Electrical insulator assembly with oxygen permeation barrier

Batteries: thermoelectric and photoelectric – Thermoelectric – Having housing – mounting or support

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136234, 136242, H01L 3502

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active

052980847

ABSTRACT:
A high-voltage electrical insulator (21) for electrically insulating a thermoelectric module (17) in a spacecraft from a niobium-1% zirconium alloy wall (11) of a heat exchanger (13) filled with liquid lithium (16) while providing good thermal conductivity between the heat exchanger and the thermoelectric module. The insulator (21) has a single crystal alumina layer (SxAl.sub.2 O.sub.3, sapphire) with a niobium foil layer (32) bonded thereto on the surface of the alumina crystal (26) facing the heat exchanger wall (11), and a molybdenum layer (31) bonded to the niobium layer (32) to act as an oxygen permeation barrier to preclude the oxygen depleting effects of the lithium from causing undesirable niobium-aluminum intermetallic layers near the alumina-niobium interface.

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J. D. Selle and J. H. DeVan, "The Reduction of Al.sub.2 O.sub.3 in Niobium-Lithium Systems at 1000.degree. C." Oak Ridge National Laboratory report ORNL/TM-5828; Chem. Abst. 88:139, 927t (1977), published Jul. 1977, pp. 1-17.

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