Melting method for producing an inclusion-free Ta-base alloy

US8636825B2 · kind B2 · utility

Assignee

• W. C. Heraeus GmbH · DE

Inventors

• Herwig Schiefer · Frankfurt, DE
• Christoph Vogt · Hanau, DE
• Heiko Specht · Hanau, DE
• Jens Troetzschel · Bruchköbel, DE
• Egbert Stiedl · Hanau, DE

Key dates

• Filing date: Apr 21, 2011
• Grant date: Jan 28, 2014
• Expiry date: Dec 27, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C1/045
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

One aspect relates to a method for producing an alloy characterized by grinding tantalum to form a tantalum powder and grinding tungsten to form a tungsten powder; mixing the tantalum powder and the tungsten powder to form a blended powder. The weight fraction of tungsten powder in the blended powder is larger than in the desired alloy. A blended body is produced from the blended powder by a powder metallurgical route. A pre-alloy is produced by a first melting of the blended body and at least a fraction of at least one further metal by a melt metallurgical route. The alloy is produced by a second melting of the pre-alloy and the remaining fraction of at least one metal by a melt metallurgical route.