Method for the siliceous bonding of coated and uncoated optical bodies

US9233873B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Gerhard Kalkowski · Jena, DE
• Simone Fabian · Jena, DE
• Charlotte Jahnke · Schnaittenbach, DE
• Ramona Eberhardt · Jena, DE
• Mark Schuermann · Aachen, DE

Key dates

• Filing date: May 9, 2011
• Grant date: Jan 12, 2016
• Expiry date: Jun 24, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09J2400/166
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention pertains to a process for the silicate bonding of joined surfaces, facing one another, of two components by means of an aqueous, alkaline, silicon-cation-containing joining solution for the purpose of producing an optical element, characterized in that one or both of said joined surfaces (1; 2b; 10) are covered with a layer of an oxide (3), which has a higher refractive index than SiO2 and is selected from among oxides of the third and fourth main group elements, of the second and third group of the transition elements as well as zirconium and from among mixed oxides of the said elements, whereupon the joining solution is applied to at least one of the surfaces to be joined and the surfaces are bonded to one another. The present invention also teaches the use of oxide layer (3) as a topmost layer of a component to be joined by means of an alkaline, silicate-containing solution for preventing or reducing opacifications and/or defects as a result of a chemical attack on the layer lying under it by the said alkaline solution.