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:
Jun. 07, 2011
Filed:
Dec. 20, 2006
Martin Trommer, Schluechtern, DE;
Rainer Berg, Langenselbold, DE;
Nigel Whippey, Seligenstadt, DE;
Helmut Leber, Hanau, DE;
Joerg Becker, Niddatal, DE;
Martin Trommer, Schluechtern, DE;
Rainer Berg, Langenselbold, DE;
Nigel Whippey, Seligenstadt, DE;
Helmut Leber, Hanau, DE;
Joerg Becker, Niddatal, DE;
Heraeus Quarzglas GmbH & Co. KG, Hanau, DE;
Abstract
In a known method for coating a crucible for use at a high working temperature in a crucible drawing method for quartz glass, a base body wall of tungsten has applied thereto a protective layer containing a coating metal consisting of the group selected from iridium, rhenium, osmium and ruthenium. Starting therefrom, to provide a method for producing such a component exhibiting high corrosion resistance to the quartz glass melt at low material costs, it is suggested according to the invention that the protective layer should be produced from a layer material which contains tungsten and the coating metal, and in which the amount of the coating metal should be dimensioned such that it exceeds the limit amount of a coating metal-rich phase boundary of a solid mixture phase of tungsten and the coating metal, with the solid mixture phase being thermodynamically stable at the working temperature, by not more than 25 at. % (based on the total amount of tungsten and the coating metal in the layer material).