|
|
 |
|
|
|
|
TITLE AND SUBTITLE:
Preliminary Evaluation of Greases for Space Mechanisms Using a Vacuum Spiral Orbit Tribometer
AUTHOR(S):
Marchetti, Mario; Jones, William, R., Jr.; Street, Kenneth, W.; Pepper, Stephen, V.; Jansen, Mark, J.
REPORT DATE:
2001-09-01
FUNDING NUMBERS:
WU-274-00-00-00
PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration John H. Glenn Research Center at Lewis Field Cleveland, Ohio 44135-3191
PERFORMING ORGANIZATION REPORT NUMBER:
E-13013
SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration Washington, DC 20546-0001
REPORT TYPE AND DATES COVERED:
Technical Memorandum
SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA/TM-2001-211157
SUPPLEMENTARY NOTES:
Prepared for the 68th Annual Meeting sponsored by the National Lubricating Grease Institute, West Palm Beach, Florida, October 28-31, 2001. Mario Marchetti, William R. Jones, Jr., Kenneth W. Street, and Stephen V. Pepper, NASA Glenn Research Center; and Mark J. Jansen, Sest, Inc., 18000 Jefferson Park, Middleburg Heights, Ohio 44130. Responsible person, Mario Marchetti, organization code 5960, 216-433-5843.
ABSTRACT:
Most currently used greases for space applications are based on perfluoropolyalkylethers (PFPE) and multiply alkylated cyclopentane (MAC) oils. Evaluation of the greases includes outgassing properties, rheological behavior, and particularly the ability to create EHL films under conditions as close as possible to an actual application. A spiral orbit tribometer (SOT) has been developed to conduct accelerated tests under realistic conditions. The SOT was employed to evaluate two greases used in space mechanisms: a PFPE oil with polytetrafluoroethylene (PTFE) thickener, and a multiply alkylated cyclopentane oil with n-octadecylterephthalamate soap. The results from the greases are in agreement with results previously obtained with the base oils.
SUBJECT TERMS:
Grease; Space mechanisms; Lubrication
NUMBER OF PAGES:
13
PDF AVAILABLE FROM URL:
2001/TM-2001-211157.pdf ( 663 KB )
|
|
|
|