The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 08, 2008
Filed:
Jul. 02, 2003
Michel Paul Barbara Van Bruggen, Eindhoven, NL;
Rolf Theo Anton Apetz, Aachen, DE;
Theo Arnold Kop, Eindhoven, NL;
Andreas Krell, EindhovenDresden, DE;
Thomas Hutzler, Dresden, DE;
Michel Paul Barbara Van Bruggen, Eindhoven, NL;
Rolf Theo Anton Apetz, Aachen, DE;
Theo Arnold Kop, Eindhoven, NL;
Andreas Krell, EindhovenDresden, DE;
Thomas Hutzler, Dresden, DE;
Koninklijke Philips Electronics, N.V., Eindhoven, NL;
Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung e.V., Munich, DE;
Abstract
The present invention relates to highly dense translucent and transparent aluminium oxide components for applications, e.g. in the lighting industry, where a fine crystal size has to be obtained and stabilized for use at temperatures of 800° C. or more. Disclosed are high-strength polycrystalline alumina products which include 0.001-0.5 weight-% ZrOstabilizing a fine crystal size <2 μm or, preferably, <1 μm if used at temperatures of 800° C. or more. The microstructure exhibits an extremely high relative density enabling a high real in-line transmission >30% measured over an angular aperture of at most 0.5° at a sample thickness of 0.8 mm and with a monochromatic wavelength of light λ, preferably, of 645 nm.