coating is prepared by 25 to 55 parts of nanometer gadolinium-ferrite, 0.03 part to 2.5 parts of metallic cobalt or manganese, 10 to 35 parts of carbonyl iron and 25 to 75 parts of an adhesive. The nanometer gadolinium-ferrite is prepared by using the methods of citrate sol-gel and high temperature cauterization and mainly comprises ferromagnetic nanometer wafer-like particles, hexaplanar ferrite, amorphous magnetic fibers and a particle film. In utilization, the radar wave absorption absorbing coating provided in the invention has the advantages of a small thickness, a light weight, a wide absorption frequency band and high absorptivity.
Description
Technical field
The present invention relates to a kind of coating, be specifically related to prescription of a kind of coating that can absorbing radar wave and preparation method thereof.
Background technology
Various military equipments realize the technological method of stealthy performance, mainly be profile stealthy with stealthy two kinds of material.Profile stealthy technique difficulty is bigger, makes the structure properties deterioration of target easily, and adopts the stealth material technology simple relatively.The radar wave absorbing coating is simple because of its preparation, easy construction, do not receive many advantages such as workpiece shape limits; Equip stealthy ideal measure and become; Stealthy and the anti-EMI that can be widely used in military aircraft, guided missile, vehicle, Ship Target, and the field such as anti-interference of the anti-electromagnetic pollution of the product for civilian use, gadget.
The prerequisite that the radar wave absorbing coating to be used is not only and will in wide as far as possible frequency band, be had good absorbing property, but also will promptly have the characteristics of " thin, light, wide, strong " with the weightening finish of coating and gauge control in allowed limits.Then also should satisfy mechanical property, physicochemical property, anti-ocean environment property for the radar-wave absorbing coating that uses under the particular surroundings, and on-the-spot be prone to over-all properties requirements such as construction, dependable performance, maintenance be easy, the difficulty of its development is self-evident.
The application of radar wave absorbing coating; Mainly be stealthy to what equip in 30MHz～100GHz radar wave reconnaissance range; Wherein superhigh frequency band (2GHz-18GHz) is very important radar detection wave band, also is the present stage emphasis analyzed of the countries in the world ultrabroad band radar stealth technology of making every effort to break through.The Ferrite Material conduct is comparatively sophisticated absorbing material the earliest, is characterized in that wave absorbing efficiency is higher, but the suction wave frequency is narrower, is the absorbent body agent of making radar-wave absorbing coating at present.With common ferrite is that the existing Radar Stealth Materials of representative exists shortcomings such as frequency band is narrow, efficient is low, density is big, and range of application receives certain limitation, presses for development of new absorbing material and corresponding stealthy technique.
Summary of the invention
The technical problem that the present invention will solve is, a kind of novel radar wave absorbing coating and preparation method thereof is provided, and this coating is used for the stealthy of military equipment, have inhale the ripple bandwidth, efficient is high, coating is frivolous, the characteristics of applied range.
Radar wave absorbing coating of the present invention is by following feedstock production: nano level gadolinium-ferrite, cobalt metal or manganese powder agent, iron carbonyl and tackiness agent.The consumption of each raw material is expressed as by weight: 25～55 parts on nano level gadolinium--ferrite, 0.03～2.5 part in cobalt metal or manganese, 10～35 parts of iron carbonyls, 25～75 parts in tackiness agent.
Wherein, nano level gadolinium-ferrite is to utilize citrate sol, adopts gel method, burns through high temperature, and the organism volatilization makes.Its staple is ferromagnetic nanocrystalline platy particle, plane hexad ferrite, amorphous magnetic fibre and membrana granulosa;
Said cobalt metal or manganese powder agent are meant and adopt a kind of in cobalt or the manganese that its consumption is equal to;
Said tackiness agent is selected for use in can modified polyurethane, modified polyvinyl ester, modified epoxy or the acryhic material of anti--40 ℃～+ 80 ℃ of difference variation any; Tackiness agent can also adopt the epoxyn of the hard and soft cross-linked network structure of AB type.
The preparation method of radar wave absorbing coating of the present invention comprises following process step:
Step 1 prepares nano level gadolinium-ferrite
Get citrate sol and ferrite, mix, burnt 4 hours, get high purity composite Nano level oxide powder through 500 ℃ of high temperature by " citrate sol: ferrite=95: 5 " part by weight proportioning;
This " citrate sol-gel method " is incorporated into the positively charged ion in the system to have on the multi-functional citric acid molecule, reaches the uniform mixing on the atom level.Burn down at high temperature, the organism volatilization gets high purity composite Nano level oxide powder, and its staple is ferromagnetic nanocrystalline platy particle, plane hexad ferrite, amorphous magnetic fibre and membrana granulosa.
Step 2 is mixed nano level gadolinium-ferrite, cobalt metal or manganese powder agent, iron carbonyl in the input impeller, under 600～100r/min condition, stirs 15-30min, obtains mixture;
Step 3 is put into mill with the mixture of step 2 preparation and is ground 15～30min, will assemble agglomerating mixture and grind owing to stirring;
Step 4 together drops into the mixture and the tackiness agent of step 3 preparation in the impeller, under 600～100r/min condition, stirs 15-30min, leaves standstill 3～5min, promptly makes radar wave absorbing coating of the present invention.
Radar wave absorbing coating preparation method of the present invention is based on the physical mechanism of magnetic exchange coupling, natural resonance, shape anisotropy and eddy-current loss; Adopt the principle of design and the morphology control technology of the function solenoid filler of lightweight, high microwave magnetic permeability and controlled specific inductivity, made the magnetic dielectric wave absorbing agent of several high performance such as ferromagnetic nanocrystalline platy particle, plane hexad ferrite, amorphous magnetic fibre and membrana granulosa.Ferrite wave-absorbing material combines the preparation microwave absorbing coating with basic phase material, be bonded in stealthy facility surface.The basic phase material of being selected for use should be good with the absorbing material compatibility, adapts with the thermal expansivity of base material, and cohesive force is good.
Radar wave absorbing coating of the present invention admixture gadolinium-ferrite nano material in basic phase material is formed suction ripple-impedance transform layer; Doping metals powder and iron carbonyl modification gadolinium-ferrite nano material is formed suction ripple-low resistance resonant layer to form the interface microwave absorbing coating.Utilize hertzian wave multiple reflection mechanism on the different media interface, make incident electromagnetic wave repeatedly incident and reflection on inner each interface of absorbing material, improve assimilated efficiency.Its effective suction wave frequency scope of different Ferrite Materials is different.The present invention adopts cobalt or manganese metal, iron carbonyl doping vario-property gadolinium--ferrite prepares nano level wave-absorbing powder material, combines the preparation antiradar coatings again with basic phase material through modification, widens the wave frequency scope of inhaling greatly.
The present invention adopts gadolinium--ferrite composite wave-absorbing nano-powder material is according to gadolinium--, and element electronic orbit characteristic that the ferrite complex body forms designs, and can reduce its proportion greatly, changes physicalies such as its magnetic, electrical, optical.After the ferrite paricles particle size reduced, under the hertzian wave effect, electronics is made rapid cyclic motion in the more particulate magnetic domain increased magnetic domain consumption, makes electromagnetic energy sharply decay, thereby improves ferritic absorbing property.
Current developed with common ferrite be the absorbing material workplace of representative in the 8-18GHz range of frequency, the full frequency band specific absorption is 10dB, area density is 5kg/m
2, thickness is 2mm.Radar wave absorbing coating working range of the present invention covers the 30MHz-100GHz frequency; The technical indicator that reaches after the application is: thickness: 0.3～0.4mm; Reflectivity R:-20dB; Area density: 1.2～5.5kg/m
2Suppleness :≤10mm; Resistance to impact shock: 50kgcm; Sticking power is greater than 23Mpa; Resistance to medium is good.
Embodiment
Below through embodiment the present invention is described further.
Embodiment 1 preparation citrate sol
Citrate sol has commercially available article.Its preparation; Be from the citric acid complex solution that contains Ba, Ca, Nb, to have synthesized Ba3 (Ca1.18Nb1.82) O9-δ (BCN18) powder; Heating contains Ba: Ca: Nb: citrtc acid=3: 1.18: 1.82: 12 solution; Obtain light green colloidal sol, continue drying and obtain yellow xerogel, be citrate sol.
Embodiment 2
Citrate sol 95 grams, ferrite 5 grams are mixed stirring, burnt 4 hours, get high purity composite Nano level oxide powder through 500 ℃ of high temperature.
Embodiment 3
Citrate sol 85 grams, ferrite 15 grams are mixed stirring, burnt 2 hours, get high purity composite Nano level oxide powder through 750 ℃ of high temperature.
Embodiment 4
With 30 weight part nano level gadolinium-ferrites, 0.05 weight part cobalt or manganese, 35 weight part iron carbonyls, 34.95 weight part tackiness agents, mix and put into impeller, under the 500r/min condition; Stir 25min, after compound is put into mill and ground 25min, put into impeller with tackiness agent; Under the 500r/min condition; After stirring 25min, leave standstill 5min, promptly make the radar wave absorbing coating.
Embodiment 5
With 32 weight part nano level gadolinium-ferrites, 0.06 weight part cobalt or manganese, 35 weight part iron carbonyls, 32.94 weight part tackiness agents, mix and put into impeller, under the 500r/min condition; Stir 25min, after compound is put into mill and ground 25min, put into impeller with tackiness agent; Under the 500r/min condition; After stirring 25min, leave standstill 5min, promptly make the radar wave absorbing coating.
Embodiment 6
With 35 weight part nano-level iron oxysomes, 0.07 weight part cobalt or manganese, 37 weight part iron carbonyls, 27.93 weight part tackiness agents, mix and put into impeller, under the 500r/min condition; Stir 25min, after compound is put into mill and ground 25min, put into impeller with tackiness agent; Under the 500r/min condition; After stirring 25min, leave standstill 5min, promptly make the radar wave absorbing coating.
Embodiment 7
With 40 weight part nano-level iron oxysomes, 0.05 weight part cobalt or manganese, 20 weight part iron carbonyls, 39.95 weight part tackiness agents, mix and put into impeller, under the 500r/min condition; Stir 25min, after compound is put into mill and ground 25min, put into impeller with tackiness agent; Under the 500r/min condition; After stirring 25min, leave standstill 5min, promptly make the radar wave absorbing coating.
Embodiment 8
With 50 weight part nano-level iron oxysomes, 0.05 weight part cobalt or manganese, 23 weight part iron carbonyls, 26.95 weight part tackiness agents, mix and put into impeller, under the 500r/min condition; Stir 25min, after compound is put into mill and ground 25min, put into impeller with tackiness agent; Under the 500r/min condition; After stirring 25min, leave standstill 5min, promptly make the radar wave absorbing coating.
Claims (2)
1. a radar wave absorbing coating is characterized in that, it is by following feedstock production, and the consumption of each raw material is expressed as by weight: 25～55 parts on nano level gadolinium--ferrite, 0.03～2.5 part in cobalt metal or manganese, 10～35 parts of iron carbonyls, 25～75 parts in tackiness agent;
Wherein, nano level gadolinium-ferrite is to utilize citrate sol, adopts gel method, burns through high temperature to make, and its staple is ferromagnetic nanocrystalline platy particle, plane hexad ferrite, amorphous magnetic fibre and membrana granulosa;
Said cobalt metal or manganese are meant and adopt a kind of in cobalt or the manganese powder agent that its consumption is equal to;
Said tackiness agent is selected for use in can modified polyurethane, modified polyvinyl ester, modified epoxy or the acryhic material of anti--40 ℃～+ 80 ℃ of difference variation any; Tackiness agent can also adopt the epoxyn of the hard and soft cross-linked network structure of AB type.
2. the preparation method of the described radar wave absorbing coating of claim 1 is characterized in that, comprises following process step:
Step 1 is got citrate sol and ferrite, mixes by " citrate sol: ferrite=95: 5 " part by weight proportioning, burns 4 hours through 500 ℃ of high temperature, gets high purity composite Nano level oxide powder;
Step 2 is mixed nano level gadolinium-ferrite, cobalt metal or manganese powder agent, iron carbonyl in the input impeller, under 600～100r/min condition, stirs 15-30min, obtains mixture;
Step 3 is put into mill with the mixture of step 2 preparation and is ground 15～30min, will assemble agglomerating mixture and grind owing to stirring;
Step 4 together drops into the mixture and the tackiness agent of step 3 preparation in the impeller, under 600～100r/min condition, stirs 15-30min, leaves standstill 3～5min.
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| CN2011102500291A CN102358806A (en) | 2011-08-29 | 2011-08-29 | Radar wave absorption absorbing coating and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711427A (en) * | 2012-06-20 | 2012-10-03 | 张小亚 | Multifunctional electromagnetic radiation absorber |
| CN103725073A (en) * | 2013-12-31 | 2014-04-16 | 张锦碧 | Camouflage coating |
| CN104342935A (en) * | 2014-10-21 | 2015-02-11 | 迦南(福建)新材料科技有限公司 | Anti-radar-wave fabric and preparation method thereof |
| CN104556999A (en) * | 2015-01-15 | 2015-04-29 | 安徽龙磁科技股份有限公司 | Calcium-coated ferrite magnetic core material |
| CN106519816A (en) * | 2016-10-08 | 2017-03-22 | 江苏大使同丰涂料有限公司 | Paint for absorbing electromagnetic wave and preparation method and application thereof |
| CN113717612A (en) * | 2021-09-29 | 2021-11-30 | 北京环境特性研究所 | Magnetic electromagnetic scattering inhibition coating material and preparation method and application thereof |
-
2011
- 2011-08-29 CN CN2011102500291A patent/CN102358806A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711427A (en) * | 2012-06-20 | 2012-10-03 | 张小亚 | Multifunctional electromagnetic radiation absorber |
| CN103725073A (en) * | 2013-12-31 | 2014-04-16 | 张锦碧 | Camouflage coating |
| CN103725073B (en) * | 2013-12-31 | 2016-01-20 | 张锦碧 | A kind of invisible coating |
| CN104342935A (en) * | 2014-10-21 | 2015-02-11 | 迦南(福建)新材料科技有限公司 | Anti-radar-wave fabric and preparation method thereof |
| CN104556999A (en) * | 2015-01-15 | 2015-04-29 | 安徽龙磁科技股份有限公司 | Calcium-coated ferrite magnetic core material |
| CN106519816A (en) * | 2016-10-08 | 2017-03-22 | 江苏大使同丰涂料有限公司 | Paint for absorbing electromagnetic wave and preparation method and application thereof |
| CN106519816B (en) * | 2016-10-08 | 2018-09-11 | 江苏大使同丰涂料有限公司 | A kind of coating of electromagnetic wave absorption and preparation method thereof and purposes |
| CN113717612A (en) * | 2021-09-29 | 2021-11-30 | 北京环境特性研究所 | Magnetic electromagnetic scattering inhibition coating material and preparation method and application thereof |
| CN113717612B (en) * | 2021-09-29 | 2023-01-20 | 北京环境特性研究所 | Magnetic electromagnetic scattering inhibition coating material and preparation method and application thereof |
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Application publication date: 20120222 |