Denso Corporation

Uacj Corporation

Mitsubishi Aluminum Company, Ltd.

Nobuhiro Honma

Naoki Sugimoto

Taketoshi Toyama

Shogo Yamada

Tomoki Yamayoshi

Michihide Yoshino

Hayaki Teramoto

Hideyuki Miyake

Masakazu Edo

Hidetoshi Kumagai

Shohei Iwao

Takahiro Shinoda

Yoshiki Mori

Hirokazu Tanaka

Shinichi Nakamura

Toshihide Ninagawa

Yoshihiko Sonoda

Manabu Hasegawa

Takeyoshi Dokou

An aluminum alloy brazing sheet used for brazing of an aluminum material in an inert gas atmosphere or in vacuum is formed of a two-layer material in which a brazing material and a core material are stacked in this order. The core material is formed of an aluminum alloy and has a grain size of 20 to 300 μm, and the aluminum alloy includes Mn of 0.50 to 2.00 mass %, Mg of 0.40 to 2.00 mass %, Si of 1.50 mass % or less, and Fe of 1.00 mass % or less. The brazing material is formed of an aluminum alloy including Si of 4.00 to 13.00 mass % and one or two or more of Mn of 2.00 mass or less, Ti of 0.30 mass % or less, Zr of 0.30 mass % or less, and Cr of 0.30 mass % or less.

Aluminum alloy brazing sheet and manufacturing method thereof

An aluminum alloy brazing sheet is formed of a four-layer material formed of a brazing material, an intermediate material, a core material, and a brazing material. The intermediate material comprises Mg of 0.40 to 6.00 mass %, and has a total of contents of Mn, Cr, and Zr being 0.10 mass % or more. The core material comprises Mg of 0.20 to 2.00 mass % and comprises one or two or more of Mn of 1.80 mass % or less, Si of 1.05 mass % or less, Fe of 1.00 mass % or less, Cu of 1.20 mass % or less, Ti of 0.30 mass % or less, Zr of 0.30 mass % or less, and Cr of 0.30 mass % or less. Each of the core material and the intermediate material has a grain size of 20 to 300 &#x3bc;m.

A brazing sheet () includes a core material () composed of an Al alloy that contains 0.20-3.0 mass % of Mg; and a filler material () layered on the core material and composed of an Al alloy that contains Mg, 6.0-13.0 mass % of Si, and more than 0.050 mass % and 1.0 mass % or less of Bi. The Mg concentration of the filler material becomes continuously lower in a direction from a boundary () with the core material to an outermost surface (). The Mg concentration of the filler material is 0.150 mass % or less at a first depth from the outermost surface that is &#x215b; of a thickness (t) of the filler material and is 5-90% of the amount of Mg in the core material at a second depth from the outermost surface that is &#x215e; of the thickness of the filler material.

Brazing sheet and manufacturing method thereof

An aluminum alloy brazing sheet used for brazing of an aluminum material in an inert gas atmosphere or in vacuum is formed of a two-layer material in which a brazing material and a core material are stacked. The core material is formed of an aluminum alloy and has a grain size of 20 to 300 &#x3bc;m, and the aluminum alloy contains Mn of 0.50 to 2.00 mass %, Mg of 0.40 to 2.00 mass %. Si of 1.50 mass % or less, Fe of 1.00 mass % or less, and Ti of 0.10 to 0.30 mass %, with the balance being aluminum and inevitable impurities. The brazing material is formed of an aluminum alloy containing Si of 4.00 to 13.00 mass % with the balance being aluminum and inevitable impurities. In a drop-type fluidity test, a ratio &#x3b1; (&#x3b1;=K/K) of a fluid coefficient Kis 0.50 or more.

A sacrificial material on one surface of a core material, a Al brazing material containing Si: 6.0% to 14.0%, Mg: 0.05% to 1.5%, Bi: 0.05% to 0.25%, Sr: 0.0001% to 0.1%, and Al balance and satisfying (Bi+Mg)&#xd7;Sr&#x2264;0.1 is disposed on the other surface, Mg&#x2014;Bi-based compounds of the brazing material with a diameter of 0.1-5.0 &#x3bc;m are more than 20 per 10,000-&#x3bc;mand the Mg&#x2014;Bi-based compounds with a diameter of 5.0 &#x3bc;m or more are less than 2 before brazing, the core material contains Mn: 1.0% to 1.7%, Si: 0.2% to 1.0%, Fe: 0.1% to 0.5%, Cu: 0.08% to 1.0%, Mg: 0.1% to 0.7%, and Al balance, the sacrificial material contains Zn: 0.5% to 6.0% and Mg of which a content is limited to 0.1% or less, and a Mg concentration on a surface of the sacrificial material after brazing is 0.15% or less.

Aluminum alloy clad material

An aluminum alloy clad material includes: a sacrificial material on one surface of a core material; and an Al&#x2014;Si&#x2014;Mg&#x2014;Bi-based brazing material disposed on other surface of the core material, contains, by mass %, Si: 6.0% to 14.0%, Mg: 0.05% to 1.5%, Bi: 0.05% to 0.25%, Sr: 0.0001% to 0.1%, and a balance consisting of Al and inevitable impurities, and satisfies a relationship of (Bi+Mg)&#xd7;Sr&#x2264;0.1 by mass %, in which Mg&#x2014;Bi-based compounds contained in the Al&#x2014;Si&#x2014;Mg&#x2014;Bi-based brazing material with a diameter of 0.1 &#x3bc;m or more and less than 5.0 &#x3bc;m are more than 20 in number per 10,000-&#x3bc;mand the Mg&#x2014;Bi-based compounds with a diameter of 5.0 &#x3bc;m or more are less than 2 in number, and the core material contains Mn: 0.9% to 1.7%, Si: 0.2% to 1.0%, Fe: 0.1% to 0.5%, Cu: 0.08% to 1.0%, and a balance consisting of Al and inevitable impurities.

An Al&#x2014;Si&#x2014;Mg&#x2014;Bi-based brazing material containing Si: 6.0% to 14.0%, Fe: 0.05% to 0.3%, Mg: 0.02% to 1.5%, Bi: 0.05% to 0.25%, Sr: 0.0001% to 0.1%, and a balance of Al and inevitable impurities, and satisfies (Bi+Mg)&#xd7;Sr&#x2264;0.1, is disposed on both surfaces of a core material, Mg&#x2014;Bi-based compounds of the brazing material with a diameter of 0.1 &#x3bc;m or more and less than 5.0 &#x3bc;m in terms of equivalent circle diameter are more than 20 in number in 10,000 &#x3bc;mand the Mg&#x2014;Bi-based compounds with diameter of 5.0 &#x3bc;m or more are less than 2 in number in 10,000 &#x3bc;m, the core material contains Mn: 0.8% to 1.8%, Si: 0.01% to 1.0%, Fe: 0.1% to 0.5%, and a balance of Al and inevitable impurities, and a cathode current density of a brazing material layer after a brazing heat treatment is 0.1 mA/cmor less.

Provided is heat exchanger in which a rib of a core plate has a shape that is recessed from a flat surface of a flat body portion, and the rib is provided with: a rib bottom part including a bottom line that is recessed from and parallel to the flat surface of the flat body portion; and a rib inclination part that is positioned between the rib bottom part and a flat part. The rib is positioned so that the rib inclination part overlaps, in the tube stacking direction, the edge of the tube in the tube width direction.

Heat exchanger

A fin for a heat exchanger includes a flat portion having an upstream flat part and a downstream flat part parallel to a flow direction of a fluid. Multiple louvers are arranged in the flow direction. A fluid-turning part including a surface approximately parallel to the flow direction is arranged between two of the multiple louvers. A first portion of the louvers located upstream of the fluid-turning part are inclined in a direction opposite from a second portion of the louvers located downstream of the fluid-turning part. The first and second portion of the louvers include first louvers and second louvers. The first louvers are inclined from the flat portion at a first inclined angle larger than a second inclined angle at which the second louvers are inclined from the flat portion. The second louvers are arranged adjacent to the fluid-turning part.

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Chita-gun, Japan

Nobuhiro Honma