Nippondenso Co., Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Sumitomo Light Metal Industries, Ltd.

Furukawa Aluminum Co., Ltd.

Kobe Alcoa Transportation Products Ltd.

Mituo Hashiura

Sunao Fukuda

Yuji Suzuki

Yasuhiro Suzuki

Shigenori Yamauchi

Hideo Fujimoto

Yoshifusa Shoji

Keizo Takeuchi

Masakazu Hirano

Jun Takigawa

Kazunori Ishikawa

Yasuaki Isobe

Tadashi Okamoto

Osamu Takezoe

Toshiaki Murao

Yoshiharu Hasegawa

Chian T Su

An aluminum alloy composite material for brazing has a core member, an Al--Si filler member clad on one surface of the core member and an aluminum alloy cladding member clad on the other side of the core member. The core member is made of an aluminum alloy containing 0.3 to 1.3 wt. % of Si, 0.3 to 1.5 wt. % of Mn, 0.02 to 0.3 wt. % of Ti, and, as required, 0.3 wt. % or less of Cr and 0.2 wt. % or less of Zr, the content of Mg being restricted to 0.2 wt. % or less and the content of the Cu being restricted to 0.2 wt. % or less as an impurity. The cladding member is made of an aluminum alloy containing 0.3 to 3 wt. % of Mg, 5 wt. % or less of Zn, 0.1 to 1.0 wt. % of Si. The thickness of the core member is preferably, 2.5 times or more greater than that of the filler member, falling within a range of 0.1 to 1 mm. With this, it is possible to obtain an aluminum alloy composite material which cannot degraded in brazability and corrosion resistance even when brazed by the brazing method with noncorrosive flux and which has enough high strength to be used for a material of a high-strength heat exchanger, highly improved corrosion resistance and excellent brazability.

Aluminum alloy composite material for brazing

A clad aluminum alloy material having high strength and high corrosion resistance for a heat exchanger, which is composed of a core material made of an aluminum alloy consisting of 0.3 to 2.0% of Mn, 0.25 to 0.8% of Cu, 0.05 to 1.0% of Si and 0.5% or less of Mg with the balance consisting of Al and unavoidable impurities; a sacrificial anode material bonded to one surface of the core material, the sacrificial anode material being made of an aluminum alloy consisting of 1.0 to 2.5% of Mg and 0.05 to less than 0.20% of Si with the balance consisting of Al and unavoidable impurities; and a cladding bonded to the other surface of the core material, the cladding being made of a brazing filler metal consisting of an Al-Si-base aluminum alloy. In the clad aluminum alloy materials, the core material may further include 0.35% or less of Ti and the sacrificial anode material may further include 3.0% or less of Zn or at least one member selected from the group consisting of 0.2% or less of In, 0.2% or less of Sn and 0.2% or less of Ga.

Clad aluminum alloy material having high strength and high corrosion

The present invention relates to an aluminum alloy for fins of heat exchangers such as of automobile radiators and evaporators comprising 0.3 to 1.0% by weight of silicon, 0.3 to 3.0% by weight of iron, and the balance of aluminum and unavoidable impurities, which is readily workable for a fin (or readily corrugated), and is less deformed by brazing heat, and yet has improved thermal conductivity after the brazing.

Aluminum alloy fin material for heat exchanger

An aluminum alloy composite material for brazing has a core member made of an aluminum alloy, Al-Si filler member and a cladding member made of an aluminum alloy. Mg contained in the aluminum alloy of the core member is restricted to within 0.2% or less by weight. The aluminum alloy of the cladding member essentially consists of 0.3% to 2.5% by weight of Mg. During brazing, the core member serves to restrain the diffusion of Si from the filler member clad on one surface of the core member and the diffusion of Mg from the cladding member clad on the opposite surface of the core member.

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Kariya, Japan

Mituo Hashiura