Alkali-free aluminoborosilicate glasses, and uses thereof

US7157392B2 · kind B2 · utility

Assignee

• Schott Glas · DE

Inventors

• Ulrich Peuchert · Bodenheim, DE
• Peter Brix · Mainz, DE

Key dates

• Filing date: May 10, 2004
• Grant date: Jan 2, 2007
• Expiry date: Sep 2, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C3/091
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An alkali-free aluminoborosilicate glass having a coefficient of thermal expansion α20/300 of between 2.8×10−6/K and 3.8×10−6/K, which has the following composition (in % by weight, based on oxide): silicon dioxide (SiO2)>58–65, boric oxide (B2O3)>6–11.5, magnesium oxide (MgO) 4–8, barium oxide (BaO) 0–<0.5, zinc oxide (ZnO) 0–2 and aluminum oxide (Al2O3)>14–25, calcium oxide (CaO) 0–8, strontium oxide (SrO) 2.6–<4, with barium oxide (BaO)+strontium oxide (SrO)>3, or aluminum oxide (Al2O3)>14–25, calcium oxide (CaO) 0–<2, strontium oxide (SrO)>0.5–<4, or aluminum oxide (Al2O3)>21–25, calcium oxide (CaO) 0–8, strontium oxide (SrO)>2.6–<8, with barium oxide (BaO)+strontium oxide (SrO)>3, and which is highly suitable for use as a substrate glass both in display technology and in thin-film photovoltaics.