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AssigneesDenso Corporation, Sumitomo Light Metal Industries, Ltd.
InventorsTaketoshi Toyama, Koji Hirao, Takashi Hatori, Yuji Hisatomi, Yasunaga Itoh, Yoshifusa Shoji
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The present invention provides an aluminum alloy fin material for heat exchangers which has a thickness of 80 μm (0.08 mm) or less and excels in joinability to a tube material and in intergranular corrosion resistance. The aluminum alloy fin material is an aluminum alloy bare fin material or a brazing fin material which has a thickness of 80 μm or less and is incorporated into a heat exchanger made of an aluminum alloy manufactured by brazing through an Al—Si alloy filler metal. The structure of the core material before brazing is a fiber structure, and the crystal grain diameter of the structure after brazing is 50–250 μm. The Si concentration in the Si dissolution area on the surface of the fin material and at the center of the thickness of the fin material after brazing is preferably 0.8% or more and 0.7% or less, respectively.
An aluminum alloy fin material for heat exchangers which has a thickness of no greater than 80 μm and is incorporated into a heat exchanger made of an aluminum alloy manufactured by brazing through an Al—Si alloy filler metal, wherein the structure of the fin material before brazing is a fiber structure, the crystal grain diameter of the structure of the fin material after brazing is 50–250 μm and the Si concentration in an Si dissolution area in a brazed section at the center of the thickness of the fin material after brazing is no greater than 0.7 mass %.
An aluminum alloy fin material for heat exchangers which has a thickness of no greater than 80 μm and is incorporated into a heat exchanger made of an aluminum alloy manufactured by brazing through an Al—Si alloy filler metal, wherein the fin material is made of an aluminum alloy comprising 0.82–2.0 mass % of Mn, 0.05–0.8 mass % of Fe, Si in an amount not exceeding 1.5 mass %, Cu in an amount not exceeding 0.2 mass % and 0.5–4 mass % of Zn, with the balance being Al and impurities, the structure of the fin material before brazing is a fiber structure and the crystal grain diameter of the structure of the fin material after brazing is 50–250 μm.
An aluminum alloy fin material for heat exchangers which has a thickness of no greater than 80 μm and is incorporated into a heat exchanger made of an aluminum alloy manufactured by brazing through an Al—Si alloy filler metal, wherein a core material comprises the fin material, an Al—Si alloy filler material is clad on both sides of the core material, the structure of the fin material before brazing is a fiber structure, the crystal grain diameter of the structure of the fin material after brazing is 50–250 μm, the fin material is made of an aluminum alloy which comprises 0.8–2.0 mass % of Mn, 0.05–0.8 mass % of Fe, no more than 1.5 mass % of Si and 0.5–4 mass % of Zn, with the balance being Al and impurities, and the filler metal is clad on each side of the core material respectively at a thickness of 3–20% of the total thickness of the fin material and the filler metal.
Dependencies are inferred from the claim text.