Method for producing a component of rare earth metal-doped quartz glass

US10851008B2 · kind B2 · utility

Assignee

• HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

• Walter Lehmann · Leipzig, DE
• Mario Such · Gräfenhainichen, DE
• Thomas Kayser · Leipzig, DE
• Andreas Langner · Alzenau, DE
• Gerhard Schötz · Hanau, DE

Key dates

• Filing date: Mar 28, 2018
• Grant date: Dec 1, 2020
• Expiry date: Jan 28, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B2215/66
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method for producing a component with portions of a rare earth metal-doped quartz glass, an intermediate product containing voids and consisting of a SiO2 raw material doped with rare earth metal is introduced into a sinter mold the interior of which is bordered by a carbonaceous mold wall, and is melted therein into the component by gas pressure sintering at a maximum temperature above 1500° C. A shield is arranged between the mold wall and the intermediate product. In order to indicate a modified gas pressure sintering method that ensures the production of rare earth metal-doped quartz glass with reproducible properties, a bulk material of amorphous SiO2 particles with a layer thickness of at least 2 mm is used as the shield, the softening temperature thereof being at least 20° C. higher than the softening temperature of the doped SiO2 raw material, and the bulk material being gas-permeable at the beginning of the melting of the intermediate product, and the bulk material sintering during melting into an outer layer that is gas-tight to a pressure gas.