Loading patent…
AssigneeSchott Glas
InventorsMarten Walther, Michael Spallek, Burkhardt Danielzik, Martin Heming, Johannes Segner
Estimating the term…
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 SiO2, Al2O3, TiO2 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.
A glass tube made from low melting glass material and acting as a semi-finished product or intermediate for making a hollow, interiorly coated glass body with an interior coating increasing a chemical resistance of said hollow, interiorly coated glass body, said glass body being formed by shaping or working, wherein said glass tube has an interior surface and a coating of oxide material on said interior surface, and said coating has a predetermined coating thickness, whereby required shaping or working conditions for making said glass body from said glass tube and chemical resistance requirements for said glass body are met.
A glass tube with an interior oxide coating, said glass tube with said interior oxide coating being made by a method comprising the steps of:
Dependencies are inferred from the claim text.