Crucible for growing single crystals, process for making the same and use of the same

US5993545A · kind A · utility

Assignee

• W.C. Heraeus GmbH & Co. KG · DE

Inventors

• David Francis Lupton · Gelnhausen, DE
• Jorg Schielke · Bruchköbel, DE
• Manfred Weigelt · Gelnhausen, DE
• Klaus Petermann · Wedel, DE
• Eric Mix · Hamburg, DE
• Livio Fornasiero · Bliestorf, DE

Key dates

• Filing date: Jan 9, 1998
• Grant date: Nov 30, 1999
• Expiry date: Jan 9, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T117/108
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A sintered rhenium crucible, highly suitable for growing single crystals from refractory metal oxides, for example by the Czochralski technique, is formed of fine rhenium powder, by sintering. A compact is formed by cold isostatic pressing and thereafter the compact is sintered at 500-2800.degree. C. to obtain a sintered crucible. Product density is limited to 88-95% of theroretical in order to maximize creep resistance.