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Diffusion mechanisms in chemical vapor-deposited iridium coated on chemical vapor-deposited rheniumRadiation-cooled rocket thruster chambers have been developed which use CVD Re coated with CVD Ir on the interior surface that is exposed to hot combustion gases. The Ir serves as an oxidation barrier which protects the structural integrity-maintaining Re at elevated temperatures. The diffusion kinetics of CVD materials at elevated temperatures is presently studied with a view to the prediction and extension of these thrusters' performance limits. Line scans for Ir and Re were fit on the basis of a diffusion model, in order to extract relevant diffusion constants; the fastest diffusion process is grain-boundary diffusion, where Re diffuses down grain boundaries in the Ir overlayer.
Document ID
19920045393
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hamilton, J. C.
(NASA Lewis Research Center Cleveland, OH, United States)
Yang, N. Y. C.
(NASA Lewis Research Center Cleveland, OH, United States)
Clift, W. M.
(NASA Lewis Research Center Cleveland, OH, United States)
Boehme, D. R.
(NASA Lewis Research Center Cleveland, OH, United States)
Mccarty, K. F.
(Sandia National Laboratories Livermore, CA, United States)
Franklin, J. E.
(Aerojet, Propulsion Div., Sacramento CA, United States)
Date Acquired
August 15, 2013
Publication Date
March 1, 1992
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 23A
ISSN: 0360-2133
Subject Category
Metallic Materials
Accession Number
92A28017
Funding Number(s)
CONTRACT_GRANT: NAS3-25646
Distribution Limits
Public
Copyright
Other

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