CN101740143A - Amorphous fiber-containing electromagnetic wave absorbing material and method for preparing same - Google Patents
Amorphous fiber-containing electromagnetic wave absorbing material and method for preparing same Download PDFInfo
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- CN101740143A CN101740143A CN200910238376A CN200910238376A CN101740143A CN 101740143 A CN101740143 A CN 101740143A CN 200910238376 A CN200910238376 A CN 200910238376A CN 200910238376 A CN200910238376 A CN 200910238376A CN 101740143 A CN101740143 A CN 101740143A
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Abstract
The invention relates to an amorphous fiber-containing electromagnetic wave absorbing material and a method for preparing the same. In particular, the invention relates to an electromagnetic wave absorbing material, and the electromagnetic wave absorbing material is characterized by comprising amorphous fiber and basis materials, wherein the amorphous fiber is used as a wave absorbing component and is the chopped fiber. In addition, the invention also relates to a method for preparing the electromagnetic wave absorbing material, and the method comprises the following steps of: (1) preparing the amorphous fiber; and (2) distributing the amorphous fiber on the basis materials by the screening method.
Description
Technical field
The invention belongs to field of magnetic material, relate to a kind of electromagnetic wave absorbent material that contains amorphous fiber and preparation method thereof.
Background technology
At present, with mobile phone, notebook computer and Digital Video etc. be the novel mobile electronic product of representative to the development of small-sized, multifunctional direction, the gordian technique of wherein taking is high frequencyization, digitizing and integrated.Yet consequent electromagnetic interference (EMI) is on the rise and has produced many-sided negative effect.The effect of absorption-type electromagnetic shielding material is by various loss mechanism incident electromagnetic wave to be converted to heat energy or other forms of energy, makes electromagnetic wave neither to outside transmission, also not to internal reflection, is a kind of method of effective inhibition electromagnetic interference (EMI).Electromagnetic wave absorbent material commonly used usually with ferrite or amorphous powder as wave absorbing agent, with compound type or the coating type absorbing material of laminating of polymkeric substance.
Ferrite Material has ferromagnetic resonance and absorbs and the magnetic permeability scattering effect, and self-resistance rate height is good wave absorbing agent, is widely used in the stealth technology field.Owing to be difficult to be combined into the high-absorbility sheet type absorbing material of thickness, it be very limited in mobile phone, notebook computer and portable digital product less than 1mm.
Amorphous powdered alloy has good soft magnet performance and higher resistivity, is the preferred material of high-frequency electromagnetic wave absorbent.Hitachi Metals is developed " ABSORSHIELD K-E " serial electromagnetic wave absorbent material, adopts the single roller rapid quenching method to prepare amorphous thin ribbon, by the method for mechanical alloying strip is pulverized, simultaneously with SiO again
2Be coated on the amorphous powder, be pressed into sheet, make absorbing material.Alps electrical equipment Co., Ltd. develops " LIQUALLOY " serial electromagnetic wave absorbent material, adopt water atomization or aerosolization method to prepare amorphous powdered alloy, by high energy ball mill method powder is ground to form the flat powder of thickness 1-2 micron again, sneak into and make the sheet absorbing material in the matrix material.
Amorphous powder is bigger for the influence of its absorbing property at the orientation of sheet absorbing material, the included angle of amorphous powder length direction and thickness direction is 90 when spending in theory, the absorbing property of material is best, reason owing to amorphous powder form and absorbing material preparation technology, the existing preparation technology only can be controlled at angle between 80≤φ≤90 degree, has limited the further raising of absorbing property.In order to improve absorptivity, the shared volume ratio of its amorphous powder meets or exceeds 50%, causes the density of absorbing material bigger.
In addition, the absorbing property that adopts the absorbing material that amorphous powder makes along with thickness reduce decline to a great extent, thickness is that the following absorbing material performance of 0.2mm is relatively poor.Above-mentioned reason causes the weight of the absorbing material that adopts the amorphous powder preparation and thickness can't satisfy the development trend of existing electronic product to miniaturization, lightness direction.
Summary of the invention
In order to overcome the defective of prior art, the purpose of this invention is to provide a kind of with amorphous fiber as electromagnetic wave absorbent material of wave absorbing agent and preparation method thereof, by improving the orientation of wave absorbing agent, reduce the thickness and the density of absorbing material, prepare the absorbing material of performance height, thin thickness, light weight.
Concrete, the present invention relates to a kind of electromagnetic wave absorbent material, it is characterized in that described electromagnetic wave absorbent material comprises amorphous fiber and matrix material, wherein said amorphous fiber is as wave absorbing agent and be chopped strand.
In a preferred embodiment of the invention, the length direction of wherein said amorphous fiber is vertical substantially with the thickness direction of electromagnetic wave absorbent material.
In a preferred embodiment of the invention, the included angle of the length direction of wherein said amorphous fiber and the thickness direction of electromagnetic wave absorbent material is in 85≤φ≤90 scopes, preferably in 89≤φ≤90 scopes.
In a preferred embodiment of the invention, wherein said electromagnetic wave absorbent material in the form of sheets, its thickness is no more than 1 millimeter, preferably is no more than 0.5 millimeter, more preferably no more than 0.15 millimeter.
In a preferred embodiment of the invention, wherein said amorphous fiber is to be selected from glass to coat at least a in amorphous fiber and the amorphous naked fiber.
In a preferred embodiment of the invention, wherein said amorphous fiber is that length is not less than 1mm, is not more than the fiber of 30mm.
In a preferred embodiment of the invention, wherein said matrix material is an insulating material, be preferably be selected from rubber, resin, PC film and glued membrane one or more.
In a preferred embodiment of the invention, wherein amorphous fiber is distributed in the surface of matrix material, or embeds in the middle of the matrix material, or in the interlayer of matrix material.
In a preferred embodiment of the invention, the density of wherein said electromagnetic wave absorbent material is less than 5g/cm
3, preferably less than 3g/cm
3, be more preferably less than 1.5g/cm
3
In a preferred embodiment of the invention, the wherein said amorphous fiber attitude of quenching, or annealed processing.
Further, the invention still further relates to the preparation method of described electromagnetic wave absorbent material, this method comprises the steps:
(1) preparation amorphous fiber;
(2) mode by screening is arranged in amorphous fiber on the matrix material.
In a preferred embodiment of the invention, wherein adopt the Taylor spin processes to prepare glass and coat the amorphous wire material, and further prepare described amorphous fiber by cutting described silk material.
In a preferred embodiment of the invention, wherein spin method or melt and quench and follow the example of the naked silk of preparation amorphous material, and further prepare described amorphous fiber by cutting described silk material by interior round water.
In a preferred embodiment of the invention, wherein adopt glass is coated the method that the amorphous wire glassy layer peels off to prepare the naked silk of amorphous material, and further prepare described amorphous fiber by cutting described silk material.
In a preferred embodiment of the invention, wherein adopt glass is coated amorphous wire to prepare described amorphous fiber, and further peel off glassy layer and prepare described amorphous fiber by cutting described silk material.
In a preferred embodiment of the invention, the step that wherein prepares amorphous fiber comprises the step of described silk material being carried out annealing in process.
In a preferred embodiment of the invention, wherein said annealing in process is that isothermal annealing is handled or direct current joule annealing in process.
In a preferred embodiment of the invention, wherein in the process of annealing in process on the silk material stress application or magnetic field.
In a preferred embodiment of the invention, wherein by described amorphous fiber is dispersed in amorphous fiber on the matrix material by screening plant.
In a preferred embodiment of the invention, wherein said screening plant is made up of two-layer above screen cloth, preferably is made up of 3-6 layer screen cloth.
In a preferred embodiment of the invention, the order number of wherein said screen cloth is the 5-80 order.
Description of drawings:
Fig. 1 coats the stereoscan photograph (180 times) of amorphous wire for glass.
Fig. 2 is the stereoscan photograph (50 times) of the naked silk of amorphous.
Fig. 3 is the pictorial diagram of absorbing material.
Fig. 4 is absorbing material preparation method's a synoptic diagram.
Fig. 5 is absorbing material performance test philosophy figure.
Fig. 6 is an absorbing material transport property S11 test result.
Fig. 7 is an absorbing material transport property S21 test result.
Fig. 8 is an absorbing material loss Rtp result of calculation.
Embodiment:
In the present invention, obtain amorphous fiber by cutting amorphous wire material, the preparation of amorphous wire material can be adopted the known several different methods of prior art, wherein mainly contains following several:
1, glass coats spin processes: it is that foundry alloy is placed on the glass tube bottom that glass coats spin processes, utilizes the mode of induction heating that the foundry alloy in the glass tube is melted.Heat after the foundry alloy fusing is transmitted to glass tube, makes the glass tube bottom softening.Pull out a glass capillary by tensile machine from the glass tube bottom, filling alloy wire in the kapillary.Spray liquid coolant continuously to kapillary by nozzle, make alloy rapid solidification wherein, form glass and coat amorphous wire.In addition, the mode that can adopt hydrofluoric acid solution to dissolve, the glassy layer that glass is coated amorphous wire is peeled off, and obtains the naked silk of amorphous.It is to adopt glass to coat the silk material that spin processes prepares that glass shown in Fig. 1 coats the amorphous wire material, has promptly coated the composite structure of one deck glassy layer outside metal-cored.
2, interior round water spins method: it is to add chilled water in the drum of high speed rotating that interior round water spins method, and under action of centrifugal force, chilled water rotates synchronously at the inwall formation ring tank of drum and with rotating drum.Foundry alloy is put into quartz nozzle, utilize induction heating mode fusing foundry alloy.Charge into gases at high pressure again and make fusion foundry alloy liquid spray into chilling in the water along a side following current of drum in quartz ampoule, the continuous interior round water that obtains rapid solidification spins the naked silk of amorphous.In addition, this kind silk material diameter can carry out cold-drawn to it as required about 100 microns, thereby reduces silk material diameter, increases silk material length.The naked silk of amorphous shown in Fig. 2 material is that circle water spins the method preparation in adopting.
3, melt czochralski method: the melt czochralski method utilizes the mode of induction heating, adopt taper inductive coil fusing foundry alloy, the surface tension of the magnetic suspension force that inductive coil produces, fusing foundry alloy, the gravity three of foundry alloy self reach balance, form a stable weld pool in the foundry alloy upper end.Feed foundry alloy by guide piece, cool off foundry alloy at the position that utilizes guide piece to be connected with foundry alloy simultaneously, prevents foundry alloy top partial melting in addition.There is the circular copper wheel of a high speed rotating weld pool top, and the copper wheel edge is taper, and the foundry alloy that melts is cut, and obtains the naked silk of amorphous.
Absorbing material amorphous fiber among the present invention attitude of can quenching also can be annealed processing.Described annealing in process is that isothermal annealing is handled or direct current joule annealing in process.Isothermal annealing is handled and to be meant the amorphous wire material is put into annealing furnace, is heated to temperature requiredly, and keeps certain hour.The processing of direct current joule is meant on the amorphous wire material and applies DC current, and keeps certain hour.And further prepare described amorphous fiber by cutting described silk material.
In above-mentioned annealing in process process, stress application or magnetic field on the amorphous wire material as required.Stress application can adopt the mode that hangs counterweight or weight on the amorphous wire material; Also can adopt spring to connect amorphous wire material and strain gauge,, thereby keep constant stress according to strain gauge measured value regulating spring degree of tightness.Applying magnetic field can put into the silk material in the middle of the solenoid, applies DC current and produce D.C. magnetic field on solenoid, the amorphous wire material is vertically placed along magnetic direction get final product; Also can with the amorphous wire material on the column type jig, place a long straight conductor, on lead, apply D.C. magnetic field, around lead, form toroidal magnetic field, magnetic direction and amorphous wire material vertical consistency like this in the jig center.
Above-mentioned preparation method and method for annealing are the method that those skilled in the art understand, and those skilled in the art can select suitable technological parameter according to specific circumstances.
In a preferred embodiment of the invention, amorphous wire material of the present invention can be an amorphous wire material as described below, this amorphous wire material is to comprise metal-cored and compound substance glassy layer, wherein this glassy layer coats that this is metal-cored, wherein said metal-cored be that amorphous material and its composition comprise by mass percentage:
The Fe of 1-15 quality %;
The Si of 2-12 quality %;
Total amount is one or more elements among B, Nb, Cu, Mn, Mo, Ni, Cr and the Al of being selected from of 2-25 quality %; And
The Co of surplus.
In another embodiment of the invention, amorphous wire material of the present invention is by having the naked silk of the above-mentioned metal-cored amorphous of forming that constitutes.
Fig. 3 is the absorbing material pictorial diagram, and amorphous fiber is arranged between matrix film and the double faced adhesive tape.
In one embodiment of the invention, absorbing material preparation method synoptic diagram as shown in Figure 4.At first, with the matrix material horizontal positioned; Then, a plurality of screen cloth vertical directions are arranged, and placed the matrix material top; Then, amorphous fiber is dropped into screen cloth from the dog-house of screen cloth top in the middle of; At last, vibrating screen panel sieves amorphous fiber on the matrix material.
By the electromagnetic wave absorbent material that method for preparing goes out, its absorbing property adopts in the IEC62333 international standard, and the method for microstrip line is tested.Fig. 5 is the test philosophy figure of absorbing property, and wherein Reference numeral 41 is an absorbing material, the 42nd, and microstrip line, the 43rd, network analyzer.When test, absorbing material is lain on the microstrip line, measure the S11 and the S21 parameter of absorbing material by network analyzer.
Embodiment 1:
Adopt glass coating spin processes to prepare the attitude glass that to quench and coat the amorphous wire material, thereby through shearing the amorphous fiber that obtains, 400 ℃ of treatment temperatures, 1 hour processing time after the isothermal annealing processing.The composition of described amorphous fiber is Co
72Fe
5Si
8B
15, the fibre metal core diameter is 12 microns, and glassy layer thickness is 2 microns, and length is 12 millimeters.
Absorbing material preparation method synoptic diagram at first, lies in a horizontal plane in double faced adhesive tape on the pallet as shown in Figure 4; Then, start the three stacked vibrating screen panels that add (screen mesh size is the square screen cloth of 200mm * 200mm, and the order number is 20 orders); Secondly, respectively the amorphous fiber of 200mg is dropped into screen cloth from four dog-houses in the middle of; Then, amorphous fiber is fallen the double faced adhesive tape upper surface from screen cloth after, the double faced adhesive tape that will have amorphous fiber takes off; At last, the PC film is overlayed on the side surface that double faced adhesive tape has amorphous fiber, promptly finished the preparation of absorbing material.
In the present embodiment absorbing material pictorial diagram as shown in Figure 3, after amorphous fiber embedded in the middle of the double faced adhesive tape, the one side that will have amorphous fiber was affixed on the PC film surface.Selected PC film thickness is 35 microns, and selected double faced adhesive tape thickness is 85 microns.
For the electromagnetic wave absorbent material in the present embodiment, the length direction of amorphous wire material is vertical substantially with the thickness direction of absorbing material, and its included angle is in 89≤φ≤90 scopes; The density 1.2g/cm of absorbing material
30.12 millimeter of the thickness of absorbing material.
Comparative example 1
The absorbing material that adopts amorphous powder to make as wave absorbing agent, amorphous powder consist of Co
72Fe
5Si
8B
15Amorphous powder is mixed in the middle of the resin, is pressed into sheet, make absorbing material, preparing included angle is that 0.5 millimeter, density are 3.8g/cm at 80≤φ≤90 scopes, thickness
3Absorbing material.
Fig. 6 represents the transmission characteristic parameter S11 that reflects when being positioned on the microstrip line for electromagnetic wave absorbent material, as seen from the figure, embodiments of the invention 1 are compared with comparative example 1, and are approaching at the two S11 parameter value of whole frequency, illustrate that the reflection of embodiments of the invention 1 is equal to comparative example.
Fig. 7 represents the transmission characteristic parameter S21 of transmission when being positioned on the microstrip line for electromagnetic wave absorbent material, as seen from the figure, embodiments of the invention 1 are compared with comparative example 1, and the S21 parameter of embodiments of the invention 1 is starkly lower than comparative example, illustrate that the transmission of embodiments of the invention 1 is lower than comparative example.
Fig. 8 is the electromagnetic wave absorbent material loss family curve Rtp by calculating, as seen from the figure, embodiments of the invention 1 are compared with comparative example 1, the Rtp parameter of embodiments of the invention 1 is starkly lower than comparative example 1, illustrate that embodiments of the invention 1 compare with comparative example 1 and have higher transmission attenuation, promptly show better electromagnetic noise and suppress effect.
Claims (21)
1. an electromagnetic wave absorbent material is characterized in that, described electromagnetic wave absorbent material comprises amorphous fiber and matrix material, and wherein said amorphous fiber is as inhaling the ripple component and being chopped strand.
2. the described electromagnetic wave absorbent material of claim 1, the length direction of wherein said amorphous fiber is vertical substantially with the thickness direction of electromagnetic wave absorbent material.
3. the described electromagnetic wave absorbent material of claim 2, the included angle of the length direction of wherein said amorphous fiber and the thickness direction of electromagnetic wave absorbent material is in 85≤φ≤90 scopes, preferably in 89≤φ≤90 scopes.
4. as any one described electromagnetic wave absorbent material among the claim 1-3, wherein said electromagnetic wave absorbent material in the form of sheets, its thickness is no more than 1 millimeter, preferably is no more than 0.5 millimeter, more preferably no more than 0.15 millimeter.
5. as any one described electromagnetic wave absorbent material among the claim 1-3, wherein said amorphous fiber is to be selected from glass to coat at least a in amorphous fiber and the amorphous naked fiber.
6. electromagnetic wave absorbent material as claimed in claim 5, wherein said amorphous fiber are that length is not less than 1 millimeter, are not higher than the chopped strand of 30mm.
7 as any one described electromagnetic wave absorbent material among the claim 1-3, and wherein said matrix material is an insulating material, be preferably be selected from rubber, resin, PC film and glued membrane one or more.
8. as any one described electromagnetic wave absorbent material among the claim 1-3, wherein amorphous fiber is distributed in the surface of matrix material, or embeds in the middle of the matrix material, or in the interlayer of matrix material.
9. as any one described electromagnetic wave absorbent material among the claim 1-3, the density of wherein said electromagnetic wave absorbent material is less than 5g/cm
3, preferably less than 3g/cm
3, be more preferably less than 1.5g/cm
3
10. as any one described electromagnetic wave absorbent material among the claim 1-3, the wherein said amorphous fiber attitude of quenching, or annealed processing.
11. the preparation method of any one described electromagnetic wave absorbent material among the claim 1-10, this method comprises the steps:
(1) preparation amorphous fiber;
(2) mode by screening is dispersed in amorphous fiber on the matrix material.
12. method as claimed in claim 11 wherein adopts the Taylor spin processes to prepare glass and coats amorphous wire, thereby prepares described amorphous wire material, makes amorphous fiber through shearing again.
13. method as claimed in claim 11 is wherein spun method or melt by interior round water and is quenched and follow the example of the naked silk of preparation amorphous, thereby prepares described amorphous wire material, makes amorphous fiber through shearing again.
14. method as claimed in claim 11 wherein adopts glass is coated amorphous wire to make amorphous fiber through shearing, the method that glassy layer is peeled off prepares the naked silk of amorphous again.
15. method as claimed in claim 11 wherein adopts glass is coated the method that the amorphous wire glassy layer peels off to prepare the naked silk of amorphous material, and further prepares described amorphous fiber by cutting described silk material.
16. method as claimed in claim 11 wherein adopts glass is coated amorphous wire to prepare described amorphous fiber by cutting described silk material, and further peels off glassy layer and prepare described amorphous fiber.
17. method as claimed in claim 11, the step that wherein prepares amorphous fiber comprises the step of described fiber being carried out annealing in process.
18. being isothermal annealing, method as claimed in claim 17, wherein said annealing in process handle or direct current joule annealing in process.
19. method as claimed in claim 18, wherein in the process of annealing in process on fiber stress application or magnetic field.
20. as any one described method among the claim 11-19, wherein make described amorphous fiber by screening plant, thus with amorphous fiber on matrix material.
21. as method as described in the claim 20, wherein said screening plant is made up of one deck or two-layer above screen cloth, preferably is made up of 3-6 layer screen cloth.
22. as the method for claim 20, the order number of wherein said screen cloth is the 5-80 order.
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| CN104177745A (en) * | 2014-08-14 | 2014-12-03 | 中南大学 | Wave-absorbing type polymethacrylimide foam/chopped fiber composite material and preparation method thereof |
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| CN106263135A (en) * | 2015-05-22 | 2017-01-04 | 北京恒维科技有限公司 | A kind of electromagnetic protection clothes |
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| CN108218240A (en) * | 2018-01-29 | 2018-06-29 | 湖南航天磁电有限责任公司 | A kind of unorganic glass base complex ferrite absorbing material and preparation method thereof |
| CN113480972A (en) * | 2021-06-30 | 2021-10-08 | 军事科学院系统工程研究院军需工程技术研究所 | Wave-absorbing material with glass coated with amorphous wires |
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| CN104177745A (en) * | 2014-08-14 | 2014-12-03 | 中南大学 | Wave-absorbing type polymethacrylimide foam/chopped fiber composite material and preparation method thereof |
| CN106192574A (en) * | 2015-04-03 | 2016-12-07 | 北京恒维科技有限公司 | A kind of anti-theft security paper |
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| CN106192549A (en) * | 2015-04-03 | 2016-12-07 | 北京恒维科技有限公司 | A kind of anti-theft security paper |
| CN106263135A (en) * | 2015-05-22 | 2017-01-04 | 北京恒维科技有限公司 | A kind of electromagnetic protection clothes |
| CN107949261A (en) * | 2017-11-15 | 2018-04-20 | 中国科学院宁波材料技术与工程研究所 | A kind of electromagnetic wave absorbent material and preparation method thereof |
| CN107949261B (en) * | 2017-11-15 | 2020-03-03 | 中国科学院宁波材料技术与工程研究所 | Electromagnetic wave absorbing material and preparation method thereof |
| CN108218240A (en) * | 2018-01-29 | 2018-06-29 | 湖南航天磁电有限责任公司 | A kind of unorganic glass base complex ferrite absorbing material and preparation method thereof |
| CN108218240B (en) * | 2018-01-29 | 2020-11-27 | 湖南航天磁电有限责任公司 | Inorganic glass-based composite ferrite wave-absorbing material and preparation method thereof |
| CN113480972A (en) * | 2021-06-30 | 2021-10-08 | 军事科学院系统工程研究院军需工程技术研究所 | Wave-absorbing material with glass coated with amorphous wires |
| CN113480972B (en) * | 2021-06-30 | 2023-11-07 | 军事科学院系统工程研究院军需工程技术研究所 | Wave absorbing material of glass-coated amorphous wire |
| CN114045435A (en) * | 2021-11-11 | 2022-02-15 | 泉州天智合金材料科技有限公司 | Iron-based amorphous nanocrystalline wave-absorbing material and preparation method thereof |
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Open date: 20100616 |