BRAZING SHEET FOR HEAT EXCHANGER, JOINT STRUCTURE OF BRAZING SHEET FOR HEAT EXCHANGER, METHOD FOR JOINING BRAZING SHEET FOR HEAT EXCHANGER, AND HEAT EXCHANGER

• Main Authors: NAKAJIMA Takahito, YAMAMOTO Noriaki, HIROTA Masanobu
• Format: Patent
• Language: English; French; Japanese
• Published: 15.04.2021
• Subjects: 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; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS; WELDING; WORKING BY LASER BEAM

A brazing sheet (10) used in a heat exchanger according to the present invention is provided with a core material (11) composed of an aluminum alloy, a brazing material layer (12), and a sacrificial positive electrode material layer (13) containing zinc, and has a joint surface (10a) constituting a joint portion (21) and a non-joint adjacent surface (10b) adjacent to the joint surface (10a). The joint surface (10a) is defined by joining the sacrificial positive electrode material layers (13). A fillet (22) is formed at a portion between the non-joint adjacent surfaces (10b) and adjacent to the joint surface (10a). This sacrificial positive electrode material contains zinc in the range of 0.5-6.0 mass% and silicon in the range of 3.0-11 mass%, both this brazing material and this sacrificial positive electrode material contain no copper, and the core material contains copper in the range of 0.3-1.2 mass%. La feuille de brasage (10) pour échangeur thermique selon l'invention comporte: un matériau central (11) en alliage d'aluminium; une couche (12) de métal de brasage; et une couche (13) de matériau d'anode sacrificielle contenant du zinc. Cette feuille possède en outre une face d'assemblage (10a) qui constitue une partie d'assemblage (21) et une face adjacente de non-assemblage (10b) adjacente à la face d'assemblage (10a). La couche d'assemblage (10a) est similaire à la couche (13) de matériau d'anode sacrificielle. Un congé de raccordement (22) est formé de façon adjacente à la face d'assemblage (10a), entre deux surfaces de non assemblage (10b). Le matériau d'électrode sacrificielle contient 0,5 à 6,0 % en poids de zinc et 3,0 à 11 % en poids de silicium. Le métal d'apport de brasage et le matériau d'anode sacrificielle ne contiennent pas de cuivre, et le matériau central contient 0,3 à 1,2 % en poids de cuivre. 本発明の熱交換器に用いられるブレージングシート（１０）は、アルミニウム合金製の心材（１１）、ろう材層（１２）、および亜鉛を含有する犠牲陽極材層（１３）を備え、接合部（２１）を構成する接合面（１０ａ）と接合面（１０ａ）に隣接する非接合隣接面（１０ｂ）とを有する。接合面（１０ａ）は犠牲陽極材層（１３）同士である。それぞれの非接合隣接面（１０ｂ）の間であって接合面（１０ａ）に隣接する部位には、フィレット（２２）が形成される。犠牲陽極材には亜鉛が０．５～６．０質量％、シリコンが３．０～１１質量％の範囲内で含有されており、ろう材および犠牲陽極材は、いずれも銅を含有せず、心材には銅が０．３～１．２質量％の範囲内で含有されている。