Phosphorous-copper base brazing alloy

• US 20050249629A1
• Filed: 07/28/2003
• Published: 11/10/2005
• Est. Priority Date: 08/23/2002
• Status: Active Grant

• Current Assignee: Lincoln Global Incorporated (Lincoln Electric Holdings Incorporated)
• Original Assignee: J.W. Harris Co., Inc (Lincoln Electric Holdings Incorporated)
• Inventors: Harris, Joseph W.
• Granted Patent: US 9,533,379 B2
• Time in Patent Office: Days
• US Class Current: 420/472
• CPC Class Codes: B23K 35/0222 for use in soldering, brazing B23K35/0205 takes precedence
• CPC Class Codes: B23K 35/0227 Rods, wires B23K35/0244 takes precedence
• CPC Class Codes: B23K 35/0233 Sheets, foils B23K35/0244 takes precedence
• CPC Class Codes: B23K 35/0244 Powders, particles or spheres; Preforms made therefrom
• CPC Class Codes: B23K 35/30 with the principal constituent melting at less than 1550 degrees C
• CPC Class Codes: B23K 35/302 Cu as the principal constituent

Abstract

A solid phos-copper base or silver-phos-copper base brazing alloy component for forming a brazed joint with a raised shoulder, little to no black oxide, and improved corrosion resistance. The brazing alloys of the present invention are visually distinguishable from copper and copper alloy parts. The solid brazing components of the present invention may be used in forming brazed joints at low brazing temperatures and result in a joint that is strong, ductile, smooth and corrosion resistant. The solid brazing components are provided in the form of wire, strip, foil or preform, and thus are advantageously used in a wide variety of brazing applications including copper tubing. The brazing components of the present invention are made of an alloy having a liquidus temperature above 840° F. and consist essentially of about 4-9% phosphorus, about 0.1-10% tin, up to about 4% antimony, about 0.1-15% nickel, up to about 3% silicon, up to about 18% silver, up to about 3% manganese, with the balance being copper. Exemplary embodiments include about 6-15% silver and/or 5-8% nickel.

Claims

1. A solid brazing component having a liquidus temperature above 840°

F. selected from the group consisting of wire, strip, foil and preforms, wherein the brazing component is made of an alloy consisting essentially of, in weight percent;

(a) about 4-9% phosphorus;

(b) about 0.1-10% tin;

(c) about 0.1-15% nickel;

(d) about 0.1-18% silver;

(e) up to about 3% silicon;

(f) up to about 4% antimony;

(g) up to about 3% manganese; and

the balance copper.

5. The component of claim 1 wherein the brazing component has a liquidus temperature less than about 1410°

F. and a solidus temperature less than about 1100°

F.

6. The component of claim 5 wherein the alloy consists essentially of:

(b) about 4-8% tin;

(c) about 5-8% nickel;

(d) about 1-18% silver; and

(e) about 0.001-0.1% silicon.

7. The component of claim 6 wherein the alloy exhibits a major thermal arrest at a temperature below about 1250°

F.

2-4. -4. (canceled)

8-13. -13. (canceled)

14-21. -21. (canceled)

22. A solid brazing component having a liquidus temperature above 840°

F. selected from the group consisting of wire, strip, foil and preforms, wherein the brazing component is made of an alloy consisting essentially of, in weight percent;

(a) about 4-9% phosphorus;

(b) about0.1-10% tin;

(c) about 0.1-15% nickel;

(d) up to about 18% silver;

(e) about 0.001-3% silicon;

(f) up to about 4% antimony;

(g) up to about 3% manganese; and

the balance copper.

25. The component of claim 22 wherein the alloy consists essentially of:

(c) about 5-8% nickel.

23-24. -24. (canceled)

26-34. -34. (canceled)

35. A solid brazing component having a liquidus temperature above 840°

F. selected from the group consisting of;

wire, strip, foil and preforms, wherein the brazing component is made of an alloy consisting essentially of, in weight percent;

(a) about 4-10% phosphorus;

(b) about 0.1-8% tin;

(c) about 0.001-3% silicon;

(d) up to about 3% nickel;

(e) up to about 18% silver;

(f) up to about 4% antimony;

(g) up to about 3% manganese; and

the balance copper, with the proviso that the sum of tin and antimony does not exceed about 10%.

36. The component of claim 35 wherein the brazing component has a liquidus temperature less than about 1300°

F. and a solidus temperature less than about 1200°

F.

37. The component of claim 35 wherein the alloy consists essentially of:

(a) about 6-7% phosphorus;

(b) about 2-8% tin;

(c) about 0.001-0.1% silicon;

(f) up to about 2% antimony; and

the balance copper.

38. The component of claim 37 wherein the alloy exhibits a major thermal arrest at a temperature below about 1275°

F.

39. A fluxless solid brazing component having a liquidus temperature above 840°

F. selected from the group consisting of;

wire, strip, foil and preforms, wherein the brazing component consists of, in weight percent;

(a) about 4-10% phosphorus;

(b) about 0.1-8% tin

(c) about 0.001-3% silicon;

(d) up to about 3% nickel;

(e) up to about 18% silver;

(f) up to about 4% antimony;

(g) up to about 3% manganese; and

the balance copper, with the proviso that the sum of tin and antimony does not exceed about 10%.

40. The component of claim 39 wherein the brazing component has a liquidus temperature less than about 1300°

F. and a solidus temperature less than about 1200°

F.

41. The component of claim 39 wherein the brazing component consists of:

(a) about 6-7% phosphorus;

(b) about 2-8% tin;

(c) about 0.001-0.1% silicon;

(f) up to about 2% antimony; and

the balance copper.

42. The component of claim 41 wherein the alloy exhibits a major thermal arrest at a temperature below about 1275°

F.