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Transition metal dichalcogenides (TMD) are solid lubricant materials, specifically, intrinsic solid lubricants, whose crystal structure facilitates interfacial sliding/shear to achieve low friction and wear in sliding contacts and low torque in rolling contacts. This article provides information on sliding friction and wear behavior of unbonded, bonded, and vapor-deposited pure and composite MoS2 and WS2 coatings. It discusses the rolling-torque behavior and applications of vapor-deposited pure and composite MoS2 and WS2 coatings. The article concludes with information on various forms of TMD lubrication, namely, oils, greases, microparticle and nanoparticle additives.

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T.W. Scharf, Transition Metal Dichalcogenide-Based (MoS2, WS2) Coatings, Friction, Lubrication, and Wear Technology, Vol 18, ASM Handbook, Edited By George E. Totten, ASM International, 2017, p 583–596,

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