NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Reaction layer formation at the graphite/copper-chromium alloy interfaceSessile drop tests were used to obtain information about copper chromium alloys that suitably wet graphite. Characterization of graphite/copper-chromium alloy interfaces subjected to elevated temperatures were conducted using scanning electron micrography, energy dispersive spectroscopy, Auger electron spectroscopy, and X-ray diffraction analyses. These analyses indicate that during sessile drop tests conducted at 1130 C for one hour, copper alloys containing greater than 0.98 percent chromium form continuous reaction layers of approximately 10 micron thickness. The reaction layers adhere to the graphite surface. The copper wets the reaction layer to form a contact angle of 60 degrees or less. X-ray diffraction results indicate that the reaction layer is chromium carbide. The kinetics of reaction layer formation were modelled in terms of bulk diffusion mechanisms. Reaction layer thickness is controlled initially by the diffusion of Cr out of Cu alloy and later by the diffusion of C through chromium carbide.
Document ID
19930041108
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Devincent, Sandra M.
(NASA Lewis Research Center Cleveland, OH, United States)
Michal, Gary M.
(Case Western Reserve Univ. Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 24A
Issue: 1
ISSN: 0360-2133
Subject Category
Composite Materials
Accession Number
93A25105
Funding Number(s)
PROJECT: RTOP 505-63-40
CONTRACT_GRANT: NCC3-94
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available