NDLI: In Situ Analysis of Third Body Contributions to Sliding Friction of a Pb–Mo

Content Provider	Springer Nature Link
Author	Dvorak, S. D. Wahl, K. J. Singer, I. L.
Copyright Year	2007
Abstract	Reciprocating sliding tests of ion-beam deposited (IBD) Pb–Mo–S coatings were performed with an in situ tribometer that allows real-time visualization and Raman analysis of the sliding contact through a transparent hemisphere. Experiments were performed in dry air, ambient air (∼50% RH) and mixtures of dry and humid air cycled between low and high humidity. Third bodies formed in the sliding contact were monitored through an optical microscope and analyzed by Raman Spectroscopy. Third body velocity accommodation modes were identified and correlated with friction behavior in dry and ambient air. The dominant velocity accommodation mode in both dry and humid air was interfacial sliding between the outer surface of the transfer film and the wear track; this interface, based on present and earlier studies, is crystalline MoS$_{2}$. Therefore, the friction coefficient was controlled by the interfacial shear strength of MoS$_{2}$ sliding against MoS$_{2}$. Humid air sliding was accompanied by a rise in the friction coefficient and a small but observable second velocity accommodation mode: shear/extrusion of the transfer film. It is concluded that the friction rise in humid air was due to an increase in the interfacial shear strength, and that the rise in friction caused the third body to deform rather than the deformation causing the friction to rise.
Starting Page	263
Ending Page	274
Page Count	12
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	28
Issue Number	3
e-ISSN	15732711
Language	English
Publisher	Springer US
Publisher Date	2007-09-29
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	MoS$_{2}$ Solid lubrication In situ tribology Velocity accommodation Rheology Nanotechnology Physical Chemistry Theoretical and Applied Mechanics Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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