WO2022138171A1 - Échangeur de chaleur, matériau de tube d'échangeur de chaleur et matériau d'ailette d'échangeur de chaleur - Google Patents

Échangeur de chaleur, matériau de tube d'échangeur de chaleur et matériau d'ailette d'échangeur de chaleur Download PDF

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Publication number
WO2022138171A1
WO2022138171A1 PCT/JP2021/045164 JP2021045164W WO2022138171A1 WO 2022138171 A1 WO2022138171 A1 WO 2022138171A1 JP 2021045164 W JP2021045164 W JP 2021045164W WO 2022138171 A1 WO2022138171 A1 WO 2022138171A1
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Prior art keywords
mass
heat exchanger
less
aluminum alloy
tube
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PCT/JP2021/045164
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English (en)
Japanese (ja)
Inventor
太一 鈴木
稜 東森
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株式会社Uacj
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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
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • 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
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
    • 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal

Definitions

  • the present invention relates to a heat exchanger, a tube material for a heat exchanger used thereto, and a fin material for a heat exchanger, a heat exchanger for a room air conditioner, a heat exchanger for a car air conditioner, and a tube material for a heat exchanger used therein.
  • fin materials for heat exchangers are used therein.
  • Aluminum alloys that are lightweight and have high thermal conductivity are often used in heat exchangers made of aluminum alloys for automobiles such as evaporators and capacitors.
  • the heat exchanger has a tube through which the refrigerant flows and fins for heat exchange between the refrigerant and the air outside the tube, and the tube and the fins are joined by brazing. Fluoride-based flux is often used for brazing between the tube and the fins.
  • the tube used in the heat exchanger for automobiles exchanges heat as described above, it is joined to the fin by brazing, and for that purpose, it is necessary to provide a brazing material on the fin side or the tube side.
  • the fin is manufactured using a clad material clad with the brazing material, but it is difficult to reduce the manufacturing cost and the material cost.
  • a technique has been proposed in which a flux layer containing Si (silicon) powder, a Zn-containing flux, and a binder is formed on the outer surface of the tube. (Patent Document 1).
  • the flux layer having the above composition all of the brazing filler metal component, Zn and the flux component can be simultaneously bonded in one bonding step. Further, since it is not necessary to provide a brazing material on the fin side, the fin can be manufactured using the bare fin material. As a result, cost reduction can be achieved.
  • Cited Document 1 Si powder is adhered to the surface of the tube material, and the Si powder and the surface layer portion of the tube material are brazed and joined by brazing generated by eutectic melting in the process of raising the temperature by brazing heating. Therefore, it is difficult to thin the tube material, and when coarse Si powder is mixed, there is a problem that the tube is dented or penetrated due to melting.
  • Patent Document 2 describes a method of using a single-layer brazing sheet instead of the above-mentioned clad brazing sheet in order to omit the steps of manufacturing a brazing sheet and manufacturing and applying a powder brazing material. There is.
  • brazing can be performed with a single-layer brazing sheet for fin materials, so that it is not necessary to arrange brazing material for both fin materials and tube materials, and a large cost reduction is possible. Become.
  • Patent Document 2 produces a relatively small amount of liquid phase as compared with the method of Patent Document 1 and the conventional method such as brazing using a clad fin material clad with a brazing material, and the fin and the tube are formed.
  • the cross-sectional area of the fillet formed between the two becomes smaller.
  • the fillet that is, the joint between the fin and the tube disappears at an early stage, so that the fin falls off from the tube surface, the heat exchange performance deteriorates, and the tube corrosion protection by the fin does not work. ..
  • an object of the present invention is a heat exchanger obtained by using a single-layer brazing sheet fin material, which suppresses excessive Zn concentration on the fillet and prevents the fillet potential from becoming excessively low. By doing so, the fins remain on the tube for a long period of time to provide a heat exchanger having excellent heat exchange performance and anticorrosion performance, and the tube material and fin material for the heat exchanger used for this. Is to provide.
  • the present invention (1) is a heat exchanger having an aluminum alloy tube through which a working fluid flows and an aluminum alloy fin metal-bonded to the tube.
  • the tube has a tube material body made of an aluminum alloy and a Zn-containing film formed on the outer surface of the tube material body and containing Zn of 1.0 to 4.5 g / m 2 in terms of atoms.
  • Formed using the heat exchanger tube material that has The fin was made of an aluminum alloy and was formed by using a fin material for a heat exchanger having a single layer and a heat bonding function at a temperature where the liquid phase ratio is 5.0% or more and 35.0% or less. It is intended to provide a heat exchanger characterized by.
  • the aluminum alloy forming the tube material body contains 0.10 to 1.20% by mass of Mn, the Ti content is 0.10% by mass or less, and the balance is It provides the heat exchanger of (1), which is an aluminum alloy composed of Al and unavoidable impurities.
  • the aluminum alloy forming the tube material body is further selected from Cu of 0.60% by mass or less, Si of 0.70% by mass or less, and Fe of 0.50% by mass or less. It is intended to provide the heat exchanger of (2), which is characterized by containing one kind or two or more kinds thereof.
  • the present invention (4) provides the heat exchanger according to any one of (1) to (3), wherein the Zn-containing film contains a flux powder made of a Zn-containing compound. be.
  • the present invention (5) provides the heat exchanger of (4), wherein the flux powder is composed of a K—Zn—F-based compound.
  • the present invention (6) provides the heat exchanger according to any one of (1) to (3), wherein the Zn-containing film contains pure Zn powder.
  • the present invention (7) provides the heat exchanger according to any one of (1) to (3), wherein the Zn-containing film is a zinc sprayed film formed by spraying zinc. ..
  • the aluminum alloy forming the fin material for the heat exchanger contains 1.00 to 5.00% by mass of Si and 0.05 to 2.00% by mass of Mn.
  • the present invention provides the heat exchanger according to any one of (1) to (7), wherein the Fe content is 2.00% by mass or less, and the alloy is an aluminum alloy composed of the balance Al and unavoidable impurities. Is.
  • the aluminum alloy forming the fin material for the heat exchanger is further divided into Mg of 2.00% by mass or less, Cu of 1.50% by mass or less, and Zn of 6.00% by mass or less. , 0.30% by mass or less Ti, 0.30% by mass or less V, 0.30% by mass or less Zr, 0.30% by mass or less Cr and 2.00% by mass or less Ni. It is intended to provide the heat exchanger of (8), which is characterized by containing a species or two or more species.
  • the aluminum alloy forming the fin material for the heat exchanger further contains Sn of 0.30% by mass or less, In of 0.30% by mass or less, and Be of 0.10% by mass or less. , 0.10% by mass or less of Sr, 0.10% by mass or less of Bi, 0.10% by mass or less of Na and 0.50% by mass or less of Ca. (8) or (9) is provided.
  • the present invention (11) is the tube material for the heat exchanger according to claim 1.
  • the present invention provides a tube material for a heat exchanger, which is formed on the outer surface of the aluminum alloy and has a Zn-containing film containing Zn of 1.0 to 4.5 g / m 2 in terms of atoms. ..
  • the present invention (12) further contains one or more selected from Cu of 0.60% by mass or less, Si of 0.70% by mass or less, and Fe of 0.50% by mass or less.
  • the present invention provides a tube material for a heat exchanger.
  • the present invention (13) provides the tube material for a heat exchanger according to (11) or (12), wherein the Zn-containing film contains a flux powder made of a Zn-containing compound. be.
  • the present invention (14) provides the tube material for a heat exchanger according to (13), wherein the flux powder is made of a K—Zn—F compound.
  • the present invention provides the tube material for a heat exchanger according to (11) or (12), wherein the Zn-containing film contains Zn powder.
  • the present invention (16) provides the tube material for a heat exchanger according to (11) or (12), wherein the Zn-containing film is a zinc sprayed film formed by a zinc sprayed layer. be.
  • the present invention (17) is the fin material for the heat exchanger according to claim 1. It contains 1.00 to 5.00% by mass of Si and 0.05 to 2.00% by mass of Mn, and has a Fe content of 2.00% by mass or less, from the balance Al and unavoidable impurities. Made of aluminum alloy Having a heat bonding function in a single layer at a temperature where the liquid phase ratio is 5.0% or more and 35.0% or less. It is intended to provide a fin material for a heat exchanger, which is characterized by the above.
  • the aluminum alloy further contains 2.00% by mass or less of Mg, 1.50% by mass or less of Cu, 6.00% by mass or less of Zn, and 0.30% by mass or less. Contains one or more selected from Ti, V of 0.30% by mass or less, Zr of 0.30% by mass or less, Cr of 0.30% by mass or less, and Ni of 2.00% by mass or less.
  • the present invention provides a fin material for a heat exchanger.
  • the aluminum alloy further contains Sn of 0.30% by mass or less, In of 0.30% by mass or less, Be of 0.10% by mass or less, and 0.10% by mass or less. It is characterized by containing one or more selected from Sr, Bi of 0.10% by mass or less, Na of 0.10% by mass or less and Ca of 0.50% by mass or less (17) or. (18) provides a fin material for a heat exchanger.
  • the present invention (20) is a heat exchanger having an aluminum alloy tube through which a working fluid flows and an aluminum alloy fin metal-bonded to the tube.
  • a heat having at least a tube material main body made of an aluminum alloy and a Zn-containing film formed on the outer surface of the tube material main body and containing Zn of 1.0 to 4.5 g / m 2 in terms of atomic value.
  • a tube material for a exchanger and a fin material for a heat exchanger which is made of an aluminum alloy and has a liquid phase ratio of 5.0% or more and 35.0% or less, and has a heat bonding function in a single layer, are combined, and then The obtained combination is heated at a temperature at which the liquid phase ratio of the fin material for the heat exchanger is 5.0% or more and 35.0% or less, and the tube material for the heat exchanger and the fin material for the heat exchanger are joined. That it was obtained It is intended to provide a heat exchanger characterized by.
  • the present invention is a heat exchanger obtained by using a single-layer brazing sheet fin material, which suppresses excessive Zn concentration on the fillet and prevents the fillet potential from becoming excessively low. Therefore, the fins remain on the tube for a long period of time to provide a heat exchanger having excellent heat exchange performance and anticorrosion performance, and to provide a tube material and fin material for the heat exchanger used for the heat exchanger. be able to.
  • the heat exchanger of the present invention is a heat exchanger having an aluminum alloy tube through which a working fluid flows and an aluminum alloy fin metal-bonded to the tube.
  • the tube has a tube material body made of an aluminum alloy and a Zn-containing film formed on the outer surface of the tube material body and containing Zn of 1.0 to 4.5 g / m 2 in terms of atoms.
  • Formed using the heat exchanger tube material that has The fin was made of an aluminum alloy and was formed by using a fin material for a heat exchanger having a single layer and a heat bonding function at a temperature where the liquid phase ratio is 5.0% or more and 35.0% or less. It is a heat exchanger that features.
  • the heat exchanger of the present invention has at least an aluminum alloy tube through which the working fluid flows and an aluminum alloy fin metal-bonded to the tube.
  • the tube is formed by using the tube material for the heat exchanger according to the present invention
  • the fin is formed by using the fin material for the heat exchanger according to the present invention. It was done. That is, in the heat exchanger tube of the present invention, the heat exchanger tube material according to the present invention is heated at a predetermined temperature and joined to the heat exchanger fin material according to the present invention.
  • the fin of the heat exchanger of the present invention is obtained by heating the fin material for a heat exchanger according to the present invention at a predetermined temperature and joining the fin material for a heat exchanger according to the present invention.
  • the heat exchanger of the present invention combines at least the tube material for the heat exchanger according to the present invention and the fin material for the heat exchanger according to the present invention, and then the obtained combination has a liquid phase ratio of the fin material of 5.
  • a region of preferably 400 ° C. or higher is heated at an average heating rate of 10 ° C./min, preferably 3 to 5 at 600 ° C. ⁇ 10 ° C. It is obtained by joining the heat exchanger tube material according to the present invention and the heat exchanger fin material according to the present invention by holding for a minute and cooling to 100 ° C. or lower.
  • the tube material for a heat exchanger according to the present invention has a tube body made of an aluminum alloy and a Zn-containing film formed on the outer surface of the tube body.
  • the tube material for a heat exchanger according to the present invention refers to a tube material before being joined to a fin material, that is, before being heat-bonded.
  • the form of the tube body is not particularly limited, and is appropriately selected according to the application and required characteristics.
  • the tube body may be an extruded multi-hole pipe formed by extrusion processing and having a plurality of refrigerant flow paths inside. Further, the tube body may have a cylindrical shape or the like.
  • the tube body is made by cutting a plate material formed by rolling to a predetermined width, forming it into a cylindrical shape by roll forming, forming it into a pipe shape by high-frequency welding or laser welding, and further forming a flat tube shape by roll forming. It may be the one that is said to be.
  • the plate material for the tube body is composed of an aluminum alloy core material for the tube body and a sacrificial anode material clad on the outer surface side of the core material. Laminated materials can also be used.
  • the plate material for the tube body is composed of an aluminum alloy core material for the tube body and a brazing material clad on the inner surface side of the core material.
  • a laminated material can also be used, and in this case, a fin material made of an aluminum alloy can be corrugated and charged into the tube to form an inner fin type tube.
  • the chemical composition of the aluminum alloy forming the tube body is not particularly limited, but contains Mn of 0.10 to 1.20% by mass, the Ti content is 0.10% by mass or less, and the balance is Al and unavoidable.
  • An aluminum alloy composed of target impurities is preferable.
  • the aluminum alloy forming the tube body can contain Mn.
  • Mn has an action of improving the strength by being dissolved in the Al (aluminum) matrix. At the same time, it also has the effect of making the electric potential noble.
  • Mn content of the aluminum alloy forming the tube body is within the above range, a sufficient strength improving effect and a potential nourizing effect in the deep part of the tube can be obtained.
  • the Mn content of the aluminum alloy forming the tube body is less than the above range, there is a concern that the desired strength cannot be satisfied.
  • the Mn content of the aluminum alloy forming the tube body is preferably 0.10 to 1.20% by mass from the viewpoint of establishing the strength, the quality of brazing, and the productivity.
  • the aluminum alloy forming the tube body can contain Ti.
  • the Ti content of the aluminum alloy forming the tube body is 0.10% by mass or less. Ti is added to the aluminum alloy for the purpose of making the structure finer during casting.
  • the Ti content of the aluminum alloy forming the tube body is within the above range, a uniform metal structure can be obtained after extrusion or rolling.
  • the Ti content of the aluminum alloy forming the tube body exceeds the above range, huge crystallization may be generated during casting, which may make it difficult to manufacture a sound tube body, and there are many extruded holes.
  • the crystallized Ti may cause friction with the die, which may reduce productivity and tool life.
  • the crystallized Ti may cause roll forming. There is a concern that cracks will occur.
  • the Ti content of the aluminum alloy forming the tube body is preferably 0.001 to 0.05% by mass.
  • the aluminum alloy forming the tube body can contain Cu.
  • the Cu content of the aluminum alloy forming the tube body is 0.60% by mass or less, preferably 0.20 to 0.60% by mass.
  • Cu has an action of improving the strength by being dissolved in the Al (aluminum) matrix. At the same time, it also has the effect of making the electric potential noble.
  • the Cu content of the aluminum alloy forming the tube body is within the above range, a sufficient strength improving effect and a potential nourizing effect in the deep part of the tube can be obtained.
  • Al—Cu precipitates may be formed, which may impair the corrosion resistance of the tube.
  • the Cu content of the aluminum alloy forming the tube body when Cu is added is more preferably 0.20 to 0.50% by mass from the viewpoint of establishing all the strength, the quality of brazing, and the productivity. be.
  • the Cu content of the aluminum alloy forming the tube body is preferably 0.20% by mass or less, and preferably 0.05% by mass or less. Especially preferable.
  • the aluminum alloy forming the tube body can contain Si.
  • the Si content of the aluminum alloy forming the tube body is 0.70% by mass or less, preferably 0.20 to 0.70% by mass or less.
  • Si has an action of improving the strength by dissolving in the Al (aluminum) matrix or forming an AlMnSi precipitate with Mn.
  • the Si content of the aluminum alloy forming the tube body is within the above range, a sufficient strength improving effect can be obtained.
  • the Si content of the aluminum alloy forming the tube body exceeds the above range, the deformation resistance during hot working is excessively increased, and the workability in extrusion or rolling is lowered, so that the tube body Productivity may decrease.
  • the Si content of the aluminum alloy forming the tube body is preferably 0.30 to 0.70% by mass from the viewpoint of establishing the strength, the quality of brazing, and the productivity.
  • the Si content of the aluminum alloy forming the tube body is preferably 0.30% by mass or less, and preferably 0.20% by mass or less. More preferred.
  • the content of Fe is permitted as long as it does not affect the effect of the present invention.
  • the Fe content of the aluminum alloy forming the tube body is preferably 0.50% by mass or less, and particularly preferably 0.40% by mass or less. preferable.
  • the Zn-containing film is formed on the outer surface of the tube body.
  • the Zn-containing film include a Zn-containing film containing a flux powder made of a Zn-containing compound, a Zn-containing film containing pure Zn, and a zinc sprayed film formed by zinc spraying.
  • the Zn-containing film refers to a film containing a zinc element, and the zinc element exists in the state of metallic zinc or zinc ions in the Zn-containing film.
  • the Zn-containing film containing the flux powder made of the Zn-containing compound contains at least the flux powder made of the Zn-containing compound and the binder.
  • the Zn-containing film containing a flux powder made of a Zn-containing compound may be, for example, a flux powder made of a Zn-containing compound, a binder, and, if necessary, a flux powder made of a Zn-free compound. It is formed by mixing and stirring with a solvent to prepare a paste-like paint, then applying the paint to the surface of the tube body by a roll coating method or the like, and then drying the paint.
  • the binder for example, an acrylic resin, a urethane resin, or the like can be used.
  • the solvent water or alcohols such as water and ethanol and isopropyl alcohol, alkyl ether alcohols such as 3-methoxy-3-methyl-1-butanol, and ketones such as methyl ethyl ketone are used.
  • a K—Zn—F compound is preferable.
  • the K—Zn—F-based compound include KZnF 3 and the like.
  • the binder is not particularly limited, and a binder that can be used to form a film containing a flux powder on the surface of an aluminum alloy material is appropriately selected in the production of a heat exchanger made of an aluminum alloy.
  • the Zn-containing film containing pure Zn powder contains at least pure Zn powder and a binder.
  • the pure Zn refers to a Zn metal having a purity of 99% by mass or more.
  • the Zn-containing film containing pure Zn powder uses, for example, a pure Zn powder, a binder, and, if necessary, a flux powder composed of a Zn-containing compound or a flux powder composed of a Zn-free compound as a solvent. It is formed by mixing and stirring to prepare a paste-like paint, then applying the paint to the surface of the tube body by a roll coating method or the like, and then drying.
  • the binder is not particularly limited, and a binder that can be used to form a film containing pure Zn powder on the surface of the aluminum alloy material is appropriately selected in the production of a heat exchanger made of an aluminum alloy.
  • the zinc sprayed film formed by zinc spraying is formed by performing Zn spraying on the outer surface of the tube body.
  • the Zn spraying method is not particularly limited, and a conventional thermal spraying method is appropriately used.
  • two Zn wires are brought close to each other, a high-pressure current is applied, an arc is discharged between the Zn wires, the tip of the Zn wire is melted, and a high-pressure inert gas is blown to blow off the Zn, and then the Zn wire is blown off.
  • a method of adhering molten Zn to the outer surface of the tube body by passing it through the tube body can be mentioned.
  • pure Zn wire is preferably used because it is easy to manufacture. Since the Zn wire is continuously sent as it melts, the arc discharge can be continued, so that a uniform zinc sprayed film can be continuously formed in the longitudinal direction.
  • the Zn-containing film contains 1.0 to 4.5 g / m 2 , preferably 1.0 to 3.5 g / m 2 of Zn in terms of atoms.
  • Zn content of the Zn-containing film is within the above range, Zn concentration in the fillet can be suppressed, so that preferential corrosion of the fillet and premature detachment of the fins can be prevented.
  • the Zn content in the Zn-containing film is less than the above range, corrosion protection by Zn on the tube surface becomes insufficient, and the tube may penetrate at an early stage at a site such as between fins, and also.
  • the Zn content of the Zn-containing film has a great influence on the effect of suppressing the Zn concentration in the fillet. Then, in the present invention, the influence on the effect of suppressing the concentration of Zn in the fillet due to the origin of the Zn element, that is, whether the Zn element is attached to the outer surface of the tube body in the state of a Zn atom or zinc ion.
  • the effect on the effect of suppressing Zn concentration on the fillet depending on whether it is attached in a state, or the Zn source is a flux powder composed of a Zn-containing compound, a pure Zn powder, or a zinc spray film.
  • the effect of the presence on the effect of suppressing Zn concentration in the fillet is small.
  • only the atomic equivalent Zn amount on the surface of the tube body is limited, and the total mass of the Zn-containing film is not limited.
  • the tube material for a heat exchanger according to the present invention may be manufactured by any method, and is manufactured by, for example, the method shown below.
  • the tube body is manufactured by extrusion processing or rolling processing.
  • an aluminum alloy that has been homogenized under the following conditions.
  • the ingot of an aluminum alloy having a predetermined chemical composition is held at a temperature of 400 to 650 ° C. for 2 hours or more to perform the homogenization treatment.
  • the coarse crystallized material formed during casting can be decomposed or granulated, and the non-uniform structure such as the segregated layer generated during casting can be homogenized.
  • the holding temperature in the homogenization treatment is less than 400 ° C., coarse crystallization and the above-mentioned non-uniform structure may remain, which may lead to a decrease in extrudability and an increase in surface roughness.
  • the higher the holding temperature in the homogenization treatment the shorter the holding time and the higher the productivity.
  • the holding temperature in the homogenization treatment is preferably 400 to 650 ° C, more preferably 430 to 620 ° C.
  • the holding time in the homogenization treatment is preferably 5 hours or more from the viewpoint of sufficient homogenization.
  • the retention time in the homogenization treatment is preferably 5 to 24 hours.
  • the above-mentioned (1) flux powder composed of a Zn-containing compound, a binder, and, if necessary, a flux powder composed of a Zn-free compound, etc. are contained. A method of applying a paste-like paint to the outer surface of the tube body and drying it. (2) A flux powder consisting of a pure Zn powder, a binder, and, if necessary, a Zn-containing compound or Zn-free. A method of applying a paste-like paint containing a flux powder composed of a compound to the outer surface of the tube body and drying it, and (3) a method of performing zinc spraying on the outer surface of the tube body to form a zinc spray film. And so on.
  • the fin material for the heat exchanger according to the present invention is made of an aluminum alloy.
  • the fin material for a heat exchanger according to the present invention refers to a fin material before being joined to a tube material, that is, before joining and heating.
  • the fin material for a heat exchanger according to the present invention has a single layer heat bonding function at a temperature at which the liquid phase ratio is 5.0% or more and 35.0% or less. That is, the fin material for a heat exchanger according to the present invention is a fin material made of a single-layer brazing sheet.
  • the single-layer brazing sheet has a temperature at which the ratio of the mass of the liquid phase generated in the aluminum alloy material to the total mass of the aluminum alloy material (hereinafter referred to as "liquid phase ratio") is 5% or more and 35% or less. It is necessary to join with. If the liquid phase ratio exceeds 35%, the amount of the liquid phase generated is too large, and the aluminum alloy material cannot maintain its shape and undergoes large deformation. On the other hand, if the liquid phase ratio is less than 5%, joining becomes difficult.
  • the preferred liquid phase ratio is 5 to 30%, and the more preferable liquid phase ratio is 10 to 20%.
  • FIG. 1 schematically shows a phase diagram of an Al—Si alloy, which is a typical binary eutectic alloy.
  • the aluminum alloy material having a Si concentration of c1 is heated, the formation of a liquid phase starts at a temperature T1 near the eutectic temperature (solid phase temperature) Te.
  • T1 near the eutectic temperature (solid phase temperature) Te.
  • Te eutectic temperature
  • FIG. 2A crystal precipitates are distributed in the matrix divided by the grain boundaries.
  • FIG. 2B shows the crystal grain boundaries having a large segregation of the crystal precipitate distribution are melted to form a liquid phase.
  • the periphery of the crystal precipitate particles of Si which is the main additive element component dispersed in the matrix of the aluminum alloy, and the intermetallic compound are spherically melted to form a liquid phase.
  • this spherical liquid phase generated in the matrix is re-solidified in the matrix with the passage of time and temperature rise due to the interfacial energy, and the grain boundaries and the surface are diffused in the solid phase. Move to. Then, as shown in FIG. 1, when the temperature rises to T2, the liquid phase amount increases from the state diagram. As shown in FIG.
  • the spherical liquid phase generated in the matrix is re-solidified into the matrix with the passage of time and the temperature rise due to the interfacial energy, and diffuses in the solid phase, as in the case of c1. Moves to grain boundaries and surfaces.
  • the temperature rises to T3 the amount of liquid phase increases from the state diagram.
  • the bonding in the present invention utilizes the liquid phase generated by the partial melting inside the single-layer brazing sheet (fin material for heat exchanger according to the present invention), and both the bonding and the shape maintenance are compatible. Can be realized.
  • a single-layer brazing sheet that produces a liquid phase and an aluminum alloy mating material to be bonded to the single-layer brazing sheet are combined, and these are heated at a temperature at which the liquid phase ratio is 5.0% or more and 35.0% or less. Then, when the joint is observed with a microscope, as described above, the very small amount of the liquid phase generated on the surface of the single-layer brazing sheet in the joint is with the aluminum alloy mating material whose oxide film is destroyed by the action of flux or the like. Fill the gap.
  • the liquid phase near the joint interface between the two alloys moves into the aluminum alloy mating material, and along with this, the crystal grains of the solid phase ⁇ phase of the single-layer brazing sheet in contact with the joint interface are the aluminum alloy. It grows toward the inside of the mating material. On the other hand, the crystal grains of the aluminum alloy mating material also grow toward the single-layer brazing sheet side. Then, the structure is formed as if the structure of the single-layer brazing sheet has entered the aluminum alloy mating material near the bonding interface. Therefore, no metal structure other than the single-layer brazing sheet and the aluminum alloy mating material is formed at the bonding interface.
  • the metal structure of the joint is composed of only those of both jointed members, or both jointed members are formed.
  • the joint structure is different from the case of using a brazing sheet clad with a brazing material or the case of welding in that it is composed of an integrated material.
  • the liquid phase ratio specified in the present invention shall be obtained by equilibrium calculation. Specifically, it is calculated from the alloy composition and the maximum temperature reached during heating by thermodynamic equilibrium calculation software such as Thermo-Calc (registered trademark) manufactured by Thermo-Calc Software AB.
  • FIG. 4 is a modification of FIG.
  • a line extending parallel to the horizontal axis through the temperature Te (hereinafter referred to as “solid phase line 1”) and a boundary with the ⁇ phase are defined from the left end of the solid phase line 1.
  • the line extending to the upper left up to 660 ° C. on the vertical axis (hereinafter referred to as "solid phase line 2”) both represent a solid phase line. Further, while defining the boundary between the line extending downward to the right from 660 ° C.
  • liquid phase line 1 on the vertical axis and tangent to the solid phase line 1 (hereinafter referred to as "liquid phase line 1") and (Si + liquid phase).
  • the lines extending to the upper right from the tangent position both represent liquid phase lines.
  • the point of the temperature T2 is P0
  • a line parallel to the horizontal axis in the figure is drawn through P0
  • the intersection with the liquid phase line 1 is P1
  • the intersection with the solid phase line 2 is P2.
  • the Al—Si alloy having a Si concentration of C1 is in a state where a liquid phase and a solid phase coexist under the temperature T2, and the Si concentration in the liquid phase is the concentration CP1 at the point P1 and is in the solid phase.
  • the Si concentration is the concentration CP2 at the point P2 .
  • the ratio of the mass of the liquid phase to the total mass at the temperature T2, that is, the liquid phase ratio is the ratio of the lengths of the line segments P0 to P2 to the lengths of the line
  • the liquid phase ratio can be obtained by drawing from the alloy components and temperature based on the state diagrams of the binary alloy as shown in FIGS. 1 and 4. Further, also in the multi-component system of the ternary system or more, the liquid phase ratio can be obtained even in the multi-component system of the ternary system or more by plotting from the alloy component and the temperature based on the state diagram. Although it is difficult to represent the state diagram of a multi-component system of ternary system or more as a simple XY plan view as shown in FIG. 4, by using the thermodynamic equilibrium calculation software of Thermo-Calc, it is possible to use the thermodynamic equilibrium calculation software.
  • the liquid phase ratio can be obtained by computer calculation.
  • the chemical composition of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is such that the single layer has a heat bonding function at a temperature where the liquid phase ratio is 5.0% or more and 35.0% or less.
  • an aluminum alloy containing 1.00 to 5.00% by mass of Si and 0.05 to 2.00% by mass of Mn, and the balance Al and unavoidable impurities is preferable.
  • the aluminum alloy forming the fin material for the heat exchanger according to the present invention contains Si.
  • the Si content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 1.00 to 5.00% by mass.
  • Si is an element that forms an Al—Si-based liquid phase and contributes to bonding.
  • Si forms an Al—Si-based liquid phase, and bonding becomes possible.
  • the Si content of the aluminum alloy forming the fin material for the heat exchanger is less than the above range, a sufficient amount of liquid phase cannot be generated, the liquid phase exudes less, and bonding is not possible.
  • the Si content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is preferably 1.50 to 3.50% by mass, more preferably 2.00 to 3.00% by mass. ..
  • the amount of liquid phase that exudes increases as the plate thickness increases and the heating temperature increases. Therefore, the amount of liquid phase required for heating contains Si, which is required depending on the structure of the heat exchanger to be manufactured. It is preferable to adjust the amount and the bonding heating temperature.
  • the aluminum alloy forming the fin material for the heat exchanger according to the present invention contains Mn.
  • the Mn content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 0.05 to 2.00% by mass, preferably 0.10 to 2.00% by mass, and more preferably 0.30 to 1%. .50% by mass.
  • Mn is an important additive element that forms an Al—Mn—Si-based intermetallic compound together with Si and acts as a dispersion strengthening, or dissolves in an aluminum matrix and improves the strength by solid solution strengthening. .. When the Mn content of the aluminum alloy forming the fin material for the heat exchanger is within the above range, the strength of the fin material is increased.
  • the Mn content of the aluminum alloy forming the fin material for the heat exchanger is less than the above range, the above effect is insufficient, and if it exceeds the above range, coarse intermetallic compounds are likely to be formed and the corrosion resistance is improved. It gets lower.
  • the aluminum alloy forming the fin material for the heat exchanger according to the present invention can contain Fe.
  • the Fe content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 2.00% by mass or less, preferably 0.10 to 2.00% by mass, and more preferably 0.20 to 1.00% by mass. %.
  • it also has the effect of dispersing as crystallization to prevent a decrease in strength particularly at high temperatures. If the Fe content of the aluminum alloy forming the fin material for the heat exchanger exceeds the above range, coarse metal-to-metal compounds are generated during casting, which causes a problem in manufacturability, and the heat exchanger is in a corrosive environment (particularly liquid).
  • the Fe content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is preferably 0.50% by mass or less, preferably 0.30. It is more preferably mass% or less.
  • the aluminum alloy forming the fin material for the heat exchanger according to the present invention may contain Mg.
  • the Mg content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 2.00% by mass or less, preferably 0.05 to 2.00% by mass, and more preferably 0.10 to 1.50% by mass. %.
  • Mg is an additive element that causes age hardening with Mg 2 Si after bonding and heating, and exerts the effect of improving strength by this age hardening. When the Mg content of the aluminum alloy forming the fin material for the heat exchanger is within the above range, the strength of the fin material is increased.
  • the aluminum alloy forming the fin material for the heat exchanger according to the present invention can contain Cu.
  • the Cu content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 1.50% by mass or less, preferably 0.05 to 1.50% by mass.
  • Cu is an additive element that dissolves in the matrix to improve its strength.
  • the strength of the fin material is increased.
  • the corrosion resistance becomes low.
  • the aluminum alloy forming the fin material for the heat exchanger according to the present invention can contain Zn.
  • the Zn content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 6.00% by mass or less, preferably 0.05 to 6.00% by mass.
  • the addition of Zn is effective in improving the corrosion resistance due to the sacrificial anticorrosion action.
  • Zn is almost uniformly solid-solved in the matrix, but when a liquid phase is formed, it dissolves in the liquid phase and the Zn of the liquid phase is concentrated. When the liquid phase exudes to the surface, the Zn concentration in that portion increases, so that the corrosion resistance is improved by the sacrificial anode action.
  • the fin material for heat exchanger according to the present invention as the fin material used for the heat exchanger, the sacrificial anticorrosion action for anticorrosion of the tube or the like can be exerted.
  • the fin material has an appropriate sacrificial anticorrosion action.
  • the corrosion rate becomes high and the self-corrosion resistance becomes low.
  • the aluminum alloy forming the fin material for the heat exchanger according to the present invention can contain Ti and / or V.
  • the Ti content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 0.30% by mass or less, preferably 0.05 to 0.30% by mass.
  • the V content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 0.30% by mass or less, preferably 0.05 to 0.30% by mass.
  • they are distributed in layers and have the effect of preventing the progress of corrosion in the plate thickness direction.
  • the strength can be increased and the progress of corrosion in the plate thickness direction can be delayed.
  • the Ti or V content of the aluminum alloy forming the fin material for the heat exchanger exceeds the above range, coarse crystallization is generated, which impairs moldability and corrosion resistance.
  • the aluminum alloy forming the fin material for the heat exchanger according to the present invention can contain Zr.
  • the Zr content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 0.30% by mass or less, preferably 0.05 to 0.30% by mass.
  • Zr is precipitated as an Al—Zr-based intermetallic compound and exerts an effect of improving the strength after bonding by strengthening the dispersion, and the Al—Zr-based intermetallic compound acts on the coarsening of crystal grains during heating. ..
  • the strength is increased.
  • the Zr content of the aluminum alloy forming the fin material for the heat exchanger exceeds the above range, it becomes easy to form a coarse intermetallic compound, and the plastic workability becomes low.
  • the aluminum alloy forming the fin material for the heat exchanger according to the present invention can contain Cr.
  • the Cr content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 0.30% by mass or less, preferably 0.05 to 0.30% by mass. Cr improves the strength by strengthening the solid solution, and acts on the coarsening of crystal grains after heating by precipitating an Al—Cr-based intermetallic compound.
  • the Cr content of the aluminum alloy forming the fin material for the heat exchanger is within the above range, the strength is increased.
  • the Cr content of the aluminum alloy forming the fin material for the heat exchanger exceeds the above range, it becomes easy to form a coarse intermetallic compound, and the plastic workability becomes low.
  • the aluminum alloy forming the fin material for the heat exchanger according to the present invention can contain Ni.
  • the Ni content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 2.00% by mass or less, preferably 0.05 to 2.00% by mass.
  • Ni crystallizes or precipitates as an intermetallic compound, and exerts the effect of improving the strength after bonding by strengthening the dispersion.
  • the strength is increased.
  • the Ni content of the aluminum alloy forming the fin material for the heat exchanger exceeds the above range, it becomes easy to form a coarse intermetallic compound, the processability becomes low, and the self-corrosion resistance becomes low.
  • the aluminum alloy forming the fin material for the heat exchanger according to the present invention can contain Sn and / or In.
  • the Sn content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 0.30% by mass or less, preferably 0.05 to 0.30% by mass.
  • the In content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 0.30% by mass or less, preferably 0.05 to 0.30% by mass.
  • Sn and In have the effect of exerting a sacrificial anode action.
  • the corrosion resistance of the heat exchanger is improved.
  • the Sn or In content of the aluminum alloy forming the fin material for the heat exchanger exceeds the above range, the corrosion rate becomes high and the self-corrosion resistance becomes low.
  • the aluminum alloy forming the fin material for the heat exchanger according to the present invention may contain one or more selected from Be, Sr, Bi, Na and Ca.
  • the Be content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 0.10% by mass or less, preferably 0.001 to 0.10% by mass.
  • the Sr content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 0.10% by mass or less, preferably 0.001 to 0.10% by mass.
  • the Na content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 0.10% by mass or less, preferably 0.001 to 0.10% by mass.
  • the Ca content of the aluminum alloy forming the fin material for the heat exchanger according to the present invention is 0.05% by mass or less, preferably 0.001 to 0.05% by mass. These trace elements can improve the bondability by finely dispersing Si particles, improving the fluidity of the liquid phase, and the like.
  • the bondability is improved.
  • the Be, Sr, Bi, Na or Ca content of the aluminum alloy forming the fin material for the heat exchanger exceeds the above range, adverse effects such as low corrosion resistance may occur.
  • one kind selected from Be, Sr, Bi, Na and Ca is added, and when two or more kinds are added, any element is added within the above component range.
  • the fin material for a heat exchanger according to the present invention may be manufactured by any method, and is manufactured by, for example, the method shown below.
  • the casting speed of the slab at the time of casting is controlled as follows. Since the casting speed affects the cooling speed, it is set to 20 to 100 mm / min. If the casting speed is less than 20 mm / min, a sufficient cooling rate cannot be obtained, and crystallized intermetallic compounds such as Si-based intermetallic compounds and Al—Fe—Mn—Si-based intermetallic compounds become coarse. On the other hand, if it exceeds 100 mm / min, the aluminum material does not sufficiently solidify during casting, and a normal ingot cannot be obtained. It is preferably 30 to 80 mm / min.
  • the ingot (slab) thickness at the time of continuous DC casting is preferably 600 mm or less.
  • the slab thickness exceeds 600 mm, a sufficient cooling rate cannot be obtained and the intermetallic compound becomes coarse.
  • a more preferable slab thickness is 500 mm or less.
  • homogenization treatment, hot rolling, cold rolling, and annealing are performed as necessary, and the usual steps are performed to obtain a fin material for a heat exchanger according to the present invention.
  • tempering is performed according to the application. This tempering is usually set to H1n or H2n to prevent erosion, but a soft material (O material) may be used depending on the shape and usage.
  • the fin material for a heat exchanger according to the present invention can also be manufactured by using a continuous casting method.
  • the manufacturing method is not particularly limited as long as it is a method of continuously casting a plate material such as a double roll type continuous casting and rolling method and a double belt type continuous casting method.
  • the double-roll continuous casting and rolling method is a method in which molten aluminum is continuously cast and rolled by supplying molten aluminum between a pair of water-cooled rolls from a refractory hot water supply nozzle, and the Hunter method, 3C method, etc. are known. ing.
  • the twin-belt type continuous casting method molten metal is poured between rotating belts that face each other up and down and are water-cooled, and the molten metal is solidified by cooling from the belt surface to form a slab.
  • This is a continuous casting method in which the slab is continuously pulled out and wound into a coil.
  • the cooling rate at the time of casting is several to several hundred times faster than that of the DC casting method.
  • the cooling rate in the case of the DC casting method is 0.5 to 20 ° C./sec
  • the cooling rate in the case of the double-roll type continuous casting and rolling method is 100 to 1000 ° C./sec.
  • the dispersed particles generated during casting have a feature of being finely and densely distributed as compared with the DC casting method.
  • the densely distributed dispersed particles can react with the matrix around these dispersed particles at the time of bonding to facilitate the formation of a large amount of liquid phase, whereby good bonding properties can be obtained.
  • the speed of the rolled plate when casting by the double-roll type continuous casting rolling method is preferably 0.5 m / min or more and 3 m / min or less.
  • the casting rate affects the cooling rate. If the casting speed is less than 0.5 m / min, a sufficient cooling rate cannot be obtained and the compound becomes coarse.
  • the molten metal temperature when casting by the double-roll type continuous casting rolling method is preferably in the range of 650 to 800 ° C.
  • the molten metal temperature is the temperature of the head box immediately before the hot water supply nozzle.
  • the molten metal temperature is less than 650 ° C., huge dispersed particles of intermetallic compounds are generated in the hot water supply nozzle, and they are mixed in the ingot, which causes plate breakage during cold rolling.
  • the molten metal temperature exceeds 800 ° C.
  • the aluminum material does not sufficiently solidify between the rolls during casting, and a normal plate-shaped ingot cannot be obtained.
  • a more preferable molten metal temperature is 680 to 750 ° C.
  • the plate thickness to be cast is preferably 2 mm to 10 mm. In this thickness range, the solidification rate at the center of the plate thickness is high, and a uniform structure can be easily obtained. If the thickness of the cast plate is less than 2 mm, the amount of aluminum passing through the casting machine per unit time is small, and it becomes difficult to stably supply the molten metal in the plate width direction. On the other hand, if the cast plate thickness exceeds 10 mm, winding by a roll becomes difficult.
  • a more preferable cast plate thickness is 4 mm to 8 mm.
  • the obtained cast plate material is rolled to the final plate thickness to obtain a fin material for a heat exchanger according to the present invention.
  • Annealing may be performed once or more in the process of rolling to the final plate thickness.
  • the heat exchanger of the present invention is a combination of a heat exchanger tube material according to the present invention, a heat exchanger fin material according to the present invention, and a member to be combined as needed, such as a header, and then a combination obtained.
  • a heat exchanger tube material according to the present invention By heating the body at a temperature at which the liquid phase ratio of the fin material is 5.0% or more and 35.0% or less, the heat exchanger tube material according to the present invention and the heat exchanger fin material according to the present invention are joined. It is obtained by doing.
  • the heat bonding condition for heating a combination of the heat exchanger tube material according to the present invention, the heat exchanger fin material according to the present invention, and a member to be combined as needed, such as a header is 400 ° C. or higher.
  • the region is heated at an average heating rate of 10 ° C./min, held at 590 to 610 ° C., preferably 600 ° C. for 3 minutes, and cooled to 100 ° C. or lower.
  • the heating atmosphere at the time of heat bonding is not particularly limited. Since Si affects the solidus temperature, the tube material for heat exchanger according to the present invention, the fin material for heat exchanger according to the present invention, and a member to be combined as needed, such as a header, are combined.
  • the heating temperature at which the combination is heat-bonded is appropriately selected depending on the Si content. In addition to Si, Zn and Cu also affect the solidus temperature.
  • the fin material for a heat exchanger according to the present invention contains Zn and / or Cu in addition to Si
  • the present invention is used.
  • the heating temperatures for heat-bonding a combination of the heat exchanger tube material, the heat exchanger fin material according to the present invention, and a member to be combined as needed, such as a header, are Si and Zn. And / or appropriately selected depending on the content of Cu.
  • the fillet cross-sectional area formed between the fin and the tube is a brazing sheet clad with a brazing material. Smaller than the one used.
  • the Zn content of the Zn-containing film formed on the surface of the tube material is set to 1.0 to 4.5 g / m 2 , which is within an appropriate range.
  • Zn concentration to zinc is suppressed, and the fillet potential is not the lowest, or even if it is the lowest, the potential difference with other parts is within 40 mV, so preferential corrosion of the fillet is prevented and the fillet is prevented from being preferentially corroded for a long period of time. Corrosion resistance and heat exchange performance as a core are guaranteed.
  • the heat exchanger of the present invention combines the heat exchanger tube material according to the present invention, the heat exchanger fin material according to the present invention, and a member to be combined as needed, such as a header, and then obtains.
  • a member to be combined as needed such as a header
  • the tube material for the heat exchanger according to the present invention and the fin material for the heat exchanger according to the present invention are heated. It was obtained by joining.
  • the heat exchanger tube material according to the present invention and the heat exchanger fin material according to the present invention are the same as those described above.
  • the heat exchanger of the present invention is a heat exchanger having an aluminum alloy tube through which a working fluid flows and an aluminum alloy fin metal-bonded to the tube.
  • a tube material main body made of an aluminum alloy a Zn-containing film formed on the outer surface of the tube material main body and containing Zn of 1.0 to 4.5 g / m 2 in terms of atoms, and a Zn-containing film.
  • the obtained combination is heated at a temperature at which the liquid phase ratio of the heat exchanger fin material is 5.0% or more and 35.0% or less, and the heat exchanger tube material and the heat exchanger fin are heated. It must be obtained by joining materials, It is a heat exchanger characterized by.
  • the heating temperature at the time of heat-bonding a combination of a heat exchanger tube material according to the present invention, a heat exchanger fin material according to the present invention, and a member to be combined as needed, such as a header, is a fin.
  • the temperature is such that the liquid phase ratio of the material is 5.0% or more and 35.0% or less.
  • the condition that the temperature is maintained at 610 ° C., preferably 600 ° C. for 3 minutes and cooled to 100 ° C. or lower is preferable. Since Si affects the solidus temperature, the tube material for heat exchanger according to the present invention, the fin material for heat exchanger according to the present invention, and a member to be combined as needed, such as a header, are combined.
  • the heating temperature at which the combination is heat-bonded is appropriately selected depending on the Si content.
  • Zn and Cu also affect the solidus temperature. Therefore, when the fin material for a heat exchanger according to the present invention contains Zn and / or Cu in addition to Si, the present invention is used.
  • the heating temperatures for heat-bonding a combination of the heat exchanger tube material, the heat exchanger fin material according to the present invention, and a member to be combined as needed, such as a header, are Si and Zn. And / or appropriately selected depending on the content of Cu.
  • a tube material for a heat exchanger according to the present invention, a fin material for a heat exchanger according to the present invention, and a member to be combined as needed, such as a header are combined.
  • a temperature at which the liquid phase ratio of the fin material is 5.0% or more and 35.0% or less heat exchange between the tube material for heat exchanger according to the present invention and the heat exchange according to the present invention is performed.
  • the heat exchanger tube material according to the present invention and the heat exchanger fin material according to the present invention are the same as those described above.
  • An extruded tube material was prepared using an alloy having the chemical components shown in Table 1. Further, a fin material was produced using an alloy having the chemical components shown in Table 2. Then, using the obtained tube material and fin material, a mini core simulating a heat exchanger as shown in FIG. 5 was assembled and heat-bonded, and the corrosion resistance of the obtained mini core was evaluated.
  • a paint containing a flux powder made of a K—Zn—F compound was applied to a flat surface of the tube body using a roll coater, and dried. Further, in the tube materials of Comparative Examples 1 and 2, Zn spraying was performed immediately after extrusion, and Zn was sprayed on the surface of the tube body.
  • the Zn content of the Zn-containing film is the content before heat bonding.
  • ⁇ Making fins> After casting the alloy components shown in Table 2 to a plate thickness of 6 mm by continuous casting, intermediate annealing was performed to soften the material, and the plate thickness was reduced to 0.20 mm by cold rolling, and final annealing was performed. Was carried out and used as a test material.
  • the obtained plate material was corrugated to produce a fin material having a corrugated shape.
  • the fin pitch was 3 mm and the fin height was 10 mm.
  • Examples 4 to 6, Comparative Examples 3 to 4 ⁇ Assembly of mini core>
  • the upper and lower parts of the fin material were laminated so as to be sandwiched between the tube materials, and assembled into a predetermined shape shown in FIG.
  • a mini core simulating a heat exchanger was obtained.
  • the heating is performed in a nitrogen gas atmosphere, the temperature of the tube material and the fin material is raised to 600 ° C. in the region of 400 ° C. or higher at an average heating rate of 10 ° C. per minute, and the temperature of 600 ⁇ 3 ° C. is raised for 3 minutes. After holding, the temperature was lowered to room temperature.
  • Corrosion resistance was evaluated using the five types of mini cores (test bodies 1 to 5) obtained as described above. The results are shown in Table 4. Based on the composition of the fin material B, the liquid phase ratio of the fin material B at 600 ° C. was determined by the method described in the present specification and was calculated to be 16.6%.
  • Examples 4 to 6 did not cause preferential corrosion of fillets and premature shedding of fins, and showed excellent corrosion resistance even in a harsh corrosive environment.
  • Comparative Examples 3 and 4 preferential corrosion of the fillet occurred and the fins fell off at an early stage, resulting in inferior corrosion resistance.

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Abstract

Cet échangeur de chaleur présente des tubes en alliage d'aluminium à travers lesquels un fluide de travail est mis en circulation et des ailettes en alliage d'aluminium qui sont reliées de manière métallique aux tubes, l'échangeur de chaleur étant caractérisé en ce que : les tubes sont chacun formés à partir d'un matériau de tube d'échangeur de chaleur qui comporte un corps en matériau de tube en alliage d'aluminium et un film contenant du Zn, qui est formé sur la surface externe du corps de matériau de tube et contient 1,0-4,5 g/m2 de Zn en termes de teneur en atomes ; les ailettes sont chacune réalisées à partir d'un alliage d'aluminium et sont formées à une température où leur liquidité est de 5,0-35,0 % au moyen d'un matériau d'ailette d'échangeur de chaleur qui exerce, dans une seule couche, une fonction de liaison thermique. Selon la présente invention, il est possible de fournir un échangeur de chaleur qui peut être obtenu au moyen d'un matériau d'ailette en feuille de brasage monocouche, et qui permet la retenue d'ailettes sur des tubes pendant une longue période et présente une excellente performance d'échange de chaleur et une excellente protection contre la corrosion par la suppression d'une concentration excessive de Zn sur des filets et la prévention d'une baisse excessive de potentiel de filet.
PCT/JP2021/045164 2020-12-23 2021-12-08 Échangeur de chaleur, matériau de tube d'échangeur de chaleur et matériau d'ailette d'échangeur de chaleur WO2022138171A1 (fr)

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Publication number Priority date Publication date Assignee Title
WO2013080650A1 (fr) * 2011-12-02 2013-06-06 古河スカイ株式会社 Matériau en alliage d'aluminium et structure en alliage d'aluminium et leur procédé de production
WO2014020722A1 (fr) * 2012-08-01 2014-02-06 古河スカイ株式会社 Procédé permettant de produire un tube en alliage d'aluminium ayant une couche anticorrosive sacrificielle et une couche d'assemblage
JP2019168145A (ja) * 2018-03-22 2019-10-03 株式会社Uacj 熱交換器用チューブ及び熱交換器の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013080650A1 (fr) * 2011-12-02 2013-06-06 古河スカイ株式会社 Matériau en alliage d'aluminium et structure en alliage d'aluminium et leur procédé de production
WO2014020722A1 (fr) * 2012-08-01 2014-02-06 古河スカイ株式会社 Procédé permettant de produire un tube en alliage d'aluminium ayant une couche anticorrosive sacrificielle et une couche d'assemblage
JP2019168145A (ja) * 2018-03-22 2019-10-03 株式会社Uacj 熱交換器用チューブ及び熱交換器の製造方法

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