Coated noble metal elements for glass production

US8337946B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Franz Ott · Mitterteich, DE
• Dirk Gohlke · Mainz, DE
• Joerg Witte · Darmstadt, DE

Key dates

• Filing date: Nov 12, 2008
• Grant date: Dec 25, 2012
• Expiry date: Mar 30, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P40/50
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The regionally coated noble metal element used in glass production has an uncoated region for contacting a glass melt and an H2-impervious layer or an H2-impervious and O2-impervious layer on a side opposite from the uncoated region, which has a layer thickness ≧1 mm, is heat-resistant, and is either liquid or solid. This layer is made from at least one glass or glass mixture, an at least partly crystallized glass or a ceramic material. The coated noble metal element can be a Danner channel, a Vello draw head, an A-draw head, a Vello needle, a drawdown needle, a discharge ring or a Danner blowpipe. A process for coating a noble metal element to produce the regionally coated noble metal element is also described.