BRAZING SHEET FOR FLUX-FREE BRAZING, METHOD FOR FLUX-FREE BRAZING, AND METHOD FOR HEAT MANUFACTURING HEAT EXCHANGER

Brazing sheet for flux-free brazing, wherein an outermost surface brazing filler metal layer, consisting of an Al-Si-based alloy containing 2 to 13% Si in mass%, and an intermediate brazing filler metal layer, consisting of an Al-Si-Mg-based alloy containing 4 to 13% Si and 0.1 to 5.0% Mg in mass%,...

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Bibliographische Detailangaben
1. Verfasser:	MIYAKE Hideyuki
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ALLOYS CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING FERROUS OR NON-FERROUS ALLOYS LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY PERFORMING OPERATIONS SOLDERING OR UNSOLDERING TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	Brazing sheet for flux-free brazing, wherein an outermost surface brazing filler metal layer, consisting of an Al-Si-based alloy containing 2 to 13% Si in mass%, and an intermediate brazing filler metal layer, consisting of an Al-Si-Mg-based alloy containing 4 to 13% Si and 0.1 to 5.0% Mg in mass%, are cladded on one side or both sides of a core material, and furthermore, in the outermost surface brazing filler metal layer, the number of Si particles having a circle equivalent diameter of 1.75 µm or more among 10% or more of the number of those having a circle equivalent diameter of 0.8 µm or more, as observed in the direction of the surface layer, and the intermediate brazing filler metal layer contains less than 3000 per 10000 µm2of Si particles having a circle equivalent diameter of 0.25 µm or more, as observed in a cross section of the brazing filler metal layer, and wherein aluminum members are joined to each other without using flux in a non-oxidizing gas atmosphere under normal pressure with an oxygen concentration of 100 ppm or less, using the brazing sheets.