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Preliminary study of niobium alloy contamination by transport through heliumPreliminary tests were conducted to determine if interstitial element transport through a circulating helium working fluid was a potential problem in Brayton and Stirling space power systems. Test specimens exposed to a thermal gradient for up to 3000-hr included Nb-1%Zr, a Sm-Co alloy (referred to as SmCo in this paper), Hiperco 50 steel, and alumina to simulate various engine components of the Brayton and Stirling systems. Results indicate that helium transport of interstitial contaminants can be minimized over a 7-yr life with a monometallic Nb-1%Zr design. Exposure with other materials indicated a potential for interstitial contaminant transport. Determination of contamination kinetics and the effects on structural integrity will require additional testing.
Document ID
19870008451
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Scheuermann, Coulson M. (NASA Lewis Research Center Cleveland, OH, United States)
Moore, Thomas J. (NASA Lewis Research Center Cleveland, OH, United States)
Wheeler, Donald R. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1987
Subject Category
Metallic Materials
Report/Patent Number
NAS 1.15:88952
DOE/NASA/16310-2
NASA-TM-88952
E-3401
Report Number: NAS 1.15:88952
Report Number: DOE/NASA/16310-2
Report Number: NASA-TM-88952
Report Number: E-3401
Accession Number
87N17884
Funding Number(s)
CONTRACT_GRANT: DE-AI03-86SF-16310
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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