Transparent β-quartz glass-ceramics with low lithium content

US11352290B2 · kind B2 · utility

Assignee

• Eurokera · FR

Inventors

• Marie Jacqueline Monique Comte · Fontenay-aux-Roses, FR
• Thiphaine Ogier · Paris, FR
• Philippe Lehuede · Dammarie-les-Lys, FR

Key dates

• Filing date: Jun 6, 2018
• Grant date: Jun 7, 2022
• Expiry date: Jun 6, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2204/00
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present application provides transparent glass-ceramics of β-quartz of composition containing a small content of lithium, articles constituted at least in part of said glass-ceramics, glasses precursors of said glass-ceramics, and also a method of preparing said articles. Said glass-ceramics have a composition, free of arsenic oxide and antimony oxide, except for inevitable traces, expressed as percentages by weight of oxides, containing: 62% to 68% of SiO2; 17% to 21% of AI2O3; 1% to <2% of Li2O; 1% to 4% of MgO; 1% to 6% of ZnO; 0 to 4% of BaO; 0 to 4% of SrO; 0 to 1% of CaO; 1% to 5% of TiO2; 0 to 2% of ZrO2; 0 to 1% of Na2O; 0 to 1% of K2O; with Na2O+K2O+BaO+SrO+CaO<6%; optionally up to 2% of at least one fining agent comprising SnO2; and optionally up to 2% of at least one coloring agent.