NDLI: Tribochemistry of MoS$_{3}$ Nanoparticle Coatings

Content Provider	Springer Nature Link
Author	Lince, Jeffrey R. Pluntze, Amanda M. Jackson, Sandra A. Radhakrishnan, Gouri Adams, Paul M.
Copyright Year	2014
Abstract	The tribology of nanoparticles based on transition metal dichalcogenides has been studied extensively. However, evaluation of metal chalcogenides with other stoichiometries has been lacking. We have studied the friction, endurance, and tribochemistry of bonded molybdenum trisulfide (MoS$_{3}$) nanoparticle-based coatings for the first time. A facile aqueous chemistry method was used to fabricate the MoS$_{3}$ nanoparticles. Pin-on-disk tribometry of an MoS$_{3}$ coating using phenolic resin as the binder was conducted in a dry N$_{2}$ atmosphere (0.06 % RH, using normal loads of 5 N and 10 N). The results were compared with two types of commercial bonded coatings based on the solid lubricant molybdenum disulfide (MoS$_{2}$), as well as a bonded coating we formulated with commercial MoS$_{2}$ nanoparticles. Surprisingly, the MoS$_{3}$ coating showed similar lubricating ability to the MoS$_{2}$-based coatings, exhibiting average μ $_{k}$ < 0.05 and endurance greater than a million cycles. To evaluate the tribochemistry occurring in the contact region, tribotesting of an MoS$_{3}$ coating was halted when steady-state low friction was achieved (i.e., prefailure). Raman spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction on the surface of this wear track showed that the MoS$_{3}$ had undergone a tribochemical reaction to form the solid lubricant MoS$_{2}$, which explains the excellent lubricity of the coating. This result opens up the possibility of developing MoS$_{3}$ nanoparticle-based solid lubricant coatings and MoS$_{3}$ nanoparticle additives for oils and greases that are synthetically easier and lower cost than formulations based on MoS$_{2}$ nanoparticles.
Starting Page	543
Ending Page	554
Page Count	12
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	53
Issue Number	3
e-ISSN	15732711
Language	English
Publisher	Springer US
Publisher Date	2014-01-28
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Solid lubricants Nanotribology Molybdenum disulfide XPS Raman Friction-reducing coatings Space Vacuum tribology Tribology, Corrosion and Coatings Surfaces and Interfaces, Thin Films Theoretical and Applied Mechanics Physical Chemistry Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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