WO2023228917A1 - Échangeur de chaleur et procédé pour la fabrication de celui-ci - Google Patents

Échangeur de chaleur et procédé pour la fabrication de celui-ci Download PDF

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Publication number
WO2023228917A1
WO2023228917A1 PCT/JP2023/019015 JP2023019015W WO2023228917A1 WO 2023228917 A1 WO2023228917 A1 WO 2023228917A1 JP 2023019015 W JP2023019015 W JP 2023019015W WO 2023228917 A1 WO2023228917 A1 WO 2023228917A1
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Prior art keywords
mass
brazing
content
material layer
less
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PCT/JP2023/019015
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English (en)
Japanese (ja)
Inventor
元彦 今井
紀之 古池
一崇 上林
孝洋 越智
政彦 長島
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マレリ株式会社
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Priority to JP2024523292A priority Critical patent/JPWO2023228917A1/ja
Publication of WO2023228917A1 publication Critical patent/WO2023228917A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular

Definitions

  • the present disclosure relates to a heat exchanger and a method for manufacturing the same.
  • Patent Document 1 discloses a method for brazing aluminum alloy members.
  • brazing is performed by performing the following steps.
  • the aluminum alloy for brazing filler metal contains Mg: 0.2 to 3.0%, Si: 3 to 12%, and if desired, Bi: 0.02 to 0.3%.
  • the balance is made up of Al and unavoidable impurities.
  • the aluminum alloy for the core material is prepared to have a composition containing Mg: 0.1 to 0.8% in mass %, and the balance consisting of Al and inevitable impurities.
  • an aluminum alloy brazing sheet for a heat exchanger in which one side of an aluminum alloy core material is clad with an aluminum alloy brazing material, is used as a cladding material in which a brazing material is superimposed on one or both sides of a core material and bonded.
  • the aluminum alloy brazing sheet and the component to be brazed are arranged such that an aluminum alloy brazing material is interposed between the aluminum alloy core material and the component to be brazed, and a silane coupling agent is further applied on the aluminum alloy brazing material. and a water-soluble modified silicone oil to form a coating film containing a paint containing the mixture. Then, these are assembled to form an aluminum alloy assembly for brazing. This allows a coating film to be interposed at the joint.
  • the assembled body is placed in a heating furnace in a non-oxidizing atmosphere without reducing the pressure.
  • the non-oxidizing atmosphere preferably has an oxygen concentration of 50 ppm or less by volume.
  • brazing is performed by heating at a temperature increase rate of 10 to 200° C./min to 590 to 610° C., for example. This brazing method is said to eliminate the need to use fluoride-based flux to remove oxides.
  • Patent Document 2 relates to a method for brazing aluminum alloy brazing sheets and a method for manufacturing a heat exchanger, and particularly describes a method for brazing without using flux, a so-called fluxless brazing method, and a method for manufacturing a heat exchanger.
  • a method of manufacturing the heat exchanger used is disclosed.
  • this brazing method an aluminum alloy brazing sheet including a core material and a brazing material is brazed.
  • the Si content of the brazing filler metal is CSi mass %
  • the Bi content of the brazing filler metal is CBi mass %
  • the Mg content of the brazing filler metal is CMg-b mass %
  • the core material of the brazing sheet is made of an aluminum alloy containing Mg: 2.0% by mass or less (including 0% by mass).
  • aluminum alloys include JIS 2000 series Al-Cu alloy, JIS 3000 series Al-Mn alloy, JIS 5000 series Al-Mg alloy, and JIS 6000 series Al-Mg- It is said that a Si-based alloy or the like can be used.
  • the core material of the brazing sheet in this brazing method may further contain Mn, Si, Cu, Fe, Ti, Cr, Zr, and Li as appropriate. It is said that the brazing sheet brazing material may further contain Mn, Ti, Cr, Zr, Zn, Sr, Na, Sb, rare earth elements, and Li as appropriate.
  • the Mg content is 0 mass% or more and 2.0 mass% or less, the Mn content is 2.5 mass% or less, the Si content is 1.2 mass% or less, Cu content is 3.0 mass% or less, Fe content is 1.5 mass% or less, Ti content is 0.5 mass% or less, Cr content is 0.5 mass% or less. , Zr content may be 0.5% by mass, and Li content may be 0.3% by mass or less.
  • the heartwood may contain one or more types of Ti, Cr, and Zr, as long as they do not exceed the above upper limit, that is, not only one type but also two or more types may be contained. There is.
  • Unavoidable impurities in the core material include V, Ni, Ca, Na, Sr, etc., V: 0.05% by mass or less, Ni: 0.05% by mass or less, Ca: 0.05% by mass or less, Na: 0 Sr: 0.05% by mass or less, other elements: less than 0.01% by mass.
  • the brazing material has a Mn content of 2.0% by mass or less, a Ti content of 0.3% by mass or less, a Cr content of 0.3% by mass or less, and a Zr content of 0.3% by mass or less. is 0.3% by mass or less, Zn content is 5.0% by mass or less, Sr content is 0.10% by mass or less, Na content is 0.050% by mass or less, Sb content is 0. It is said that the Li content may be .5% by mass or less, and the Li content may be 0.3% by mass or less.
  • Mn, Ti, Cr, and Zr in the brazing filler metal must not exceed the above upper limits, not only when the brazing filler metal contains one or more types, but also when it contains two or more types.
  • the brazing filler metal may contain one or more types of Sr, Na, and Sb, as long as they do not exceed the upper limit values above. has been done.
  • the brazing filler metal may contain one kind or two or more kinds. For example, Sc, Y, La, Ce, Nd, Dy, etc. may be added. It is said to be good.
  • unavoidable impurities in the brazing filler metal Fe: 0.35% by mass or less, Ca: 0.05% by mass or less, Be: 0.01% by mass or less, and other elements: less than 0.01% by mass. It is said that it may be contained.
  • Patent Document 3 discloses a fluxless brazing method for a heat exchanger having narrow channel inner fins and an aluminum cladding material used therein.
  • this brazing method an aluminum cladding material in which an Al-Si brazing filler metal containing 0.1 to 5.0% Mg and 3 to 13% Si by mass is located on the outermost surface is used, and reduced pressure is applied.
  • the contact area with the member to be brazed is bonded using the Al--Si brazing material.
  • the brazing material and the core material of this aluminum cladding material can be manufactured by a conventional method, and that they can be manufactured by overlaying both or another material such as a sacrificial material and rolling the cladding material.
  • the composition of the core material of this cladding material is one containing Si: 0.1 to 1.2%, Mg: 0.01 to 2.0%, Mn: 0.2 to 2.5%, Cu : 0.05 to 1.0%, Si: 0.1 to 1.2%, Fe: 0.1 to 1.0%, or Si: 0.1 to 1.2%, Mg: Contains 0.01 to 2.0%, and further contains one of Mn: 0.2 to 2.5%, Cu: 0.05 to 1.0%, Fe: 0.1 to 1.0%, or Contains two or more types, and further contains Zr: 0.01 to 0.3%, Ti: 0.01 to 0.3%, Cr: 0.01 to 0.5%, Bi: 0.01 to 1 as desired. It is disclosed that it is desirable to contain one or more types within .0%.
  • Patent Document 3 discloses that, although the inclusion of Bi in the brazing filler metal is not essential, it is possible to improve the wettability of the brazing filler metal by including Bi.
  • the Bi content should be between 0.01% and 1.0%; less than 0.01% is not preferable because the effect is insufficient, and more than 1.0% is undesirable because it saturates the effect and increases material costs. is disclosed.
  • fluxless brazing Aluminum Alloy In flux-free brazing (hereinafter referred to as fluxless brazing) of aluminum alloys, magnesium is added to the core material or brazing material in order to improve brazing properties.
  • fluxless brazing a phenomenon in which the core material is eroded by the molten brazing material (hereinafter referred to as erosion) is likely to occur.
  • Aluminum alloys are used in heat exchangers for automobiles and other vehicles to reduce weight.
  • brazing is used to join the aluminum alloys together, as described in the above-mentioned patent documents. If fluxless brazing is performed, it is not necessary to remove flux residue after brazing, thereby improving the productivity of the heat exchanger.
  • members made of aluminum alloy be made thinner in order to reduce weight.
  • fluxless brazing generally has narrow operating conditions under which erosion-free brazing can be achieved. Therefore, it may not be possible to stably manufacture a heat exchanger by fluxless brazing. Therefore, it may be difficult to improve productivity, reduce weight, and improve durability of the heat exchanger.
  • the present disclosure has been made in view of the above circumstances, and its purpose is to provide a heat exchanger in which the occurrence of erosion is suppressed by fluxless brazing, and a method for manufacturing the same.
  • the heat exchanger for achieving the above object includes: comprising a plate-shaped flow path forming member through which fluid flows;
  • the flow path forming member is A core material layer; a brazing metal layer; a diffusion layer formed between the core material layer and the brazing material layer,
  • the core material layer is The content of magnesium is 0.5% by mass or more and 0.75% by mass or less,
  • the content of manganese is 1.0% by mass or more and 2.5% by mass or less,
  • the content of silicon is 0.2% by mass or less, aluminum alloy
  • the brazing material layer is The content of magnesium is 0% by mass or more and 0.9% by mass or less,
  • the manganese content is 1.0% by mass or less and less than the manganese content of the core material layer,
  • the content of silicon is 8% by mass or more and 12.0% by mass or less, aluminum alloy
  • the diffusion layer is a region in which the manganese content exceeds the manganese content of the brazing material layer, and the silicon content exceeds the silicon content contained in the core
  • a method for manufacturing a heat exchanger according to the present disclosure for achieving the above object includes: A method for manufacturing a heat exchanger in which a flow path forming member having a brazing material layer disposed on one surface of a core material layer and a second member are brazed, the method comprising: The core material layer, The content of magnesium is 0.5% by mass or more and 0.75% by mass or less, The content of manganese is 1.0% by mass or more and 2.5% by mass or less, The content of silicon is 0.2% by mass or less, aluminum alloy, The brazing material layer, The content of magnesium is 0% by mass or more and 0.9% by mass or less, The manganese content is 1.0% by mass or less and less than the manganese content of the core material layer, The content of silicon is 8% by mass or more and 12.0% by mass or less, aluminum alloy, The second member, The content of magnesium is 0.5% by mass or more and 0.75% by mass or less, The content of manganese is 1.0% by mass or more and 2.5% by mass or less, The content
  • FIG. 2 is a sectional view taken along the line II-II in FIG. 1.
  • FIG. FIG. 2 is a partially enlarged cross-sectional view of a brazed portion between a tube and a fin (portion A in FIG. 1). It is an explanatory view of the layer structure of a brazing sheet. It is an explanatory view of a sheet material.
  • FIG. 3 is a partially enlarged view of a cross section of a second joint.
  • FIG. 3 is an explanatory diagram of measurement points.
  • FIG. 3 is an explanatory diagram of the structure of the specimen.
  • FIG. 3 is an explanatory diagram of a specimen after brazing treatment.
  • FIG. 3 is a diagram showing the relationship between magnesium content and silicon content at measurement points.
  • FIG. 1 shows an enlarged portion of a core 100 of a heat exchanger according to the present embodiment.
  • FIG. 2 shows a sectional view taken along the line II-II in FIG.
  • the core 100 includes a tube 3 (an example of a flow path forming member) and a fin 4 (an example of a flow path forming member, an example of a second member).
  • the core 100 is formed by brazing the fins 4 to the tube 3.
  • FIG. 3 shows an enlarged view of the brazed portion between the tube 3 and the fin 4 (section A in FIG. 1).
  • the tube 3 is a flow path forming member that forms a flow path 30 through which a fluid (heat medium) flows.
  • a flow path 40 through which a fluid (another heat medium) flows is formed outside the tube 3 .
  • the tube 3 is a heat transfer member that transfers the heat of the fluid flowing through the flow path 30 to the fluid flowing through the flow path 40 via the fins 4 .
  • fluids that can serve as heat carriers include air, water, aqueous solutions (specifically, antifreeze), organic solvents, and oil.
  • the tube 3 is formed of an aluminum alloy brazing sheet (hereinafter simply referred to as the brazing sheet 1) having a core material layer 11 and a brazing material layer 12.
  • the brazing sheet 1 aluminum alloy brazing sheet having a core material layer 11 and a brazing material layer 12.
  • the tube 3 is formed by, for example, bending the brazing sheet 1 into an annular shape.
  • the tube 3 is formed by bending the brazing sheet 1 so that the brazing material layer 12 (see FIGS. 1 and 4) is disposed at a radially outer position in the annular shape.
  • the tube 3 is formed by overlapping the brazing material layer 12 at the first (one) end 1a and the brazing material layer 12 at the second (other) end 1b of the brazing sheet 1.
  • the end portion 1a and the second end portion 1b are joined by brazing.
  • the portion of the tube where the first end portion 1a and the second end portion 1b are joined by brazing will be referred to as a first joint portion 51.
  • the fins 4 are formed by, for example, bending an aluminum alloy plate material (see FIG. 5, hereinafter simply referred to as a sheet material 2) into a corrugated plate shape.
  • the fin 4 is a so-called corrugated fin.
  • the fins 4 are arranged in the flow path 40 (see FIG. 1).
  • the fins 4 are heat transfer members that transmit the heat of the tube 3 to the fluid flowing through the flow path 40, and are flow path forming members that partition the flow path 40.
  • the outer peaks 41 of the ridges in the corrugated bent shape of the fins 4 and the brazing material layer 12 (see FIGS. 1 and 4) side of the tube 3 are joined by brazing.
  • the portion of the core 100 where the top portion 41 of the fin 4 and the brazing material layer 12 side of the tube 3 are joined by brazing will be referred to as a second joint portion 52.
  • the first joint portion 51 and the second joint portion 52 may be formed at the same or adjacent positions. That is, the second joint portion 52 may be formed by brazing the top portion 41 of the fin 4 to the first joint portion 51 at a radially outer position of the tube 3 . In this way, the part where the second joint part 52 is formed in the first joint part 51 and the tube 3 and the fin 4 are joined by brazing may be particularly referred to as a third joint part 53. That is, the first joint part 51 or the second joint part 52 may include the third joint part 53, and the third joint part 53 is the first joint part 51 and the second joint part 52. Below, the first joint part 51, the second joint part 52, and the third joint part 53 may be collectively referred to simply as a joint part.
  • a fillet 34 is formed at the portion where the tube 3 and the fin 4 are separated, as shown in FIGS. 1 to 3.
  • the fillet 34 is formed by the surface tension of the brazing material in the portion where the tube 3 and the fin 4 are separated from each other at the joint where the brazing material in the brazing material layer 12 (see FIG. 3) melts and flows. Formation of a fillet 34 of an appropriate size indicates proper flow of the brazing material and is indicative of a successful brazing.
  • brazing sheet 1 (see FIGS. 1, 2, and 4) forming the tube 3, the sheet material 2 forming the tube 3, the fins 4 (see FIG. 5), the fins 4, and the joint portion will be described in detail.
  • the brazing sheet 1 before brazing has a two-layer structure including a core layer 11 and a brazing layer 12 disposed on one surface of the core layer 11.
  • the core material layer 11 has a magnesium (Mg) content of 0.5% by mass or more and 0.75% by mass or less, a manganese (Mn) content of 1.0% by mass or more and 2.5% by mass or less, It is made of an aluminum alloy with a silicon (Si) content of 0.2% by mass or less.
  • Mg magnesium
  • Mn manganese
  • Si silicon
  • the silicon content is preferably 0.05% by mass or less.
  • the core layer 11 may contain metal elements and impurities as additives in addition to magnesium, manganese, and silicon.
  • the brazing material layer 12 has a magnesium content of 0% by mass or more and 0.9% by mass or less, a manganese content of 1.0% by mass or less, and less than the manganese content of the core material layer 11. , an aluminum alloy having a silicon content of 8% by mass or more and 12.0% by mass or less.
  • the manganese content is preferably 0.10% by mass or less. In the brazing filler metal layer 12, the content of manganese may be 0.05% by mass or more. In the brazing material layer 12, manganese is not an essential component.
  • the brazing material layer 12 may contain metals and impurities as additives in addition to magnesium, manganese, and silicon.
  • braze layer 12 may include bismuth as an additive.
  • the content of bismuth in the brazing material layer 12 is preferably 0.1% by mass or more and 1.0% by mass or less.
  • the wettability of the brazing material can be improved without being eluted from the material surface (the surface to be brazed). More preferably, the content of bismuth in the brazing material layer is 0.20% by mass or more and 0.40% by mass or less.
  • the sheet material 2 shown in FIG. 5 has a magnesium content of 0.5% by mass or more and 0.75% by mass or less, a manganese content of 1.0% by mass or more and 2.5% by mass or less, and a silicon content. It has an alloy layer made of an aluminum alloy in an amount of 0.2% by mass or less.
  • the alloy layer of the sheet material 2 may contain metals and impurities as additives in addition to magnesium, manganese, and silicon.
  • the sheet material 2 may have a two-layer structure with a second alloy layer disposed on the surface of the alloy layer.
  • the second alloy layer may be, for example, a layer similar to the brazing material layer 12 of the brazing sheet 1 (see FIG. 4, respectively). In the following description, a case where the sheet material 2 is one layer will be exemplified and explained.
  • the brazing sheet 1 (see FIGS. 1, 2, and 4) and the sheet material 2 (see FIG. 5), that is, the tube 3 and the fins 4, have a brazing material layer 12. It is brazed through. Due to the heat treatment during brazing, in the brazing sheet 1 forming the tube 3, diffusion of metal components occurs at the interface between the core material layer 11 and the brazing material layer 12 (see FIG. 4, respectively). Due to this diffusion, in the core 100, the layer structure of the brazing sheet 1 before brazing and the brazing sheet 1 (ie, tube 3) after brazing has changed.
  • the explanation of the layered structure of the tube 3 in the following description is, in other words, the explanation of the layered structure of the brazing sheet 1 after brazing. In the following description, including the case where the brazing sheet 1 after brazing is described, it will be referred to as a tube 3. Furthermore, when simply referred to as the brazing sheet 1, it refers to the brazing sheet 1 before brazing.
  • FIG. 6 shows a partially enlarged cross-sectional view of the second joint 52, which is the joint between the tube 3 and the fin 4.
  • the tube 3 has a diffusion layer 13 formed near the surface of the core layer 11 on the side that is in contact with the brazing material layer 12.
  • the fins 4 since the sheet material 2 forming the fins 4 and the tube 3 are made of the same aluminum alloy as the core material layer 11, the fins 4 also have a portion near the surface on the side in contact with the brazing material layer 12.
  • a diffusion layer 23 is formed.
  • the diffusion layer 23 is similar to the diffusion layer 13. In the following description, the description regarding the diffusion layer 13 also applies to the diffusion layer 23.
  • the diffusion layer 13 is a region where the manganese content exceeds the manganese content of the brazing material layer 12 and the silicon content exceeds the silicon content included in the core material layer 11.
  • the magnesium content (mass%) at a measurement point 45 ⁇ m away from the brazing material layer 12 toward the core layer 11 is expressed as Ym, and the silicon content (mass%) as Xs. Then, the following equations (1) to (4) are satisfied at the measurement point. Note that the measurement point is the same for any of the first joint 51, second joint 52, and third joint 53 (see FIG. 2).
  • the measurement point is in the direction along the perpendicular line S of the interface 14 between the brazing filler metal layer 12 and the diffusion layer 13, and is 45 ⁇ m (distance) from the interface 14 to the core layer 11 side. d) It is a remote point (the position indicated by the imaginary line P in FIG. 7).
  • this measurement point is the boundary line between the brazing material layer 12 and the diffusion layer 13 (same as the boundary surface 14 in FIG. 7) on the cut surface of the tube 3 perpendicular to the core material layer 11. (same as the perpendicular line S in FIG. 7), and is a point 45 ⁇ m away from the boundary line toward the core material layer 11 side.
  • the magnesium content and silicon content in the diffusion layer 13 are determined by EPMA line analysis of a cut surface of the tube 3 perpendicular to the core material layer 11 from the brazing material layer 12 side. This is a value measured by scanning toward the layer 11 side.
  • the core 100 shown in FIGS. By using the brazing sheet 1 described above and brazing so that the above formulas (1) to (4) are satisfied at the measurement point, the core 100 shown in FIGS.
  • the occurrence of erosion due to fluxless brazing is suppressed.
  • the above equations (1) to (4) are satisfied also at the measurement points in the joint, so that the occurrence of erosion is suppressed also in the joint. Furthermore, the durability of the heat exchanger is further improved by suppressing the occurrence of erosion at the joints.
  • the core 100 (heat exchanger) in which the occurrence of erosion is suppressed is realized by a heat exchanger manufacturing method including, for example, the following brazing method. That is, the sheet material 2 is heated in a state in which it is in contact with the brazing sheet 1, and the temperature increase rate when raising the temperature from 400°C to 577°C is set to a temperature of 50°C per minute or more.
  • the core 100 (heat exchanger) according to this embodiment can be manufactured by a heat exchanger manufacturing method including a brazing method using a rising rate. Note that a temperature increase rate of 50° C./min or more means increasing the temperature at least 50° C./min or more.
  • a temperature increase rate of less than 50° C. per minute is not preferable because the brazing processing speed decreases, thereby reducing the productivity of the heat exchanger.
  • a temperature increase rate of less than 50°C per minute it takes time for the temperature to rise, so the amount of diffusion of metal components accompanying brazing at the interface between the core material layer 11 and the brazing material layer 12 (see FIG. 4) This is undesirable because it may increase (excessive diffusion) and prevent proper brazing.
  • normal temperature in this embodiment refers to the temperature at which the constituent materials of the heat exchanger (brazing sheet 1 and sheet material 2) are stored or handled during transportation (for example, room temperature in a processing room) at the manufacturing site of the heat exchanger. It is generally between 0°C and 50°C.
  • Approximate evaluation based on the binary system phase diagram of aluminum and silicon shows that the brazing filler metal of the brazing filler metal layer 12 specified in this embodiment starts to melt at 577°C, and at 577°C, 60% to 80% of the entire brazing filler metal melts. % is thought to melt. According to a similar evaluation, the brazing material layer 12 specified in this embodiment melts from 80% to 100% at 590° C., and it is considered that most of the brazing material can be used effectively.
  • the core material of the core material layer 11 does not melt.
  • the temperature during brazing is 600°C or less.
  • Brazing is performed using an inert gas or a reducing gas in a non-oxidizing atmosphere with an oxygen concentration of 10 ppm or less.
  • Any gas used for joining aluminum alloys can be used as the inert gas, and for example, nitrogen and argon can be suitably used.
  • Test specimens imitating the joints of the heat exchanger according to this embodiment were prepared, and brazing was The brazed state after treatment was evaluated.
  • the specimen was prepared as follows.
  • core materials were produced by changing the magnesium content and silicon content of the aluminum alloy.
  • the magnesium content of the core material was 0% by mass, 0.30% by mass, 0.50% by mass, 0.60% by mass, 0.75% by mass, or 0.90% by mass.
  • the silicon content of the core material was 0.05% by mass or less or 0.20% by mass.
  • the manganese content of the core material was set to 1.0% by mass or more and 2.5% by mass or less, and variations within this range were allowed.
  • the copper content of the core material was allowed to be 0.05% by mass or more and 0.20% by mass or less.
  • the content of zinc in the core material was allowed to be 0.10% by mass or less.
  • Other impurities in the core material were allowed in amounts of 0.05% by mass or less as individual elements, and 0.15% by mass or less as a total amount of impurities.
  • the magnesium content of the brazing filler metal was 0% by mass, 0.50% by mass, 0.60% by mass, 0.75% by mass, 0.90% by mass, or 1.00% by mass.
  • the silicon content of the brazing filler metal was 8.0% by mass, 10.0% by mass, or 12.0% by mass, as described below. Note that each brazing filler metal was formulated with 0.1% by weight of bismuth (Bi). The content of manganese was allowed to be 0.05% by mass or less.
  • the content of copper in the brazing filler metal was allowed to be 0.30% by mass or less. Further, the content of zinc and titanium in the brazing material was allowed to be 0.20% by mass or less, respectively.
  • Other impurities in the brazing filler metal were allowed to be 0.05% by mass or less as individual elements, and 0.15% by mass or less as a total amount of impurities.
  • a brazing sheet 1 was obtained by cladding a brazing material on top of the core material, and a flat test piece of a predetermined size was produced using the brazing sheet 1.
  • the thickness of the core material layer was 0.2 mm, and the thickness of the brazing material layer was 0.05 mm.
  • FIG. 8 shows the structure of the above-mentioned specimen.
  • FIG. 8 shows a specimen 200 composed of a test piece 91, an aluminum horizontal plate 92, and a spacer 93.
  • the test piece 91 and the aluminum horizontal plate 92 are in contact at a contact point 94.
  • a spacer 93 is inserted at a position 45 mm apart from the contact point 94, so that a gap C of 1 mm is formed between the test piece 91 and the aluminum horizontal plate 92.
  • Brazing was carried out in a closed atmosphere with an oxygen concentration of 10 ppm, by raising the temperature of the specimen to a predetermined temperature at a constant heating rate of 50° C./min, and holding the specimen at that temperature for a predetermined period of time.
  • the gap between the test piece and the aluminum horizontal plate is widened from the contact point between the test piece and the aluminum horizontal plate on the specimen (hereinafter simply referred to as the contact point of the specimen) toward the spacer side.
  • a fillet is formed to fill it.
  • the components of the diffusion layer magnesium, silicon, magnesium oxide (MgO)
  • the liquid phase ratio of the brazing material as an example of the degree of melting of the brazing material
  • the presence or absence of brazing defects (presence or absence of erosion) and the flow distance of the brazing metal were visually observed.
  • the brazing metal flow distance is the length of the fillet formed to fill the gap between the test piece and the aluminum horizontal plate (from the contact point of the test piece to the spacer side, in the specimen after the brazing process).
  • the length along which the fillet extends) was measured and evaluated as the brazing metal flow distance.
  • the length that the fillet extends from the contact point of the specimen to the spacer side along the test piece and the aluminum horizontal plate will be simply referred to as the brazing metal flow distance.
  • a brazing material flow distance of 20 mm or more is good. If the brazing metal flow distance is less than 20 mm, it is determined to be defective.
  • FIG. 9 shows the specimen after the brazing process when the brazing was performed well.
  • the brazing material flows from the test piece 91 so as to fill the gap C between the test piece 91 and the aluminum horizontal plate 92, and flows from the contact point 94 to the spacer 93 side.
  • a fillet 95 is formed to extend along the horizontal plate 92.
  • the distance L is the flow distance of the brazing material.
  • the components of the diffusion layer were measured at a measurement point 45 ⁇ m away from the brazing material layer to the core material layer side of the specimen after brazing treatment, that is, from the interface between the brazing material layer and the diffusion layer to the core material layer side.
  • the components at a point 45 ⁇ m away from each other are measured and evaluated using an electron beam analysis analyzer (EPMA).
  • EPMA electron beam analysis analyzer
  • the silicon and magnesium contents are evaluated.
  • the distance from the interface is the distance in the direction perpendicular to the interface, and when observing the cut surface, it is the same as the distance in the direction perpendicular to the boundary between the brazing filler metal layer and the diffusion layer. be.
  • the distance from the interface when observing the cut surface is the same as the distance along the thickness direction of the test piece from the boundary line between the brazing material layer and the diffusion layer.
  • the boundary surface and diffusion layer are specified as follows.
  • an EPMA line analysis quantitative analysis was performed on the cut surface of the test piece perpendicular to the core material layer from the brazing material layer side to the core material layer side in the thickness direction of the test piece. Changes in the concentration of magnesium (Mg) and manganese (Mn) are measured.
  • the direction from the brazing material layer side to the core material layer side in the thickness direction of the test piece may be simply referred to as depth or depth direction.
  • an electron beam probe microanalyzer manufactured by JEOL Co., Ltd., model: JEOL JXA-8530F
  • a calibration curve method was used to quantify the elements.
  • the acceleration voltage was 20 kV
  • the sample current value was 100 nA.
  • a TAP thallium phthalate
  • the distance between the sample and the spectroscopic crystal was 107.513 mm.
  • a LIF lithium fluoride, LIFH crystal was used as a spectroscopic crystal, and the distance between the sample and the spectroscopic crystal was 146.141 mm. Note that the lower limit of detection is 0.01 to 0.05% for light elements.
  • FIG. 10 shows an example of the measurement results of an EPMA line analysis performed along the depth direction of the test piece from the brazing material layer toward the core material layer regarding the concentration of manganese.
  • manganese is expressed as Mn.
  • the horizontal axis is the depth of the test piece, and the left vertical axis is the count number in EPMA line analysis.
  • the vertical axis on the right side is the concentration of manganese (% by weight) derived from the count number.
  • the boundary surface (boundary line) between the brazing metal layer and the diffusion layer is determined by smoothing this graph, finding the differential value of the graph, finding the position of the maximum depth of this differential value, and determining this as the brazing metal layer. It can be specified as the boundary surface (boundary line) with the diffusion layer. Smoothing can be performed, for example, by selecting the minimum value between 45 ⁇ m in the depth direction (150 measurements of EPMA line analysis in the case of FIG. 10) and graphing it (see FIG. 11).
  • the differential value of the graph can be obtained by calculating an approximate function, differentiating it mathematically, and then graphing the differential expression to find the position where the differential value shows the maximum value.
  • portion B in the figure is identified as the boundary surface.
  • 10 to 12 show the ranges of the brazing material layer, core material layer, and boundary layer specified based on the boundary surface determined in FIG. 12.
  • the boundary layer is a range in the graph that includes part B where the boundary surface is identified in FIG.
  • magnesium diffuses and moves from the core material layer side to the brazing material layer
  • silicon diffuses and moves from the brazing material layer to the core material layer. do.
  • manganese is an element that is difficult to diffuse and move during the brazing process.
  • Silicon is an atom that is contained more in the brazing material layer than in the core material layer. For this reason, when scanning in the thickness direction using EPMA line analysis, silicon in the brazing filler metal layer diffuses toward the core layer to a depth where more silicon is observed than in the core layer before brazing. This means that
  • Manganese is an atom that is contained more in the core material layer than in the brazing material layer. Therefore, when scanning in the thickness direction by EPMA line analysis, the depth position where the detected amount of manganese begins to increase is the interface between the core material layer and the brazing material layer.
  • the region from the above-mentioned boundary surface to the depth position in the core material layer where more silicon is observed than in the core material layer before brazing is the diffusion layer in this embodiment.
  • the reason for evaluating the components of the above measurement point (a point 45 ⁇ m away from the boundary surface toward the core material layer side) for the diffusion layer is as follows. That is, prior to the evaluation of the examples, brazing was performed by varying the thickness of the brazing material layer of the test piece, and the components of the diffusion layer of the test piece that had been successfully brazed were analyzed by EPMA line analysis. Evaluated by.
  • the silicon content of the brazing material layer and the silicon content of the core material layer are If the ratio is constant, at a depth of 45 ⁇ m or more from the boundary surface, the silicon content will be the same even if the thickness of the brazing filler metal layer is different (however, the thickness of the brazing filler metal layer is in the range of 10 ⁇ m to 150 ⁇ m). Based on the results of a preliminary evaluation that showed the value.
  • magnesium is a component that has the function of destroying the oxide film of aluminum during brazing, when evaluating the components of the diffusion layer, it is necessary to It is only necessary to be able to evaluate whether magnesium is in a state where it is easy to diffuse on the surface. Therefore, it is sufficient that the magnesium content in the diffusion layer can be evaluated at an arbitrary depth, for example, at a depth of 45 ⁇ m from the interface where the silicon content is constant regardless of the thickness of the brazing material layer. In this way, the measurement point was determined to be a point 45 ⁇ m away from the boundary surface toward the core layer side.
  • the liquid phase ratio of the brazing material was approximately calculated using the binary phase diagram of the main components, aluminum and silicon, and the temperature reached by the specimen. It is considered that if the brazing conditions are such that the liquid phase ratio of the brazing material is 80% or more, sufficient heat is input to the brazing material during the brazing process, and the brazing material can be sufficiently melted. On the other hand, if the brazing conditions are such that the liquid phase ratio of the brazing material is less than 80%, it is considered that the heat input to the brazing material is insufficient and the brazing material cannot be sufficiently melted. Therefore, a specimen under brazing conditions in which the liquid phase ratio of the brazing material is less than 80% is judged to be defective.
  • the occurrence of erosion was investigated by observing the state of the diffusion layer of each specimen using an optical microscope. A sample with no erosion is considered good. Brazing conditions where the occurrence of erosion is obvious are poor.
  • 13 to 16 are examples of enlarged photographs of the state of the diffusion layer formed by changing the components of the core material layer and the brazing material layer, observed with an optical microscope.
  • Figure 13 shows a test piece using a test piece in which the core material layer contains 0.75% by mass of magnesium, and the brazing material layer contains 0.30% by mass and 12% by mass of magnesium and silicon, respectively, at a heating rate of 50°C/ It is an enlarged photograph of the diffusion layer when the temperature was raised to the final temperature of 600° C. in minutes, and then brazed by holding the final temperature of 600° C. for 3 minutes (Reference Example 1).
  • Figure 14 shows a specimen using a test piece in which the core material layer contains 0.75% by mass of magnesium, and the brazing material layer contains 0.50% by mass and 12% by mass of magnesium and silicon, respectively, at a heating rate of 50°C/ It is an enlarged photograph of the diffusion layer when the temperature was raised to the final temperature of 600° C. in minutes, and then brazed by holding the final temperature of 600° C. for 3 minutes (Reference Example 2). Note that the specimen of Reference Example 2 was created under the same conditions as specimen 19, which will be described later.
  • Figure 15 shows a test piece using a test piece in which the core material layer contains 0.75% by mass of magnesium, and the brazing material layer contains 0.75% by mass and 12% by mass of magnesium and silicon, respectively, at a heating rate of 50°C/ It is an enlarged photograph of the diffusion layer when the temperature was raised to the final temperature of 600° C. in minutes, and then brazed by holding the final temperature of 600° C. for 3 minutes (Reference Example 3). Note that the specimen of Reference Example 3 was created under the same conditions as specimen 8, which will be described later.
  • Figure 16 shows a test piece using a test piece in which the core material layer contains 0.75% by mass of magnesium, and the brazing material layer contains 1.00% and 12% by mass of magnesium and silicon, respectively, at a heating rate of 50°C/ It is an enlarged photograph of the diffusion layer when the temperature was raised to the final temperature of 600° C. in minutes, and then brazed by holding at the final temperature of 600° C. for 3 minutes (Reference Example 4).
  • Tables 1-1 and 1-2 show the brazing conditions and evaluation results of the specimens that were evaluated.
  • Table 1-1 shows the brazing conditions and evaluation results for specimens 1 to 10
  • Table 1-2 shows the brazing conditions and evaluation results for specimens 11 to 22. .
  • Table 1-1 and Table 1-2 are collectively referred to as Table 1.
  • magnesium is expressed as Mg and silicon is expressed as Si.
  • the row of "components of test piece" shows the prescribed amount of magnesium in the core material layer and the prescribed amounts of magnesium and silicon in the brazing material layer.
  • the row of "components at measurement points” shows the reached temperature as the temperature condition during brazing, and the content of silicon and magnesium at the measurement points as the measurement results after brazing.
  • the temperature increase rate for all specimens was 50° C./min, and the holding time after reaching the final temperature was 3 minutes.
  • results shows the liquid phase ratio of the brazing filler metal, the presence or absence of erosion, the flow distance of the brazing filler metal, and the overall evaluation.
  • the flow distance of the brazing filler metal indicates the measured flow distance of the brazing filler metal. If the brazing metal flow distance is less than 20 mm, it is determined to be defective.
  • specimens 5-7, 10-12, 14, 15, 17, and 19-22 are examples of this embodiment. Further, specimens 1-4, 8, 9, 13, 16 and 18 are comparative examples.
  • Erosion mainly occurs when the melting point of the core material (diffusion layer) decreases and the core material melts due to the diffusion of the brazing material component.
  • magnesium and silicon affect changes in the melting point of these aluminum alloys, and changes in the amounts of other additives are influenced by magnesium and silicon. It is sufficiently small compared to the influence of silicon.
  • magnesium oxide tends to form on the surface of the test piece.
  • An increase in magnesium oxide on the surface of the test piece becomes an inhibitor of wax flow.
  • magnesium is a component that has the function of destroying the aluminum oxide film during brazing, so the conditions that are most unfavorable to destroying the aluminum oxide film (conditions in which the amount of magnesium diffused onto the surface of the test piece is the least) are is a material formulation in which magnesium is added only to the core layer.
  • the order of creation and evaluation of specimens does not match the number of specimens.
  • specimens 8, 12, 15, 16, 17, 19, and 20 were manufactured and evaluated in advance, focusing on the magnesium content of the core material layer.
  • the order of creation and evaluation of the specimens does not match and is irrelevant to the number of the specimens.
  • the magnesium content at the measurement point is considered to be determined by the balance of magnesium content between the core material layer and the brazing material layer. Therefore, it was determined that appropriate brazing could not be performed under brazing conditions in which the magnesium content of the core material layer or brazing material layer was increased compared to that of Specimens 12, 19, and 20.
  • Specimens 10, 13, 14, 15, 16, 18, and 21 shown in Table 1 have a silicon content of 8% by weight in the brazing filler metal layer, and the liquid phase ratio is low due to this silicon content. Therefore, it is considered to be an example of a specimen that requires the most severe brazing.
  • the silicon content of the brazing filler metal layer was set to 8% by weight, and the temperature reached during brazing was lowered.
  • erosion mainly occurs when the melting point of the core material (diffusion layer) decreases due to the diffusion of the brazing filler metal components, causing the core material to melt.
  • Magnesium and silicon affect the change in melting point. .
  • test specimens 8 and 19 were found to be under conditions where erosion is most likely to occur in terms of silicon content, that is, the silicon content of the brazing filler metal layer is the highest at 12% by weight, and silicon is diffused into the core material layer and the core material (diffusion This is a test specimen in which the melting point of the layer) tends to decrease. Moreover, the test specimens 8 and 19 are the test specimens under brazing temperature conditions in which the attained temperature is the highest and the core material is most likely to melt. By comparing specimens 8 and 19, we determined the boundary (upper limit) of the magnesium content at the measurement point where brazing can be performed appropriately (no erosion occurs) when the silicon content at the measurement point is approximately 0.65% by weight. Demarcated. Note that even if the results of the specimens 12 and 20 are also taken into account, similar boundaries can be identified.
  • the temperature reached is 600°C. Since erosion is not considered to occur in the following cases, preparation and evaluation of such specimens were omitted.
  • magnesium oxide tends to form on the surface of the test piece, and as magnesium oxide increases on the surface of the test piece, it becomes a factor that inhibits the flow of the solder, resulting in poor brazing.
  • the magnesium content of the diffusion layer is determined by the balance of magnesium content between the core material layer and the brazing material layer.
  • the condition in which magnesium oxide is most likely to occur on the surface of the test piece and the brazing is likely to be defective is This is a case where magnesium is added only to the material layer. Therefore, the boundary (upper limit) of the magnesium content can be appropriately identified by checking the specimens 1, 2, 5, and 6 containing magnesium only in the brazing filler metal layer. Therefore, brazing is more advantageous than these specimens 1, 2, 5, and 6 in terms of whether or not magnesium oxide is generated. Prototype production and evaluation were omitted.
  • the silicon content of the brazing filler metal layer was 8% by weight, which is the most disadvantageous condition for brazing in terms of ease of melting of the brazing filler metal. That is, when the silicon content of the brazing material layer is higher than that of these specimens, it is considered that the brazing properties are more advantageous than those of specimens 5 and 6. Therefore, all combinations of brazing material layers and core material layers in which the diffusion layer has the same magnesium and silicon content as specimens 5 and 6 are more advantageous for brazing than specimens 5 and 6. Prototyping and evaluation of specimens that are more advantageous for brazing than those of Nos. 5 and 6 were omitted.
  • the melting point of the brazing material decreases, which is advantageous for brazing.
  • the lower limit of the silicon content in the diffusion layer was set to 0.36% by weight. Demarcated.
  • the silicon content of the brazing material layer was 8% by weight, which is more disadvantageous for brazing.
  • brazing is considered to be advantageous in terms of improving the liquid phase ratio of the brazing filler metal. Prototype production and evaluation of the sample were omitted.
  • specimen 22 whose core material had a higher silicon content than the other specimens was fabricated and evaluated.
  • the silicon and magnesium contents at the measurement points were located within region X, and good brazing with no defects was achieved.
  • the brazing filler metal contains bismuth, as described above.
  • the content of bismuth in an aluminum alloy brazing filler metal increases, it becomes possible to improve the wettability of the brazing filler metal (for example, see Patent Document 3).
  • the content of bismuth should be between 0.01% and 1.0% by weight, less than 0.01% by weight will not have sufficient effect, and if it exceeds 1.0% by weight, the effect will be saturated and the material cost will increase. It is known that this is undesirable because it causes an increase in the amount of water (for example, see Patent Document 3).
  • the content of bismuth in the brazing filler metal is 1.0% by weight or less, even if the wettability of the brazing filler metal improves and the brazing properties improve, A decrease in flow distance cannot be expected, and there is no reason for erosion to occur.
  • the core material for example, Cu, Fe, Ti, Cr, Zr, Li, V, Ni, Ca, Na, Sr, etc.
  • the technical common knowledge of those skilled in the art e.g. Based on the well-known phase diagrams of aluminum and each of the above-mentioned elements, it is considered that the brazing property is not affected at the content that is allowed to be contained in Patent Document 2, for example.
  • the core material contains a predetermined amount of these elements that are not mentioned in the above examples, these elements will combine with the magnesium and silicon in the core material and brazing material, resulting in the loss of magnesium and silicon. No effect is expected to be significant enough to inhibit diffusion and reduce brazability.
  • brazing filler metal for example, Ti, Cr, Zr, Zn, Sr, Na, Sb, Li, Sc, Y, La, Ce, Nd, Dy, Fe, Ca, Be etc.
  • phase diagram known for aluminum for example, in the content of the level that is allowed to be contained in Patent Document 2. It is thought that it will not affect brazing properties. In other words, even if these elements not mentioned in the above examples are included in a predetermined amount in the brazing filler metal, these elements will combine with the magnesium and silicon in the core material and brazing filler metal, resulting in the loss of magnesium and silicon. No effect is expected to be significant enough to inhibit diffusion and reduce brazability.
  • the content of copper in the core material is allowed to be 0.05% by mass or more and 0.20% by mass or less. Further, the content of zinc in the core material is allowed to be 0.10% by mass or less. Further, other impurities in the core material are allowed in amounts of 0.05% by mass or less as individual elements, and 0.15% by mass or less as a total amount of impurities.
  • the content of copper in the brazing material is allowed to be 0.30% by mass or less. Further, the contents of zinc and titanium in the brazing material are each allowed to be 0.20% by mass or less. Further, other impurities in the brazing filler metal are allowed in amounts of 0.05% by mass or less as individual elements, and 0.15% by mass or less as a total amount of impurities.
  • the tube 3 is formed of the brazing sheet 1
  • the fins 4 are one layer, and are formed of the sheet material 2, which is an aluminum alloy plate material.
  • the tube 3 and the fins 4 are not limited to being formed of such materials.
  • the tube 3 may be formed from the sheet material 2 and the fins 4 may be formed from the brazing sheet 1.
  • the tube 3 and the fins 4 may be formed of the brazing sheet 1.
  • the core 100 may have any configuration as long as the tube 3 and the fins 4 are brazed together via a brazing material layer 12 (see FIG. 4).
  • the measurement point is located at a position in the diffusion layer 13 that is 45 ⁇ m away from the brazing material layer 12 toward the core layer 11 side.
  • the explanation regarding the measurement point located in the diffusion layer 13 is that the measurement point is located in the diffusion layer 23 on the surface side of the sheet material 2, which is the fin 4, in contact with the brazing material layer 12, which is the joint part. The same is true in any case. That is, in the joint portion, the measurement point located in the diffusion layer 23 at a distance of 45 ⁇ m from the brazing material layer 12 toward the core material layer 11 is also the same as the measurement point in the diffusion layer 13. However, the diffusion layer 23 near the part where the tube 3 and the fin 4 are separated is excluded. In the core 100, the equations (1) to (4) described in the above embodiments need only be satisfied at any of the joints and at any measurement point of the diffusion layer 13 or the diffusion layer 23.
  • the tube 3 is a heat transfer member that transfers the heat of the fluid flowing through the flow path 30 to the fluid flowing through the flow path 40 via the fin 4, and the fin 4 is It has been explained that it is a heat transfer member that transfers the heat of the tube 3 to the fluid flowing through the flow path 40.
  • the fins 4 are heat transfer members that transfer the heat of the fluid flowing through the flow path 40 to the fluid flowing through the flow path 30 via the tubes 3, and the tubes 3 also transfer the heat of the fins 4. It may also be a heat transfer member that communicates with the fluid flowing through the passageway 30.
  • the brazing sheet 1 has a two-layer structure including the core layer 11 and the brazing material layer 12 disposed on one surface of the core layer 11.
  • the brazing sheet 1 is not limited to such a structure.
  • the brazing sheet 1 is placed on the surface of the core material layer 11 opposite to the surface on which the brazing material layer 12 is disposed.
  • the brazing sheet 1 has a two-layer structure including the core layer 11 and the brazing material layer 12 disposed on one surface of the core layer 11.
  • the brazing sheet 1 is not limited to such a structure.
  • the core layer 11 may be formed of multiple layers.
  • the brazing material layer 12 may be formed of multiple layers. In this case, each of the layers constituting the core material layer 11 and the brazing material layer 12 may satisfy the requirements described in the above embodiment as the core material layer 11 or the brazing material layer 12.
  • the present disclosure can be applied to a heat exchanger and a method for manufacturing the same.
  • Brazing sheet 100 Core 11: Core material layer 12: Brazing material layer 13: Diffusion layer 14: Boundary surface 1a: First end 1b: Second end 2: Sheet material 200: Specimen 23: Diffusion Layer 3: Tube 30: Channel 34: Fillet 4: Fin 40: Channel 41: Top 5: Specimen 51: First joint 52: Second joint 53: Third joint 91: Test piece 92: Aluminum Horizontal plate 93: Spacer 94: Contact 95: Fillet C: Gap G: Point L: Distance P: Virtual line Q: Position R: Virtual line S: Perpendicular X: Area d: Distance

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Abstract

L'invention concerne : un échangeur de chaleur dans lequel l'apparition d'une érosion est supprimée grâce à un brasage sans flux ; et un procédé pour la fabrication de celui-ci. L'échangeur de chaleur comprend un élément formant canal en forme de plaque qui permet à un fluide de s'écouler, l'élément formant canal ayant une couche d'âme, une couche de brasage et une couche de diffusion formée entre la couche d'âme et la couche de brasage. La couche de diffusion est une région dans laquelle la teneur en magnésium dépasse la quantité de magnésium contenue dans la couche de brasage et la teneur en silicium dépasse la quantité de silicium contenue dans la couche d'âme. Lorsque la teneur en magnésium (% en masse) et la teneur en silicium (% en masse) dans la couche de diffusion à un point de mesure à 45 µm à l'opposé de la couche de brasage vers la couche d'âme sont représentées par Ym et Xs, respectivement, les expressions relationnelles ci-dessous sont satisfaites. (1) : Ym ≤ -0,31Xs + 0,71 (2) : Ym ≥ -0,44Xs + 0,58 (3) : Xs ≤ 0,375Ym2 - 0,92Ym + 0,994 (4) : Xs ≥ 0,36
PCT/JP2023/019015 2022-05-24 2023-05-22 Échangeur de chaleur et procédé pour la fabrication de celui-ci WO2023228917A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013193128A (ja) * 2012-03-23 2013-09-30 Furukawa-Sky Aluminum Corp アルミニウム合金のろう付方法
JP2018099725A (ja) * 2016-12-16 2018-06-28 株式会社神戸製鋼所 アルミニウム合金ブレージングシート
JP2019085622A (ja) * 2017-11-08 2019-06-06 株式会社Uacj ブレージングシート及びその製造方法
JP2021031755A (ja) * 2019-08-29 2021-03-01 株式会社神戸製鋼所 アルミニウム合金材、フラックスレスろう付構造体、および、フラックスレスろう付方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013193128A (ja) * 2012-03-23 2013-09-30 Furukawa-Sky Aluminum Corp アルミニウム合金のろう付方法
JP2018099725A (ja) * 2016-12-16 2018-06-28 株式会社神戸製鋼所 アルミニウム合金ブレージングシート
JP2019085622A (ja) * 2017-11-08 2019-06-06 株式会社Uacj ブレージングシート及びその製造方法
JP2021031755A (ja) * 2019-08-29 2021-03-01 株式会社神戸製鋼所 アルミニウム合金材、フラックスレスろう付構造体、および、フラックスレスろう付方法

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