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Title: Electrical insulator assembly with oxygen permeation barrier

Abstract

A high-voltage electrical insulator for electrically insulating a thermoelectric module in a spacecraft from a niobium-1% zirconium alloy wall of a heat exchanger filled with liquid lithium while providing good thermal conductivity between the heat exchanger and the thermoelectric module. The insulator has a single crystal alumina layer (SxAl[sub 2]O[sub 3], sapphire) with a niobium foil layer bonded thereto on the surface of the alumina crystal facing the heat exchanger wall, and a molybdenum layer bonded to the niobium layer 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. 3 figures.

Inventors:
;
Issue Date:
Research Org.:
Martin Marietta Corp
OSTI Identifier:
5060690
Patent Number(s):
5298084 A
Application Number:
PPN: US 7-989609
Assignee:
Dept. of Energy, Washington, DC (United States) OAK; EDB-94-075142
DOE Contract Number:  
AC03-86SF16006
Resource Type:
Patent
Resource Relation:
Patent File Date: 11 Dec 1992
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; ELECTRICAL INSULATORS; DESIGN; SPACECRAFT POWER SUPPLIES; THERMOELECTRIC GENERATORS; ALUMINIUM OXIDES; ELECTRICAL INSULATION; THERMAL CONDUCTIVITY; ALUMINIUM COMPOUNDS; CHALCOGENIDES; DIRECT ENERGY CONVERTERS; ELECTRICAL EQUIPMENT; ELECTRONIC EQUIPMENT; EQUIPMENT; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; POWER SUPPLIES; THERMODYNAMIC PROPERTIES; NESDPS Office of Nuclear Energy Space and Defense Power Systems; 300303* - Thermoelectric Generators- Materials, Components, & Auxiliaries; 300304 - Thermoelectric Generators- Applications

Citation Formats

Van Der Beck, R.R., and Bond, J.A. Electrical insulator assembly with oxygen permeation barrier. United States: N. p., 1994. Web.
Van Der Beck, R.R., & Bond, J.A. Electrical insulator assembly with oxygen permeation barrier. United States.
Van Der Beck, R.R., and Bond, J.A. Tue . "Electrical insulator assembly with oxygen permeation barrier". United States.
@article{osti_5060690,
title = {Electrical insulator assembly with oxygen permeation barrier},
author = {Van Der Beck, R.R. and Bond, J.A.},
abstractNote = {A high-voltage electrical insulator for electrically insulating a thermoelectric module in a spacecraft from a niobium-1% zirconium alloy wall of a heat exchanger filled with liquid lithium while providing good thermal conductivity between the heat exchanger and the thermoelectric module. The insulator has a single crystal alumina layer (SxAl[sub 2]O[sub 3], sapphire) with a niobium foil layer bonded thereto on the surface of the alumina crystal facing the heat exchanger wall, and a molybdenum layer bonded to the niobium layer 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. 3 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {3}
}