| 摘要 |
PURPOSE:To develop a heat exchanger having excellent heat conductivity and heat exchangeability by joining a fin of a brazing sheet consisting of a specifically composed Al alloy core material and an Al-Si alloy facing material to an Al metal tube having the potential nobler than said fin. CONSTITUTION:A brazing sheet 5 havig 0.13-0.2mm. thickness is formed by cladding an Al-Si alloy or Al-Si-Mg alloy facing material 4 onto a core material 3 of an Al alloy consisting of <0.2% Fe, <0.1% Si, 0.01-0.3% Zr, 0.05-1.0% Zn and the balance Al as a fin for a heat exchanger. Such sheet is formed to a corrugated shape and is then brazed to a pure Al tube 1 which has a hole 2 for passage of a refrigerant and is nobler in potential than the fin material 5 to manufacture a heat exchanger. The heat exchanger which obviates buckling of the fins during brazing, and has a sacrificial anode effect and excellent heat conductivity is manufactured.
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