Patent · US Active

Method for producing a pore-containing opaque quartz glass

US10358373B2 · kind B2 · utility

0Cited by

3References

16Claims

0Family size

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	May 23, 2017
Grant date	Jul 23, 2019
Priority date	—
Expiry date	Jul 19, 2037

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03B2201/02
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A method for producing a pore-containing opaque quartz glass includes: (a) producing porous SiO2 granulate particles from synthetically produced SiO2, (b) thermally densifying the SiO2 granulate particles to form partly densified SiO2 granulate particles, (c) forming a dispersion from the partly densified SiO2 granulate particles, (d) comminuting the partly densified SiO2 granulate particles to form a slip containing comminuted SiO2 granulate particles, (e) shaping the slip into a shaped body and forming a porous SiO2 green body with a green density rG, and (f) sintering the SiO2 green body into opaque quartz glass. To produce opaque quartz glass that is also suited for the use of spray granulate, during step (b), partly densified SiO2 granulate particles are produced with a specific surface BET-(A) between 0.025 and 2.5 m2/g, and during step (d), comminuted SiO2 granulate particles are produced with a specific surface BET-(B) between 4 and 10 m2/g.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.