Active brazing solder for brazing alumina-ceramic parts

• US 20020155020A1
• Filed: 06/12/2002
• Published: 10/24/2002
• Est. Priority Date: 07/25/1996
• Status: Active Grant

• Current Assignee: Endress + Hauser GmbH + Company GFE Metalle und Materialien Gesellschaft mbH and PROF Dr Jurgen Breme
• Original Assignee: Endress + Hauser GmbH + Company GFE Metalle und Materialien Gesellschaft mbH and PROF Dr Jurgen Breme
• Inventors: Muller, Heinz, Allo, Anobecs, Turnsek, Jurgen Peter, Hegner, Frank, Guther, Volker, Schmidt, Elke Maria, Breme, Jurgen
• Granted Patent: US 6,770,377 B2
• Time in Patent Office: Days
• US Class Current: 420/422
• CPC Class Codes: B22F 9/023 Hydrogen absorption
• CPC Class Codes: B23K 35/32 with the principal constituent melting at more than 1550 degrees C
• CPC Class Codes: C04B 2237/122 based on refractory metals
• CPC Class Codes: C04B 2237/127 The active component for bonding being a refractory metal
• CPC Class Codes: C04B 2237/343 Alumina or aluminates
• CPC Class Codes: C04B 37/006 consisting of metals or metal salts

Abstract

The active brazing solder for brazing ceramic parts of alumina, particularly of high-purity alumina, contains a maximum of 12 wt. % Ti, a maximum of 8 wt. % Be, and less than 16.5 wt. % Fe, the remainder being Zr and any impurities that may be present. The active brazing solder has the following behaviour/features: Brazing temperature: lower than 1,000 ° C.; the brazed joint is high-vacuum-tight over a long period of time; the coefficient of thermal expansion of the active brazing alloy is substantially identical to that of the alumina ceramic in the entire temperature range covered during the brazing process; the strength of the brazed joint between the two ceramic parts is so high that under tensile loading, fracture will result not at the joint, but in the adjacent ceramic; the pressure resistance of the active brazing solder is greater than 2 GPa; the active brazing solder is very good processable into powders having particle sizes on the order of 10 μm.

Claims

1. An active brazing solder for brazing alumina-ceramic parts which contains a maximum of 12 wt. % titanium, a maximum of 8 wt. % beryllium, and less than 16.5 wt. % iron, the remainder being zirconium and any impurities that may be present.

2. An active brazing solder as claimed in claim 1 which contains 8.6 wt. % titanium, 4 wt. % beryllium, and 15.8 wt. % iron.

3. An active brazing solder as claimed in claim 1 which contains 8.8 wt. % titanium, 2 wt. % beryllium, and 16.2 wt. % iron.

4. An active brazing solder as claimed in claim 1 which contains 8.9 wt. % titanium, 1 wt. % beryllium, and 16.3 wt. % iron.

5. An active brazing solder as claimed in claim 1 which contains 10 wt. % titanium and 4 wt. % beryllium, but no iron.