Ternary active brazing based on a zirconium-nickel alloy

US5334344A · kind A · utility

Assignee

• Endress u Hauser GmbH u Co. · DE

Inventors

• Frank Hegner · Bad Kötzting, DE
• Elke Schmidt · Bad Säckingen, DE
• Thomas Klahn · Glückstadt, DE
• Peter Reimann · Gelterkinden, CH
• Heinz Breitenstein · Bättwil, CH
• Stephan Messmer · Basel, CH

Key dates

• Filing date: Nov 12, 1991
• Grant date: Aug 2, 1994
• Expiry date: Nov 12, 2011

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K35/32
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

This active brazing preferably serves to braze (join) ((aluminum-)oxide-)ceramic parts or single crystals or metal parts or to braze (join) ((aluminum-)oxide-)ceramic parts to single crystals or ((aluminum-)oxide-)ceramic parts or single crystals to metal parts. In addition to the zirconium-nickel alloy, which is composed of 70 atom % to 85 atom % zirconium and 15 atom % to 30 atom % nickel, it contains titanium. In an apparatus for fabricating a foil (6) from this ternary active-brazing alloy by melt spinning which has a uniform thickness and two surfaces that are as smooth as possible, the alloy, after being melted by high-frequency heating in a cylindrical crucible (1) made completely of a high-temperature-resistant and highly thermally conductive nonmetallic material, particularly of high-density graphite or of boron nitride, is forced through an opening (3) in the bottom of the crucible onto a metal drum (5) of high thermal conductivity rotating at a high circumferential speed, on which the liquid alloy solidifies at a cooling rate on the order of 10.sup.3 .degree. to 10.sup.6 .degree. C./s. A product made using this ternary active brazing is a pressure sensor (10 ) having a s…