KR101771899B1 - The fabrication method of metal/carbon hybrid particles for coating the electromagnetic wave shielding fabric - Google Patents
The fabrication method of metal/carbon hybrid particles for coating the electromagnetic wave shielding fabric Download PDFInfo
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Images
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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/12—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
-
- B22F1/0003—
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
-
- 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
- B22F2302/00—Metal Compound, non-Metallic compound or non-metal composition of the powder or its coating
- B22F2302/40—Carbon, graphite
-
- 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
- B22F2304/00—Physical aspects of the powder
- B22F2304/10—Micron size particles, i.e. above 1 micrometer up to 500 micrometer
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Powder Metallurgy (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The present invention relates to a method of manufacturing metal / carbon hybrid particles capable of effectively shielding electromagnetic waves in a wide frequency range band (several hundred MHz to several GHz), metal / carbon hybrid particles produced by the manufacturing method, (A) preparing a metal microparticle powder, (b) preparing a carbon nanoparticle powder, (c) preparing a metal microparticle powder in the step (a), and Preparing a mixed powder by mixing the particle powder and the carbon nanoparticle powder in the step (b); And (d) inserting the carbon nanoparticles into the metal microparticles. The present invention also relates to a particle and a coating method of the metal / carbon hybrid particle for electromagnetic wave shielding.
Description
The present invention relates to a method of manufacturing metal / carbon hybrid particles capable of effectively shielding electromagnetic waves in a wide frequency range band (several hundred MHz to several GHz), metal / carbon hybrid particles produced by the manufacturing method, To a substrate.
Environmental pollution such as air, water quality and soil pollution can be confirmed through our five senses, but there is a serious problem that the fourth pollution electromagnetic wave can not be seen, heard, or felt.
Recently, the frequency of exposure to electromagnetic waves has been increasing as the usage of electronic devices has increased. It has been reported that exposure to electromagnetic waves may cause various diseases such as deterioration of human body function, reproductive function destruction, miscarriage of pregnant women, and birth defects. Particularly, household appliances such as TVs and microwave ovens emit electromagnetic waves having frequencies in the range of several hundred MHz, while wireless communication devices such as smart phones emit electromagnetic waves with high frequencies of several GHz or more.
The majority of electromagnetic wave shielding techniques according to the prior art contain a metal or magnetic particle in a polymer to impart a reflection shielding function in a low frequency region. Patent Literature 0001 discloses a technique for manufacturing an electromagnetic wave shielding material from a polymer and a metal material. In the case of metal materials, the electromagnetic wave shielding ratio in the low frequency region due to the surface reflection is high owing to the high electric conductivity, but in order to shield the high frequency, it is necessary to use a material having high conductivity. The conventional technique used as a high-frequency shielding material thus developed is to increase the characteristics of electromagnetic wave shielding by using a carbon nanotube as a conductive filler.
Patent Document 2 discloses a polymer composite for electromagnetic wave shielding, which is prepared by hybridizing carbon nanotubes and carbon fibers and a polymer in which a surface layer is coated with carbon nanotubes.
However, since the conventional techniques are effective only in a specific wavelength region such as a high frequency region or a low frequency region, there is a problem that electromagnetic waves in a wide frequency band in daily life can not be shielded.
On the other hand, a conventional method of producing a fiber having an electromagnetic wave shielding effect lowers the volume resistivity value of a fiber, and there are known two methods of using a post-processing method of coating a fiber with a conductive material and a metal fiber.
The post-processing method using a conductive material may be classified into aluminum vacuum deposition, sputtering, metal film formation through electroless plating, conductive resin coating, metal thin film laminating, copper compound fixing, etc., The frequency range of shieldable electromagnetic waves is also limited to a range of 30 MHz to 1 GHz.
Recently, in wireless communication such as LTE, considering the tendency of use of high frequency broadband electromagnetic wave of 1 GHz or more, it is urgent to develop a fiber capable of shielding a wide frequency range of several tens to several hundred MHz band including high frequency electromagnetic waves .
In order to solve the above problems, it is an object of the present invention to provide a method for manufacturing a metal / carbon hybrid particle capable of simultaneously shielding electromagnetic waves in a wide frequency range emitted by various electronic products.
Another object of the present invention is to provide a metal / carbon hybrid particle which shields and absorbs electromagnetic waves in a wide frequency band.
It is still another object of the present invention to provide a method of coating a substrate with metal / carbon hybrid particles that shield and absorb electromagnetic waves in a wide frequency band.
(B) preparing a carbon nanoparticle powder; (c) preparing a carbon nanoparticle powder; (c) preparing a carbon nanoparticle powder; (c) Mixing the metal microparticle powder in step (a) and the carbon nanoparticle powder in step (b) to prepare a mixed powder; and (d) inserting the carbon nanoparticles into the metal microparticle. .
In the method of manufacturing metal / carbon hybrid particles for electromagnetic wave shielding according to the present invention, the carbon nanoparticles are carbon nanotubes, and the metal microparticles have lower hardness than the carbon nanotubes.
In the method for producing metal / carbon hybrid particles for electromagnetic wave shielding according to the present invention, the metal microparticles may be any one selected from the group consisting of aluminum, copper, iron, nickel, tin, zinc, gold, silver, .
In the method of manufacturing metal / carbon hybrid particles for electromagnetic wave shielding according to the present invention, in the step (d), a milling process is performed using a ball having hardness higher than that of the carbon nanotubes in the mixed powder of the step (c) .
Further, in the method for producing metal / carbon hybrid particles for electromagnetic wave shielding according to the present invention, the ball is characterized by being made of stainless steel (STS), tungsten carbide or alumina.
In the method for producing metal / carbon hybrid particles for electromagnetic wave shielding according to the present invention, the electromagnetic wave is in the range of 100 MHz to 10 GHz.
In the method of manufacturing a metal / carbon hybrid particle for electromagnetic wave shielding according to the present invention, the metal microparticles in step (a) are 3 to 150 탆, and the carbon nanoparticles in step (b) have a diameter of 20 nm or less And a length of 5 mu m or less.
In the method for manufacturing electromagnetic wave shielding metal / carbon hybrid particles according to the present invention, the milling step is characterized in that the diameter of the stainless steel (STS) ball is 3 to 10 mm and the ball milling is performed for 3 to 8 hours.
In addition, the present invention provides metal / carbon hybrid particles for electromagnetic wave shielding produced by any one of the above methods.
The method for coating the substrate with the metal / carbon hybrid particles for electromagnetic wave shielding according to the present invention comprises the steps of (a) mixing a metal / carbon hybrid particle with a solvent to prepare a mixed solution, and (b) And coating the substrate with a solvent, wherein the solvent is acetone.
Further, the method for coating the substrate with the metal / carbon hybrid particles for electromagnetic wave shielding according to the present invention is characterized in that the substrate is a fiber.
The method for coating the substrate with the metal / carbon hybrid particles for shielding electromagnetic waves according to the present invention is characterized in that the coating step (b) comprises the steps of: depositing fibers in the mixed solution; A step of irradiating the fiber, and a step of drying the fiber.
According to the method for producing metal / carbon hybrid particles for electromagnetic wave shielding according to the present invention, it is possible to uniformly disperse carbon nanoparticles on metal microparticles in a simple manufacturing process, and to disperse carbon nanoparticles and metal microparticles / Carbon hybrid particles can be provided.
Further, the metal / carbon hybrid particles produced by the manufacturing method of the present invention have an advantage of shielding electromagnetic waves in a wide frequency band from several hundred MHz to several GHz.
In addition, the metal / carbon hybrid particles produced by the method of the present invention can be uniformly coated on various substrates including fibers to exhibit an excellent electromagnetic wave shielding effect.
FIG. 1 is a schematic view of a carbon nanomaterial inserted into a metal microparticle powder to produce metal / carbon hybrid particles.
2 is an electron micrograph of an embodiment of a metal / carbon hybrid particle for electromagnetic wave shielding produced by the method of the present invention.
FIG. 3 is an electron micrograph of a metal / carbon hybrid particle for electromagnetic shielding prepared by the method of the present invention coated on a felt.
4 is an electron microscope (hybrid and carbon nanotube hybrid particles) of the hybrid powder according to the ball milling time.
FIG. 5 is an electron micrograph of the shape of the hybrid powder according to the ball milling time (carbonyl iron and carbon nanotube hybrid particles).
6 shows the results of the electric field and the magnetic field reduction rate generated in the microwave oven.
In the entire specification, 'shielding' is defined as a state in which electromagnetic waves arriving from the surroundings are not transmitted. That is, when metal / carbon hybrid particles to be described later are coated on a substrate, the electromagnetic wave reached means that the electromagnetic wave is not reflected after being contacted with the hybrid particles or absorbed by the hybrid particles and does not pass through the substrate. Also, when an element is referred to as including an element, it is understood that the element may include other elements as well, without departing from the spirit or scope of the present invention.
Hereinafter, the method for producing metal / carbon hybrid particles for electromagnetic wave shielding according to the present invention and the particles produced will be described in detail with reference to the accompanying drawings 1 and 2.
(A) preparing a metal microparticle powder, (b) preparing a carbon nanoparticle powder, (c) mixing the carbon nanoparticle powder with the metal nanoparticle powder in the step (a) (B) mixing the metal microparticle powder with the carbon nanoparticle powder in step (b) to prepare a mixed powder; and (d) inserting the carbon nanoparticles into the metal microparticle.
In the step (a), the metal particles used for preparing the metal / carbon hybrid particles of the present invention are powdered and prepared. The metal microparticles are not particularly limited as long as they have an effect of shielding electromagnetic waves having frequencies in the range of several hundred MHz and are hardly lower in hardness than the carbon nanoparticles to be described later. However, iron, copper, aluminum, nickel, tin, zinc, Or an alloy thereof.
Here, the metal microparticles are preferably 3 to 150 탆, more preferably 3 to 20 탆.
If the diameter of the metal microparticles is less than 3 mu m, the diameter of the carbon nanotubes is small and the insertion of the carbon nanotubes is not easy. On the contrary, when the diameter exceeds 150 mu m, The amount of the carbon nanotubes to be inserted into the microparticles is limited, so that the microparticles are preferably in the above range.
In the step (b), the carbon particles used for preparing the metal / carbon hybrid particles of the present invention are powdered and prepared. The carbon particles have an effect of shielding electromagnetic waves having a frequency of several GHz band. The carbon particles preferably have a diameter of 20 nm or less and a length of 5 탆 or less, more preferably 10 nm or less in diameter and 3 탆 or less in length.
If the length of the carbon nanotubes exceeds 20 mu m, it is difficult to exhibit an excellent dielectric loss effect as nanoparticles. If the length exceeds 5 mu m, the carbon nanotubes may be cut in the longitudinal direction upon collision with the ball in the stirring process, The diameter and length of the carbon particles are preferably in the above range.
One embodiment of carbon nanoparticles may be carbon nanotubes, which may be single-walled, double-walled, multi-walled, rope, and the like. ≪ / RTI >
In the meantime, although only the case of performing the step (b) after the step (a) is described, the step (a) may be performed after the step (b) The step (b) may be performed at the same time.
The step (c) is a step of mixing carbon particles with the metal particles prepared through the steps (a) and (b). That is, before performing the step (d) to be described later, the metal particles and the carbon particles are mixed so as to distribute evenly.
Here, if the metal particles and the carbon particles can be uniformly mixed, the mixing method is not particularly limited.
The step (d) is a step of binding the carbon particles to the metal particles.
As described above, the metal particles have a hardness lower than that of the carbon particles, and when an external force is applied to the metal particles and the carbon particles, the carbon particles penetrate into the metal particles, (Fig. 2).
In consideration of this principle, in the present invention, the mixed powder produced in (c) is subjected to a ball milling process to uniformly disperse and insert carbon particles into the metal particles.
Here, the ball is not particularly limited as long as it is a material having a hardness higher than that of the carbon particles, but is preferably made of stainless steel (STS), tungsten carbide or alumina.
The weight ratio of the ball: mixed powder in the milling step is 20: 1 to 10: 1, more preferably 15: 1. If the stainless steel (STS) ball is in excess of 2O: 1 compared to the weight of the mixed powder, severe mechanical energy may be applied to the carbon particles to cause destruction of the carbon particles. On the other hand, There is a possibility that sufficient mechanical energy for inserting into the powder may not be applied.
Further, it is preferable that the rotation speed in the milling step is 50 to 200 rpm, more preferably 100 rpm. If the rotation speed is less than 50 rpm, sufficient mechanical energy may not be applied to insert the carbon particles into the metal powder. On the other hand, when the rotation speed exceeds 200 rpm, severe mechanical energy is applied to the carbon particles, It is preferable that the above range is satisfied.
The stirring time in the milling step is preferably 3 to 8 hours, more preferably 3 to 6 hours. When the reaction time is less than 3 hours, when the carbon particles are not fully inserted into the metal particles and, on the contrary, stirring is carried out for 8 hours or more, the carbon particles can be all inserted into the metal particles, Electromagnetic waves of several hundreds of MHz can not be sufficiently shielded, so that the above range is preferable.
In addition, the milling process is preferably performed in an Ar atmosphere in order to prevent oxidation.
The metal / carbon hybrid particles produced by the above method are excellent in binding force, and can shield electromagnetic waves of MHz by the metal particles and electromagnetic waves of GHz band caused by carbon particles.
Hereinafter, a method of coating the substrate with the metal / carbon hybrid particles produced by the above method will be described.
The method for coating a base material with electromagnetic wave shielding metal / carbon hybrid particles according to the present invention includes the steps of (a) mixing a metal / carbon hybrid particle with a solvent to prepare a mixed solution, and (b) .
The step (a) of mixing the metal / carbon hybrid particles with a solvent to prepare a mixed solution is a step of mixing a hybrid particle having carbon particles inserted into a metal and a solvent, It is preferably a solvent, and may be water, acetone, ethanol or a mixture of such solvents.
The mixed solution in which the metal / carbon hybrid particles and the solvent are mixed can be coated on the substrate through various coating methods such as spin coating, spray coating, dip coating, nozzle coating, and printing, which are known coating methods.
Here, the substrate is not particularly limited as long as it is an article requiring shielding of electromagnetic waves, and may be preferably a fiber.
Although the carbon nanoparticles are effective for shielding and absorbing electromagnetic waves in the high frequency region, they have a disadvantage in that it is difficult to homogeneously coat the fibers having a diameter of several hundreds of micrometers because they have a structure in which they are mutually entangled by van der Waals force. The coating method using the metal / carbon hybrid particles according to the present invention has an advantage of being easily coated and firmly bonded to the fibers.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope and spirit of the invention as disclosed in the accompanying drawings. And it is obvious that such variations and modifications fall within the scope of the appended claims.
[ Example ]
Example 1: Metal / carbon hybrid Particle manufacturing
A mixed powder of 30 g (Fe 29.73 g + CNT 0.27 g) was prepared by mixing carbon nanotubes (CNT) having a diameter of 10 nm and a length of 5 μm in iron (Fe) particles having a particle diameter of 2 to 3 μm.
Subsequently, the mixed powder was put in a mill and milled in an Ar atmosphere at 100 rpm for 6 hours using 450 g of STS balls so as to have a ratio of STS ball: mixed powder = 15: 1 (weight ratio) (Fe) / carbon hybrid particles are shown in FIG. 2. FIG. As can be seen from Fig. 2, it can be confirmed that the carbon particles are uniformly dispersed on the surface of the iron particles, and a part of each particle is inserted into the iron particles.
Example 2: Metal / Carbon for substrate hybrid Particle coating method
A mixed solution was prepared by mixing the metal / carbon hybrid particles prepared in Example 1 with acetone. At this time, the metal / carbon hybrid particles and acetone were mixed at a ratio of 100: 1 (volume ratio). Then, the felt was charged into the mixed solution, irradiated with ultrasonic waves for 15 minutes, and dried at room temperature. An electron micrograph of the metal / carbon hybrid particles for electromagnetic wave shielding coated on the felt is shown in FIG. As can be seen from Fig. 3, it can be confirmed that the metal / carbon hybrid particles adhere to the fibrous fibers of the felt.
Example 3: Metal / carbon hybrid Change conditions in particle manufacturing
In order to investigate the effect of the metal / carbon hybridization in the present invention, a felt coated with only a single coating of only metal particles or a single coating of carbon nanotubes was prepared as a control, And the electromagnetic shielding performance of the coated metal / carbon hybrid particle coated felt.
Further, in order to confirm the partial insertion effect of the carbon nanotubes, hybrid seeds in which carbon nanotubes were not inserted, hybrids in which carbon nanotubes were completely inserted, and hybrid particles in which carbon nanotubes were partially inserted were obtained by changing ball milling conditions And the electromagnetic wave shielding performance of the coated felt was compared with each of these hybrid particles.
Specifically, hybrid particles in which carbon nanotubes are not inserted into metal particles are subjected to ball milling for 1 hour, hybrid particles in which carbon nanotubes are completely inserted in metal particles for 24 hours, and carbon nanotubes The partially inserted hybrid particles were prepared by ball milling for 3 to 6 hours.
At this time, the carbon nanotube content was fixed at 5 vol.% And the ball / powder weight ratio was 15: 1. After the mixed powder and balls were charged into the chamber, the atmosphere inside the chamber was maintained in an Ar atmosphere. The milling speed was maintained at 100 rpm and 1 hour of milling and 1 hour rest were repeated to prevent overheating.
After the ball milling process, each coated particle was dispersed in acetone using an ultrasonic apparatus and coated on the felt using a dipping method. The hybrid powder was mixed with 400 ml of acetone at a volume ratio of 100: 1, and the felt (9 cm x 10 cm) was completely charged into the mixed solution and coated with ultrasonic waves for 15 minutes. After the coating process, the felt was dried at room temperature for 24 hours.
FIG. 4 is a photograph of a shape of a hybrid particle obtained by ball milling carbon nanotubes on copper (Cu) for 1 hour, 3 hours, and 24 hours by scanning electron microscope (SEM) (Carbonyl Iron Particle, CIP), which was shot with carbon nanotubes for 1 hour, 6 hours, and 24 hours.
The shape of the metal powder in the hybrid particles subjected to ball milling for 1 hour is close to spherical shape, and the aggregation of carbon nanotubes by van der Waals force is appearing. As the milling progresses, spherical metal powders gradually become flattened and can be seen that metal powder subjected to strong shear stress experienced severe plastic deformation during ball milling process.
The carbon nanotubes initially aggregated are uniformly dispersed by the plastic deformation of the metal powder as ball milling progresses, and inserted into the metal powder. In FIG. 4, it can be seen that carbon nanotubes are partly inserted into the surface of copper flattened in the hybrid powder milled for 3 hours. In FIG. 5, carbon nanotubes are formed on the surface of CIP flattened in the hybrid powder, It can be confirmed that it is partially inserted.
In the hybrid particles that were milled for 24 hours, some carbon nanotubes were observed on the surface, but most of the carbon nanotubes were completely inserted into the metal powder.
6 is a graph comparing electromagnetic shielding performance of each shielding material (felt before coated, copper, CIP, carbon nanotubes, and felt coated with hybrid particles per milling time) using the microwave oven as an electromagnetic wave emitting source.
At this time, the electromagnetic shielding performance of each shielding material was standardized based on the intensity of the electric field and the magnetic field measured when the shielding material was not present at the same distance from the electromagnetic wave generating source.
As can be seen from the results of the experiment using the microwave oven of FIG. 6 as a source of electromagnetic waves, the magnetic field reduction rate of 18.2%, 14.9%, and 5.3% in the case of the felt coated with Cu, CIP and carbon nanotubes was 50% , And 44.7%, respectively.
On the other hand, magnetic field reduction rates were 14.9% (1h), 23.5% (3h), 10.2% (24h) and 26.6% (1h) and 48.9% (3h) respectively when coated with Cu and carbon nanotube hybrid powder, , And 30.9% (24h) respectively.
The magnetic field reduction rates were 15% (1h), 24.2% (6h), 10.6% (24h) and 17.0% (1h) and 53.2% (6h) respectively when coated with CIP and carbon nanotube hybrid powder ) And 18.1% (24h), respectively.
As can be seen from the above results, it can be confirmed that the hybrid powder obtained by ball milling the metal microparticle powder and the carbon nanoparticle powder for 3 to 6 hours has an excellent shielding effect.
The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and equivalents thereof are to be construed as being included in the present invention.
Claims (12)
(b) preparing carbon nanotubes;
(c) mixing the metal microparticle powder in the step (a) and the carbon nanotubes in the step (b) to prepare a mixed powder; And
(d) inserting the carbon nanotubes into the metal microparticles,
The metal microparticle powder in the step (a) is carbonyl iron (CIP) having a diameter of 3 to 20 탆,
The carbon nanotubes in step (b) have a diameter of 10 nm or less and a length of 5 m or less,
In step (d), balls having a diameter of 3 to 10 mm made of stainless steel (STS), tungsten carbide or alumina having a hardness higher than that of the carbon nanotubes and the mixed powder are mixed in a weight ratio of 20: 1 to 10: 1 And then milling the mixture at a rotating speed of 50 rpm to 200 rpm for 5 to 7 hours. The method of manufacturing metal / carbon hybrid particles for electromagnetic wave shielding in the range of 100 MHz to 10 GHz.
The method comprises: (a) mixing a metal / carbon hybrid particle with a solvent to prepare a mixed solution; And
(b) coating the mixed solution on a substrate,
Wherein the solvent is acetone. 2. The method of claim 1, wherein the solvent is acetone.
Wherein the substrate is a fiber and is coated on a substrate using metal / carbon hybrid particles for electromagnetic wave shielding in the range of 100 MHz to 10 GHz.
Wherein the coating step (b) comprises the steps of: depositing fibers in the mixed solution; irradiating ultrasonic waves to the fiber-immersed mixed solution; and drying the fibers. Of metal / carbon hybrid particles for electromagnetic wave shielding.
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| KR102308382B1 (en) | 2019-12-26 | 2021-10-05 | 신라대학교 산학협력단 | Plasma-treated electromagnetic wave shielding material and method for producing the same |
| CN111230098B (en) * | 2020-03-18 | 2021-07-13 | 北京大学 | Metal-based nano composite powder material, preparation method and application thereof |
| KR102388449B1 (en) | 2020-07-08 | 2022-04-21 | 경상국립대학교산학협력단 | Electromagnetic wave shielding material and method for producing the same |
| KR102524720B1 (en) | 2020-08-27 | 2023-04-25 | (주)한국씨엠에프 | Electromagnetic wave shielding material composed of non-woven fabric and woven fabric in a stacked type and method for producing the same |
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