Aluminum alloy fin material, aluminum alloy brazing sheet, and heat exchanger

Abstract

An aluminum alloy fin material includes an aluminum alloy containing 1.50 to 5.00 mass % Si with the balance of Al and inevitable impurities, and has the function of being bonded by heating with a single layer. Assuming that in a cross section along the thickness direction of the fin material, the equivalent circle diameter of a Si particle is represented by D, a distance from a surface layer to the center of the Si particle is represented by L, the thickness of the fin material is represented by t, and a length parallel to the surface layer is represented by W, all Si particles that are present in the range of the length W and satisfy D≥L and L+D>0.04 t also satisfy 0≤ΣπD 2 <0.08 tW. An aluminum alloy brazing sheet includes, as a skin material, the fin material that is clad on a core material including an aluminum alloy. A heat exchanger includes the fin material or the brazing sheet that is used in a fin.

1 . An aluminum alloy fin material comprising:
 an aluminum alloy containing 1.50 to 5.00 mass % Si with a balance of Al and inevitable impurities,   wherein assuming that in a cross section along a thickness direction of the fin material, an equivalent circle diameter of a Si particle is represented by D, a distance from a surface layer to a center of the Si particle is represented by L, a thickness of the fin material is represented by t, and a length parallel to the surface layer is represented by W, all Si particles that are present in a range of the length W and satisfy D≥L and L+D>0.04 t also satisfy 0≤ΣπD 2 <0.08 tW.   
     
     
         2 . The aluminum alloy fin material according to  claim 1 , wherein the aluminum alloy further contains one or more selected from 0.01 to 2.00 mass % Fe, 0.05 to 2.00 mass % Mn, 0.05 to 6.00 mass % Zn, and 0.05 to 1.50 mass % Cu. 
     
     
         3 . An aluminum alloy brazing sheet comprising, as a skin material, the fin material according to  claim 1 , wherein the fin material is clad on a core material comprising an aluminum alloy. 
     
     
         4 . A heat exchanger comprising the aluminum alloy fin material according to  claim 1 , wherein the aluminum alloy fin material is used in a fin. 
     
     
         5 . A heat exchanger comprising the aluminum alloy brazing sheet according to  claim 3 , wherein the aluminum alloy brazing sheet is used in a fin. 
     
     
         6 . An aluminum alloy brazing sheet comprising, as a skin material, the fin material according to  claim 2 , wherein the fin material is clad on a core material comprising an aluminum alloy. 
     
     
         7 . A heat exchanger comprising the aluminum alloy fin material according to  claim 2 , wherein the aluminum alloy fin material is used in a fin. 
     
     
         8 . A heat exchanger comprising the aluminum alloy brazing sheet according to  claim 6 , wherein the aluminum alloy brazing sheet is used in a fin.