KR20170033921A - Method for manufacturing copper-ferrous alloy powder and copper-ferrous alloy powder using the same - Google Patents
Method for manufacturing copper-ferrous alloy powder and copper-ferrous alloy powder using the same Download PDFInfo
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- KR20170033921A KR20170033921A KR1020150131342A KR20150131342A KR20170033921A KR 20170033921 A KR20170033921 A KR 20170033921A KR 1020150131342 A KR1020150131342 A KR 1020150131342A KR 20150131342 A KR20150131342 A KR 20150131342A KR 20170033921 A KR20170033921 A KR 20170033921A
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- 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
- B22F9/026—Spray drying of solutions or suspensions
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- B22F1/025—
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- 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
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/10—Copper
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- 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
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/35—Iron
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Abstract
The present invention relates to a copper alloy powder, and more particularly, to a method for producing a copper alloy powder excellent in electromagnetic shielding performance and a copper alloy powder produced thereby.
Description
The present invention relates to a copper alloy powder, and more particularly, to a method for producing a copper alloy powder excellent in electromagnetic shielding performance and a copper alloy powder produced thereby.
Copper ferroalloy (CFA) is a process alloy of a Fe-rich phase (body centered cubic lattice) with a small amount of copper at room temperature and a Cu-rich phase (face-centered cubic lattice) with a small amount of iron.
In order to obtain such a copper alloy, when iron is dissolved at 1550 ° C in the dissolution of copper and iron, and then copper is added, it appears that the iron is immediately melted and the iron and copper are melted in the melting furnace.
However, copper and iron are components that do not solidify with each other. If the molten metal is left as it is without stirring, the molten copper is present on the lower part of the melting furnace due to the difference of the specific gravity, do.
On the other hand, Patent Documents 1 and 2 propose a method of producing a copper alloy material by dissolving copper and iron.
In the above documents, a copper-iron alloy ingot is produced by injecting a copper-iron molten metal into an ingot case, and then a predetermined product such as a plate material or a wire rod is obtained through forging, rolling, drawing, heat treatment or the like.
As a method for dissolving copper and iron, a consumable electrode slag dissolution method, a plasma dissolution method, or a high-frequency induction dissolution method is applied. By this method, copper and iron are dissolved to disperse iron particles in a copper liquid phase, Flux or deoxidizer is added to prevent quality deterioration.
However, this method has to undergo various processes for producing a product of a copper alloy, and copper and iron are not uniformly mixed.
One aspect of the present invention relates to a method for producing a copper alloy powder having a uniform shape irrespective of the mixing ratio of copper and iron which are not mutually dissolved and having excellent electromagnetic wave shielding performance and a copper alloy powder produced therefrom.
According to an aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: charging copper (Cu) and iron (Fe) into a vessel; Heating the copper and iron charged in the vessel to form a melt; And a step of coagulating and pulverizing the molten material by spraying a gas through a spray nozzle to produce a copper alloy powder by a gas spraying process.
Another aspect of the present invention provides a copper alloy powder produced by the above-described manufacturing method and comprising 30 to 95% by weight of copper (Cu) and 5 to 70% by weight of iron (Fe).
According to the present invention, it is possible to provide a copper alloy powder in which copper (Cu) and iron (Fe) are uniformly distributed, and the copper alloy powder is excellent in electrical conductivity and hardness, There is an effect that can be applied to.
FIG. 1 shows a principle of forming a copper alloy powder by a gas spraying process.
2A and 2B show the results of observing the structures of the copper alloy powder 2a and the sintered body 2b according to the embodiment of the present invention.
The inventors of the present invention have conducted intensive studies to provide a copper alloy powder applicable to various industrial fields such as automobiles, electric and electronic devices, robot control devices, medical devices, communication devices, and conductive cables with excellent electromagnetic wave shielding performance. gas atomizing process is used, a copper alloy powder of uniform structure can be obtained without any additional process. The present invention has been accomplished based on this finding.
Conventionally, in order to produce a copper alloy, it has been required to add additives such as various antioxidants in addition to the steps of melting, casting, plastic working, heat treatment, etc. However, according to the present invention, Powder can be obtained.
The copper alloy powder of the present invention obtained therefrom has a structure in which 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 solid with each other due to the inherent properties of metals, are uniformly mixed. The copper alloy powder of the present invention can be produced in the form of a sheet , Spray coating, or the like, it is possible to apply the present invention to a complicated shape.
Hereinafter, the present invention will be described in detail.
A method of manufacturing a copper alloy powder according to an aspect of the present invention includes: charging copper (Cu) and iron (Fe) into a vessel; Heating the copper and iron charged in the vessel to form a melt; And coagulating and pulverizing the molten material by spraying a gas, and manufacturing conditions and the like for each step will be described in detail.
The gas spraying process according to the present invention is a method in which a raw material metal is charged in a vacuum-reduced state, the metal is melted and a high-pressure atomizing gas is supplied to a molten metal sprayed in a liquid phase to powder the liquid phase .
First, prepare copper and iron, then charge it into the container.
At this time, it is preferable that copper has high purity of 99% or more in purity, and electrolytic iron (99.99%) can be used for iron.
In order to prevent oxidization and contamination of copper and iron charged in the vessel, it is preferable to control the chamber to a vacuum state and charge the argon (Ar) gas of high purity to create an atmosphere Do. At this time, the vacuum range is not particularly limited, and it is possible to obtain a copper alloy powder which is intended not only in high vacuum and low vacuum but also in the air.
In order to dissolve the copper and iron charged in the vessel, it is preferable to form the copper-iron melt by heating at a heating rate of 1 to 200 DEG C / min.
At this time, the dissolving method is not particularly limited, but one of the following methods may be employed, for example, a consumable electrode slag dissolution method, a plasma dissolution method, or a high-frequency induction dissolution method.
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, there is no problem even if the temperature raising rate is low, but 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.
If the melting temperature is less than 800 ° C, the solubility of Fe to Cu is lowered, so that the two metals are not dissolved. On the other hand, if the melting temperature is higher than 2000 ° C, the manufacturing cost is increased There is a concern. 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.
Then, the copper-iron melt obtained from the above-mentioned process is atomized by spraying gas to obtain a copper alloy powder.
At this time, as a method of spraying the gas, any method capable of spraying the gas is possible, and for example, it can be sprayed through the spray nozzle.
The inert gas may be at least one selected from the group consisting of argon (Ar), helium (He), neon (Ne), krypton (Kr), xenon Xe), and radon (Rn). However, it is preferable to use argon (Ar) gas for the production cost.
The gas is preferably injected at an injection pressure of 50 bar (5 MPa) or less (except 0 bar).
When the gas is sprayed as described above, the melt rapidly solidifies, and more specifically, can be solidified at a rate of 10 4 to 10 6 K / s.
The copper alloy powder of the present invention obtained through the above-mentioned method has a core-shell structure depending on the content of copper (Cu) and iron (Fe), or the iron (Fe) precipitate is uniformly distributed in the copper matrix Is preferable.
FIG. 1 shows a principle of forming a copper alloy powder by a gas spraying process. More specifically, when a droplet is initially formed upon gas spraying, iron (Fe) having a high melting point on the surface first coagulates. Thereafter, copper (Cu) having a high thermal conductivity begins to solidify rapidly from the surface, so that copper (Cu) coagulation continues toward the center portion, and iron (Fe) exceeding the solubility limit escapes from the Cu- ≪ / RTI >
At this time, if the content of the Fe component is relatively high, when the solidification is completed, the structure of the core-shell, that is, the Fe-rich phase exists in the central portion, and the outer portion surrounding the center portion is made of the Cu- (Fig. 1 (A)).
On the other hand, when the content of the Cu component is relatively high, the time for collecting the Fe to the center portion due to the rapid high-speed of Cu is insufficient, so that the Fe precipitates are uniformly dispersed in the Cu matrix instead of the core- (Fig. 1 (B)).
Generally, a rich phase (a rich phase) means a region in which a specific component is contained in one region at a higher concentration than in another region.
The existence of the Fe-rich phase in the core in the core-shell structure of the present invention means that the concentration of Fe ((Fe)) is lower than that of the shell surrounding the core, And the presence of a Cu-rich phase in the shell region means that the concentration (content) of Cu is higher than that of the core.
The copper alloy powder of the present invention may be composed of 30 to 95% by weight of copper (Cu) and 5 to 70% by weight of iron (Fe). When the content of iron in the powder composition is 50% -shell structure powder can be obtained.
More specifically, when the copper alloy powder of the present invention has a core-shell structure, it contains iron (Fe) in an amount of 50 to 70% by weight, and when Fe precipitates are uniformly dispersed in a Cu matrix (Fe) may be contained in an amount of not less than 5 wt% and less than 50 wt%, and the remainder excluding the iron (Fe) is copper (Cu).
Hereinafter, the present invention will be described more specifically by way of examples. It should be noted, however, that the following examples are intended to illustrate the invention in more detail and not to limit the scope of the invention. The scope of the present invention is determined by the matters set forth in the claims and the matters reasonably inferred therefrom.
( 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, high-purity copper (99.99%) and electrolytic iron were charged into a chamber of the chamber for the gas injection process, and then the inside of the chamber was vacuum-controlled at 2.0 × 10 -3 torr and argon To create 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 structure of the powders prepared for each composition was confirmed by a microscope, and the powder was made into a sintered body by SPS (Spark Plasma Sintering).
At this time, after the copper alloy powder was charged into the chamber, the inside of the chamber was vacuum-controlled at 3.0 × 10 -1 torr or more to form an atmosphere. Thereafter, the temperature of the copper alloy powder inside the chamber was raised to 600 ° C at a rate of 30 ° C / min, and then sintered for 30 minutes.
Electrical conductivity and Vickers hardness were measured for each of the sintered bodies prepared above, and the results are shown in Table 1 below.
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 also measured according to the ASTM standard (E384), 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)
(Hv)
(The remainder excluding the Fe component in Table 1 is the Cu component).
As shown in Table 1, it can be seen that the higher the Cu content of the copper alloy powder, the greater the electric conductivity increase effect, and the higher the Fe content, the greater the hardness.
From these results, it will be possible to manufacture and sort materials having desired electromagnetic shielding performance by appropriately controlling the Cu and Fe contents of the copper alloy powder.
Meanwhile, FIGS. 2A and 2B show the results of observation of the structure of each powder and sintered body. When the Fe content is relatively high, the core-shell structure is clearly formed, whereas when the Cu content is relatively high, Is uniformly distributed.
Claims (10)
Heating the copper and iron charged in the vessel to form a melt; And
And coagulating and pulverizing the molten material by spraying a gas
Wherein the method comprises the steps of:
Wherein the 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 gas selected from air, nitrogen, and an inert gas.
Wherein the copper alloy powder has a core-shell structure, a Fe-rich phase is present in the center portion, and a Cu-rich phase is present in the outer portion surrounding the center portion. Way.
Wherein the copper alloy powder is one in which Fe precipitates are uniformly dispersed in a Cu matrix.
Wherein the copper alloy powder has a core-shell structure, a Fe-rich phase is present in a center portion, and a Cu-rich phase is present in an outer portion surrounding the center portion.
Wherein the core-shell structure has an iron (Fe) content of 50 to 70 wt%.
Wherein the copper alloy powder is one in which Fe precipitates are uniformly dispersed in a Cu matrix.
Wherein the iron (Fe) content is 5 wt% or more and less than 50 wt% when the Fe precipitates are uniformly dispersed in a Cu matrix.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020150131342A KR20170033921A (en) | 2015-09-17 | 2015-09-17 | Method for manufacturing copper-ferrous alloy powder and copper-ferrous alloy powder using the same |
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| KR1020150131342A KR20170033921A (en) | 2015-09-17 | 2015-09-17 | Method for manufacturing copper-ferrous alloy powder and copper-ferrous alloy powder using the same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019124837A1 (en) * | 2017-12-24 | 2019-06-27 | 주식회사 포스코 | Highly electrically conductive and high strength copper alloy and manufacturing method thereof |
| WO2019172564A1 (en) * | 2018-03-09 | 2019-09-12 | 블루메탈(주) | Copper-ferrous alloy cable having high shielding property |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130106908A (en) | 2012-03-21 | 2013-10-01 | 경기대학교 산학협력단 | SYNTHESIS OF 4-SUBSTITUTED CHIRAL CHROMANOLS BY USING MALONIC ESTER AND O-HYDROXYAROMATIC α,β-UNSATURATED ALDEHYDES |
-
2015
- 2015-09-17 KR KR1020150131342A patent/KR20170033921A/en not_active Application Discontinuation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130106908A (en) | 2012-03-21 | 2013-10-01 | 경기대학교 산학협력단 | SYNTHESIS OF 4-SUBSTITUTED CHIRAL CHROMANOLS BY USING MALONIC ESTER AND O-HYDROXYAROMATIC α,β-UNSATURATED ALDEHYDES |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019124837A1 (en) * | 2017-12-24 | 2019-06-27 | 주식회사 포스코 | Highly electrically conductive and high strength copper alloy and manufacturing method thereof |
| WO2019172564A1 (en) * | 2018-03-09 | 2019-09-12 | 블루메탈(주) | Copper-ferrous alloy cable having high shielding property |
| KR20190106359A (en) * | 2018-03-09 | 2019-09-18 | 블루메탈(주) | Copper-ferrous alloy cable having magnetic high shield and method thereof |
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