Patent ID: 7247392
Filing Date: 2007-07-24
Classification: F28F,Y10S,Y10T

Abstract:
1. An aluminum alloy heat exchanger having a tube, wherein the tube is composed of a thin aluminum alloy clad material, in which one face of an aluminum alloy core material having an Si content of 0.05 to 1.0% by mass is clad with an Al—Si-series filler material containing 5 to 20% by mass of Si, and in which the other face of the core material is clad with a sacrificial material containing at least one selected from the group consisting of 2 to 10% by mass of Zn and 1 to 5% by mass of Mg, and wherein an element diffusion profile of the aluminum alloy clad material after heating for brazing as determined by EPMA from a filler material side satisfies the following expression (1) when the sacrificial material contains Zn, and the following expression (2) when the sacrificial material contains Mg: wherein L represents a thickness (μm) of a wall of the tube; L L wherein L and L L wherein a thickness of the aluminum alloy clad material after heating for brazing is 0.23 mm or less, wherein an average crystal grain diameter of recrystallized crystals of the core material of the aluminum alloy clad material after heating for brazing is 180 μm or more; and wherein the aluminum alloy heat exchanger has a clad ratio of the filler material of 7% or more and less than 13%, and a clad ratio of the sacrificial material of 4% or more and less than 16.5%; or the aluminum alloy heat exchanger has a clad ratio of the filler material of 7% or more and less than 20%, and a clad ratio of the sacrificial material of 4% or more and less than 30%.