HEAT EXCHANGER MADE FROM ALUMINUM ALLOY, AND PROCESS FOR PRODUCTION OF COOLANT PASSAGE TUBE FOR USE IN THE HEAT EXCHANGER

An aluminum alloy heat exchanger is produced by applying a coating material that is prepared by adding a binder to a mixture of an Si powder and a Zn-containing compound flux powder to a surface of an aluminum alloy refrigerant tube, assembling a bare fin that is formed of an Al-Mn-Zn alloy with the...

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Bibliographische Detailangaben
Hauptverfasser:	YAMASHITA, Naoki, ITOH, Yasunaga, HISATOMI, Yuji
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ALLOYS BLASTING CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION FERROUS OR NON-FERROUS ALLOYS HEAT EXCHANGE IN GENERAL HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS,IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT HEATING LIGHTING MACHINE TOOLS MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY PERFORMING OPERATIONS PUNCHING METAL SOLDERING OR UNSOLDERING TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS WELDING WORKING BY LASER BEAM WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	An aluminum alloy heat exchanger is produced by applying a coating material that is prepared by adding a binder to a mixture of an Si powder and a Zn-containing compound flux powder to a surface of an aluminum alloy refrigerant tube, assembling a bare fin that is formed of an Al-Mn-Zn alloy with the refrigerant tube, and brazing the refrigerant tube and the bare fin by heating in an atmosphere-controlled furnace, the refrigerant tube being an extruded product of an aluminum alloy that comprises 0.5 to 1.7% (mass%, hereinafter the same) of Mn, less than 0.10% of Cu, and less than 0.10% of Si, with the balance being Al and unavoidable impurities, a mixing ratio of the Si powder to the Zn-containing compound flux powder being 10:90 to 40:60, the binder being added in an amount of 5 to 40% based on the total amount of the coating material, the coating material being applied to an outer surface of the refrigerant tube so that the total amount of the Si powder and the Zn-containing compound flux powder is 5 to 30 g/m 2 , the surface of the refrigerant tube subjected to brazing having a potential lower than that of an area of the refrigerant tube that is deeper than a diffusion depth of Si and Zn by 20 to 200 mV, and a potential of the fin being lower than that of a deep area of the refrigerant tube.