Formation of discrete periodic nanolayered coatings through tailoring of nanointerfaces—Toward zero macroscale wear

Abstract

By engineering the interfaces, a coating with superior properties compared to conventional nanolayered coatings was designed.

Ultralow Macroscale Friction and Wear of MoS2 in High‐Vacuum Through DC Pulsing Optimization, Nitridization, and Sublayer Engineering

“…It has been proven that nanostructures with a lower degree of crystallinity and lower defect concentration exhibit higher elasticity. [3,35] This agrees with the results of our experiments and analyses.…”

“…Cr was selected as an adhesion layer because of its good adhesion to both the SKH51 substrate and Cr20 coating. [ 3 ] Automatic RF power (200 W) was used to deposit the Cr layer from a Cr (99.99% purity) target. The Cr20 coating consisted of carbon with embedded discrete but periodic Cr nanolayers.…”

“…[ 23 ] The results of these studies imply that, the friction and wear properties of MoS 2 , are depended on design of the supporting layers as much as on the design parameters of MoS 2 itself. In our recent study, [ 3 ] we reported on the design and fabrication of a novel C/Cr nanolayered coating wherein the Cr nanolayers were in a discrete but periodic form (denoted as Cr20 [ 3 ] ). Such a unique nanostructure was achieved through engineering and tailoring the characteristics of the nanointerfaces, including the degree of intermixing, defects, and Cr growth mode.…”

“…This becomes even more serious in the case of macroscale contacts, where the contact area is large, and the contact stress is high. [3] A promising solution is the use of solid lubricant coatings based on transition metal dichalcogenides (TMDs). [1,4,5] TMDs have gained attention because of their remarkably low friction under dry and vacuum conditions and their potential to replace liquid lubricants.…”

Feasibility of wear reduction for soft nanostructured thin film through enhanced elastic recoverability and contact stress relief

“…The I peak originates from either sp 2 bonding of transpolyacetylene segments at the boundaries or the stretching of CH or sp 3 bonding in the a-C structure [56]. The I, D, and G peaks were observed at 1,119, 1,384, and 1,558 cm −1 , respectively, with a full width at half maximum of 240, 316, and 168 cm −1 , respectively [57,58]. The intensity ratio of the D to G peaks (I(D)/I(G)) was calculated as 1.57, which indicated an sp 3 content estimation of approximately 30% [59].…”