Method of making a hollow, interiorly coated glass body and a glass tube as a semi-finished product for forming the glass body

US6200658A · kind A · utility

Assignee

• Schott Glas · DE

Inventors

• Marten Walther · Engelstadt, DE
• Michael Spallek · Ingelheim am Rhein, DE
• Burkhardt Danielzik · Ingelheim am Rhein, DE
• Martin Heming · Saulheim, DE
• Johannes Segner · Stromberg, DE

Key dates

• Filing date: Jan 19, 1999
• Grant date: Mar 13, 2001
• Expiry date: Jan 19, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/1317
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Numerous applications for hollow glass bodies made from low melting glass material require an increase in the chemical resistance of the interior surface of the glass body. In order to avoid a disadvantageous de-alkalizing process the hollow glass body must be provided with an interior coating in a comparatively expensive prior art process. In an improved process according to the invention a glass tube acting as a semifinished product from which the hollow glass body is made is provided with an interior coating of oxide material, preferably SiO.sub.2, Al.sub.2 O.sub.3, TiO.sub.2 or mixtures thereof, having a predetermined coating thickness according to the required chemical resistance or working conditions for forming the glass body and then the hollow glass body is made from the glass tube. The coating is advantageously provided by means of a PICVD process.