Denso Corporation

Mitsubishi Aluminum Company, Ltd.

Ma Aluminum Corporation

Yoshiki Mori

Michihide Yoshino

Masakazu Edo

Hideyuki Miyake

Shohei Iwao

Naoki Sugimoto

Taketoshi Toyama

Hayaki Teramoto

Shogo Yamada

Nobuhiro Honma

An aluminum brazing sheet has a multilayer structure of two or more layers of at least a core material and a brazing material, wherein an Al—Si—Mg—Bi-based brazing material containing, by mass %, 0.01% to 2.0% of Mg, 1.5% to 14.0% of Si, and 0.005% to 1.5% of Bi is clad on one surface or both surfaces of the core material to be located at an outermost surface of the aluminum brazing sheet, in the Al—Si—Mg—Bi based brazing material, there are more than 10 Mg—Bi-based compounds having a diameter of 0.01 μm or more and less than 5.0 μm when observed in a surface layer plane direction and there are less than 2 Mg—Bi-based compounds having a diameter of 5.0 μm or more, and in the brazing material, there are less than 5 Bi particles having a diameter of 5.0 μm or more when observed in the surface layer plane direction.

Aluminum brazing sheet for flux-free brazing

An aluminum alloy for flux-free brazing provided for brazing performed via an Al&#x2014;Si-based brazing material without a flux in a non-oxidizing atmosphere without depressurization, includes: by mass %, 0.01% to 2.0% of Mg; and 0.005% to 1.5% of Bi, wherein in the aluminum alloy, there are more than 10 Mg&#x2014;Bi-based compounds having a diameter of 0.01 &#x3bc;m or more and less than 5.0 &#x3bc;m in terms of equivalent circle diameter per 10,000-&#x3bc;mvisual field and there are less than 2 Mg&#x2014;Bi-based compounds having a diameter of 5.0 &#x3bc;m or more per 10,000-&#x3bc;mvisual field in a cross section parallel to a rolling direction, and in the aluminum alloy, there are less than 5 Bi particles having a diameter of 5.0 &#x3bc;m or more in terms of equivalent circle diameter per 10,000-&#x3bc;mvisual field in the cross section parallel to the rolling direction.

Aluminum alloy for brazing and aluminum brazing sheet

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.

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Kitamoto, Japan

Yoshiki Mori