KR20170075832A - Electromagnetic wave shielding material using copper-ferrous alloy powder and manufacturing method of the same - Google Patents
Electromagnetic wave shielding material using copper-ferrous alloy powder and manufacturing method of the same Download PDFInfo
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- KR20170075832A KR20170075832A KR1020150184623A KR20150184623A KR20170075832A KR 20170075832 A KR20170075832 A KR 20170075832A KR 1020150184623 A KR1020150184623 A KR 1020150184623A KR 20150184623 A KR20150184623 A KR 20150184623A KR 20170075832 A KR20170075832 A KR 20170075832A
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- iron
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- 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
-
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
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- 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
- H05K9/0086—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single discontinuous metallic layer on an electrically insulating supporting structure, e.g. metal grid, perforated metal foil, film, aggregated flakes, sintering
Abstract
The electromagnetic wave shielding material using the copper alloy powder according to one embodiment of the present disclosure includes a resin and a copper alloy powder composed of 30 to 95% by weight of copper (Cu) and 5 to 70% by weight of iron (Fe). By including the copper alloy powder in the electromagnetic wave shielding material, it is possible to minimize the process in manufacturing the shielding material and to reduce the manufacturing cost and to secure the electromagnetic wave shielding effect.
Description
The present disclosure relates to an electromagnetic wave shielding material using a copper alloy powder and a manufacturing method thereof.
Recently, electromagnetic waves are flooding due to the rapid development and use of electronic, electric and communication devices such as mobile phones, wireless charging, and short distance communication, and the danger of electromagnetic waves is increasing. The electromagnetic waves emitted by the above-mentioned electronic devices may interfere with the operation of the adjacent electronic devices to provide a cause of the malfunction of the devices, or may affect the human body and cause various symptoms and diseases.
Electromagnetic shielding materials for shielding the electromagnetic waves have been developed, and metal shielding materials such as copper (Cu) and aluminum (Al), which are generally highly conductive, are used as electromagnetic wave shielding materials. However, the conductive metal is limited in the electromagnetic wave shielding effect in the high frequency range, and magnetic materials having high magnetic permeability are used. For example, iron-nickel (Fe-Ni), iron- Co) alloy is used as the material of the shielding material. The electromagnetic wave shielding material includes a magnetic material including a conductive metal and a high-priced element, so that the manufacturing cost is increased, and it is troublesome to mix the two materials.
Therefore, there is a demand for a material capable of realizing an electromagnetic wave shielding material as a single material while reducing the manufacturing cost.
The following Patent Document 1 relates to a wire or rod of an iron-copper alloy wire for shielding electromagnetic waves and a manufacturing method thereof.
An embodiment of the present disclosure is to provide an electromagnetic wave shielding material using a copper alloy powder capable of minimizing a process and reducing manufacturing cost and securing an electromagnetic wave shielding effect and a method of manufacturing the same.
The electromagnetic wave shielding material using the copper alloy powder according to one embodiment of the present disclosure may include a resin and a copper alloy powder composed of 30 to 95% by weight of copper (Cu) and 5 to 70% by weight of iron (Fe).
A method of manufacturing an electromagnetic wave shielding material using a copper alloy powder according to an embodiment of the present disclosure includes the steps of forming a copper alloy powder by spraying a gas into a melt in which Cu and Fe are dissolved, The copper alloy powder may be composed of 30 to 95% by weight of copper (Cu) and 5 to 70% by weight of iron (Fe).
According to one embodiment of the present disclosure, it is possible to provide an electromagnetic wave shielding material using a copper alloy powder capable of minimizing a process and reducing a manufacturing cost, and securing an electromagnetic wave shielding effect, and a method for manufacturing the same.
1 is a schematic cross-sectional view of an electromagnetic wave shielding material according to an embodiment of the present disclosure.
2 is a schematic cross-sectional view of an electromagnetic wave shielding material according to another embodiment of the present disclosure.
Figs. 3 to 5 show schematic cross-sectional views for explaining a method of manufacturing an electromagnetic wave shielding material according to an embodiment of the present disclosure.
Preferred embodiments of the present disclosure will now be described with reference to the accompanying drawings.
However, the embodiments of the present disclosure are provided to more fully describe the present disclosure to those skilled in the art.
The embodiments of the present disclosure can be modified into various other forms, and the scope of the present disclosure is not limited to the embodiments described below.
In addition, to include an element throughout the specification does not exclude other elements unless specifically stated otherwise, but may include other elements.
Hereinafter, the electromagnetic shielding material using the copper alloy powder according to the present disclosure will be described in detail.
The electromagnetic wave shielding material using the copper alloy powder of one embodiment of the present disclosure includes a copper alloy powder composed of 30 to 95% by weight of resin and copper (Cu) and 5 to 70% by weight of iron (Fe).
The copper alloy powder may have a structure in which copper (Cu) and iron (Fe) are uniformly distributed or a structure in which iron (Fe) precipitates are uniformly distributed in a copper (Cu) matrix.
That is, the copper alloy powder may be a mixture of copper (Cu) and iron (Fe) which are not mutually solid due to the inherent properties of the metal.
The copper alloy powder preferably has a core-shell structure or a structure in which iron (Fe) is uniformly distributed in copper (Cu) depending on the content of copper (Cu) and iron (Fe).
In the case of the copper-alloy alloy powder as the core-shell structure, the core is made of Fe-rich phase and the shell surrounding the core may be made of Cu-rich phase.
Generally, a rich phase means a region in which a specific component is included in a certain region at a higher concentration than in another region.
The presence of the Fe-rich phase in the core-shell structure copper-alloy powder means that the concentration (content) of Fe is higher than in the region other than the core, that is, the shell surrounding the core, The presence of the -rich phase means that the concentration (content) of copper (Cu) is higher than that of the core.
The copper alloy powder as the core-shell structure can be obtained when the content of iron (Fe) in the powder composition is 50 wt% or more.
Specifically, when the iron (Fe) precipitate is uniformly dispersed in a copper (Cu) base, the copper-alloy shell powder as the core-shell structure contains 50 to 70 wt% % ≪ / RTI > of iron (Fe).
When the iron (Fe) is uniformly distributed in the copper (Cu), it may be a structure in which copper (Cu) is a matrix and iron (Fe) is distributed as a precipitate.
Fig. 1 shows a schematic cross-sectional view of an electromagnetic wave shielding material according to one embodiment of the present disclosure, and Fig. 2 shows a schematic cross-sectional view of an electromagnetic wave shielding material according to another embodiment of the present disclosure.
1 and 2, the electromagnetic wave shielding material may be a mixture of the
The electromagnetic wave shielding material may be composed of 10 to 70% by weight of resin and 30 to 90% by weight of copper alloy powder. If the resin content is less than 10% by weight, the powder content in the shielding material may be high and the workability may be deteriorated. When the resin content exceeds 70% by weight, the powder content may be low and the shielding property may be deteriorated.
The resin may be at least one selected from the group consisting of silicone, urethane, ethylene, epoxy and amino.
In general, the electric field is a conductive metal and the magnetic field is a shielding effect by a magnetic material. The copper alloy has copper (Cu) as a conductive metal and iron (Fe) as a magnetic material at the same time. Fe) shielding effect compared to a single element metal can be excellent.
The core-shell structure of the copper alloy powder in which iron (Fe) is distributed in the copper (Cu) has a conductive effect equivalent to that of the copper single element powder, , But rather the electromagnetic shielding effect can be increased due to the magnetic properties of the core part iron (Fe).
In addition, the copper alloy powder is advantageous in terms of cost because it contains iron (Fe) as a part of the constituent of copper (Cu) single element powder. The copper alloy powder can be easily applied to the design, May be possible.
Hereinafter, a method of manufacturing an electromagnetic wave shielding material using the copper alloy powder according to the present disclosure will be described.
A method of manufacturing an electromagnetic wave shielding material using a copper alloy powder according to an embodiment of the present disclosure includes the steps of forming a copper alloy powder by spraying a gas into a melt in which Cu and Fe are dissolved, Wherein the copper alloy powder comprises 30 to 95% by weight of copper (Cu) and 5 to 70% by weight of iron (Fe).
The step of forming the copper alloy powder includes a step of heating copper (Cu) and iron (Fe) charged in the vessel to form a melt, and spraying gas to the melt to coagulate and powder the melt .
In the case of the conventional method for producing a copper alloy powder, it is required to add additives such as various antioxidants in addition to the steps of melting, casting, plastic working, heat treatment and the like. In the case of the present disclosure, after the melting by gas atomizing The powder can be obtained without any additional process.
The copper alloy powder produced by the method of manufacturing the copper alloy powder of the present disclosure has a feature that the Cu-rich phase and the Fe-rich phase are uniformly distributed or the Fe precipitates are uniformly distributed in the Cu matrix. That is, it is possible to provide a powder in which copper (Cu) and iron (Fe), which are not mutually dissolved due to the inherent properties of metals, are uniformly mixed. In addition, since the copper alloy powder can be produced in the form of a sheet or sprayed directly onto a workpiece by spray coating or the like, it can be advantageously applied to a complicated shape.
In the gas spraying process, the raw metal is charged in a vacuum-reduced state, the metal is melted to form a melt, the melt is injected through a nozzle, and a high-pressure gas is injected into the molten melt When sprayed, the melt in the liquid phase is pulverized by quenching due to the gas.
First, copper (Cu) and iron (Fe) are prepared and charged into a container.
The copper (Cu) may be high purity with a purity of 99% or more, and iron (Fe) (electrolytic iron, 99.99%) may be used.
The chamber is accommodated in a chamber and the chamber is controlled to a vacuum state and then a high purity argon (Ar) gas is charged to prevent oxidation and contamination of copper (Cu) and iron (Fe) Create atmosphere.
The vacuum range of the chamber is not particularly limited, and it is possible to obtain a high-vacuum and low-vacuum as well as a copper alloy powder intended even in the air.
(Cu) and iron (Fe) charged in the vessel to form a melt, and the temperature in the chamber can be heated to 800 to 2000 占 폚 at a heating rate of 1 to 200 占 폚 / min.
At this time, the dissolution method may be one of a consumable electrode slag dissolution method, a plasma dissolution method, or a high-frequency induction dissolution method, but is not limited thereto.
If the temperature raising rate exceeds 200 DEG C / min in dissolving in the above-described method, the power consumption may increase and the manufacturing cost may increase. On the other hand, when the temperature raising rate is slow, it is preferable to carry out the heating at a rate of 1 占 폚 / min or more in consideration of the fact that the production time is greatly increased and the production cost is increased. The temperature raising rate is more preferably 90 to 100 占 폚 / min.
The dissolution temperature may be 800 to 2000 占 폚.
If the melting temperature is lower than 800 ° C, the solubility of iron (Fe) to copper (Cu) may be lowered so that the two metals may not be dissolved. On the other hand, if the melting temperature is higher than 2000 ° C, . A more preferable melting temperature is 1700 to 1900 ° C.
On the other hand, it is preferable to maintain stirring and flowability of the melt by holding the melt at the melting temperature for 1 to 30 minutes. If the holding temperature is less than 1 minute, the dissolution may not be sufficiently performed. If the holding temperature exceeds 30 minutes, the energy consumption is increased and the manufacturing cost may increase.
Next, the copper alloy powder can be obtained by spraying gas onto the copper (Cu) -iron (Fe) melt.
The melt may travel through the nozzle and reach the gas atomizing device, but is not limited thereto.
The gas spraying method may be any method capable of injecting gas, for example, spraying through a spray nozzle.
The inert gas may include at least one selected from the group consisting of air, nitrogen and inert gas. Examples of the inert gas include argon (Ar), helium (He), neon (Ne), krypton (Kr), xenon (Rn), and the like, it is preferable to use argon (Ar) gas for the production cost.
The gas may be injected at an injection pressure of 50 bar (5 MPa) or less (excluding 0 bar).
By the above process, the melt rapidly coagulates due to gas spray and is made into powder. The solidification rate at which the melt solidifies may be from 10 4 to 10 6 K / s.
When a droplet is first formed in the melt upon gas spraying, iron (Fe) having a high melting point on the surface of the droplet first starts to solidify. Then, copper (Cu) having high thermal conductivity starts to solidify rapidly onto the surface of the droplet, and solidification of copper (Cu) continues from the surface of the droplet toward the center. At this time, iron (Fe) exceeding the solubility limit escapes from the Cu-rich phase and is collected at the center.
The copper alloy powder produced by the manufacturing method of the present disclosure has a structure in which copper (Cu) and iron (Fe) are uniformly distributed, or iron (Fe) precipitates are uniformly distributed in a copper Structure. That is, the copper alloy powder may be a mixture of copper (Cu) and iron (Fe) which are not mutually solid due to the inherent properties of the metal.
The copper alloy powder as the core-shell structure can be obtained when the content of iron (Fe) in the powder composition is 50 wt% or more.
Specifically, when the iron (Fe) precipitate is uniformly dispersed in a copper (Cu) base, the copper-alloy shell powder as the core-shell structure contains 50 to 70 wt% % ≪ / RTI > of iron (Fe).
When the iron (Fe) is uniformly distributed in the copper (Cu), it may be a structure in which copper (Cu) is a matrix and iron (Fe) is distributed as a precipitate.
Figs. 3 to 5 show schematic cross-sectional views for explaining a method of manufacturing an electromagnetic wave shielding material according to an embodiment of the present disclosure.
Referring to FIG. 3, the forming of the mixture may be performed by mixing the
The resin and the copper alloy powder may be mixed with each other by putting the resin (11) and the copper alloy powder (12) in the container (13) and performing one of the methods such as a mixer, an ultrasonic or a homogenizer But is not limited thereto.
The mixture (11, 12) may comprise 10 to 70% by weight of the resin and 30 to 90% by weight of the copper alloy powder.
The resin may be at least one selected from silicone, urethane, ethylene, epoxy, and amino, though not limited thereto.
In this process, stirring may be performed so that the mixing of the resin and the copper alloy can be made uniform, and further, a solvent and an additive may be added depending on the use of the mixture.
Referring to FIG. 4, the
5, the method for producing an electromagnetic wave shielding material according to another embodiment of the present disclosure in which the mixture (11, 12) produced in FIG. 3 is applied to the surface of the
The electromagnetic wave shielding material of the present disclosure can be made of a copper alloy powder to secure electromagnetic wave shielding effect with one material, and can reduce manufacturing process and manufacturing cost. In addition, the copper alloy powder can be applied to a field having a complicated shape because the product can be easily realized according to the design.
Hereinafter, the present disclosure will be described in more detail by way of examples. However, the following embodiments are only examples for explaining the present disclosure in detail, and do not limit the scope of the present disclosure.
(Example)
As shown in Table 1, the composition of Cu and Fe was adjusted to prepare a copper alloy powder by a gas injection process.
At this time, copper (Cu) and electrolytic iron, the inside of the chamber 2.0 × 10 was charged with (Fe) of high purity (99.99%) in the container of a chamber for the gas injection process - after the vacuum controlled to 3 Torr (torr) argon (Ar) gas was charged to form an atmosphere. Thereafter, the vessel was heated at a heating rate of 100 캜 / min, and then maintained at 1800 캜 for 5 minutes. Then, argon (Ar) gas was injected through the injection nozzle at an injection pressure of 50 bar or less (except for 0 bar) to prepare a copper alloy powder.
The electrical conductivity was measured according to the ASTM standard (E1004), and the eddy current formed by the electromagnetic induction of the coil was measured to evaluate the electrical conductivity. The Vickers hardness was measured in accordance with ASTM standard (E348), and the hardness was evaluated after forming the pits by pressing the pyramidal diamond particles of the face angle of 136 degrees at a constant load on the material surface. At this time, the measurement load was 0.05 kg, and the average value was calculated by measuring 10 points (3 times per point) at intervals of 1 mm.
(% IACS)
As shown in Table 1, the smaller the Fe content in the copper alloy powder, the greater the electric conductivity increase effect, and the higher the Fe content, the greater the hardness.
From the above results, it can be confirmed that a material having an electromagnetic shielding performance of an intended level can be manufactured and selected by appropriately controlling the Cu and Fe contents of the copper alloy powder.
As shown in Table 2 below, the copper alloy powder prepared above was mixed with the resin to prepare a mixture. The mixture was cooled down between two roll mills and cured to prepare a sheet-shaped shielding material.
At this time, the copper alloy powder was composed of 72.6% by weight of copper (Cu) and 27.4% by weight of iron (Fe), and a silicone resin was used as the resin.
In order to compare shielding ability with electromagnetic wave shielding materials including copper alloy powder, electromagnetic shielding materials including copper (Cu) powder and 10Ni-20Zn-ferrite powder as commercial electromagnetic shielding materials were respectively prepared. . ≪ / RTI >
In order to compare the shielding ability under the same conditions, the powder content was set to 50% by volume and the shielding ability was confirmed. The results are shown in Table 2 below. .
(6 GHz)
Referring to Table 1, it can be seen that the embodiment including the copper alloy is superior in shielding effect to that of the copper or ferrite containing comparative example.
It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure, Should be interpreted on the basis of.
11: Resin 12: Copper alloy powder
Claims (14)
A copper alloy powder comprising 30 to 95% by weight of copper (Cu) and 5 to 70% by weight of iron (Fe).
Wherein the copper alloy powder includes a core in which an Fe-rich phase is present and a shell in which a Cu-rich phase is present surrounding the core, and an electromagnetic shielding material comprising the copper alloy powder.
The copper alloy powder is a copper alloy powder having a Fe content of 50 to 70% by weight.
The electromagnetic wave shielding material using the copper alloy powder as a mixture of the copper alloy powder and the resin.
The content of the resin is 10 to 70% by weight, and the content of the copper alloy powder is 30 to 90% by weight.
And mixing the resin and the copper alloy powder to form a mixture,
Wherein the copper alloy powder comprises 30 to 95% by weight of copper (Cu) and 5 to 70% by weight of iron (Fe).
The step of forming the copper alloy powder
Heating copper (Cu) and iron (Fe) charged in the vessel to form a melt; And
And spraying a gas on the melted material to coagulate and pulverize the molten material to form an electromagnetic shielding material.
Wherein said heating is carried out at a heating rate of 1 to 200 DEG C / min and then at 800 to 2000 DEG C for 1 to 30 minutes.
Wherein the gas is at least one selected from the group consisting of air, nitrogen, and an inert gas.
Wherein the content of the resin is 10 to 70% by weight and the content of the copper alloy powder is 30 to 90% by weight.
And curing the mixture to obtain an electromagnetic shielding material in the form of a sheet.
And spraying or coating the mixture on the surface of the base material to obtain an electromagnetic wave shielding material.
Wherein the copper alloy powder includes a core in which an Fe-rich phase is present and a shell in which a Cu-rich phase is present surrounding the core.
The method of manufacturing an electromagnetic shielding material using the copper alloy powder as a core-shell structure, wherein the iron (Fe) content is 50 to 70 wt%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180117751A (en) * | 2017-04-19 | 2018-10-30 | 한국생산기술연구원 | Cu-Fe alloy and electromagnetic wave shilding material |
| CN108912966A (en) * | 2018-08-06 | 2018-11-30 | 广州市花林景观工程有限公司 | The preparation method of multifunctional coating for toilet |
| CN110699571A (en) * | 2019-11-23 | 2020-01-17 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of copper-iron alloy material with electromagnetic shielding performance |
| KR20220070953A (en) * | 2020-11-23 | 2022-05-31 | 고려제강 주식회사 | KINIZ Alloy having excellent electrical conductivity and shielding performance, and Wire having excellent electrical conductivity and shielding performance |
-
2015
- 2015-12-23 KR KR1020150184623A patent/KR20170075832A/en not_active Application Discontinuation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180117751A (en) * | 2017-04-19 | 2018-10-30 | 한국생산기술연구원 | Cu-Fe alloy and electromagnetic wave shilding material |
| CN108912966A (en) * | 2018-08-06 | 2018-11-30 | 广州市花林景观工程有限公司 | The preparation method of multifunctional coating for toilet |
| CN110699571A (en) * | 2019-11-23 | 2020-01-17 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of copper-iron alloy material with electromagnetic shielding performance |
| CN110699571B (en) * | 2019-11-23 | 2021-03-12 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of copper-iron alloy material with electromagnetic shielding performance |
| KR20220070953A (en) * | 2020-11-23 | 2022-05-31 | 고려제강 주식회사 | KINIZ Alloy having excellent electrical conductivity and shielding performance, and Wire having excellent electrical conductivity and shielding performance |
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