Inorganic fullerene-like material as additives to lubricants: structure–function relationship
✍ Scribed by L Rapoport; Y Feldman; M Homyonfer; H Cohen; J Sloan; J.L Hutchison; R Tenne
- Book ID
- 104266294
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 441 KB
- Volume
- 225-229
- Category
- Article
- ISSN
- 0043-1648
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✦ Synopsis
Ž .
Ž . Recently, inorganic fullerene-like IF supramolecules of metal dichalcogenide MX M s Mo, W, etc.; X s S, Se , materials with 2 Ž . structures closely related to nested carbon fullerenes and nanotubes have been synthesized. The main goal of the present work was to study the tribological properties of IF-WS in comparison to 2H-WS and MoS platelets over a wide range of loads and sliding 2 2 2 Ž . velocities. The size and shape distributions of the nanoparticles were studied by transmission electron microscopy TEM . The average size of the IF-WS particles was 120 nm, while that of 2H-WS and 2H-MoS was 0.5 mm and 4 mm. The chemical reactivity of the 2 2 2 different powders in an oxygenated atmosphere was verified by heating the powders in ambient atmosphere. The friction experiments Ž . were performed in laboratory atmosphere humidity ; 50% using a ring-block tester. Complementary information on the state of wear of the powders in the lubricating fluid and on the metal surfaces of the specimens was obtained using a combination of TEM, scanning Ž . Ž . electron microscopy SEM and X-ray photoelectron spectroscopy XPS . It has been established that IF-WS nanoparticles appear to 2 have excellent tribological properties in definite loading range in comparison to typical metal dichalcogenides. The oxidation of the IF Ž . particles and the wear track was essentially less than with solid lubricants made of platelets of the same chemical compound WS . The 2 main advantages of IF nanoparticles lie in their round shape and the absence of dangling bonds.