CN107737917A - A kind of preparation method of sheet suede structure magnetic microwave absorption - Google Patents
A kind of preparation method of sheet suede structure magnetic microwave absorption Download PDFInfo
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 57
- 238000012545 processing Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000005275 alloying Methods 0.000 claims abstract description 14
- 238000000137 annealing Methods 0.000 claims abstract description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 24
- 238000000498 ball milling Methods 0.000 claims description 17
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 239000002253 acid Substances 0.000 claims description 11
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 10
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 10
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 10
- 239000005642 Oleic acid Substances 0.000 claims description 10
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 10
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 10
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 10
- 238000004886 process control Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 7
- 239000003708 ampul Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000010453 quartz Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 238000010306 acid treatment Methods 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000011812 mixed powder Substances 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 238000012369 In process control Methods 0.000 claims 1
- 238000010965 in-process control Methods 0.000 claims 1
- 238000005457 optimization Methods 0.000 abstract description 2
- 239000011358 absorbing material Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000002250 absorbent Substances 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- 241000656145 Thyrsites atun Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
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- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002389 environmental scanning electron microscopy Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
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- 239000012188 paraffin wax Substances 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/068—Flake-like particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/142—Thermal or thermo-mechanical treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/145—Chemical treatment, e.g. passivation or decarburisation
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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Abstract
The application provides a kind of preparation method of sheet suede structure magnetic microwave absorption, belongs to microwave absorption technical field.The preparation method of the sheet suede structure magnetic microwave absorption, is handled magnetic metallic powder, including the processing of micronization processes, flaking, the processing of removal alloying matte and annealing.The preparation method for the sheet suede structure magnetic microwave absorption that the application provides, flaking processing and matte processing are carried out to the REFe powder with fine magnetic property, the REFe powder good to intrinsic magnetic property carries out the optimization in structure, it is a kind of from interior (intrinsic performance) to the effectively excellent combination of (shape characteristic) outside, and step is clear, it is simple and easy, it can obtain the excellent REFe powder of absorbing property.
Description
Technical field
The present invention relates to microwave absorption technical field, more particularly to a kind of sheet suede structure magnetic microwave absorption
Preparation method.
Background technology
Because electronic equipment, mobile communication are in daily life using more and more common, and these electronic instruments, equipment work
As when the electromagnetic wave that gives off, can not only disturb around other electronic instruments normal work, and the body and mind of the mankind can be good for
Health brings threat.Substantial amounts of research work has been carried out in order to solve harm, people caused by electromagnetic radiation.Wherein in microwave ripple
In section (especially in 2~18GHz frequency ranges), electromagnetic wave energy is converted into other forms by using electromagnetic wave absorbing material
Energy, the radiation of electromagnetic wave and interference are suppressed with this, there is preferable effect.Electromagnetic wave absorbing material is such as coated in TV, sound
On the surface of electronic product such as sound, the mechanical, electrical brains of VCD, mobile communication, electromagnetic wave leakage can be made to drop to below safety limit (small
In 10 microwatts/square centimeter), it is ensured that health.It is applied to the equipment such as radar, microwave medicine equipment, broken microwave machine
In, injury of the electromagenetic wave radiation to operating personnel's body can be reduced to a certain extent.Microwave absorbing material is applied to build
Build in material, can solve the ghost problems caused by tall and big building reflection electromagnetic wave.And use magnetic microwave absorption material
The microwave dark room that material makes also is widely used in the fields such as radar, telecommunications and Aero-Space.In addition, magnetic microwave is inhaled
Receiving material is improving the compatibility of airborne boat load radar equipment, and improving overall performance etc. also has wide application space,
The application market of magnetic microwave absorbing material is very huge as can be seen here.
At present, various microwave absorbing materials have had extensive research, but the almost microwave absorption material of each type
Material has the limitation itself applied, and if ferrite wave-absorbing material is because saturation magnetization is than relatively low, magnetic conductivity declines under high frequency
Subtract loss that is too fast and being unfavorable for electromagnetic wave, so such material must be improved, other compound beneficial compositions, take long benefit
It is short, the significantly more absorbing material of the value that can just be applied.
Magnetic micro-powder has preferable magnetic, is a kind of new absorbing material, and its research is relatively later.Metal magnetic is micro-
Powder is due to having the advantages that high saturation magnetization, magnetic conductivity height, Curie temperature is high, coercivity is low, satisfactory mechanical property, thus
Have wide practical use in absorbing material field and potentiality.Especially the metal magnetic powder of sheet due to shape respectively to
The opposite sex, it is expected to break through the limitation of the Snoek limit, still there is higher magnetic conductivity in high band, be advantageous to lean on the magnetic loss of itself
A large amount of decay electromagnetic wave energies.Therefore, on the basis of metal magnetic powder, how it is improved, it is good prepares absorbent properties
Microwave absorption highly significant.
The content of the invention
It is an object of the invention to provide a kind of preparation method for preparing novel microwave wave absorbing agent, this method can utilize simple
REFe Magnaglos as raw material, be finally made a kind of good microwave absorption of assimilation effect by a series of processing procedures
Agent.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of sheet suede structure magnetic microwave is inhaled
Receive the preparation method of agent, it is characterised in that：Comprise the following steps：
(1) REFe Magnaglos are carried out dispersion and fining by micronization processes；REFe Magnaglos are carried out refinement powder by this process
It is broken, while cause powder to be changed into amorphous state；
Wherein, RE represents rare earth element, and REFe powder is RExFe1-x(x=0.05~0.2)；
(2) powder that flaking processing takes step (1) to obtain carries out flaking processing, processing after being mixed with process control agent
Powder cleaning afterwards, process control agent is removed, vacuumizes drying；REFe Magnaglos after processing not only have high saturation magnetic
Change intensity, while there is low coercivity；
Wherein, process control agent is the mixture of absolute ethyl alcohol and oleic acid, the matter of process control agent and the powder after refinement
Amount is than being 0.1~0.6:1；
(3) removal alloying matte processing mixes the powder that step (2) obtains with acid solution, the processing of removal alloying matte；
Powder is cleaned afterwards, remove spent acid after be dried in vacuo；Acid corrosion processing destroys the complete surface topography of flakelike powder,
It is set to become coarse and form suede structure, this structure is advantageous to increase scattering path of the electromagnetic wave in powder, plays reduction
The effect of reflection；
Wherein, H in acid solution-Quality and mixed powder mass ratio be 5~10；
(4) powder that annealing obtains step (3) carries out vacuum sealing tube, insulation of then annealing at 300~400 DEG C；Annealing
Processing will discharge the stress as caused by refinement, flaking and corrosion process, further improve the magnetic property of magnetic, make amorphous in addition
In ferro element form stable α-Fe.
Further, use ball milling progress dispersion and fining in the step (1), 700~800r/m of rotating speed, the time 120~
160min。
Preferably, in the step (1), Magnaglo encapsulates under vacuo before ball milling, inert gas shielding.
Further, use ball milling progress flaking processing in the step (2), 450~500r/m of rotating speed, the time 4~
6h。
Preferably, the mass ratio of absolute ethyl alcohol and oleic acid is 1 in the process control agent:1.
Preferably, in step (2), the powder after the completion of ball milling is cleaned with absolute ethyl alcohol to carrying out ultrasonic wave, afterwards with true
Empty pump carries out vacuumizing drying.
Further, in the step (3), removal alloying matte processing is carried out to powder using acetic acid solution, acetic acid
Concentration is 0.2~0.4mol/L.
Preferably, in step (3), removal alloying matte uses ultrasonic vibration, 10~30min of processing time when handling.
Preferably, the powder in step (3) after acetic acid treatment is cleaned with absolute ethyl alcohol progress ultrasonic wave, removes spent acid, it
Carried out vacuumizing drying with vavuum pump afterwards.
Further, in the step (4), using vitreosil tube sealing machine by powder-tight in quartz ampoule, vacuum
More than or equal to 3 × 10-3MPa, insulation of then annealing at 300~400 DEG C, annealing soaking time are more than or equal to 30min.
The present invention has the advantages and positive effects of：The sheet suede structure magnetic microwave absorption that the application provides
Preparation method, flaking processing is carried out to the REFe powder with fine magnetic property first and matte is handled, flaking processing has
Beneficial to the magnetic conductivity and saturation magnetization for improving magnetic, there is good gain effect to magnetic absorbing property；Matte processing
On the one hand the RE in magnetic Hard Magnetic phase can be removed with selective corrosion, promotes soft magnetism phase α-Fe generation, magnetic can be substantially reduced
Coercivity, this is advantageous to magnetic magnetic moment under frequency electromagnetic waves and responded rapidly to, and forms dissipation of energy, another aspect matte
Structure is advantageous to increase electromagnetic wave in the scattering path on magnetic surface, and so as to reduce the reflection of electromagnetic wave, absorbing property is carried
Height also has certain help.
The preparation method for the sheet suede structure magnetic microwave absorption that the application provides, also to after above-mentioned two-step pretreatment
Powder made annealing treatment, discharge the stress formed in two-step pretreatment process, this raising to Magnetic Properties of Magnetic also has one
It is set for using.
The preparation method for the sheet suede structure magnetic microwave absorption that the application provides, good to intrinsic magnetic property
Optimization in REFe powder progress structure is a kind of from interior (intrinsic performance) to the effectively excellent combination of outer (shape characteristic).
The preparation method that the application uses, step is clear, simple and easy, can obtain the excellent REFe powder of absorbing property.
Brief description of the drawings
Fig. 1 is the scanning electron microscope (SEM) photograph for the magnetic microwave absorption that the embodiment of the present application 2 obtains；
Fig. 2 (a), (b) are the scanning electron microscope (SEM) photograph for the magnetic microwave absorption that the embodiment of the present application 3,4 obtains respectively；
Fig. 3 (a), (b), (c), (d) are the testabilities for the magnetic microwave absorption that the embodiment of the present invention 1,2,3 and 4 obtains
Can figure.
Embodiment
In order to be better understood from the present invention, the present invention is further retouched with reference to specific embodiments and the drawings
State.
Nd is just used in following examples10Fe90Magnaglo as an example, but the preparation method not office that the application provides
It is limited to a kind of this rare earth element of Nd, is also not limited to Nd10Fe90The Magnaglo of this ratio, following examples are not intended to limit this
The practical range of application, all equivalent changes made according to the application scope and improvement etc., it all should still belong to this patent protection model
Within enclosing.
Embodiment 1
A kind of preparation method of magnetic microwave absorption, comprises the following steps：Take appropriate Nd10Fe90Powder uses vacuum stone
For English tube sealing machine by powder-tight in quartz ampoule, vacuum is 3 × 10-3MPa, then anneal in the lehr at 300~400 DEG C
It is incubated 30min.
Embodiment 2
A kind of preparation method of laminated structure magnetic microwave absorption, comprises the following steps：
(1) micronization processes：By Nd10Fe90Magnaglo carries out micronization processes, takes 8g Nd10Fe90Magnaglo is in vacuum hand
It is encapsulated in casing in ball grinder, gives argon gas protection；
Ball-milling Time is 120~160min, ratio of grinding media to material 15:1, rotating speed is 700~800r/m；
(2) flaking is handled：The powder 2g after refinement is taken to be placed in ball grinder, subsequent adition process controlling agent is (excessively program control
Preparation is the mixture of absolute ethyl alcohol and oleic acid, the two mass ratio 1:1) 0.2~0.12g, Ball-milling Time are 4~10h, and rotating speed is
450~500r/m, treat to clean powder progress ultrasonic wave with absolute ethyl alcohol after the completion of ball milling, remove oleic acid, finally use vavuum pump
Carry out vacuumizing drying；
(3) make annealing treatment：Take powder vitreosil tube sealing machine obtained by appropriate step (2) by powder-tight in quartz ampoule
In, vacuum is 3 × 10-3MPa, heat treatment insulation 30min is then carried out at 300~400 DEG C in the lehr.
Embodiment 3
A kind of preparation method of sheet suede structure magnetic microwave absorption, is comprised the following steps that：
(1) micronization processes：By Nd10Fe90Magnaglo carries out micronization processes, takes 8g Nd10Fe90Magnaglo is in vacuum hand
It is encapsulated in casing in ball grinder, gives argon gas protection；
Ball-milling Time is 120~160min, ratio of grinding media to material 15:1, rotating speed is 700~800r/m；
(2) flaking is handled：The powder 2g after refinement is taken to be placed in ball grinder, subsequent adition process controlling agent is (excessively program control
Preparation is the mixture of absolute ethyl alcohol and oleic acid, the two mass ratio 1:1) 0.6g, Ball-milling Time are 4~6h, rotating speed is 450~
500r/m, treat to clean powder progress ultrasonic wave with absolute ethyl alcohol after the completion of ball milling, remove oleic acid, finally taken out with vavuum pump
Vacuum drying；
(3) removal alloying matte is handled：Powder 0.5g obtained by step (2) is taken to add 25mL concentration in beaker as 0.2
~0.4mol/L acetic acid solution carries out removal alloying matte processing, and whole processing procedure is carried out in supersonic wave cleaning machine, locates
The reason time is 15min；After the completion of with absolute ethyl alcohol to powder carry out ultrasonic wave clean, remove spent acid, finally carried out with vavuum pump
Vacuumize drying；
(4) make annealing treatment：Take powder vitreosil tube sealing machine obtained by appropriate step (3) by powder-tight in quartz ampoule
In, vacuum is 3 × 10-3MPa, heat treatment insulation 30min is then carried out at 300~400 DEG C in the lehr.
Embodiment 4
A kind of preparation method of sheet suede structure magnetic microwave absorption, is comprised the following steps that：
(1) micronization processes：By Nd10Fe90Magnaglo carries out micronization processes, takes 8g Nd10Fe90Magnaglo is in vacuum hand
It is encapsulated in casing in ball grinder, gives argon gas protection；
Ball-milling Time is 120~160min, ratio of grinding media to material 15:1, rotating speed is 700~800r/m；
(2) flaking is handled：The powder 2g after refinement is taken to be placed in ball grinder, subsequent adition process controlling agent is (excessively program control
Preparation is the mixture of absolute ethyl alcohol and oleic acid, the two mass ratio 1:1) 0.6g, Ball-milling Time are 4~6h, rotating speed is 450~
500r/m, treat to clean powder progress ultrasonic wave with absolute ethyl alcohol after the completion of ball milling, remove oleic acid, finally taken out with vavuum pump
Vacuum drying；
(3) removal alloying matte is handled：Powder 0.5g obtained by step (2) is taken to add 25mL concentration in beaker as 0.2
~0.4mol/L acetic acid solution carries out removal alloying matte processing, and whole processing procedure is carried out in supersonic wave cleaning machine, locates
The reason time is 20min；After the completion of with absolute ethyl alcohol to powder carry out ultrasonic wave clean, remove spent acid, finally carried out with vavuum pump
Vacuumize drying；
(4) make annealing treatment：Take powder vitreosil tube sealing machine obtained by appropriate step (3) by powder-tight in quartz ampoule
In, vacuum is 3 × 10-3MPa, heat treatment insulation 30min is then carried out at 300~400 DEG C in the lehr.
Structure observation and performance test are carried out to the magnetic microwave absorption obtained by examples detailed above.
Fig. 1 is the scanning electron microscope (SEM) photograph for the magnetic microwave absorption that embodiment 2 obtains, it can be seen that obvious flaking is microcosmic
Pattern, only process control agent ratio can just obtain the small flakelike powder of thickness in proper range.
Fig. 2 (a), (b) are respectively the ESEM of embodiment 3 and the magnetic microwave absorption of embodiment 4.Embodiment 3 and reality
It is identical to apply the flaking handling process of example 4, but because the removal alloying time of embodiment 4 is longer, thus the pile effects of its powder compared with
Embodiment 3 is more preferable, it will help reduces reflection of the material to electromagnetic wave.
The magnetic property for the magnetic microwave absorption that each embodiment obtains is as shown in the table.
The magnetic property of the magnetic microwave absorption of table 1
As it can be seen from table 1 compared with Example 1, the magnetic microwave absorption prepared by embodiment 2, MsImprove about
12.7emu/g, 14.9% is improved, illustrate that shape anisotropy is strengthened Ms caused by flaking；H simultaneouslyc
Decline to a great extent, have dropped 8015Oe, have dropped 90.4%, mainly after powder fining, the exchange-coupling interaction between particle increases
Force HcReduce.
Compared with Example 2, the magnetic microwave absorption prepared by embodiment 3 and 4, HcDecline more, illustrate alloy
Changing matte processing can make the part Hard Magnetic in powder mutually be formed soft magnetism phase by corrosion, obtain the spin-exchange-coupled of Hard Magnetic soft magnetic phase phase
Effect, makes HcFurther reduce, this is advantageous to the quick response of magnetic moment.
Fig. 3 is the graph of a relation that the reflection loss for the magnetic microwave absorption that embodiment obtains becomes with frequency, and reaction magnetic is micro-
The absorption property of wave absorbent.
Specific detection method is as follows：According to powder:Paraffin=1:The ratio of 1 (mass ratio) is mixed, and external diameter is made and is
7mm internal diameters are 3.04mm, the coaxial annulus that thickness is about 3mm.Surveyed and divided using Agilent/HP8722ES vector network analyzers
Not Ce Liang paraffinized sample be in 1~18GHz frequency ranges complex dielectric permittivity and complex permeability, test temperature 298K, ambient humidity
55%.Then using following formula simulation calculate single-layer absorber thickness be respectively 1.6mm, 2.0mm, 2.5mm, 2.7mm,
Reflection loss RL when 3.0mm, 4.0mm, 5.0mm.
RL (dB)=20log | (Zin-Z0)/(Zin+Z0)|
Zin=Z0(μr/εr)1/2tanh[j(2πfd/c)(μrεr)1/2]
In formula, ZinThe input impedance of-absorbing material；
Z0=(μ0/ε0)1/2, be air impedance, μ0It is space permeability, ε0It is that vacuum dielectric is normal
Number, Z0Value be 377 Ω；
μrThe complex permeability of-absorbing material, μr=μ/μ0；
εr- with respect to complex dielectric permittivity, εr=ε/ε0；
The frequency of f- impinging microwaves；
The thickness of d- absorbing materials；
The light velocity of c- free spaces；
J- imaginary units.
From Fig. 3 (a) and (b) as can be seen that compared with Example 1, magnetic microwave absorption reflection made from embodiment 2 is damaged
Consumption (RL) is decreased obviously, and minimum reflectance peak value is respectively less than -10dB (absorptivity is more than 90%), the material wave absorbtion of embodiment 2
Can be more preferable；It can be seen that compared with Example 1 from Fig. 3 (a), (c) and (d), magnetic microwave made from embodiment 3 and embodiment 4
Absorbent reflection loss (RL) substantially declines to a great extent, and minimum reflectance peak value is respectively less than -10dB (absorptivity is more than 90%), and has
There is preferable wideband effect；Fig. 3 and above-mentioned as shown by data, the flakelike powder absorbing property of high magnetic permeability are better than the powder of common shape
End.
Find out from Fig. 3 (b), (c) and (d), the magnetic microwave absorption that embodiment 2, embodiment 3 and embodiment 4 obtain, because
Three is respectively provided with laminated structure, simply larger difference be present in surface topography, contrasts the most strong absworption peak of three, and embodiment 2 exists
When thickness is 2.7mm, the minimum -16.0dB of RL, embodiment 3 is when thickness is 2.5mm, the minimum -18.2dB of RL, embodiment 4
When thickness is 2.4mm, the minimum -45.8dB of RL, with the enhancing of suede structure, powder is effectively carried in absorption intensity
Height, and the assimilation effect for contrasting different-thickness can be seen that, and powder can also reach good assimilation effect in thinner thickness, say
Bright suede structure can effectively reduce the reflection to electromagnetic wave.
To sum up illustrate, the preparation method that the application provides, the sheet suede structure of obtained magnetic microwave absorption can have
The absorbing property of effect ground reinforcing material.
Embodiments of the invention are described in detail above, but the content is only presently preferred embodiments of the present invention,
It is not to be regarded as the practical range for limiting the present invention.All equivalent changes made according to the scope of the invention and improvement etc., all should
Still belong within this patent covering scope.
Claims (10)
- A kind of 1. preparation method of sheet suede structure magnetic microwave absorption, it is characterised in that：Comprise the following steps：(1) REFe Magnaglos are carried out dispersion and fining by micronization processes；Wherein, RE represents rare earth element, and REFe powder is RExFe1-x(x=0.05~0.2)；(2) powder that flaking processing takes step (1) to obtain carries out flaking processing after being mixed with process control agent, after processing Powder cleaning, process control agent is removed, vacuumizes drying；Wherein, process control agent is the mixture of absolute ethyl alcohol and oleic acid, the mass ratio of process control agent and the powder after refinement For 0.05~0.3；(3) removal alloying matte processing mixes the powder that step (2) obtains with acid solution, the processing of removal alloying matte；Afterwards Powder is cleaned, remove spent acid after be dried in vacuo；Wherein, H in acid solution-Quality and mixed powder mass ratio be 5~10；(4) powder that annealing obtains step (3) carries out vacuum sealing tube, insulation of then annealing at 300~400 DEG C.
- 2. the preparation method of sheet suede structure magnetic microwave absorption according to claim 1, it is characterised in that：It is described Dispersion and fining, 700~800r/m of rotating speed, 120~160min of time are carried out using ball milling in step (1).
- 3. the preparation method of sheet suede structure magnetic microwave absorption according to claim 2, it is characterised in that：It is described In step (1), Magnaglo encapsulates under vacuo before ball milling, inert gas shielding.
- 4. the preparation method of sheet suede structure magnetic microwave absorption according to claim 1, it is characterised in that：It is described Flaking processing, 450~500r/m of rotating speed, 4~6h of time are carried out using ball milling in step (2).
- 5. the preparation method of sheet suede structure magnetic microwave absorption according to claim 4, it is characterised in that：It is described The mass ratio of absolute ethyl alcohol and oleic acid is 1 in process control agent:1.
- 6. the preparation method of sheet suede structure magnetic microwave absorption according to claim 4, it is characterised in that：Step (2) in, the powder after the completion of ball milling is cleaned with absolute ethyl alcohol to carrying out ultrasonic wave, is carried out vacuumizing drying afterwards with vavuum pump.
- 7. the preparation method of sheet suede structure magnetic microwave absorption according to claim 1, it is characterised in that：It is described In step (3), removal alloying matte processing is carried out to powder using acetic acid solution, the concentration of acetic acid is 0.2~0.4mol/L.
- 8. the preparation method of sheet suede structure magnetic microwave absorption according to claim 7, it is characterised in that：Step (3) in, removal alloying matte uses ultrasonic vibration, 10~30min of processing time when handling.
- 9. the preparation method of sheet suede structure magnetic microwave absorption according to claim 7, it is characterised in that：Step (3) powder in after acetic acid treatment carries out ultrasonic wave with absolute ethyl alcohol and cleaned, and removes spent acid, is vacuumized afterwards with vavuum pump Dry.
- 10. the preparation method of sheet suede structure magnetic microwave absorption according to claim 1, it is characterised in that：Institute State in step (4), using vitreosil tube sealing machine by powder-tight in quartz ampoule, vacuum be more than or equal to 3 × 10-3MPa, so Anneal afterwards at 300~400 DEG C insulation, annealing soaking time is more than or equal to 30min.
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| JPS6399342A (en) * | 1986-10-11 | 1988-04-30 | 旭化成株式会社 | Yarn composed of ferrite fiber |
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