Process for manufacture of a component made of opaque synthetic quartz glass

US6684664B2 · kind B2 · utility

Assignee

• HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

• Waltraud Werdecker · Hanau, DE
• Udo Gertig · Goldbach, DE
• Johann Leist · Schongau, DE
• Helmut Leber · Hanau, DE

Key dates

• Filing date: Apr 20, 2001
• Grant date: Feb 3, 2004
• Expiry date: Nov 11, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/1393
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for manufacture of a component made of opaque synthetic quartz glass, and a quartz glass tube manufactured according to said process. The process comprises (i) providing a starting material in the form of granulated material of highly pure, synthetic SiO2 comprising at least partially porous agglomerates of SiO2 primary particles, the granulated material having a compacted bulk density of no less than 0.8 g/cm3, (ii) filling the granulated material into a mold and converting it to an opaque quartz glass preform through a process of melting, and (iii) reshaping the preform in a heat reshaping process to obtain a component made of opaque quartz glass. A quartz glass tube is made of quartz glass consisting of a granulated material of synthetic SiO2 with a lithium content of no more than 100 wt-ppb, and the wall thickness of said component being in the range of 0.5 mm to 15 mm.