Ceramic discharge vessel having molybdenum alloy feedthrough

Details Ceramic discharge vessel having molybdenum alloy feedthrough Ceramic discharge vessel having molybdenum alloy feedthrough

H - Electricity

01

J

H01J 61/30 (2006.01) C22C 27/04 (2006.01) H01J 61/36 (2006.01)

Patent

CA 2639667

A ceramic discharge vessel is described that is provided a feedthrough comprised of a molybdenum alloy containing at least 75 weight percent molybdenum and greater than weight percent of nickel and at least one other alloying metal selected from copper and iron, wherein the weight ratio of the amount of nickel to the combined amount of copper and iron, Ni:(Fe,Cu), in the alloy is in the range of 1:1 to 9:1. The thermal expansion coefficient of the alloy is sufficiently matched to that of the ceramic so that the feedthrough may be sealed to the discharge vessel without causing cracking. Preferably, the feedthrough is directly sealed to the ceramic discharge vessel without the use of an intermediate frit material.

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