Cooking surface for cooking food having a glass ceramic surface with a glass coating thereon

US6525300B1 · kind B1 · utility

Assignee

• Schott Glas · DE

Inventors

• Ina Mitra · Stadecken-Elsheim, DE
• Friedrich Siebers · Nierstein, DE
• Jutta Reichert · Melton Mowbray, GB
• Cora Krause · Burrweiler, DE
• Otmar Becker · Langen, DE
• Michael Bug · Floh-Seligenthal, DE

Key dates

• Filing date: Aug 9, 2001
• Grant date: Feb 25, 2003
• Expiry date: Aug 9, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2217/72
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to lead- and cadmium-free glass for glazing, enamelling and decorating glasses or glass-ceramics which have a low coefficient of thermal expansion of less than 2×10−6/K, having the composition (in % by weight) 0-6 Li2O, 0-5 Na2O, 0 to less than 2 K2O, where the sum Li2O+K2+Na2O is between 2 and 12, 0-4 MgO, 0-4 CaO, 0-4 SrO, 0-1 BaO, 0-4 ZnO, 3 to less than 10 Al2O3, 13-23 B2O3, 50-65 SiO2, 0-4 TiO2, 0-4 ZrO2 and 0-4 F, as replacement for oxygen and containing up to 30% by weight of a pigment which is resistant at the firing temperature, where the glass is suitable for glazing, enamelling and decoration in both primary and secondary firing, and both the full-area and sparse glaze, enamel or decoration layers have low abrasion susceptibility after firing, and it relates to processes for the production of a glass-ceramic coated therewith.