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A program in refractory metal thermocouple research.Description of a refractory metal thermocouple research program, directed towards establishing the parameters that are necessary to achieve reliable, long term, high temperature thermocouple performance. A description of special apparatus for exposing bare-wire thermoelements to high temperatures in vacuum and in high purity gaseous environments is given, and the design and performance of an ultra-high-vacuum, high-temperature furnace system are described. Bare-wire W-3 per cent Re and W-25 per cent Re thermoelements were exposed at 2400 K in argon, hydrogen, or vacuum, and experienced a shift in their emf-temperature relationship upon initial exposure. After the initial shift, the thermoelements exposed in the gaseous environments experienced no significant further change in their emf-temperature relationship for periods up to 1000 hrs. The thermoelements exposed in vacuum continually drifted in their emf-temperature relationship as a result of the preferential loss of Re by evaporation.
Document ID
19720031884
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Burns, G. W.
Hurst, W. S.
(National Bureau of Standards Washington, D.C., United States)
Date Acquired
August 6, 2013
Publication Date
June 1, 1971
Publication Information
Publication: Journal of Research
Subject Category
Instrumentation And Photography
Accession Number
72A15550
Funding Number(s)
CONTRACT_GRANT: NASA ORDER C-61545-B
CONTRACT_GRANT: NASA ORDER C-30968-B
Distribution Limits
Public
Copyright
Other

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