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- Title
Probing the First Few Layers of MoS<sub>2</sub> with HS-LEIS: Effect of Microstructure on Oxidation.
- Authors
Curry, John F.; Luftman, Henry S.; Sidebottom, Mark A.; Strandwitz, Nicholas C.; Argibay, Nicolas; Krick, Brandon A.
- Abstract
The extent of oxygen diffusion and oxide formation in amorphous (sputtered) and highly oriented (N2 sprayed) coatings were investigated using high-sensitivity, low energy ion scattering (HS-LEIS) spectrometry and tribological experiments. MoS2 solid lubricants are widely used in aerospace applications to provide ultra-low friction in dry and inert environments. Exposure to either molecular oxygen when stored in terrestrial environments or highly reactive atomic oxygen while in low earth orbit can cause oxides to form on the surface and disrupt the typically ultra-low friction sliding interface. Both types of coatings were subjected to a thermal atomic oxygen source and O2 gas at elevated temperatures to assess effects of oxidation on different types of microstructure (amorphous and highly oriented) for MoS2coatings. It was found that spray deposited coatings which exhibit this preferential basally oriented structure can better resist diffusion of oxygen within the first tens of nm. Subsequent friction testing also revealed differences in initial friction coefficient between coating types. Utilizing HS-LEIS as a tool to investigate the extent of interaction with environmental contaminants has proven to be a successful method.
- Subjects
OXIDATION; MICROSTRUCTURE; MOLYBDENUM disulfide; REACTIVE oxygen species; DIFFUSION; ION scattering spectrometry; POLLUTANTS
- Publication
Tribology & Lubrication Technology, 2017, Vol 73, Issue 5, p42
- ISSN
1545-858X
- Publication type
Article