Granted Patent B2

US 8,413,876 · App. 13/171,644 · Granted Apr 9, 2013

Abstract

Claims (10)

1. A method of manufacturing a brazed part comprising fluxless brazing under a controlled atmosphere of nitrogen and an aluminum alloy core strip or sheet comprising 0.01 to 0.5% of yttrium, 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;

wherein the core strip or sheet is coated on at least one face with a brazing aluminum alloy 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, and mischmetal.

2. A method according to claim 1 , wherein the core strip or sheet is coated with brazing alloy particles.

3. A method according to claim 2 , wherein the brazing alloy particles are coated with a polymer resin.

4. A method of manufacturion a brazed part comprising fluxless brazing under a comtrolled atmosphere of nitrogen and an aluminum alloy core strip or sheet comprising 0.01 to 0.5% of yttrium, 0.05 to 0.5% 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;

wherein the core strip or sheet is coated on at least one face with a brazing aluminum alloy 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, and mischmetal.

5. A method according to claim 4 , wherein the core strip or sheet is coated with brazing alloy particles.

6. A method according to claim 5 , wherein the brazing alloy particles are coated with a polymer resin.

Assignments (11)