Sintered glass ceramic and method for producing the same

US8039407B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Karine Seneschal-Merz · Mainz, DE
• Bernd Hoppe · Ingelheim am Rhein, DE
• Dirk Sprenger · Stadecken-Elsheim, DE
• Martin Letz · Mainz, DE
• Thilo Zachau · Bürstadt, DE
• Friedrich Siebers · Nierstein, DE

Key dates

• Filing date: Nov 18, 2010
• Grant date: Oct 18, 2011
• Expiry date: Nov 18, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/764
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention provides a method for producing a glass ceramic comprising the steps of melting a starting glass that is free from alkali, except for incidental contamination, and that contains at least one garnet-forming agent and at least one oxide of a lanthanoid; grinding the starting glass to produce a glass frit; molding by pressing and sintering the glass frit until at least one garnet phase containing lanthanoids is formed. A glass ceramic produced in this way may contain 5-50% by weight of SiO2, 5-50% by weight of Al2O3 and 10-80% by weight of at least one oxide selected from the group formed by Y2O3, Lu2O3, Sc2O3, Gd2O3, Yb2O3, Ce2O3, as well as 0.1-30% by weight of at least one oxide selected from the group formed by B2O3, Th2O3, and oxides of the lanthanoids, except Lu2O3, Gd2O3, Yb2O3, Ce2O3. Such a glass ceramic is suited especially for down conversion of excitation radiation in the blue and in the UV region of the spectrum.