Thin film deposition behavior of lubricants as a function of temperature - Lubricant stability maps
Abstract
The relative rates of evaporation and oxidative or thermal decomposition in lubricants are investigated experimentally at elevated temperatures. Thin films of lubricant are exposed to air at high temperatures, and attention is given to the amount of solid deposit rendered and the amount of evaporated material. The effects of volatility, oxidative stability, and thermal stability are assessed with the help of stability maps for liquid lubricants. The concept of fluid-stability maps based on deposit formation as a function of temperature is shown to be effective. At 200-425 C lubricant deposit formation in the presence of air is a function of lubricant volatility, oxidation rate, the rate of thermal degradation, and the effect of the bearing surface. Some materials are listed that can mitigate the effects of oxidation on lubricant performance which can be used for a range of aerospace applications.
- Publication:
-
Lubrication Engineering
- Pub Date:
- July 1992
- Bibcode:
- 1992LubEn..48..599K
- Keywords:
-
- High Temperature Lubricants;
- Lubricating Oils;
- Temperature Effects;
- Thermal Stability;
- Thin Films;
- Additives;
- Lubricant Tests;
- Oxidation Resistance;
- Thermal Decomposition;
- Mechanical Engineering