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Annealing Increases Stability Of Iridium ThermocouplesMetallurgical studies carried out on samples of iridium versus iridium/40-percent rhodium thermocouples in condition received from manufacturer. Metallurgical studies included x-ray, macroscopic, resistance, and metallographic studies. Revealed large amount of internal stress caused by cold-working during manufacturing, and large number of segregations and inhomogeneities. Samples annealed in furnace at temperatures from 1,000 to 2,000 degree C for intervals up to 1 h to study effects of heat treatment. Wire annealed by this procedure found to be ductile.
Document ID
19890000208
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Germain, Edward F.
(NASA Langley Research Center, Hampton, VA.)
Daryabeigi, Kamran
(NASA Langley Research Center, Hampton, VA.)
Alderfer, David W.
(NASA Langley Research Center, Hampton, VA.)
Wright, Robert E.
(NASA Langley Research Center, Hampton, VA.)
Ahmed, Shaffiq
(Youngstown State Univ.)
Date Acquired
August 14, 2013
Publication Date
April 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 4
ISSN: 0145-319X
Subject Category
Fabrication Technology
Report/Patent Number
LAR-13951
Accession Number
89B10208
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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