Dark red transparent refractory glass

US4007048A · kind A · utility

Assignee

• Jenaer Glaswerk, Schott & Gen. · DE

Inventors

• Werner Sack · Mainz, DE
• Herwig Scheidler · Mainz, DE

Key dates

• Filing date: Jun 17, 1975
• Grant date: Feb 8, 1977
• Expiry date: Jun 17, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C10/0027
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

Glass ceramic and the process for producing a dark red glass ceramic comprising the production of basic glass by melting at about 1620.degree. C a mixture of approximate percentages of sand 53.30%, hydrated alumina 27.15%, zirconium silicate 1.90%, titanium oxide 2.02%, lithium carbonate 7.49%, sodium carbonate 0.87%, potash 0.62%, dolomite 0.39%, barium carbonate 1.04%, barium nitrate 2.16%, zinc oxide 1.09%, manganese dioxide 0.56%, ferric oxide 0.21%, cobalt oxide 0.36%, nickel oxide 0.05% and antimony oxide 0.73%. After cooling to about 1480.degree. C, the glass is formed into articles, and the articles further cooled to at least 700.degree. C. The articles are then heat treated to 800.degree. C at about .ltoreq.10.degree. C/min., devitrifying the glass from 800.degree. C to 900.degree. C, at, for example, 0.5.degree. C/min and cooling the article from 890.degree. C to room temperature at, for example, 7.degree. C/min.