Coated metal element used for producing glass

US7338714B2 · 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 29, 2001
• Grant date: Mar 4, 2008
• Expiry date: Jul 6, 2022

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 for use in glass production has an uncoated region for contacting a glass melt and a side opposite from the uncoated region is provided with an H2-impervious layer or an H2-impervious and O2-impervious layer. The H2-impervious layer or H2-impervious and O2-impervious layer has a thickness greater than or equal to 1 mm, is heat-resistant, liquid, or solid. This layer is made from at least one partly or completely crystallized glass or a glass mixture or a ceramic material. Processes for coating the noble metal element are also described. The coated metal elements can be an electrode in a distributor, a channel or melting tank, a pipe for conducting and conditioning glass melts, a shaping tool for producing pipes and rods or a jacketed platinum tube for direct heating of bottom outlets, transport equipment or charging organs, an agitator, a pipe-drawing head, a feeder head, a plunger in gob feeders, drawing tanks and drawing lips for flat glass production and fining chambers.