WO2017052130A1 - Procédé de fabrication d'une structure métallique poreuse et structure métallique poreuse ainsi fabriquée - Google Patents

Procédé de fabrication d'une structure métallique poreuse et structure métallique poreuse ainsi fabriquée Download PDF

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Publication number
WO2017052130A1
WO2017052130A1 PCT/KR2016/010277 KR2016010277W WO2017052130A1 WO 2017052130 A1 WO2017052130 A1 WO 2017052130A1 KR 2016010277 W KR2016010277 W KR 2016010277W WO 2017052130 A1 WO2017052130 A1 WO 2017052130A1
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Prior art keywords
metal
alloy
porous
porous metal
liquid
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PCT/KR2016/010277
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English (en)
Korean (ko)
Inventor
강정윤
허회준
김상호
나혜성
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부산대학교 산학협력단
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Publication of WO2017052130A1 publication Critical patent/WO2017052130A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots

Definitions

  • the present invention relates to a method for producing a porous metal structure, and to a porous metal structure produced thereby, in particular, a process alloy structure is prepared by mixing, casting and solidifying a first metal and a second metal, and the alloy in liquid Na
  • a method of manufacturing a porous structure comprising a first metal by immersing the structure and heating to selectively dissolve the second metal in the alloy structure.
  • Porous metal is a highly functional lightweight material with high specific strength, shock absorption, sound insulation, heat insulation, and large specific surface area, compared to conventional bulk metals. It is used in a wide range of fields.
  • the present invention according to the reduced solubility of solidified upon diatomic molecular gas components in the molten metal (H 2, N 2, O 2) is a different challenge to provide a heat exchanger produced by using the porous metal casting do.
  • Lotus-type porous metal manufactured by applying unidirectional coagulation to degassing reaction, has directional pores, and has a uniform pore diameter and a pore direction in the pore diameter of several micrometers to several millimeters. It is possible to control and unlike the conventional waste hole, because the stress is not concentrated around, not only the strength characteristics are excellent, but also the thermal conductivity and the electrical conductivity in the direction parallel to the pores are excellent. In particular, porous copper has attracted attention as heat sinks of various cooling devices because its surface area is very large.
  • Methods of manufacturing a lotus type porous metal include a mold casting technique, a zone melting technique, a continuous casting technique, and the like. Porous metal production method based on this casting method is produced through the pressurization of hydrogen, melting of metal, unidirectional solidification process.
  • the conventional method for producing a porous porous metal of the lotus type is easy to control the porosity and pore diameter, but since it is necessary to use hydrogen or a mixture of hydrogen and argon at several tens of atmospheres, an expensive chamber capable of withstanding the high pressure is required. There is a problem to be equipped.
  • the present inventors have completed the present invention to form pores by selectively dissolving a metal in liquid Na to solve the problems of the prior art.
  • the present invention is to provide a method for producing a porous metal structure as a problem.
  • the alloy structure is a porous metal structure, characterized in that the first metal forms a base, the second metal is present in the first metal base, and has a two-phase structure of the first metal and the second metal. Provide a method.
  • the porous metal structure can be prepared by selectively dissolving the metal with liquid Na, and in particular, the pore size of the porous metal structure can be adjusted according to the composition and cooling rate of the first metal and the second metal. It is possible to control the pore shape of the porous metal structure, there is an effect that can form a foam-like or lotus-shaped pores.
  • the second metal used in the present invention has the effect of recovering.
  • the porous metal structure of the present invention has a large specific surface area due to the characteristics of the porous structure, heat exchangers (for vehicles, ships, plants, and electronic materials), sound absorbers, friction bearings, bumper materials, construction materials, and electronics It can be applied to materials, biomaterials, electric motors, sensors, exhaust post-treatment devices for vehicles, ships, and plants, filters and transport equipment, and heat sinks for electronic materials.
  • heat exchangers for vehicles, ships, plants, and electronic materials
  • sound absorbers for vehicles, ships, plants, and electronic materials
  • sound absorbers for vehicles, ships, plants, and electronic materials
  • sound absorbers for vehicles, ships, plants, and electronic materials
  • sound absorbers for vehicles, ships, plants, and electronic materials
  • bumper materials construction materials
  • construction materials construction materials
  • electronics for electronic materials, biomaterials, electric motors, sensors, exhaust post-treatment devices for vehicles, ships, and plants, filters and transport equipment, and heat sinks for electronic materials.
  • the method of the present invention when applied to various products manufactured using the porous metal structure, it
  • FIG. 1 is a flow chart showing a method of manufacturing a porous metal structure of the present invention.
  • Figure 2 shows a schematic diagram of the manufacturing process of the (a) foam type and (b) lotus type pores of the present invention.
  • Figure 3 is a schematic representation of the (a) phase equilibrium and (b) the solidification process of the Cu-Ag alloy and the pore shape formed according to the embodiment of the present invention.
  • the present invention relates to a method of manufacturing a porous metal structure and a porous metal structure produced by the above, and in detail, to produce an alloy structure by mixing, casting and solidifying a first metal and a second metal, the alloy structure in liquid Na It relates to a method for producing a porous metal structure consisting of the first metal by immersing and heating to selectively dissolve the second metal in the alloy structure, and a porous metal structure produced by the method and its application.
  • the structure is characterized in that the first metal forms a matrix, the second metal is present in the first metal matrix, and has a two-phase structure of the first metal and the second metal.
  • FIG. 1 is a flowchart illustrating a method of manufacturing a porous metal structure of the present invention.
  • a process alloy structure is prepared, a liquid Na is prepared, and an alloy structure is immersed and heated in the liquid Na to prepare a porous metal structure.
  • the molten alloy is injected into a mold, cooled, and solidified to produce a process alloy structure.
  • the first metal is any one metal selected from the group consisting of copper (Cu), aluminum (Al), nickel (Ni) and titanium (Ti), zirconium (Zr) and iron (Fe), 2 Metal is silver (Ag).
  • the first metal may be copper (Cu).
  • the liquid Na may be prepared by heating and melting Na to prepare a liquid Na in a molten state. Specifically, the liquid Na may be prepared by heating Na to 97 to 880 ° C. At this time, when the melting temperature of Na is less than 80 ° C., Na is not preferable because it is a solid phase.
  • the step of preparing the porous metal structure is a step of selectively dissolving the second metal in the liquid Na to form pores, the second metal to form a process by immersing the process alloy structure in the liquid Na and heating By selectively dissolving while reacting with the liquid Na to form pores, a porous structure composed of only the first metal is produced.
  • the structure is immersed in the liquid Na, it is preferable to heat to 97 to 880 °C in a vacuum atmosphere. At this time, when the said heating temperature is less than 97 degreeC, since it is solid state, it is not preferable, and when it exceeds 880 degreeC, it is not preferable because it is gaseous phase.
  • the method may further include washing the structure.
  • the structure may be immersed in alcohol and ultrasonicated to remove Na remaining in the structure.
  • the porous metal structure is characterized in that it has a foam (Foam) type or Lotus (Lotus) type pores.
  • Figure 2 is a schematic diagram showing the manufacturing method of (a) a foam (foam) -type metal and (b) a method of manufacturing a lotus-type pore structure metal.
  • an alloy structure is formed by mixing, casting, and solidifying a first metal and a second metal, and the alloy structure is immersed in liquid Na to form the alloy. Only two metals can be selectively dissolved to form a foamed porous metal structure having an open or closed shape.
  • an alloy structure is formed of a first metal and a second metal by a one-way solidification method, and the alloy structure is immersed in liquid Na to form the second metal.
  • the one-way solidification method is a bridge with a solidification technology that extends the life of the product by eliminating the transverse grain boundary, that is, the starting point of the crack, which acts perpendicular to the stress when using the existing equiaxed superheat resistant alloy turbine blade casting. It can be manufactured using a Brigman vacuum furnace.
  • the alloy structure may be a eutectic alloy cast material, by the distribution of a second metal in accordance with the composition of the first metal and the second metal and the cooling rate of the casting material in the manufacture of the eutectic alloy cast material, Alloy castings are produced in the Hypoeutectic region or the Euctectic point or Hypereutectic region.
  • the shape of the finally produced porous casting is changed according to the shape of the distribution of the second metal forming the process in the alloy casting material.
  • the casting material in the sub-process area or process point is to produce a porous metal casting of the open shape by selectively dissolving the second metal after immersion in liquid Na, the alloy casting material of the over-process area After being immersed in the liquid Na, the second metal is selectively dissolved to prepare a closed metal porous metal casting.
  • the pore shape of the porous metal casting may be controlled by controlling the composition and the cooling rate of the alloy during the manufacture of the alloy casting.
  • FIG. 3 is a schematic diagram illustrating a phase equilibrium diagram and a solidification process of a Cu-Ag alloy and pore shapes formed according to the FIG. 3, and FIG. 4 is a liquid Na immersion method according to Example 1 of the present invention. SEM pictures before and after.
  • the Cu-Ag alloy of the subprocess region is formed.
  • the copper and the silver As the mixed and cast alloy solidifies, pure silver and proeutectic silver are crystallized, and the copper and silver are crystallized into an eutectic mixture. Therefore, when the sub-alloy alloy is immersed in liquid Na, the pure silver, the ultracrystalline silver, and the eutectic silver are selectively dissolved to form an open porous metal structure.
  • the size of the pores formed at this time is 1 to 50 ⁇ m, preferably may have a pore of 5 to 10 ⁇ m.
  • the Cu-Ag alloy is formed in the overprocessed region.
  • the copper and the silver are mixed and As the cast alloy solidifies, pure copper and primary copper are crystallized, and the copper and silver are crystallized into a process shape. Accordingly, when the hypereutectic alloy is immersed in liquid Na, the eutectic silver is selectively dissolved to produce a closed metal porous structure.
  • the heating temperature is characterized in that 97 to 880 °C, preferably 350 °C. If the heating temperature is less than 97 ° C, it is not preferable because Na is a solid phase. If the heating temperature is higher than 880 ° C, it is not preferable because Na is a gaseous phase.
  • the step of recovering the second metal by solidifying and filtering the second metal dissolved in the liquid Na.
  • the liquid Na in which silver is dissolved can be coagulated, and then washed with alcohol and filtered to recover the silver.
  • the alcohol may be used ethanol.
  • the porous metal structure manufactured according to the method of manufacturing the porous metal structure.
  • the porous metal structure has high surface area ratio and high electrical conductivity, so that the porous metal structure can be applied to an exhaust post-treatment device for a motor, a sensor, a vehicle, a ship, and a plant.
  • it has a large specific surface area due to the characteristics of the porous structure, so it can be used as a sound absorber capable of absorbing sound, a heat exchanger requiring high heat transfer, a filter for removing small solids in the gas phase or a liquid phase, and a porous metal material for fuel cells. Can be.
  • An alloy structure formed of 26.7 wt% copper and 73.3 wt% silver was placed in a crucible, immersed in a predetermined amount of a liquid sodium solution, and then the crucible was placed in an STS case and heated at 350 ° C. for 24 hours in a vacuum atmosphere. After heating, the crucible was taken out to separate solidified sodium and alloy structures and solidified at room temperature. In order to wash and remove Na adhered to the alloy structure, it was immersed in methanol or ethanol and subjected to ultrasonic cleaning. After washing, a porous copper structure was obtained.
  • the porous copper structure is shown in FIG. 4.
  • the alloy structure should theoretically be formed only in the process shape, but it is determined that not only the Ag and Cu but also the amorphous form Ag are formed by the fast cooling rate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Composite Materials (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'une structure métallique poreuse, et une structure métallique poreuse ainsi fabriquée, et elle concerne plus particulièrement un procédé de fabrication d'une structure métallique poreuse comprenant les étapes suivantes consistant à : (a) fabriquer une structure d'alliage comprenant un premier métal et un second métal ; (b) faire fondre Na, ce qui permet de fabriquer du Na liquide ; et (c) immerger la structure d'alliage dans Na liquide puis les chauffer de telle sorte que le second métal est sélectivement dissous dans Na liquide, ce qui permet de fabriquer une structure métallique poreuse comprenant le premier métal, l'invention étant caractérisée en ce que la structure de l'alliage possède une matrice formée par le premier métal de telle sorte que le second métal est présent dans la première matrice métallique, et possède une structure à deux phases formée par le premier et le second métal.
PCT/KR2016/010277 2015-09-21 2016-09-12 Procédé de fabrication d'une structure métallique poreuse et structure métallique poreuse ainsi fabriquée WO2017052130A1 (fr)

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KR1020150133297A KR101759653B1 (ko) 2015-09-21 2015-09-21 다공성 금속 구조체의 제조방법, 이에 의해 제조되는 다공성 금속 구조체
KR10-2015-0133297 2015-09-21

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KR102257787B1 (ko) * 2019-11-25 2021-05-28 서울대학교산학협력단 다공성 전이 금속 합금 촉매, 다공성 전이 금속 합금 촉매의 제조 방법, 및 다공성 전이 금속 합금 촉매를 포함하는 전기 화학 시스템

Citations (5)

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Publication number Priority date Publication date Assignee Title
KR970010991A (ko) * 1995-08-24 1997-03-27 채창근 내식성 및 내마모성이 우수한 은합금 및 그의 제조방법
KR20050092332A (ko) * 2004-03-15 2005-09-21 더 유니버서티 어브 퀸슬랜드 용침 알루미늄 프리폼
US20100028710A1 (en) * 2006-04-21 2010-02-04 Metafoam Technologies Inc. Open cell porous material and method for producing same
KR20140087714A (ko) * 2012-12-31 2014-07-09 국민대학교산학협력단 메탈폼 제조방법 및 이에 의해 제조된 메탈폼
KR20150084452A (ko) * 2014-01-14 2015-07-22 인하대학교 산학협력단 다공성 동 제조 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970010991A (ko) * 1995-08-24 1997-03-27 채창근 내식성 및 내마모성이 우수한 은합금 및 그의 제조방법
KR20050092332A (ko) * 2004-03-15 2005-09-21 더 유니버서티 어브 퀸슬랜드 용침 알루미늄 프리폼
US20100028710A1 (en) * 2006-04-21 2010-02-04 Metafoam Technologies Inc. Open cell porous material and method for producing same
KR20140087714A (ko) * 2012-12-31 2014-07-09 국민대학교산학협력단 메탈폼 제조방법 및 이에 의해 제조된 메탈폼
KR20150084452A (ko) * 2014-01-14 2015-07-22 인하대학교 산학협력단 다공성 동 제조 방법

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KR101759653B1 (ko) 2017-07-19

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