Low-contamination AlN crucible for monocrystal pulling and method

US4519966A · kind A · utility

Assignee

• W. C. Heraeus GmbH · DE

Inventors

• Fritz Aldinger · Rodenbach, DE
• Richard Keilberth · Kleinheubach, DE
• Waltraud Werdecker · Hanau, DE

Key dates

• Filing date: Dec 20, 1983
• Grant date: May 28, 1985
• Expiry date: Dec 20, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T117/1032
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A low contamination crucible for pulling monocrystals of Group III and Group V elements of the Periodic Table, comprising particularly aluminum nitride with an additive of boron nitride or a rare earth oxide. The additive concentration is up to 5% by weight, but preferably 0.5% to 3% by weight. The hardness of the crucible of the invention is 300 to 400% greater than that of undoped material subjected to the same sintering conditions.