NDLI: Crystal-structure-controlled tribological behavior ofcarbon-graphite seal materials in partial pressures of helium andhydrogen. I. Specimen characterization and fundamentalconsiderations

Content Provider	Springer Nature Link
Author	Gardos, M.N. Adams, P.M. Barrie, J.D. Hilton, M.R.
Copyright Year	1997
Abstract	Three commercially available carbon-graphite cryogenic materials(EC-5, M234 and P5N) that are used as seals in rocket turbopumpassemblies have been characterized as part of a larger study toelucidate their tribological characteristics in helium andhydrogen. This report (part I) documents the results ofstructural/chemical characterization that included XRD, Ramanspectroscopy, and AES/EELS. Outgasing studies were also performedusing TGA-FTIR. The data indicate that the EC-5 consists of wellgraphitized carbon with three-dimensional order and a nominalcrystallite size (L$_{c}$) of 50 nm. The materialalso contained turbostratic carbon with a d-spacing of0.340 nm and a crystallite size of 12 to 14 nm. The LiF-doped P5Ncontains a mixture of turbostratic carbons which show onlytwo-dimensional order, and has smaller crystallite sizes thanthose in EC-5. The M234 contains significant amounts of metallicsilver; the carbon is mostly amorphous with only a minorcrystalline (turbostratic?) component. EC-5 was found to beessentially outgasing-free, while heating of the turbostraticand/or amorphous materials yielded polar gases (e.g., CO andCO$_{2}$) and, in the case of the M234, low molecularweight hydrocarbons. The relationship between thecrystallographic structure of these carbons and theirtribological performance is explored in parts II and III.
Starting Page	175
Ending Page	184
Page Count	10
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	3
Issue Number	2
e-ISSN	15732711
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	1997-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Mechanics Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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