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Ni‐Doped MoS 2 Dry Film Lubricant Life
Author(s) -
Vellore Azhar,
Romero Garcia Sergio,
Walters Nicholas,
Johnson Duval A.,
Kennett Andrew,
Heverly Matthew,
Martini Ashlie
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202001109
Subject(s) - materials science , lubricant , microstructure , doping , delamination (geology) , coating , cracking , composite material , dry lubricant , metallurgy , optoelectronics , paleontology , biology , subduction , tectonics
The wear life of undoped and Ni‐doped MoS 2 is evaluated at application‐relevant pressure and speed conditions in air. It is found that the Ni‐doped coatings outperform the undoped coatings, particularly at lower pressure (faster speed) conditions. To understand this, the evolution of the coatings during run‐in is characterized in terms of wear track depth, material composition, and microstructure. It is found that wear depth exceeds the thickness of the coatings after hundreds of cycles, in sharp contrast to the wear life that is measured to be tens of thousands of cycles based on friction. This suggests that sliding is facilitated by MoS 2 continually worn from the sides of the wear track for most of the coating life. Further, microstructural analysis shows that the improved performance of Ni‐doped coatings is attributable to cracking and delamination during the run‐in stage, leading to more lubricious material available to facilitate sliding.