Lead-free bismuth-containing silicate glasses and uses thereof

US6403507B2 · kind B2 · utility

Assignee

• Schott Glas · DE

Inventors

• Karin Naumann · Ober-Olm, DE
• Magdalena Winkler-Trudewig · Mainz, DE
• Ute Woelfel · Bingen, DE
• Christian Kunert · Wiesbaden, DE

Key dates

• Filing date: Mar 28, 2001
• Grant date: Jun 11, 2002
• Expiry date: Mar 28, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C4/087
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The lead-free bismuth-containing silicate glasses, which are particularly suitable for use as funnel glass or neck glass for cathode ray tubes and as soldering glass, have the following respective compositions (in % by weight, based on oxide): SiO2 40-60; Bi2O3, 10-30; ZrO2, 0-3; Al2O3, 0.5-5; MgO, 0-6; CaO, 0.5-5; SrO, 1-15; BaO, 0-15; sum of the alkaline earth metal oxides, 2-20; ZnO, 0-2; Li2O, 0-10; Na2O, 1-10; K2O, 2-10; Cs2O, 0-3, sum of the alkali metal oxides, 5-20; CeO2, 0-8; WO3, 0.5-5; MoO3, 0-5 and Sb2O3, 0-0.6; and SiO2 30-50; Bi2O3, 20-40; ZrO2, 0-3; Al2O3, 0.5-5; MgO, 0-4; CaO, 0.5-4; SrO, 1-15; BaO, 0-15; sum of the alkaline earth metal oxides, 2-20; ZnO, 0-2; Li2O, 0-5; Na2O, 1-12; K2O, 2-15; Cs2O, 0-3, sum of the alkali metal oxides, 5-20; CeO2, 0-8; WO3, 0.5-5; MoO3, 0-5 and Sb2O3, 0-0.6.