Mitsubishi Aluminum Company, Ltd.

Denso Corporation

Ma Aluminum Corporation

Mitsubishi Materials Corporation

Masakazu Edo

Michihide Yoshino

Hideyuki Miyake

Shohei Iwao

Yoshiki Mori

Hayaki Teramoto

Naoki Sugimoto

Taketoshi Toyama

Shogo Yamada

Nobuhiro Honma

Yoshiyuki Nagatomo

Yoshirou Kuromitsu

Michiyasu Yamamoto

Toshiyuki Nagase

Shoei Teshima

Hiroya Ishizuka

Manabu Hasegawa

Hiroki Amano

Masatoshi Akiyama

Yuji Nomura

Norihiro Nose

Shigeki Nakanishi

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.

An aluminum alloy fin material for a heat exchanger in the present invention comprises an aluminum alloy having a composition containing Mn: 1.2 to 2.0%, Cu: 0.05 to 0.20%, Si: 0.5 to 1.30%, Fe: 0.05 to 0.5%, and Zn: 1.0 to 3.0% by mass and a remainder comprising Al and an unavoidable impurity, further containing one or two or more of Ti: 0.01 to 0.20%, Cr: 0.01 to 0.20% and Mg: 0.01 to 0.20% by mass as desired, and, after heating in brazing, has a tensile strength of 140 MPa or more, a proof stress of 50 MPa or more, an electrical conductivity of 42% IACS or more, an average grain diameter of 150 &#x3bc;m or more and less than 700 &#x3bc;m, and a potential of &#x2212;800 mV or more and &#x2212;720 mV or less.

Aluminum alloy fin material for heat exchanger excellent in strength, electrical conductivity, and brazeability, method for manufacturing aluminum alloy fin material for heat exchanger, and heat exchanger comprising aluminum alloy fin material for heat exchanger

An aluminum alloy brazing sheet has high strength, corrosion resistance and elongation, and includes an aluminum alloy clad material. The material includes a core material, one surface of which is clad with a sacrificial material and an other surface of which is clad with an Al&#x2014;Si-based or Al&#x2014;Si&#x2014;Zn-based brazing filler metal. The core material has a composition containing 1.3 to 2.0% Mn, 0.6 to 1.3% Si, 0.1 to 0.5% Fe and 0.7 to 1.3% Cu, by mass, with the balance Al and impurities. The sacrificial material has a composition containing more than 4.0% to 8.0% Zn, 0.7 to 2.0% Mn, 0.3 to 1.0% Si, 0.3 to 1.0% Fe and 0.05 to 0.3% Ti, by mass, with the balance Al and impurities. At least the core material has a lamellar crystal grain structure. Elongation of material is at least 4% and a tensile strength after brazing is at least 170 MPa.

Aluminum alloy brazing sheet having high strength, high corrosion resistance and high material elongation, and method of manufacturing heat exchanger

[Problem] There is provided an aluminum alloy fin material with high strength, superior brazability and superior corrosion resistance. [Solving means] An aluminum alloy fin material has a composition, in % by mass, of the following: Zr: 0.05 to 0.25%, Mn: 1.3 to 1.8%, Si: 0.7 to 1.3%, Fe: 0.10 to 0.35%, and Zn: 1.2 to 3.0%, the remainder being Al and inevitable impurities. The aluminum alloy fin material has a solidus temperature of 615&#xb0; C. or higher, a tensile strength after brazing of 135 MPa or higher, a pitting potential after brazing in the range of &#x2212;900 to &#x2212;780 mV, and an average crystal grain diameter in a rolled surface after brazing in the range of 200 &#x3bc;m to 1,000 &#x3bc;m.

Aluminum alloy fin material and heat exchanger

This power module substrate with a heat sink includes a power module substrate having a circuit layer disposed on one surface of an insulating layer, and a heat sink bonded to the other surface of this power module substrate, wherein the bonding surface of the heat sink and the bonding surface of the power module substrate are each composed of aluminum or an aluminum alloy, a bonding layer () having a Mg-containing compound () (excluding MgO) which contains Mg dispersed in an Al&#x2014;Si eutectic composition is formed at the bonding interface between the heat sink and the power module substrate, and the thickness t of this bonding layer () is within a range from 5 &#x3bc;m to 80 &#x3bc;m.

Power module substrate with heat sink, and method for producing power module substrate with heat sink

In order to enable a satisfactory fluxless brazing without needing flux or vacuum facilities, a brazing object including an aluminum alloy material provided with an Al&#x2014;Si&#x2014;Mg brazing filler metal is joined by the Al&#x2014;Si&#x2014;Mg brazing filler metal without the use of flux by heating the aluminum alloy material, when raising the temperature in a brazing furnace, at least in a temperature range of 450&#xb0; C. to before melting of the filler metal under a first inert gas atmosphere having an oxygen concentration of preferably 50 ppm and following by heating at least at or above a temperature at which the filler metal starts to melt under a second inert gas atmosphere having an oxygen concentration of preferably 25 ppm and a nitrogen gas concentration of preferably 10% by volume or less. The oxygen concentration and nitrogen concentration in the atmosphere in the course of brazing are controlled in this way, whereby the reliability of a joint is remarkably improved, compared with conventional fluxless brazing methods, while suppressing cost increases as much as possible.

Growing community of inventors

Susono, Japan

Masakazu Edo