Copper-based brazing alloy and brazing process

US7461770B2 · kind B2 · utility

Assignee

• Vacuumschmelze GmbH & Co. KG · DE

Inventors

• Thomas Hartmann · Friedland, DE
• Dieter Nuetzel · Großkrotzenburg, DE

Key dates

• Filing date: Apr 1, 2005
• Grant date: Dec 9, 2008
• Expiry date: Feb 14, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C9/06
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention proposes a brazing alloy, which can be produced in particular as a homogenous, ductile, amorphous brazing foil and consists of 2 to 20 atom % of nickel, 2 to 12 atom % of tin, 0.5 to 5.0 atom % of zinc, 6 to 16 atom % of phosphorus, remainder copper and incidental impurities. The total amount of copper, nickel, tin and zinc is between 80 and 95 atom %. The addition of more than 0.5 atom % of zinc produces excellent resistance to surface oxidation in air and/or atmospheric humidity. These brazing alloys can be used to produce excellent brazed joints.