Method for producing opaque quartz glass, and blank made from the opaque quartz glass

US10807900B2 · kind B2 · utility

Assignee

• HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

• Christian Schenk · Ingelheim am Rhein, DE
• Gerrit Scheich · Seligenstadt, DE
• Nadine Tscholitsch · Hanau, DE

Key dates

• Filing date: Dec 20, 2017
• Grant date: Oct 20, 2020
• Expiry date: Apr 28, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2201/80
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In one method for producing opaque quartz glass, a green body is produced from a slip containing fine, amorphous SiO2 particles and coarse SiO2 reinforcement bodies and the green body is sintered by way of a sintering treatment into a blank made from the opaque quartz glass. The reinforcement bodies with a specific density DK1 are here embedded in a SiO2 matrix with a specific glass density DM. Starting from this, in order to provide a blank of opaque quartz glass that is less susceptible to cracking and illustrates homogeneous transmission even in the case of small wall thicknesses, in one aspect sinterable reinforcement bodies are used, the specific density DK0 of which prior to the sintering treatment is lower than the specific glass density DM, and which due to the sintering treatment reach the specific density DK1 which differs from the specific glass density DM by less than 10%.