The Effects of Chemistry and Crystal Structure on the Lubrication Properties of Sputtered MoS2 Films
Abstract
Lubricating films of MoS2 have been prepared by sputter deposition onto steel substrates maintained at different temperatures. The surface chemical compositions and bulk structural properties of the films, before and after rubbing for various times in dry nitrogen gas, were determined by x-ray photoelectron spectroscopy and by x-ray diffraction, respectively. Film thicknesses, densities, and morphologies were also measured. Differences in these properties for the films prepared under different conditions provide insight into the mechanisms of film lubrication and failure. It is proposed that lubrication by MoS2 films occurs through intercrystalline slip and that there is an optimal crystalline size that provides maximum wear life under particular application conditions. Methods are suggested for improving film performance, based on particle/crystalline size and lattice spacing arguments and on the electronic properties of MoS2 and related compounds. Keywords: Solid lubricant, Molybdenum sulfate, Crystal structure.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 25, 1988
- Accession Number
- ADA197460
Entities
People
- Paul D. Fleischauer
- Reinhold Bauer
Organizations
- The Aerospace Corporation