Method of producing lightweight structural elements

US9550696B2 · kind B2 · utility

Assignee

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

Inventors

• Gerhard Kalkowski · Jena, DE
• Stefan Risse · Jena, DE
• Ramona Eberhardt · Jena, DE

Key dates

• Filing date: Feb 9, 2012
• Grant date: Jan 24, 2017
• Expiry date: Jun 27, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2237/62
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a method of producing lightweight structural elements which are produced as a composition construction element having at least one cover plate and one carrier element which are connected to one another. A carrier element, at which at least one apertures and/or at least one cut-out is/are formed and at least one further element, which is a cover plate, are connected to one another. A carrier element and at least one cover plate can be formed from a glass, a glass ceramic material, a ceramic material and/or silicon having an oxide surface layer which is formed at least in the bonding region of the elements to be connected to one another. The carrier element should have at least a double thickness with respect to the thickness of a cover plate. The surfaces of the cover plate(s) and of the carrier element to be connected to one another should be intensely cleaned in their bonding regions and should be smoothed such that a roughness of the surface is achieved there, such that they are in direct touching contact with at least 80% of their bonding surface with an active compression source and in this respect a thermal treatment is carried out at a temperature of …