Dry sliding wear behaviour of cold-sprayed Cu-MoS2 and Cu-MoS2-WC composite coatings: The influence of WC

Abstract

Cold-sprayed Cu-MoS2 and Cu-MoS2-WC composite coatings were studied for their sliding wear performance in dry nitrogen. Presence of WC particles reduced friction coefficient and improved wear resistance. Dynamics of material transfer, chemical and phase composition of third bodies in the contact were examined. WC particles helped to form transfer films and smooth wear tracks; while rough wear tracks with evidence of detachment were observed for the Cu-MoS2. Subsurface microstructure of the wear tracks showed major microstructural change occurred around WC particles. Microstructure and thickness of the tribolayers at 100 and 1000 cycles exhibited minor changes. However, for Cu-MoS2, microstructural change took place more extensively with sliding, leading to unstable tribolayers, which contributed to crack formation, detachment, and eventually high wear.

Optimization of Mechanical Properties of Cr3C2-Ni20Cr/Graphite Cold Sprayed Coatings

“…Additionally, as other deleterious phenomena as particle oxidation, evaporation, melting, recrystallisation, or gas release are avoided, the obtained coatings are more durable with better bond strength. The research currently being conducted covers the deposition of composite coatings with a very diverse share of ingredients and include the matrix also containing a solid lubricant [7][8][9]. The basic problem is the selection of the matrix material and the solid lubricant and then determining their mutual proportions.…”

How Tribo‐Oxidation Alters the Tribological Properties of Copper and Its Oxides

“…[ 5–8 ] Among the various reaction products, oxides are recurrently formed. [ 1,9–12 ] Along with the relative motion, the loading is often associated with a temperature increase in the contact, resulting in oxide formation. [ 13,14 ] Normal and shear stresses are capable to accelerate the rates of chemical reactions and sometimes even their path and with that influence tribo‐oxide‐formation, friction, and occurring wear mechanisms.…”

Cold Sprayed Tungsten Armor for Tokamak First Wall

“…Even then, the studies employing such concept are limited in the literature and involve successful depositions of W-Cu by Kang and Kang [10] and Deng et al [11], W-Ni-Fe by Xia et al [12], and low tungsten content in W-90Ta coatings by Barnett et al [13] only. Considering their excellent wear properties, a significantly broader series of studies involved the research of cemented carbides in a form of WC-Co [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31], WC-Ni [32][33][34][35][36][37][38][39][40][41], WC-Co-Ni [42], WC-Co-Cr [31,[43][44][45], or WC-Cu-MoS 2 [46,47]. Unfortunately, the carbides could not be used for PFCs and so we could not built on these results.…”