Uacj Corporation

Denso Corporation

Kabushiki Kaisha Kobe Seiko Sho

Takahiro Shinoda

Shogo Yamada

Tomoki Yamayoshi

Naoki Sugimoto

Taketoshi Toyama

Nobuhiro Honma

Atsushi Fukumoto

Hirokazu Tanaka

Hidetoshi Kumagai

Shinichi Nakamura

Tomohiro Shoji

Tatsuya Ide

Yutaka Yanagawa

Akihiro Tsuruno

Shimpei Kimura

Takahiro Izumi

Yoshiyuki Oya

Shingo Oono

Yoshihiko Sonoda

Yuji Shibuya

Yusuke Ohashi

Shinichiro Takise

Takeyoshi Dokou

Naoto Goto

Yoshihiko Kyo

Shingo Ono

Koichi Nakashita

An aluminum alloy heat exchanger includes a core material formed of an aluminum alloy comprising Mn of 0.60 to 2.00 mass % and Cu of 1.00 mass % or less, with the balance being Al and inevitable impurities, and a sacrificial anode material formed of an aluminum alloy comprising Zn of 2.50 to 10.00 mass %, with the balance being Al and inevitable impurities. Pitting potential of a sacrificial anode material surface of a tube of the aluminum alloy heat exchanger in a 5% NaCl solution is −800 (mV vs Ag/AgCl) or less, and pitting potential of an aluminum fin of the aluminum alloy heat exchanger in a 5% NaCl solution is less than the pitting potential of the sacrificial anode material surface of the tube of the aluminum alloy heat exchanger in a 5% NaCl solution.

Aluminum alloy heat exchanger

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

A method of manufacturing a fin material made of an aluminum alloy for heat exchangers with no fin buckling deformation and having excellent buckling resistance in a temperature range of 400° C. to 580° C. before a filler alloy melts at the time of brazing is provided. The fin material made of an aluminum alloy for heat exchangers contains 1.0 to 2.0 mass % of Mn, 0.7 to 1.4 mass % of Si, and 0.05 to 0.3 mass % of Fe, with the balance being Al and unavoidable impurities, in which a number density of intermetallic compounds having a circle-equivalent diameter of 0.025 to 0.4 μm is 3.0×10particles/mmor more, and an amount of solid solution of Mn is 0.3 mass % or less.

Fin material made of aluminum alloy for heat exchanger

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

A flux-free brazing aluminum alloy brazing sheet includes: a core material formed of aluminum alloy comprising Si of 0.50 to 0.90 mass %, Cu of 0.30 to 2.50 mass %, and Mn of 1.40 to 1.80 mass %, with a Mg content limited to 0.05 mass % or less, and with the balance being Al and inevitable impurities; an intermediate material being formed of aluminum alloy comprising Mg of 0.40 to 1.00 mass %, and Zn of 2.00 to 6.00 mass %, with the balance being Al and inevitable impurities; and a brazing material being formed of aluminum alloy comprising Si of 6.00 to 13.00 mass %, Mg of 0.05 to 0.40 mass %, and Bi of 0.010 to 0.050 mass %, with the balance being Al and inevitable impurities.

Flux-free brazing aluminum alloy brazing sheet

Growing community of inventors

Aichi, Japan

Takahiro Shinoda