Aluminium alloy strip for brazing

Abstract

The invention relates to a strip or sheet of aluminium alloy, comprising at least 80% by weight of aluminium and 0.01 to 0.5% yttrium and/or 0.05 to 0.5% bismuth, coated on at least one face with a brazing alloy. Said sheets and strips are used for the production of pieces by non-flux brazing.

1 . Aluminum core alloy strip or sheet containing at least 80% by weight of aluminum, 0.01 to 0.5% of yttrium and/or 0.05 to 0.5% of bismuth, and the following elements included in the following percentages by weight: 
 Si<1.0; Fe<1.0; Cu<1.0; Mn<2.0; Mg<3.0; Zn<6.0; Ti<0.3; Zr<0.3; Cr<0.3; Hf<0.6; V<0.3; Ni<2.0; Co<2.0; In<0.3; Sn<0.3; other elements<0.05 each and 0.15 total,    the strip or sheet being coated on at least one face with a brazing aluminum alloy.    
     
     
         2 . Strip or sheet according to  claim 1 , characterized in that the brazing alloy is an alloy containing 4 to 15% by weight of silicon.  
     
     
         3 . Strip or sheet according to  claim 1 , characterized in that the brazing alloy contains at least one element for modifying the surface tension of the alloy, the element selected from the group consisting of Ag, Be, Bi, Ce, La, Pb, Pd, Sb, Y or mischmetal.  
     
     
         4 . Strip or sheet according to  claim 1 , characterized in that the brazing alloy coating is a clad layer obtained by co-rolling with the basic aluminum alloy.  
     
     
         5 . Strip or sheet according to  claim 1 , characterized in that the brazing alloy coating includes one or more particles.  
     
     
         6 . Brazed part made using an aluminum alloy strip or sheet containing 0.01 to 0.5% of yttrium and/or 0.05 to 0.5% of bismuth, and the following elements included in the following percentages by weight: 
 Si<1.0; Fe<1.0; Cu<1.0; Mn<2.0; Mg<3.0; Zn<6.0; Ti<0.3; Zr<0.3; Cr<0.3; Hf<0.6; V<0.3; Ni<2.0; Co<2.0; In<0.3; Sn<0.3; other elements<0.05 each and 0.15 total.    
     
     
         7 . Brazed part according to  claim 6 , characterized in that the strip or sheet used is coated with a brazing alloy.  
     
     
         8 . Brazed part according to  claim 7 , characterized in that the strip or sheet used is coated with brazing alloy particles.  
     
     
         9 . Strip or sheet according to  claim 5 , wherein the particles comprise a resin layer.  
     
     
         10 . Brazed part according to  claim 8 , wherein the brazing alloy particles are coated by a polymer resin.  
     
     
         11 . An aluminum alloy component for the assembly of parts by fluxless brazing comprising at least about 80% by weight of aluminum, and 0.01 to 0.5% of yttrium and/or 0.05 to 0.5% of bismuth, wherein at least one face of the aluminum alloy component is coated with a brazing alloy.  
     
     
         12 . The aluminum alloy component according to  claim 11 , wherein the brazing alloy is an alloy containing 4 to 15% by weight of silicon.  
     
     
         13 . The aluminum alloy component according to  claim 11 , wherein the brazing alloy contains at least one element for modifying the surface tension of the alloy, the element selected from the group consisting of Ag, Be, Bi, Ce, La, Pb, Pd, Sb, Y or mischmetal.  
     
     
         14 . The aluminum alloy component according to  claim 11 , wherein the brazing alloy coating is a clad layer obtained by co-rolling with the basic aluminum alloy.  
     
     
         15 . The aluminum alloy component according to  claim 11 , characterized in that the brazing alloy coating includes one or more particles.  
     
     
         16 . The aluminum alloy component according to  claim 15 , wherein the particles comprise a resin layer coating the aluminum alloy component.  
     
     
         17 . The aluminum alloy component according to  claim 11 , wherein the component includes the following elements in the following percentages by weight: 
 Si<1.0; Fe<1.0; Cu<1.0; Mn<2.0; Mg<3.0; Zn<6.0; Ti<0.3; Zr<0.3; Cr<0.3; Hf<0.6; V<0.3; Ni<2.0; Co<2.0; In<0.3; Sn<0.3; other elements<0.05 each and 0.15 total.