# US 5,350,436 A · Aluminum alloy composite material for brazing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,350,436 A - Document ID: US5350436A - Status: Granted - Kind: A - Application number: 08/156,827 - Filed: 1993-11-24 - Granted: 1994-09-27 - Earliest claimed: 1992-11-24 - Assignees: Kobe Alcoa Transportation Products Ltd.; Nippondenso Co., Ltd. - Inventors: Osamu Takezoe; Jun Takigawa; Tadashi Okamoto; Mituo Hashiura; Sunao Fukuda; Keizo Takeuchi; Yasuaki Isobe - Web page: https://patentgrep.com/patent/US5350436A ## CPC - C22C 21/00: Alloys based on aluminium - B23K 35/286: {Al as the principal constituent} - B32B 15/016: {all layers being formed of aluminium or aluminium alloys} - C22C 21/02: with silicon as the next major constituent - C22C 21/06: with magnesium as the next major constituent - C22C 21/10: with zinc as the next major constituent - F28F 13/12: by creating turbulence, e.g. by stirring, by increasing the force of circulation (F28F13/08 takes precedence) - F28F 21/084: {from aluminium or aluminium alloys} - F28F 21/089: {Coatings, claddings or bonding layers made from metals or metal alloys (F28F19/06 takes precedence)} - B23K 35/0238: {layered} - Y10T 428/12028: Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.] - Y10T 428/12764: Next to Al-base component - C22C: ALLOYS (treatment of alloys C21D, C22F) - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An aluminum alloy composite material for brazing has a core member, an Al--Si filler member clad on one surface of the core member and an aluminum alloy cladding member clad on the other side of the core member. The core member is made of an aluminum alloy containing 0.3 to 1.3 wt. % of Si, 0.3 to 1.5 wt. % of Mn, 0.02 to 0.3 wt. % of Ti, and, as required, 0.3 wt. % or less of Cr and 0.2 wt. % or less of Zr, the content of Mg being restricted to 0.2 wt. % or less and the content of the Cu being restricted to 0.2 wt. % or less as an impurity. The cladding member is made of an aluminum alloy containing 0.3 to 3 wt. % of Mg, 5 wt. % or less of Zn, 0.1 to 1.0 wt. % of Si. The thickness of the core member is preferably, 2.5 times or more greater than that of the filler member, falling within a range of 0.1 to 1 mm. With this, it is possible to obtain an aluminum alloy composite material which cannot degraded in brazability and corrosion resistance even when brazed by the brazing method with noncorrosive flux and which has enough high strength to be used for a material of a high-strength heat exchanger, highly improved corrosion resistance and excellent brazability. ## Claims ### Claim 1 An aluminum alloy composite material for brazing comprising: a core member made of an aluminum alloy consisting essentially of 0.3 to 1.3 wt. % of Si, 0.3 to 1.5 wt. % of Mn and 0.02 to 0.3 wt. % of Ti, the content of Mg being restricted to 0.2 wt. % or less and the content of Cu being restricted to 0.2 wt. % or less as impurity; an Al--Si filler member clad on one surface of said core member; and a cladding member of an aluminum alloy clad on the opposite side of said core member, consisting essentially of 0.3 to 3 wt. % of Mg, 5 wt. % or less of Zn and 0.1 to wt. % of Si. ### Claim 2 An aluminum alloy composite material for brazing comprising: a core member made of an aluminum alloy consisting essentially of 0.3 to 1.3 wt. % of Si, 0.3 to 1.5 wt. % of Mn, 0.02 to 0.3 wt. % of Ti, 0.3 wt. % or less of Cr and 0.2 wt. % or less of Zr, the content of Mg being restricted to 0.2 wt. % or less and the content of Cu being restricted to 0.2 wt. % or less as impurity; an Al--Si filler member clad on one surface of said core member; and a cladding member of an aluminum alloy clad on the opposite side of said core member, consisting essentially of 0.3 to 3 wt. % of Mg, 5 wt. % or less of Zn and 0.1 to 1.0 wt. % of Si. ### Claim 3 An aluminum alloy composite material for brazing comprising: a core member made of an aluminum alloy consisting essentially of 0.3 to 1.3 wt. % of Si, 0.3 to 1.5 wt. % of Mn, 0.02 to 0.3 wt. % of Ti and 0.02 to 0.3 wt. % of Cr, the content of Mg being restricted to 0.2 wt. % or less and the content of Cu being restricted to 0.2 wt. % or less as an impurity; an Al--Si filler member clad on one surface of said core member; and a cladding member of an aluminum alloy clad on the opposite side of said core member, consisting essentially of 0.3 to 3 wt. % of Mg, 5 wt. % or less of Zn and 0.1 to wt. % of Si. ### Claim 4 An aluminum alloy composite material for brazing comprising: a core member made of an aluminum alloy, consisting essentially of 0.3 to 1.3 wt. % of Si, 0.3 to 1.5 wt. % of Mn, 0.02 to 0.3 wt. % of Ti, 0.02 to 0.3 wt. % of Cr and 0.2 wt. % or less of Zr, the content of Mg being restricted to 0.2 wt. % or less and the content of Cu being restricted to 0.2 wt. % or less as an impurity; an Al--Si filler member clad on one surface of said core member; and a cladding member of an aluminum alloy clad on the opposite side of said core member, consisting essentially of 0.3 to 3 wt. % of Mg, 5 wt. % or less of Zn and 0.1 to 1.0 wt. % of Si. ### Claim 5 An aluminum alloy composite material for brazing comprising: a core member made of an aluminum alloy, consisting essentially of 0.3 to 1.3 wt. % of Si, 0.3 to 1.5 wt. % of Mn, 0.02 to 0.3 wt. % of Ti, the content of Mg being restricted to 0.2 wt. % or less and the content of Cu being restricted to 0.2 wt. % or less as an impurity; an Al--Si filler member clad on one surface of said core member; and a cladding member of an aluminum alloy clad on the opposite side of said core member, consisting essentially of 0.3 to 3 wt. % of Mg, 2.1 to 5 wt. % of Zn and 0.1 to 1.0 wt. % of Si. ### Claim 6 An aluminum alloy composite material for brazing comprising: a core member made of an aluminum alloy consisting essentially of 0.3 to 1.3 wt. % of Si, 0.3 to 1.5 wt. % of Mn, 0.02 to 0.3 wt. % of Ti, 0.3 wt. % or less of Cr and 0.2 wt. % or less of Zr, the content of the Mg being restricted to 0.2 wt. % or less and the content of Cu being restricted to 0.2 wt. % or less as an impurity; an Al--Si filler member clad on one surface of said core member; and a cladding member of an aluminum alloy clad on the opposite side of said core member, consisting essentially of 0.3 to 3 wt. % Of Mg, 2.1 to 5 Wt. % of Zn and 0.1 to 1.0 wt. % of Si. ### Claim 7 (depends on 1) The aluminum alloy composite material for brazing according to claim 1, wherein said core member has a thickness 2.5 times or more greater than that of said filler member and falling within a range of 0.1 to 1 mm. ### Claim 8 (depends on 2) The aluminum alloy composite material for brazing according to claim 2, wherein said core member has a thickness 2.5 times or more greater than that of said filler member and falling within a range of 0.1 to 1 mm. ### Claim 9 (depends on 3) The aluminum alloy composite material for brazing according to claim 3, wherein said core member has a thickness 2.5 times or more greater than that of said filler member and falling within a range of 0.1 to 1 mm. ### Claim 10 (depends on 4) The aluminum alloy composite material for brazing according to claim 4, wherein said core member has a thickness 2.5 times or more greater than that of said filler member and falling within a range of 0.1 to 1 mm. ### Claim 11 (depends on 5) The aluminum alloy composite material for brazing according to claim 5, wherein said core member has a thickness 2.5 times or more greater than that of said filler member and falling within a range of 0.1 to 1 mm. ### Claim 12 (depends on 6) The aluminum alloy composite material for brazing according to claim 6, wherein said core member has a thickness 2.5 times or more greater than that of said filler member and falling within a range of 0.1 to 1 mm. ### Claim 13 (depends on 1) A tube member in which said aluminum alloy composite material for brazing according to claim 1 is welded into a tube with said filler member outside by the high frequency induction welding. ### Claim 14 (depends on 13) The tube member according to claim 13, wherein said tube is fabricated into a radiator by the brazing method with noncorrosive flux. ### Claim 15 (depends on 14) The tube member according to claim 14, wherein, after brazing, said core member has a pitting potential (positive) higher than a pitting potential of said cladding member and higher than a pitting potential of said filler member, and the differences in pitting potential between said core member and said cladding member and between said core member and said filler member fall in the range of from 30 to 120 mV. ### Claim 16 (depends on 2) A tube member in which said aluminum alloy composite material for brazing according to claim 2 is welded into a tube with said filler member outside by the high frequency induction welding. ### Claim 17 (depends on 16) The tube member according to claim 16, wherein said tube is fabricated into a radiator by the brazing method with noncorrosive flux. ### Claim 18 (depends on 17) The tube member according to claim 17, wherein, after brazing, said core member has a pitting potential (positive) higher than a pitting potential of said cladding member and higher than a pitting potential of said filler member, and the differences in pitting potential between said core member and said cladding member and between said core member and said filler member fall in the range of from 30 to 120 mV. ### Claim 19 (depends on 3) A tube member in which said aluminum alloy composite material for brazing according to claim 3 is welded into a tube with said filler member outside by the high frequency induction welding. ### Claim 20 (depends on 19) The tube member according to claim 19, wherein said tube is fabricated into a radiator by the brazing method with noncorrosive flux. ### Claim 21 (depends on 20) The tube member according to claim 20, wherein, after brazing, said core member has a pitting potential (positive) higher than a pitting potential of said cladding member and higher than a pitting potential of said filler member, and the differences in pitting potential between said core member and said cladding member and between said core member and said filler member fall in the range of from 30 to 120 mV. ### Claim 22 (depends on 4) A tube member in which said aluminum alloy composite material for brazing according to claim 4 is welded into a tube with said filler member outside by the high frequency induction welding. ### Claim 23 (depends on 22) The tube member according to claim 22, wherein said tube is fabricated into a radiator by the brazing method with noncorrosive flux. ### Claim 24 (depends on 23) The tube member according to claim 23, wherein, after brazing, said core member has a pitting potential (positive) higher than a pitting potential of said cladding member and higher than a pitting potential of said filler member, and the differences in pitting potential between said core member and said cladding member and between said core member and said filler member fall in the range of from 30 to 120 mV. ### Claim 25 (depends on 5) A tube member in which said aluminum alloy composite material for brazing according to claim 5 is welded into a tube with said filler member outside by the high frequency induction welding. ### Claim 26 (depends on 25) The tube member according to claim 25, wherein said tube is fabricated into a radiator by the brazing method with noncorrosive flux. ### Claim 27 (depends on 26) The tube member according to claim 26, wherein, after brazing, said core member has a pitting potential (positive) higher than a pitting potential of said cladding member and higher than a pitting potential of said filler member, and the differences in pitting potential between said core member and said cladding member and between said core member and said filler member fall in the range of from 30 to 120 mV. ### Claim 28 (depends on 6) A tube member in which said aluminum alloy composite material for brazing according to claim 6 is welded into a tube with said filler member outside by the high frequency induction welding. ### Claim 29 (depends on 28) The tube member according to claim 28, wherein said tube is fabricated into a radiator by the brazing method with noncorrosive flux. ### Claim 30 (depends on 29) The tube member according to claim 29, wherein, after brazing, said core member has a pitting potential (positive) higher than a pitting potential of said cladding member and higher than a pitting potential of said filler member, and the differences in pitting potential between said core member and said cladding member and between said core member and said filler member fall in the range of from 30 to 120 mV.