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US 7,453,212 B2Granted
Ceramic discharge vessel having tungsten alloy feedthrough
AssigneeOsram Sylvania Inc.
InventorJohn H. Selverian
Life of this patent
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Abstract
A tungsten alloy feedthrough for ceramic discharge vessels is used to form a hermetic seal with the ceramic body of the discharge vessel. The tungsten alloy comprises tungsten alloyed with a metal selected from titanium, vanadium or a combination thereof. The alloy may be formulated to have a coefficient of thermal expansion that closely matches that of the ceramic to prevent cracking. Preferably, the tungsten alloy contains from about 10 to about 35 wt. % of a metal selected from Ti, V, or a combination thereof.
Claims13
A ceramic discharge vessel comprising:
- a ceramic body having at least one electrode assembly, the electrode assembly having a feedthrough portion sealed to the ceramic body, the feedthrough being comprised of a tungsten alloy wherein tungsten is alloyed with a metal selected from titanium, vanadium or a combination thereof and wherein the tungsten alloy contains from about 10 to about 35 wt. % of titanium, vanadium or a combination thereof.
Dependencies are inferred from the claim text.