Method for coating surfaces with hard substances

US4749594A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Willi Malikowski · Aschaffenburg, DE
• Andreas Szulczyk · Gelnhausen, DE
• Wolfgang Boehm · Alzenau, DE
• Wolfgang Weise · Frankfurt, DE
• Ulrich Muerrle · Hanau, DE

Key dates

• Filing date: Oct 7, 1987
• Grant date: Jun 7, 1988
• Expiry date: Oct 7, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B41/89
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

To coat metallic or ceramic surfaces with hard substances by means of brazing, a powder mixture of 60 to 90% silver, 2 to 35% copper, 2 to 30% tin and/or indium and 2 to 20% titanium, zirconium, hafnium, chromium, vanadium, tantalum, niobium, titanium hydride, zirconium hydride and/or hafnium hydride together with an organic binder and then the hard-substance powder are deposited on the surface and heated to 900.degree. to 1200.degree. C. The particle sizes of the metallic powders must be less than the particle size of the hard-substance powder.