| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy brazing sheet whose strength is improved in spite of small thinness, and which has favorable properties without causing diffusion of filler alloy during brazing, also has excellent strength after brazing, and particularly suitable as a fluid passage forming material for an automobile heat exchanger. SOLUTION: An aluminum alloy brazing sheet having high-strength comprising a core alloy composed of an Al alloy containing 0.5 to 1.0% (mass%, the same applies the below) Si, 0.1 to 0.3% Fe, 0.3 to 1.0% Cu, 1.0 to 1.6% Mn and 0.1 to 0.4% Mg, and containing one or more elements selected from the group consisting of 0.05 to 0.2% Ti, 0.05 to 0.2% Zr and 0.05 to 0.2% V, the balance of Al and unavoidable impurities; and wherein, after the aluminum alloy brazing sheet is subjected to brazing, the core alloy features a metallic structure in which a density of intermetallic compounds having a grain diameter of at least 0.1μm is≤10 pieces/μm<SP>2</SP>, and also, the crystal grain diameter after brazing is≥100μm. The sacrificial anode material is composed of an Al alloy containing 2.0 to 5.0% Zn, the balance of Al and unavoidable impurities. In the brazing sheet, one side of the core alloy is clad with the Al-Si based brazing filler metal, and the other side is clad with the sacrificial anode material. COPYRIGHT: (C)2009,JPO&INPIT
|
