Aluminum alloy composite for brazing and heat exchanger including the same

An aluminum alloy composite material for brazing, comprising:

• a core material;
• a brazing material formed of an Al—Si based aluminum alloy on one surface of the core material;
• and a cladding material formed on the other surface of the core material with a cladding ratio of 6 to 30% with respect to an entire thickness of the aluminum alloy composite material, the core material having a composition that consisting essentially of 0.2 mass % or less of Mg, 0.3 mass % or less of Cr, 0.2 mass % or less of Fe, 0.2 to 1.0 mass % of Cu, 0.05 to 1.3 mass % of Si, 0.3 to 1.8 mass % of Mn, and 0.02 to 0.3 mass % of Ti in such a manner that a total content of Cu and Si is in a range of 2.0 mass % or less and a remainder of Al and unavoidable impurities, the cladding material containing 2 to 9 mass % of Zn, 0.3 to 1.8 mass % of Mn, 0.5 to 1.2 mass % of Si, and at least one selected from the group consisting of 0.02 to 0.25 mass % of Fe, 0.01 to 0.30 mass % of Cr, 0.005 to 0.15 mass % of Mg, and 0.001 to 0.15 mass % of Cu, wherein an average Si composition in the cladding material is equal to or less than 0.5 times Si content.

An aluminum alloy composite material for brazing, comprising:

• a core material;
• a brazing material formed of an Al—Si based aluminum alloy on one surface of the core material;
• and a cladding material formed on the other surface of the core material with a cladding ratio of 6 to 30% with respect to an entire thickness of the aluminum alloy composite material, the core material having a composition that consisting essentially of 0.2 mass % or less of Mg, 0.3 mass % or less of Cr, 0.2 mass % or less of Fe, 0.2 to 1.0 mass % of Cu, 0.05 to 1.3 mass % of Si, 0.3 to 1.8 mass % of Mn, 0.02 to 0.3 mass % of Ti, and a remainder of Al and unavoidable impurities, the cladding material containing 2 to 9 mass % of Zn, and at least one selected from the group consisting of 0.3 to 1.8 mass % of Mn and 0.04 to 1.2 mass % of Si, wherein the cladding material further contains precipitates or crystallized particles having an average grain size smaller than 0.1 am with a density of 5.0×108 particles/mm3 or more.