COMPOSITE MATERIAL FOR BRAZING AND BRAZING STRUCTURE

• Main Authors: ISHIO MASAAKI, MAEDA AKIHIRO, HASEGAWA TAKESHI, KAJIKAWA SHUNJI, SAKAMOTO ZENJI
• Format: Patent
• Language: English
• Published: 20.05.2003
• Edition: 7
• 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; 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

PROBLEM TO BE SOLVED: To provide a material for brazing in which the corrosion resistance and the oxidization resistance of a brazing filler metal part with which joined members are brazed are improved and to provide a brazing structure which is suitable for the flow passage structure of a heat exchanger. SOLUTION: The structure is provided with a base plate 11 which is formed by a stainless steel member 11, a Fe-atom-diffusion-suppressing layer 12 which is formed by a Ni-Cr alloy which consists essentially of Ni and includes 10 to 30 mass % Cr, and further provided with, when necessary, a brazing filler metal layer 13 which is formed by a Cu-based brazing filler metal formed as a lamination on the Fe-atom-diffusion-suppressing layer 12. The diffusion of Fe atoms in the base plate into the brazing filler metal which is melted during a brazing process is suppressed by the Fe-atom-diffusion-suppressing layer, and a proper amounts of Ni and Cr are diffused into the brazing filler metal part, thus the excellent corrosion resistance and the oxidization resistance are given to the brazing filler metal part.