Journal
TRIBOLOGY LETTERS
Volume 70, Issue 4, Pages -Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11249-022-01642-y
Keywords
MoS2; Density; XRD; RBS; TEM; Hardness; Nanoindentation
Categories
Funding
- National Science Foundation [DMR-1644779, 2027029, 1826251]
- NSF GRFP [1842163]
- State of Florida
- Center for Surface Engineering and Lubrication Research
- Center for Integrated Nanotechnologies, a Department of Energy office of Basic Energy Sciences user facility
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA0003525]
- Laboratory Directed Research and Development (LDRD) program at Sandia National Laboratories
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1826251, 2027029] Funding Source: National Science Foundation
- Division Of Graduate Education
- Direct For Education and Human Resources [1842163] Funding Source: National Science Foundation
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This study investigates the relationship between density, hardness, friction, and wear for pure molybdenum disulfide coatings. The results show that dense films have a wear rate 100 times lower than porous coatings, and high density pure MoS2 coatings demonstrate better tribological performance than composite coatings.
Pure molybdenum disulfide (MoS2) solid lubricant coatings could attain densities comparable to doped films (and the associated benefits to wear rate and environmental stability) through manipulation of the microstructure via deposition parameters. Unfortunately, pure films can exhibit highly variable microstructures and mechanical properties due to processes that are not controlled during deposition (i.e., batch-to-batch variation). This work focuses on developing a relationship between density, hardness, friction, and wear for pure sputtered MoS2 coatings. Results show that dense films (rho = 4.5 g/cm(3)) exhibit a 100 x lower wear rate compared to porous coatings (rho = 3.04-3.55 g/cm(3)). The tribological performance of high density pure MoS2 coatings is shown to surpass that of established composite coatings, achieving a wear rate 2 x (k = 5.74 x 10(-8) mm(3)/Nm) lower than composite MoS2/Sb2O3/Au in inert environments.
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