Tribological performance of novel nickel-based composite coatings with lubricant particles

Abstract

Abstract:The present study is focused on the evaluation of the tribological performance of novel Ni/hBN and Ni/WS 2 composite coatings electrodeposited from an additive-free Watts bath with the assistance of ultrasound. Lubricated and non-lubricated scratch tests were performed on both novel composite coatings and on standard Ni deposits used as a benchmark coating to have an initial idea of the effect of the presence of particles within the Ni matrix. Under lubricated conditions, the performance of the Ni/hBN composite coating was very similar to the benchmark Ni coating, whereas the Ni/WS 2 behaved quite differently, as the latter did not only show a lower coefficient of friction, but also prevented the occurrence of stick-slip motion that was clearly observed in the other coatings. Under non-lubricated conditions, whereas the tribological performance of the Ni/hBN composite coating was again very similar to that of the benchmark Ni coating, the Ni/WS 2 composite coatings again showed a remarkable enhancement, as the incorporation of the WS 2 particles into the Ni coating not only resulted in a lower coefficient of friction, but also in the prevention of coating failure.

The electrodeposition of composite coatings: Diversity, applications and challenges

“…Ni coating, containing an embedded, blue-emitting, rare-earth mixed metal oxide particles of a BAM, doped BaMgAl11O17:Eu 2+ , was electrodeposited from an electrolyte containing a mixture of nonionic and cationic surfactants. The particle content in the deposit could be varied from 0 to 15.6 Ni/BN and Ni/WS2 composite coatings were electrodeposited from an additive-free Watts bath agitated by ultrasound [41]. Under lubricated conditions, the performance of the Ni/BN composite coating was very similar to the benchmark Ni coating, whereas the Ni/WS2 not only showed a lower coefficient of friction but also prevented the occurrence of stick-slip motion that was clearly observed in the other coatings.…”

Tribological behavior and microstructural evolution of lubricating film of silver matrix self-lubricating nanocomposite

“…Their researches indicated that the lubricating films were formed on worn surfaces of the composites during the friction and wear process, reducing the wear rates and friction coefficients. The addition of solid lubricant, such as MoS2 and NbSe2, promotes the formation of lubricating films, enhancing the wear resistance of the materials [6][7][8][9]. Moreover, the direct contact between the pin and disc is prevented by the lubricating film, and the adhesive wear of the materials was inhibited [20,31].…”

“…The lamellar structure is easy to slip between crystal lamellar sheets due to the anisotropy crystal of TMDs [3][4][5]. As the typical solid lubricants, the addition of TMDs enhances the tribological properties of metal matrix self-lubricating composites (MMSCs), including TiSe 2 , NbSe 2 , MoS 2 and WS 2 [6][7][8][9]. Recently, MMSCs with low friction are widely used as bushes for industrial applications and sliding electrical contact materials [10,11].…”

Investigation of tribological characteristics of nickel alloy-based solid-lubricating composites at elevated temperatures under vacuum

“…Under such cases, traditional liquid lubricants cannot provide the desired performance because of evaporation, decomposition, coking, and sealing, among other factors [7,8]. Instead, highperformance solid-lubricating materials show great potential to fulfill the requirements of reducing friction and wear resistance of the moving parts in these harsh environments [9][10][11][12][13]. As reported, NASA and the Air Force Research Laboratory developed two typical and pioneering solid-lubricating materials, respectively [1,[14][15][16][17].…”