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Excitation of a Closed Cylindrical Cavity by a Charged Ring Moving Along the Axis at Constant Velocity
None
Date:
February 10, 1969
Creator:
Levine, Barbara S. & Sessler, Andrew M.
Object Type:
Article
System:
The UNT Digital Library
High-temperature ceramic-to-metal seal development
A ceramic-to-metal seal was developed capable of operation up to 1200 deg C in a cesium environment. A new metallizing technique based on a promising tungsten--yttria system reported by LASL, was studied. Effects of mixture age, delay time between metallizing and brazing, and high-temperature outgassing were measured and found critical to the final joint strength. Seals were prepared by brazing metallized Lucalox to niobium with a 60 vanadium--40 niobium braze alloy. A complex braze thermal history was required for a high-strength joint. A seal coat was developed which inhibits corrosive interaction between the braze alloy and alumina at high temperatues. With careful control of metallizing and brazing techniques, room-temperature joint strengths equivalent to or better than early 700 deg C seals were obtained. Seals were subjected to thermal stability and cesium corrosion proof tests; they remained leak tight. (40 figures) (auth)
Date:
February 10, 1969
Creator:
Chin, J. & Messick, C.W.
Object Type:
Report
System:
The UNT Digital Library