US Patent 7771839 Aluminum alloy brazing sheet

An aluminum alloy brazing sheet which has a clad of a sacrificial anode material/a core alloy/an intermediate material/a filler alloy, wherein number density ratios N1/N2 and N1/N3 each are 1.5 or more, in which a number density ((the number of grains)/μm3) of an intermetallic compound having a sphere-equivalent grain diameter of 0.1 μm or less present in the core alloy, the intermediate material, and the sacrificial anode material, is represented by N1, N2, and N3, respectively.