Friction and wear mechanisms in MoS2/Sb2O3/Au nanocomposite coatings / T.W. Scharf in Acta materialia, Vol. 58 N° 12 (Juillet 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4100–4109 Titre : Friction and wear mechanisms in MoS2/Sb2O3/Au nanocomposite coatings Type de document : texte imprimé Auteurs : T.W. Scharf, Auteur ; P.G. Kotula, Auteur ; S.V. Prasad, Auteur Année de publication : 2011 Article en page(s) : pp. 4100–4109 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : 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 [article] Friction and wear mechanisms in MoS2/Sb2O3/Au nanocomposite coatings [texte imprimé] / T.W. Scharf, Auteur ; P.G. Kotula, Auteur ; S.V. Prasad, Auteur . - 2011 . - pp. 4100–4109. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4100–4109 Mots-clés : 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

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