CN106637507A - Magnetic alloy/dielectric oxide composite nanofiber and preparation method thereof, and wave-absorbing coating prepared by adopting nanofiber - Google Patents
Magnetic alloy/dielectric oxide composite nanofiber and preparation method thereof, and wave-absorbing coating prepared by adopting nanofiber Download PDFInfo
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- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
- D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
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- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention discloses a magnetic alloy/dielectric oxide composite nanofiber and a preparation method thereof, and a wave-absorbing coating prepared by adopting the nanofiber. The magnetic alloy/dielectric oxide composite nanofiber comprises magnetic alloy and dielectric oxide, wherein the magnetic alloy and the dielectric oxide particles are distributed in the axial direction of the nanofiber. The preparation method comprises the steps: mixing the magnetic alloy and dielectric oxide metal salt uniformly and dissolving the mixture in a solvent to prepare a spinning solution; and adopting an electrostatic spinning technology to prepare a PVP/metal salt precursor fiber from the spinning solution, drying, roasting and reducing to prepare the composite nanofiber. The thickness of the wave-absorbing coating prepared by adopting the composite nanofiber is 1 to 3 mm. The magnetic alloy/dielectric oxide composite nanofiber and the preparation method thereof, and the wave-absorbing coating prepared by adopting the nanofiber have the advantages that the composite fiber is thin, wide in frequency band and high in absorptivity, and can strongly absorb almost the whole frequency band of 2 to 18 GHz; and the electromagnetic parameters and the microwave absorbing characteristic of the fiber can be regulated and controlled conveniently in a wide range by changing the proportion of a ferromagnetic phase and a dielectric phase and the chemical constitution.
Description
Technical field
The invention belongs to electromagnetic wave absorbent material field, more particularly to a kind of magnetic alloy/dielectric oxide composite Nano
Fiber and preparation method and the microwave absorbing coating prepared using the fiber.
Background technology
As ghz band electromagnetic wave is in terms of telecommunications field such as mobile phone, WLAN, radar system etc.
Extensively application, the electromagnetic radiation for bringing therewith is also serious all the more with interference, and this not only brings potential hazard to human health, and
The problems such as may also result in information leakage and the system failure；On the other hand, modern and future war requires to reduce weapon as far as possible
Survival ability and penetration ability are improved to realize its electromagnetism stealth in the radar reflection section of equipment.Do then for electromagnetism is solved
Disturb and pollute, and the stealthy problem of military equipment, development and the exploitation of high-performance electromagnetic wave absorbent material are constantly subjected to various countries
Pay much attention to.
Absorption of the absorbing material to electromagnetic wave depends on filling radio-radar absorber therein, and its absorbing property is main
Microstructure depending on complex permeability/complex dielectric permittivity, electromagnetic impedance match feature and absorbent etc..By attenuating mechanism, inhale
Wave material can be divided into magnetic loss type and the big class of dielectric loss type two.Dielectric loss type absorbing material such as C, BaTiO3、ZnO、TiO2、
SnO2, SiC etc. typically have the advantages that density is low, intensity is high, high temperature resistant, but its absorption intensity is weaker, absorption band is narrower；Magnetic
Loss-type absorbing material such as ferrite, carbonyl iron, metallicl magnetic material etc. absorb strong, bandwidth, but exist mostly density it is high,
With thickness is big, less stable the shortcomings of.Either magnetic loss type or dielectric loss type absorbing material, when they are used alone
Because impedance matching property is poor, be generally individually difficult to meet development of modern scientific technology proposed to absorbing material performance " it is thin,
Gently, it is wide, strong " composite request.Numerous studies to show and carry out the absorbent of magnetic loss and the various loss forms of dielectric loss many
The compound nanostructured composite wave-suction material of making of unit is an effective way for strengthening absorbing property.Using nano combined suction ripple material
The loss cooperative effect of each component and the adjustable advantage of electromagnetic parameter in material, by adjust the architectural feature of material, chemical composition,
Microscopic appearance etc. makes it have stronger electromagnetic attenuation ability and good impedance matching property simultaneously, to reach low-density, strong
Absorb and wide band effect.
Relative to traditional ferrite wave-absorbing material, metallicl magnetic material such as Fe, Co, Ni and its alloy etc. satisfy with higher
With the intensity of magnetization and magnetic conductivity, while their the Snoek limit are in a relatively higher frequency, such metallicl magnetic material is
Make to remain to keep higher magnetic conductivity in microwave frequency band, as a result can be designed that as absorbent using metallicl magnetic material thinner
Microwave absorbing coating.But because metallicl magnetic material has good electric conductivity, vortex effect is also easy to produce outside plus under Electromagnetic Field
Should, cause its magnetic conductivity to be remarkably decreased in high-frequency range, so as to badly influencing the absorbing property of such material and applying valency
Value.
To suppress eddy current effect to improve high frequency electromagnetic characteristics and absorbing property, people enter to magnetic metal microwave absorption
Substantial amounts of modified and doping of having gone is studied.A kind of method is to reduce the size of the magnetic metal particle i.e. sub-micro to below skin depth
Rice is to nanometer scale；Another method is exactly by itself and resistance height and dielectric properties good dielectric oxide such as SiO2、ZnO、
Al2O3、TiO2、SnO2、BaTiO3Etc. being combined, this not only can be blocked using the good insulating properties of these dielectric oxides
The formation of vortex flow, and the introducing of what is more important dielectric oxide can also strengthen the dielectric loss ability of system, pass through
The cooperative effect of magnetic loss and dielectric loss come the impedance matching property that is effectively improved between absorbing material and free space, significantly
Improve microwave absorbing property.But so far, research of the people to the nano combined absorbing material of feeromagnetic metal/dielectric oxide is main
Concentrate on the zero dimensional nanometer materials such as Nano capsule, core shell structure microballoon, and relevant its one-dimensional nano structure composite and its
Preparation technique and application is also rarely reported.
In recent years, one-dimensional nano structure material such as nano wire, nanofiber, nanotube and nanometer rods etc. are because of its unique shape
Shape anisotropy provides the loss mechanisms different from isotropism particulate and original advantage is shown in terms of absorbing material,
A kind of rising novel wave-absorbing material is become.One-dimensional nano structure also has significant space confinement effect, can
Make each component realize being uniformly distributed on a microscopic scale, can solve the problem that Chang Yi goes out in three-dimensional block, two-dimensional film and zero dimension powder
Existing particle agglomeration and heterogeneous distribution problem, greatly improve the contact area between component, not only contribute to strengthen it is ferromagnetic/be situated between
Cooperative effect in electric compound system between surface/interface effect and dielectric loss and magnetic loss, but also can be in nanoscale
In the range of form good electromagnetic matching.
Therefore, the unique texture that had by means of one-dimensional nano structure material and performance characteristic are by feeromagnetic metal and dielectric
Oxide in-situ is compounded to form one dimension fibre shape nano composite material, is expected to further strengthen the microwave-absorbing of the compound system
Can, for Development of Novel high-performance one-dimensional structure nano composite wave-suction material science and technology, promote feeromagnetic metal/dielectric oxidation
Thing composite has great importance and is worth in electro-magnetic wave absorption with the application in shielding field.
The content of the invention
Goal of the invention：The first object of the present invention is to provide a kind of with good wave-absorbing effect, and thickness of thin, frequency band
It is wide, absorbing strong and electromagnetic parameter and microwave absorbing property can magnetic alloy/dielectric oxide composite nano fiber for regulating and controlling of wide scope；
The second object of the present invention is to provide the preparation method of the composite fibre；The third object of the present invention is to provide using the compound fibre
Microwave absorbing coating prepared by dimension.
Technical scheme：Magnetic alloy/dielectric oxide the composite nano fiber of the present invention, a diameter of the 80 of the nanofiber
～300nm, it includes that mol ratio is 1:9～9:1 magnetic alloy and dielectric oxide, the magnetic alloy and dielectric oxide
Grain is axially distributed along the nanofiber, in one-dimentional structure.
Furtherly, the magnetic alloy that adopts of the present invention is for Fe-Co alloy/C, the mol ratio of Fe and Co in the Fe-Co alloy/C
For 4:1～1:4；Dielectric oxide includes BaTiO3、ZnO、Al2O3、SnO2In one or more.
The method that the present invention prepares magnetic alloy/dielectric oxide composite nano fiber, comprises the steps：
(1) it is dissolved in solvent after the associated metal salt of magnetic alloy and dielectric oxide is mixed respectively according to mol ratio,
Add polyvinylpyrrolidone to mix, spinning solution is obtained；
(2) spinning solution is prepared into by PVP/ slaine precursor fibres using electrostatic spinning technique, and at 80～100 DEG C
After being dried 12～24,1～6h of roasting under the conditions of 650～950 DEG C, then 0.5～3h is reduced under the conditions of 350～550 DEG C,
Can be prepared by composite nano fiber.
Furtherly, the solvent for adopting in preparation method of the invention includes ethanol, acetic acid, deionized water, N, N- diformazans
Two kinds in base formamide (DMF)；The total mass fraction of slaine is 6～25%, preferably 8～18% in spinning solution, is adopted
The slaine of the mass fraction, can be more beneficial for obtaining even thickness, the composite nano fiber of diameter narrow distribution.
Furtherly, in step (2), can under the conditions of 750～900 DEG C 2～4h of roasting；Can be in 400～500 DEG C of conditions
1～2h of lower reduction.
The microwave absorbing coating that the present invention is prepared using magnetic alloy/dielectric oxide composite nano fiber, the thickness of the coating
For 1～3mm, it includes magnetic alloy/dielectric oxide composite nano fiber that matrix silica gel and mass fraction are 40～60%.
Beneficial effect：Compared with prior art, remarkable advantage of the invention is：The composite fibre not only thickness of thin, frequency band
Wide, absorption is strong, almost there is strong absorption in whole 2～18GHz frequency ranges, and its electromagnetic parameter and Microwave Absorption Properties can
Ferromagnetic ratio and its chemical composition with dielectric phase is easily changed by, and heat treatment process parameter carries out wide scope tune
Control；The present invention realizes the combination of ferrimag and dielectric oxide by one-dimensional nano structure, using 1-dimention nano material
The architectural characteristic of material and its confinement effect enhance the cooperative effect in compound system between magnetic loss and dielectric loss, obtain height
Performance feeromagnetic metal/dielectric oxide composite nano fiber microwave absorption, has more preferable than corresponding zero-dimension structural composite
Wave-absorbing effect；Meanwhile, in the preparation, magnetic is gone out with reference to hydrogen heat selective reduction process fabricated in situ using electrostatic spinning technique
Alloy/dielectric oxide composite nano fiber microwave absorption, process is simple, easy to operate, low cost, yield are high, can be continuous
Magnetic alloy/dielectric oxide composite nano fiber is prepared in a large number.Additionally, the microwave absorbing coating prepared using the fiber, each coating
Almost there is stronger absorption in whole 2～18GHz frequency ranges, most strong absworption peak peak value exceedes -30dB, reflection loss
The Absorber Bandwidth of (i.e. absorptivity is more than 99%) reaches about 15GHz below -20dB, can cover half S-band and whole C to Ku
Wave band.
Description of the drawings
Fig. 1 is the SEM photograph of Fe-Co alloy/C/ZnO composite nano fibers prepared by the embodiment of the present invention 1；
Fig. 2 is the XRD spectra of Fe-Co alloy/C/ZnO composite nano fibers prepared by the embodiment of the present invention 1；
Fig. 3 be the Fe-Co alloy/C/ZnO composite nano fibers/silica gel microwave absorbing coating for preparing of the embodiment of the present invention 1 2～
Microwave absorbing property curve in 18GHz frequency ranges.
Specific embodiment
Technical scheme is described further below in conjunction with the accompanying drawings.
Embodiment 1
The preparation of composite nano fiber：According to ferromagnetic phase Fe2Co alloys are weighed with the mol ratio of dielectric phase ZnO for 1: 1
0.6622g cobalt nitrates, 1.8384g ferric nitrates and 0.4994g zinc acetates are poured into conical flask, while adding N, N- dimethyl methyls
(i.e. mass ratio is 1 for acid amides (DMF) and each 7.5g of ethanol:1) again by 2gPVP after, magnetic agitation is completely dissolved to all slaines
During (mean molecule quantity is 1300000) is added to the solution, continues magnetic agitation and form within about 3～5 hours uniform, transparent, stable
Spinning solution, the weight/mass percentage composition of wherein PVP and slaine is respectively 10% and 12%.By the solution for preparing in voltage
It is intensity 1kV/cm (i.e. voltage 20kV, receive apart from 20cm), solution propulsion speed 0.5mL/h, 20～25 DEG C of environment temperature, relative
Electrostatic spinning is carried out under conditions of humidity 30～40% and makes PVP/ slaine composite precursor fibers.By the presoma collected
Fiber to be put into program control electric furnace after 100 DEG C of 12～24h of drying and be first heated to 750 DEG C in atmosphere and roasting obtains phase in 4 hours
Oxide composite nano fiber is answered, hydrogen is passed through again when furnace temperature drops to 450 DEG C, the reduction treatment in hydrogen atmosphere is obtained for 1 hour
It is (Fe to chemical composition2Co)0.5-(ZnO)0.5Composite nano fiber microwave absorption.As Figure 1-3, it is obtained to answer
Close nanofiber microscopic appearance good, thickness is more uniform, and average diameter is about 200nm, in solid construction, tied by body-centered cubic
Structure Fe-Co alloy/C and the phase composition of wurtzite ZnO two, without other dephasigns.
The preparation of microwave absorbing coating：With silica gel as matrix, by prepared (Fe2Co)0.5-(ZnO)0.5Composite nano fiber is micro-
Wave absorbent is uniformly mixed and made into individual layer microwave absorbing coating with silica gel, when absorbent contents are 50wt%, and coating layer thickness is 1mm,
Its minimal reflection loss is located at 14GHz and reaches -63dB；When coating layer thickness changes between 1.0～3.0mm, reflection loss-
It is 4.3～16.3GHz that below 20dB is absorption band of the absorptivity more than 99%.
Embodiment 2
Basic process is with embodiment 1, difference：Fe in product2The mol ratio 2 of Co and ZnO:8, cobalt nitrate, nitre
Sour iron, the quality of zinc acetate are respectively 0.4416g, 1.2261g and 1.3323g, obtain chemical composition for (Fe2Co)0.2-
(ZnO)0.8Composite nano fiber microwave absorption, its average diameter is about 200nm.
The microwave absorbing coating prepared using the composite nano fiber, when absorbent contents be 50wt%, coating layer thickness be 1mm
When, the minimum reflectance of individual layer composite nano fiber/silica gel microwave absorbing coating reaches -73.9dB at 17.8GHz；Coating layer thickness
When changing between 1～3mm, absorption frequency scope of the reflection loss less than -20dB is 5～18GHz, and bandwidth reaches 13GHz, is covered
75% C-band and whole X and Ku wave bands.
Embodiment 3
Basic process is with embodiment 1, difference：Fe and Co mol ratios 1 in Fe-Co alloy/C:2, cobalt nitrate, nitric acid
Iron, the quality of zinc acetate are respectively 0.9844g, 0.6833g and 1.3323g, obtain chemical composition for (FeCo2)0.5-(ZnO)0.5
Ferromagnetic/dielectric composite nano fiber microwave absorption, its average diameter is about 200nm.
The microwave absorbing coating prepared using the composite nano fiber, when absorbent contents be 50wt%, coating layer thickness be 1.3mm
When, the minimum reflectance of individual layer composite nano fiber-silica gel microwave absorbing coating reaches -81.5dB at 17.1GHz；Coating layer thickness exists
When changing between 1～3mm, reflection loss is 5.8-18.0GHz in the absorption frequency scope of below -20dB.
Embodiment 4
Basic process is with embodiment 1, difference：The aerial sintering temperature of precursor fibre is 850 DEG C, hydrogen
Thermal reduction temperature is 450 DEG C, and the recovery time is 2 hours, (the Fe for obtaining2Co)0.5-(ZnO)0.5Composite nano fiber microwave absorption
The average diameter of agent is about 180nm.
The microwave absorbing coating prepared using the composite nano fiber, when absorbent contents are 50%, coating layer thickness is 1.3mm
When, the minimal losses of monolayer silicon matrix microwave absorbing coating reach -100.3dB at 17.5GHz.Coating layer thickness is between 1～3mm
When, it is 5.4～18.0GHz that reflection loss exceedes the absorption frequency scope of -20dB.
Embodiment 5
Basic process is with embodiment 1, difference：Dielectric oxide is BaTiO3, PVP, metatitanic acid in spinning solution
The quality of four butyl esters, barium acetate, cobalt acetate and ferric acetyl acetonade be respectively 1.2g, 0.2950g, 0.2214g, 0.5038g and
1.4287g, remaining is solvent, is made up of 8.2g acetic acid and 8.2g ethanol.Spinning solution voltage 15kV, receive apart from 20cm,
Electrostatic spinning, the identical heat treatment process of gained precursor fibre Jing embodiment 1 are carried out under conditions of solution propulsion speed 1mL/h
Chemical composition is finally obtained for (Fe2Co)0.5-(BaTiO3)0.5Composite nano fiber microwave absorption, its average diameter is about
220nm, in porous hollow structure.
The microwave absorbing coating prepared using the composite nano fiber, when absorbent contents be 60wt%, coating layer thickness be 1.3mm
When, individual layer (Fe2Co)0.5-(BaTiO3)0.5The absworption peak of composite nano fiber/silica gel microwave absorbing coating at 14.4GHz, peak value
For -34.4dB；When coating layer thickness is between 1～3mm, frequency range of the reflection loss less than -20dB is 7.7～18GHz.
Embodiment 6
Basic process is with embodiment 5, difference：Fe in target product2Co and BaTiO3Mol ratio be 7:3, it is front
It is 850 DEG C to drive the aerial sintering temperature of body fiber, and the average diameter of gained composite nano fiber is about 200nm.
The microwave absorbing coating prepared using the composite nano fiber, when absorbent contents be 60wt%, coating layer thickness be 1mm
When, individual layer (Fe2Co)0.7-(BaTiO3)0.7The absworption peak of composite nano fiber/silica gel microwave absorbing coating is minimum at 15.5GHz
Reflection loss reaches -68.2dB；When coating layer thickness is between 1～3mm, reflection loss less than -20dB frequency range be 6.4～
18GHz。
Embodiment 7
Basic process is with embodiment 1, difference：Dielectric oxide is Al2O3, Fe2Co and Al2O3Mol ratio be
4:1, it is according to the stoichiometric proportion of each metal in product that ferric nitrate, cobalt nitrate and the aluminum nitrate and 2gPVP that amount to 2.4g is molten
In the mixed solvent of 9.36g ethanol and 6.24g deionized waters composition, Jing is sufficiently stirred for forming uniform and stable spinning solution；
Electrospinning conditions are voltage 20kV, receive apart from 15cm, solution propulsion speed 0.3mL/h；Gained precursor fibre is in air
In sintering temperature be 850 DEG C, reduction temperature and time are respectively 450 DEG C and 2 hours, (the Fe for obtaining2Co)0.8-(Al2O3)0.2
The average diameter of composite nano fiber microwave absorption is about 150nm, in solid construction.
The microwave absorbing coating prepared using the composite nano fiber, when absorbent contents be 40wt%, coating layer thickness be 1.8mm
When, individual layer (Fe2Co)0.8-(Al2O3)0.2The minimal reflection loss of composite nano fiber/silica gel microwave absorbing coating is -33dB；Coating
When thickness is between 1～3mm, it is 8.5～18GHz that reflection loss exceedes the frequency range of -20dB.
Embodiment 8
Basic process is with embodiment 1, difference：Dielectric oxide is SnO2, Fe2Co and SnO2Mol ratio be
1:4, ferric nitrate (0.6570g), the cobalt acetate (0.2026g) and four of 2g will be amounted to according to the stoichiometric proportion of each metal in product
Stannic chloride (1.1404g) and 2gPVP are dissolved in the mixed solvent that 8g ethanol is constituted with 8gDMF, and Jing is sufficiently stirred for forming uniform
Stable spinning solution；Electrospinning conditions are voltage 20kV, receive apart from 20cm, solution propulsion speed 0.3mL/h；Before gained
It is 700 DEG C to drive the aerial sintering temperature of body fiber, and 450 DEG C of Jing hydrogen thermal reductions 1 hour obtain (Fe2Co)0.2-(SnO2)0.8It is multiple
Nanofiber microwave absorption is closed, its average diameter is about 120nm, in solid construction.
The microwave absorbing coating prepared using the composite nano fiber, when absorbent contents be 60wt%, coating layer thickness be 1.3mm
When, individual layer (Fe2Co)0.2-(SnO2)0.8The minimal reflection loss of composite nano fiber/silica gel microwave absorbing coating is -71dB；Apply thickness
When degree changes between 1～3mm, frequency range of the reflection loss less than -20dB is 5～18GHz.
Embodiment 9
Basic process is with embodiment 5, difference：Dielectric oxide is by BaTiO3With the phase compositions of ZnO two, spinning is molten
In liquid the quality of PVP, butyl titanate, barium acetate, zinc acetate, cobalt acetate and ferric acetyl acetonade be respectively 1.4g, 0.3246g,
0.2436g, 0.2094g, 0.4751g and 1.3473g, solvent is 8g acetic acid and 8g ethanol, and gained composite nano fiber microwave is inhaled
The chemical composition for receiving agent is (Fe2Co)0.5-BaTiO3)0.25(ZnO)0.25, average diameter is about 280nm.
The microwave absorbing coating prepared using the composite nano fiber, when absorbent contents be 60wt%, coating layer thickness be 1.2mm
When, at 15.5GHz, peak value is -45.6dB to the absworption peak of individual layer composite nano fiber/silica gel microwave absorbing coating；Coating layer thickness
When between 1～3mm, frequency range of the reflection loss less than -20dB is 7.1～18GHz.
Embodiment 10
Basic process is with embodiment 8, difference：Dielectric oxide is by SnO2Constitute with ZnO two-phases, spinning solution
The quality of middle PVP, ferric nitrate, cobalt acetate, butter of tin and zinc acetate is respectively 1.7g, 0.7364g, 0.2267g, 0.6382g
And 0.3996g, solvent is made up of 8.15g ethanol with 8.15gDMF, the materialization of the composite nano fiber microwave absorption for obtaining
Consist of (Fe2Co)0.2-(SnO2)0.4(ZnO)0.4, its average diameter is about 100nm.
The microwave absorbing coating prepared using the composite nano fiber, when absorbent contents be 50wt%, coating layer thickness be 1.2mm
When, the minimum reflectance of individual layer composite nano fiber/silica gel microwave absorbing coating reaches -75dB at 16.9GHz；Coating layer thickness is 1
When changing between～3mm, absorption frequency scope of the reflection loss less than -20dB is 4.5～18GHz.
Claims (10)
1. a kind of magnetic alloy/dielectric oxide composite nano fiber, it is characterised in that：A diameter of the 80 of the nanofiber～
300nm, it includes that mol ratio is 1:9～9:1 magnetic alloy and dielectric oxide, the magnetic alloy and dielectric oxidation composition granule
Axially it is distributed along the nanofiber, in one-dimentional structure.
2. magnetic alloy according to claim 1/dielectric oxide composite nano fiber, it is characterised in that：The magnetic
Alloy is Fe-Co alloy/C, and the mol ratio of Fe and Co is 4 in the Fe-Co alloy/C:1～1:4.
3. magnetic alloy according to claim 1/dielectric oxide composite nano fiber, it is characterised in that：The dielectric
Oxide includes BaTiO3、ZnO、Al2O3、SnO2In one or more.
4. a kind of method of the magnetic alloy/dielectric oxide composite nano fiber prepared described in claim 1, it is characterised in that
Comprise the steps：
(1) according to mol ratio the slaine for forming magnetic alloy and dielectric oxide is dissolved in solvent respectively, it is to be dissolved to add afterwards
Enter polyvinylpyrrolidone, then Jing is sufficiently stirred for that spinning solution is obtained；
(2) spinning solution is prepared into by PVP/ slaine precursor fibres using electrostatic spinning technique, and is carried out at 80～100 DEG C
After being dried 12～24h, 1～6h of roasting under the conditions of 650～950 DEG C, then 0.5～3h is reduced under the conditions of 350～550 DEG C, i.e.,
Composite nano fiber can be obtained.
5. the method for preparing magnetic alloy/dielectric oxide composite nano fiber according to claim 4, its feature exists
In：In the step (1), solvent includes any two kinds in ethanol, acetic acid, deionized water, DMF.
6. the method for preparing magnetic alloy/dielectric oxide composite nano fiber according to claim 4, its feature exists
In：In the step (1), the mass fraction of slaine is 6～25%.
7. the method for preparing magnetic alloy/dielectric oxide composite nano fiber according to claim 4, its feature exists
In：In the step (1), the mass fraction of polyvinylpyrrolidone is 5～15%.
8. the method for preparing magnetic alloy/dielectric oxide composite nano fiber according to claim 4, its feature exists
In：In the step (2), 2～4h of roasting under the conditions of 750～900 DEG C.
9. the method for preparing magnetic alloy/dielectric oxide composite nano fiber according to claim 4, its feature exists
In：In the step (2), 1～2h is reduced under the conditions of 400～500 DEG C.
10. the suction that prepared by a kind of magnetic alloy described in any one of employing claim 1-3/dielectric oxide composite nano fiber
Ripple coating, it is characterised in that：The thickness of the coating is 1～3mm, and it includes the magnetic that matrix silica gel and mass fraction are 40～60%
Property alloy/dielectric oxide composite nano fiber, the composite nano fiber is dispersed in silica gel.
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