Fundamentals of High Temperature Lubrication
Abstract
A program of research has been conducted into the fundamentals of vapor phase lubrication for use in high temperature applications. The focus of the effort has been on the reaction mechanisms by which phosphates and phosphites decompose on metal surfaces to form thin lubricating films of polyphosphate glass. The results have explained the origins of the superior performance of aryl phosphates over alkylphosphates as vapor phase lubricants. In addition experiments have been conducted to probe the fundamentals of friction between single crystalline surfaces. These have revealed that friction anisotropy between crystalline metal surfaces is due to anisotropy in the work of bulk plastic deformation that occurs during sliding. They have also revealed effects of adsorbate layering at metal surfaces during sliding. Finally, study of the frictional properties of quasicrystals has revealed the role of surface oxides films in lowering the friction between quasicrystalline surfaces.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 31, 2001
- Accession Number
- ADA389303
Entities
People
- Andrew J. Gellman
Organizations
- Carnegie Mellon University