WO2018135575A1 - Corps poreux en cuivre, élément composite poreux en cuivre, procédé de production de corps poreux en cuivre et procédé de production d'élément composite poreux en cuivre - Google Patents

Corps poreux en cuivre, élément composite poreux en cuivre, procédé de production de corps poreux en cuivre et procédé de production d'élément composite poreux en cuivre Download PDF

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Publication number
WO2018135575A1
WO2018135575A1 PCT/JP2018/001370 JP2018001370W WO2018135575A1 WO 2018135575 A1 WO2018135575 A1 WO 2018135575A1 JP 2018001370 W JP2018001370 W JP 2018001370W WO 2018135575 A1 WO2018135575 A1 WO 2018135575A1
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WIPO (PCT)
Prior art keywords
copper
copper porous
porous body
composite member
fibers
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PCT/JP2018/001370
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English (en)
Japanese (ja)
Inventor
純 加藤
喜多　晃一
俊彦 幸
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三菱マテリアル株式会社
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Application filed by 三菱マテリアル株式会社 filed Critical 三菱マテリアル株式会社
Priority to US16/468,020 priority Critical patent/US20190381568A1/en
Priority to CN201880003797.7A priority patent/CN109803778A/zh
Priority to KR1020197017146A priority patent/KR20190108103A/ko
Priority to EP18741976.7A priority patent/EP3572169A4/fr
Publication of WO2018135575A1 publication Critical patent/WO2018135575A1/fr

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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
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/002—Manufacture of articles essentially made from metallic fibres
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B22F3/1103—Making porous workpieces or articles with particular physical characteristics
    • 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
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/08—Alloys with open or closed pores
    • 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
    • B22F1/06—Metallic powder characterised by the shape of the particles
    • B22F1/062—Fibrous particles
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
    • Y10T428/12042—Porous component

Definitions

  • the present invention relates to a copper porous body made of copper or a copper alloy, a copper porous composite member obtained by bonding the copper porous body to a member body, a method for producing a copper porous body, and a copper porous composite.
  • the present invention relates to a method for manufacturing a member.
  • Patent Document 1 proposes a heat transfer member in which a copper porous body forming a three-dimensional network structure is integrally attached to a conductive metal member body.
  • the three-dimensional network structure for example, urethane foam, which consists of a material burned down by heating
  • Polyethylene foam synthetic resin foam with continuous cells, natural fiber cloth, man-made fiber cloth, etc.
  • Patent Document 1 when a metal sintered body (copper porous sintered body) is formed using a metal powder, the shrinkage rate during sintering is large. There was a problem that it was difficult to obtain a copper porous sintered body having high strength and high porosity.
  • Patent Documents 2 and 3 a copper porous body using copper fibers made of copper or a copper alloy as a sintering raw material has been proposed.
  • Patent Document 2 discloses a method for obtaining a copper porous body by conducting energization heating of copper fibers under pressure.
  • Patent Document 3 discloses a method of obtaining a copper porous body by heating copper fibers to 800 ° C. in an air atmosphere and then heating to 450 ° C. in a hydrogen atmosphere.
  • the present invention has been made against the background as described above, and has a high porosity and a sufficient strength, a copper porous body in which the copper porous body is bonded to a member main body. It aims at providing the manufacturing method of a composite member, a copper porous body, and the manufacturing method of a copper porous composite member.
  • the copper porous body of the present invention comprises a sintered body of a plurality of copper fibers and has a three-dimensional network structure skeleton portion.
  • the copper fiber forming the skeleton is made of copper or a copper alloy, the diameter R is in the range of 0.01 mm to 1.0 mm, and the ratio L / L of the length L to the diameter R is L / R is in the range of 4 or more and 200 or less, the circularity of the cross section orthogonal to the longitudinal direction is in the range of 0.2 or more and 0.9 or less, and the porosity is 50% or more and 95% or less. It is characterized by being within the range.
  • the diameter R of the copper fiber forming the skeleton is in the range of 0.01 mm to 1.0 mm, and the ratio L / R of the length L to the diameter R is L / R. Is in the range of 4 or more and 200 or less, a sufficient gap is secured between the copper fibers, and the porosity can be in the range of 50% or more and 95% or less.
  • skeleton part is prescribed
  • the circularity C is expressed by the following equation, where A is the cross-sectional area of the copper fiber and Q is the circumferential length of the cross-section of the copper fiber.
  • Circularity C (4 ⁇ A) 0.5 / Q
  • the circularity C is 1, and when the cross-sectional shape is a concave polygon such as a star or a rectangle with a large aspect ratio, the circularity C approaches 0.
  • the circularity of the cross section of the copper fiber forming the skeleton is in the range of 0.2 or more and 0.9 or less, the copper fibers are in surface contact when the copper fibers are laminated.
  • the number of parts to be increased the contact area between the laminated copper fibers can be secured, the bonding strength between the copper fibers can be improved, and a void can be secured between the copper fibers, and the porosity Can be increased. Therefore, it is possible to provide a copper porous body having high porosity and sufficient strength.
  • the copper porous composite member of the present invention is a copper porous composite member comprising a joined body of a member main body and a copper porous body having a three-dimensional network structure skeleton, wherein the copper porous body is the above-mentioned copper porous body. It is characterized by being a copper porous body. According to the copper porous composite member having this configuration, a porous composite member having excellent characteristics is provided since it is a joined body of a copper porous body having a high porosity and excellent strength and a member main body. be able to.
  • the joint surface of the member main body with the copper porous body is composed of copper or a copper alloy, and the joint portion between the copper porous body and the member main body. Is preferably a sintered layer.
  • the joining portion between the copper porous body and the member main body is a sintered layer, the copper porous body and the member main body are firmly joined, and the copper porous composite Excellent strength as a member can be obtained.
  • the manufacturing method of the copper porous body of this invention is a manufacturing method of the copper porous body which consists of a sintered compact of a some copper fiber, and has the frame
  • the ratio L / R of the length L to the diameter R is in the range of 4 to 200 and the circularity of the cross section perpendicular to the length direction is 0.
  • the diameter R of the copper fiber is in the range of 0.01 mm or more and 1.0 mm or less, and the ratio L / R of the length L to the diameter R is 4 or more. Since the circularity of the cross section perpendicular to the length direction is within the range of 0.2 or more and 0.9 or less, the contact area between the copper fibers is secured, A high-strength copper porous body can be obtained. Moreover, a space
  • the method for producing a copper porous composite member of the present invention is a method for producing a copper porous composite member comprising a joined body of a member main body and a copper porous body having a three-dimensional network structure skeleton. It has the joining process which joins a copper porous body and the said member main body, It is characterized by the above-mentioned.
  • the copper porous composite member manufactured by the above-described copper porous body manufacturing method is provided and has excellent properties such as strength. Can be obtained.
  • a member main body a board, a rod, a pipe
  • a joining surface to which the copper porous body is joined in the member body is made of copper or a copper alloy, and the copper porous body It is preferable to join the member main body by sintering.
  • the member main body and the copper porous body can be integrated by sintering, and a copper porous composite member having excellent characteristic stability can be manufactured.
  • a copper porous body having a high porosity and sufficient strength a copper porous composite member in which the copper porous body is joined to a member body, a method for producing a copper porous body, and A method for producing a copper porous composite member can be provided.
  • the copper porous body 10 which is 1st embodiment of this invention is demonstrated with reference to FIGS.
  • the copper porous body 10 which is this embodiment has the frame
  • the porosity P is in the range of 50% to 95%.
  • the copper porous body 10 is present embodiment, the relative normalized by density ratio D A Apparent tensile strength S (N / mm 2) tensile strength S / D A (N / mm 2) 10.0 That's it.
  • the copper fiber 11 which comprises the frame
  • skeleton part 12 consists of copper or a copper alloy
  • the diameter R shall be in the range of 0.01 mm or more and 1.0 mm or less, and ratio L / R of length L and diameter R Is in the range of 4 to 200.
  • the copper fiber 11 is comprised by C1020 (oxygen-free copper), for example.
  • the copper fiber 11 is given a shape such as twisting or bending.
  • the apparent density ratio D A is 0.50 or less of the true density D T of the copper fibers 11.
  • the gap shape between the copper fibers 11 can be formed three-dimensionally and isotropically, and as a result, the copper This leads to an improvement in the isotropy of various characteristics such as strength, heat transfer characteristics, and conductivity of the porous body 10.
  • the copper fiber 11 is adjusted to a predetermined diameter R by a drawing method, a coil cutting method, a wire cutting method, a melt spinning method, etc., and the length of the copper fiber 11 is further adjusted to satisfy a predetermined L / R. It is manufactured by cutting.
  • skeleton part 12 is made into the range whose circularity C of the cross section orthogonal to a length direction is 0.2 or more and 0.9 or less.
  • the circularity C is 1 when it is a perfect circle, and the circularity C decreases as the circumferential length Q increases with respect to the cross-sectional area A. Therefore, when the cross section is a concave polygonal shape such as a star shape or a shape having a large aspect ratio, the circularity C is reduced.
  • a graph showing the circularity C of the regular polygon is shown in FIG. 2
  • a graph showing the relationship between the aspect ratio and the circularity C in the rectangular cross section is shown in FIG.
  • skeleton part 12 shall be a substantially triangular shape.
  • the diameter R of the copper fibers 11 is set in the range of 0.01 mm or more and 1.0 mm or less.
  • the lower limit of the diameter R of the copper fiber 11 is preferably 0.03 mm or more, and the upper limit of the diameter R of the copper fiber 11 is preferably 0.5 mm or less.
  • the ratio L / R of the length L and the diameter R of the copper fibers 11 is set in the range of 4 or more and 200 or less.
  • the lower limit of the ratio L / R between the length L and the diameter R of the copper fiber 11 is preferably 10 or more.
  • the ratio L / R upper limit of the length L and the diameter R of the copper fibers 11 is preferably 100 or less.
  • the cross-sectional shape of the copper fiber 11 forming the skeleton part 12 is a concave polygonal shape such as a star shape and the circularity C is less than 0.2, the surface unevenness of the copper fiber 11 is large. The contact portion between the copper fibers 11 is not ensured at the time of filling, and the strength of the sintered copper porous body 10 may be insufficient. Further, in the cross-sectional shape of the copper fiber 11 forming the skeleton part 12, when the aspect ratio of the long side and the short side is large and the circularity C is less than 0.2, the copper fiber 11 becomes a foil shape.
  • the porosity P of the sintered copper porous body 10 may be lowered.
  • the circularity C of the cross section of the copper fiber 11 forming the skeleton part 12 exceeds 0.9, the cross-sectional shape is close to a perfect circle. Therefore, the bonding strength of the copper fiber 11 at each contact point is lowered, and as a result, the strength of the sintered copper porous body 10 may be insufficient.
  • the circularity C of the cross section of the copper fiber 11 forming the skeleton part 12 is set in the range of 0.2 or more and 0.9 or less.
  • the lower limit of the circularity C of the cross section of the copper fiber 11 forming the skeleton 12 is preferably set to 0.3 or more, and the upper limit is set to 0.00. It is preferable to set it to 85 or less.
  • the manufacturing method of the copper porous body 10 which is this embodiment is demonstrated with reference to the flowchart of FIG. 5, the process drawing of FIG.
  • the copper fibers 11 described above are spread and filled from the spreader 31 into the graphite container 32 to stack the copper fibers 11 (copper fiber laminating step S01).
  • a bulk density D P after filling is stacked a plurality of copper fibers 11 to be equal to or less than 40% of the true density D T of the copper fibers 11.
  • the copper fiber 11 bulk-filled in the graphite container 32 is charged into the atmosphere heating furnace 33 and heated and sintered in a reducing atmosphere, an inert gas atmosphere or a vacuum atmosphere (sintering step S02).
  • the heating conditions of the sintering step S02 in the present embodiment are set such that the holding temperature is 500 ° C. or higher and 1050 ° C. or lower, and the holding time is 5 minutes or longer and 600 minutes or shorter.
  • the holding temperature in the sintering step S02 is set to 500 ° C. or higher and 1050 ° C. or lower.
  • the lower limit of the holding temperature in the sintering step S02 is 600 ° C. or higher and the upper limit of the holding temperature is 1000 ° C. or lower.
  • the holding time in the sintering step S02 is set within a range of 5 minutes or more and 600 minutes or less. In order to reliably sinter the copper fiber 11, it is preferable that the lower limit of the holding time in the sintering step S02 is 10 minutes or more and the upper limit of the holding time is 180 minutes or less.
  • the atmosphere in the sintering step S02 may be a reducing gas such as hydrogen gas, RX gas, ammonia decomposition gas, nitrogen-hydrogen mixed gas, argon-hydrogen mixed gas, or nitrogen gas, argon gas, etc.
  • An inert gas may be used.
  • it is good also as a vacuum atmosphere of 100 Pa or less.
  • the sintering step S02 the sintering proceeds at the contact portion between the copper fibers 11, and the copper fibers 11 are joined together to form the skeleton portion 12.
  • the sintering step S02 is performed in a reducing atmosphere, an inert atmosphere, and a vacuum atmosphere without applying pressure as described above, the bulk shape and the surface shape of the copper fiber 11 are greatly changed.
  • the circularity C of the cross section hardly changes before and after sintering.
  • the diameter R is in the range of 0.01 mm or more and 1.0 mm or less, and the ratio L between the length L and the diameter R is L. Since the skeleton part 12 is formed by sintering the copper fiber 11 having a / R in the range of 4 or more and 200 or less, a sufficient gap is secured between the copper fibers 11, The shrinkage rate during sintering can be suppressed, the porosity P is high, and the dimensional accuracy is excellent.
  • skeleton part 12 shall be in the range of 0.2-0.9, the contact area of copper fibers 11 is ensured.
  • the copper porous composite member 100 includes a copper plate 120 (member main body) made of copper or a copper alloy, and a copper porous body 110 bonded to the surface of the copper plate 120.
  • the copper porous body 110 has a skeleton formed by sintering a plurality of copper fibers, as in the first embodiment. And in the copper porous body 110 which concerns on this embodiment, the porosity P is made into the range of 50% or more and 95% or less.
  • the copper fiber forming the skeleton is made of copper or a copper alloy
  • the diameter R is in the range of 0.01 mm to 1.0 mm
  • the ratio L / R of the length L to the diameter R is L / R.
  • the range is 4 or more and 200 or less.
  • the copper fiber is made of, for example, C1020 (oxygen-free copper).
  • skeleton part is made into the range whose circularity C of the cross section orthogonal to a length direction is 0.2 or more and 0.9 or less.
  • the copper fiber is given a shape such as twisting or bending.
  • the apparent density ratio D A is 50% or less of the true density D T of copper fibers.
  • the copper plate 120 which is a member main body is prepared (copper plate arrangement
  • copper fibers are dispersed and arranged on the surface of the copper plate 120 (copper fiber lamination step S101).
  • bulk density D P is stacked a plurality of copper fibers to be equal to or less than 40% of the true density D T of copper fibers.
  • the copper fibers stacked and arranged on the surface of the copper plate 120 are sintered to form the copper porous body 110, and the copper porous body 110 and the copper plate 120 are bonded (sintering and joining step S102).
  • the heating conditions of the sintering and joining step S102 in the present embodiment are set such that the holding temperature is 500 ° C. or higher and 1050 ° C. or lower, and the holding time is 5 minutes or longer and 600 minutes or shorter.
  • the atmosphere in the sintering and joining step S102 is a reducing atmosphere, an inert gas atmosphere, or a vacuum atmosphere, and specifically, hydrogen gas, RX gas, ammonia decomposition gas, nitrogen-hydrogen mixed gas, argon -A reducing gas such as a hydrogen mixed gas may be used, or an inert gas such as nitrogen gas or argon gas may be used. Furthermore, it is good also as a vacuum atmosphere of 100 Pa or less.
  • the copper fibers are sintered to form the copper porous body 110, and the copper fibers and the copper plate 120 are sintered, so that the copper porous body 110 and the copper plate 120 are joined. Then, the copper porous composite member 100 according to this embodiment is manufactured.
  • the circularity C of the cross section of the copper fiber constituting the copper porous body 110 is in the range of 0.2 to 0.9. Since the contact area between the copper fibers is ensured and the strength can be improved, a void can be secured between the copper fibers, and the porosity of the copper porous body 110 P can be increased. As a result, it is possible to greatly improve various characteristics such as heat exchange efficiency, water retention and evaporation efficiency when the copper porous composite member 100 is used as a heat exchange member such as an evaporator.
  • a copper fiber is laminated
  • this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention.
  • this invention is not limited to this, Even if it manufactures a copper porous body using another manufacturing equipment Good.
  • the joining method in which the sintered layer was formed in the junction part of a copper porous body and a member main body was illustrated as a desirable method, it is not limited to this, Various welding methods
  • the copper porous body and the member main body may be joined by a joining method using a laser welding method or a resistance welding method or a brazing method using a brazing material that melts at a low temperature.
  • the copper porous composite member having the structure shown in FIG. 7 is described as an example.
  • the present invention is not limited to this, and the copper having the structure shown in FIGS. 9 to 14 is used. It may be a porous composite member.
  • a copper porous composite member 200 having a structure in which a plurality of copper tubes 220 are inserted into a copper porous body 210 as a member main body may be used.
  • a copper porous composite member 300 having a structure in which a copper tube 320 curved in a U shape as a member main body is inserted into a copper porous body 310 may be used.
  • the copper porous composite member 400 of the structure which joined the copper porous body 410 to the internal peripheral surface of the copper pipe 420 which is a member main body may be sufficient.
  • the copper porous composite member 500 of the structure which joined the copper porous body 510 to the outer peripheral surface of the copper pipe 520 which is a member main body may be sufficient.
  • a copper porous composite member 600 having a structure in which a copper porous body 610 is joined to the inner peripheral surface and the outer peripheral surface of a copper tube 620 that is a member main body may be used.
  • the copper porous composite member 700 of the structure which joined the copper porous body 710 to both surfaces of the copper plate 720 which is a member main body may be sufficient.
  • a copper porous composite member 800 having a structure in which a copper porous body 810 is joined to the inner diameter of a copper tube 820 that is a member main body may be used.
  • tube 920 which is a member main body may be sufficient.
  • a copper porous sintered body having a width of 30 mm, a length of 200 mm, and a thickness of 5 mm was manufactured using the sintering raw material (copper fiber) shown in Table 1 by the manufacturing method described in the above embodiment.
  • the diameter R of the copper fiber used as a raw material, the ratio L / R of the length L to the diameter R, and the circularity C were measured as follows.
  • skeleton part, ratio L / R of length L and diameter R, circularity C, porosity, and tensile strength was as follows. The evaluation results are shown in Table 2.
  • the length L of the copper fiber is calculated by performing image analysis on the copper fiber used as a sintering raw material and the copper fiber taken out of the copper porous sintered body using a particle analyzer “Morphology G3” manufactured by Malvern. A simple average value was used. Using this, the ratio L / R between the length L and the diameter R was calculated.
  • Circularity C of cross section Sections perpendicular to the length direction of the copper fibers taken out of the sintered raw material and the copper porous sintered body were observed with an optical microscope, and were calculated by image processing using the photographed images. It calculated with the following formula
  • equation using the area A (mm ⁇ 2 >) and the simple average value of perimeter length Q (mm). Circularity C (4 ⁇ A) 0.5 / Q
  • Porosity P The true density D T (g / cm 3 ) was measured by an underwater method using a precision balance, and the porosity P was calculated by the following equation.
  • the mass of the copper porous sintered body was m (g), and the volume of the copper porous sintered body was V (cm 3 ).
  • Porosity P (%) (1 ⁇ (m / (V ⁇ D T ))) ⁇ 100
  • the copper fiber as the sintering raw material and the copper fiber taken out from the copper porous sintered body had a diameter R, a length L and a diameter R. It was confirmed that the ratio L / R and the circularity C of the cross section did not change greatly.
  • Comparative Example 1 in which the diameter R of the copper fiber is 0.008 mm and Comparative Example 2 in which the diameter R of the copper fiber is 1.20 mm, the tensile strength of the copper porous sintered body is low. It is confirmed that In Comparative Example 3 in which the ratio L / R between the length L and the diameter R of the copper fibers was 2, the porosity P was as low as 46%. Furthermore, in Comparative Example 4 in which the ratio L / R between the length L and the diameter R of the copper fibers is 300, the strength is low. This is presumed to be due to the presence of a portion having a large gap in part and a significant reduction in strength locally.
  • Comparative Example 5 in which the circularity C of the cross section of the copper fiber was 0.95, the tensile strength was low. It is presumed that the shape of the cross section is close to a perfect circle and the contact between the copper fibers is a point contact.
  • Comparative Example 6 in which the shape of the cross section of the copper fiber was a star and the circularity C was 0.15, the tensile strength was low. It is presumed that the unevenness on the surface of the copper fibers is large, and the number of contact points between the copper fibers is reduced.
  • Comparative Example 7 in which the cross-sectional shape of the copper fiber was rectangular and the circularity C was 0.18, the porosity was low. It is presumed that the cross-sectional shape of the copper fiber was foil-like and no gap was formed between the copper fibers.
  • the porosity was as high as 50% or more and the tensile strength was sufficiently ensured. From the above, according to the present invention, it was confirmed that a high-quality copper porous sintered body having high porosity and sufficient strength can be provided.

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  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un corps poreux en cuivre qui est composé d'un corps fritté comprenant une pluralité de fibres de cuivre, et qui a une partie squelette ayant une structure de réseau tridimensionnel. Le corps poreux en cuivre selon l'invention est caractérisé en ce que : les fibres de cuivre constituant la partie squelette sont formées à partir de cuivre ou d'un alliage de cuivre et ont un diamètre R dans la plage de 0,01 mm à 1,0 mm (inclus) et un rapport de la longueur L au diamètre R, à savoir un rapport L/R dans la plage de 4 à 200 (inclus) ; et les sections transversales des fibres de cuivre, lesdites sections transversales étant orthogonales à la direction de la longueur, ont des circularités dans la plage de 0,2 à 0,9 (inclus) ; et la porosité est dans la plage de 50 % à 95 % (inclus).
PCT/JP2018/001370 2017-01-18 2018-01-18 Corps poreux en cuivre, élément composite poreux en cuivre, procédé de production de corps poreux en cuivre et procédé de production d'élément composite poreux en cuivre WO2018135575A1 (fr)

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US16/468,020 US20190381568A1 (en) 2017-01-18 2018-01-18 Copper porous body, copper porous composite member, method for producing copper porous body, and method for producing copper porous composite member
CN201880003797.7A CN109803778A (zh) 2017-01-18 2018-01-18 铜多孔体、铜多孔复合部件、铜多孔体的制造方法及铜多孔复合部件的制造方法
KR1020197017146A KR20190108103A (ko) 2017-01-18 2018-01-18 구리 다공질체, 구리 다공질 복합 부재, 구리 다공질체의 제조 방법, 및 구리 다공질 복합 부재의 제조 방법
EP18741976.7A EP3572169A4 (fr) 2017-01-18 2018-01-18 Corps poreux en cuivre, élément composite poreux en cuivre, procédé de production de corps poreux en cuivre et procédé de production d'élément composite poreux en cuivre

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JP2017006749A JP6724801B2 (ja) 2017-01-18 2017-01-18 銅多孔質体、銅多孔質複合部材、銅多孔質体の製造方法、及び、銅多孔質複合部材の製造方法

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JP2000192107A (ja) 1998-12-25 2000-07-11 Kogi Corp 多孔質金属及びその製造方法
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JP6724801B2 (ja) 2020-07-15
CN109803778A (zh) 2019-05-24
EP3572169A4 (fr) 2020-07-08
KR20190108103A (ko) 2019-09-23
JP2018115370A (ja) 2018-07-26
US20190381568A1 (en) 2019-12-19
EP3572169A1 (fr) 2019-11-27

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