Method for the production of an internally vitrified SiO2 crucible

US7178366B2 · kind B2 · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Fritz Schwertfeger · Griesheim, DE
• Jens Guenster · Clausthal-Zellerfeld, DE
• Sven Engler · Clausthal-Zellerfeld, DE
• Juergen Heinrich · Schwarzenbek, DE

Key dates

• Filing date: May 27, 2004
• Grant date: Feb 20, 2007
• Expiry date: Aug 19, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B20/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for producing an SiO2 shaped body which is at least partially vitrified, wherein an amorphous, porous SiO2 green body is sintered or vitrified by contactless heating by means of radiation, while avoiding contamination to the SiO2 shaped body with foreign atoms, wherein the radiation used is the beam of a laser at a subatmospheric pressure below 1000 mbar.