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Methods of measuring vapor pressures of lubricants with their additives using tga and/or microbalances
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Miller, Michael K. Montoya, Alex F. Scialdone, John J. |
| Copyright Year | 1996 |
| Description | The life of a space system may be critically dependent on the lubrication of some of its moving parts. The vapor pressure, the quantity of the available lubricant, the temperature and the exhaust venting conductance passage are important considerations in the selection and application of a lubricant. In addition, the oil additives employed to provide certain properties of low friction, surface tension, antioxidant and load bearing characteristics, are also very important and need to be known with regard to their amounts and vapor pressures. This paper reports on the measurements and analyses carried out to obtain those parameters for two often employed lubricants, the Apiezon(TM)-C and the Krytox(TM) AB. The measurements were made employing an electronic microbalance and a thermogravimetric analyzer (TGA) modified to operate in a vacuum. The results have been compared to other data on these oils when available. The identification of the mass fractions of the additives in the oil and their vapor pressures as a function of the temperature were carried out. These may be used to estimate the lubricant life given its quantity and the system vent exhaust conductance. It was found that the Apiezon(TM)-C has three main components with different rates of evaporation while the Krytox(TM) did not indicate any measurable additive. |
| File Size | 759519 |
| Page Count | 17 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19960022382 |
| Archival Resource Key | ark:/13960/t9h46nw1k |
| Language | English |
| Publisher Date | 1996-05-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Temperature Dependence Electronic Equipment Additives Oils Vapor Pressure Lubricants Microbalances Weight Reduction Thermogravimetry Spacecraft Lubrication Pressure Measurement Quartz Crystals Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
