| Titre : | Friction and wear mechanisms in MoS2/Sb2O3/Au nanocomposite coatings (2011) |
| Auteurs : | T.W. Scharf, Auteur ; P.G. Kotula, Auteur ; S.V. Prasad, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Acta materialia (Vol. 58 N° 12, Juillet 2010) |
| Article en page(s) : | pp. 4100–4109 |
| Note générale : | Métallurgie |
| Langues : | Anglais |
| Tags : | Coatings Thin films Nanocomposites Wear Friction |
| Résumé : | Fundamental phenomena governing the tribological mechanisms in sputter deposited amorphous MoS2/Sb2O3/Au nanocomposite coatings are reported. In dry environments the nanocomposite has the same low friction coefficient as pure MoS2 (∼0.007). However, unlike pure MoS2 coatings, which wear through in air (50% relative humidity), the composite coatings showed minimal wear, with wear factors of ∼1.2–1.4 × 10−7 mm3 Nm−1 in both dry nitrogen and air. The coatings exhibited non-Amontonian friction behavior, with the friction coefficient decreasing with increasing Hertzian contact stress. Cross-sectional transmission electron microscopy of wear surfaces revealed that frictional contact resulted in an amorphous to crystalline transformation in MoS2 with 2H-basal (0 0 0 2) planes aligned parallel to the direction of sliding. In air the wear surface and subsurface regions exhibited islands of Au. The mating transfer films were also comprised of (0 0 0 2)-oriented basal planes of MoS2, resulting in predominantly self-mated “basal on basal” interfacial sliding and, thus, low friction and wear. |
| DEWEY : | 669 |
| ISSN : | 1359-6454 |
| En ligne : | http://www.sciencedirect.com/science/article/pii/S1359645410001989 |
