Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Reexamination Certificate
2011-06-07
2011-06-07
Austin, Aaron (Department: 1784)
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
C428S665000, C065S492000
Reexamination Certificate
active
07955715
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).
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Weihong et al., “Diffusion layer at the interface of W/Re-composite nozzles,” High Temperatures-High Pressures, 1994, vol. 26, pp. 115-121.
espacenet English language abstract for JP 2022132, Jan. 25, 1990.
Becker Joerg
Berg Rainer
Leber Helmut
Trommer Martin
Whippey Nigel
Austin Aaron
Heraeus Quarzglas GmbH & Co. KG
Tiajoloff and Kelly LLP
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