Mathematics – Logic
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.480...57j&link_type=abstract
In: Proceedings of the 9th European Space Mechanisms and Tribology Symposium, 19-21 September 2001, Liège, Belgium. Compiled by
Mathematics
Logic
Tribology
Scientific paper
Silahydrocarbons are members of a relatively new class of liquid lubricants with great potential for use in space mechanisms. They are unimolecular species consisting of silicon, carbon and hydrogen. They possess unique wear, viscosity and volatility properties while retaining the ability to solubilize conventional additives. The tribological properties of several members of this class, including tri-, tetra- and penta-compounds, are presented. These properties include: viscosity-temperature, viscosity-pressure, vapor pressure, lubricant lifetimes, traction, reciprocating and four ball wear rates. Lubricant lifetimes were determined using a vacuum ball bearing simulator, the spiral orbit tribometer (SOT). Wear was measured using a Cameron Plint reciprocating tribometer and wear rates with a vacuum four ball tribometer. Conventional viscometry was used for viscosity-temperature measurements and a Knudsen cell for vapor pressure. Thermogravimetric Analysis (TGA) was also used for volatility measurements. Pressure viscosity coefficients (α values) were estimated from EHL film thickness measurements. These properties are compared to existing state-of-the-art space lubricants.
Dube Michael J.
Gschwender L. J.
Jansen Jeroen M.
Jones William R. Jr.
Predmore R. E.
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