Study on Tribological Properties and Mechanisms of Different Morphology WS2 as Lubricant Additives

Hu, Ningning; Zhang, Xiuheng; Wang, Xianghui; Wu, Na; Wang, Songquan

doi:10.3390/ma13071522

Cited by 21 publications

(15 citation statements)

References 31 publications

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“…Concerning lamellar WS 2 , easy shearing between the basal planes reduces friction, while spherical WS 2 behaves more like a micro-bearing. [94] One of the appealing properties of WS 2 films is their resistance to atomic oxygen, which makes WS 2 particularly interesting for use as solid lubricant coatings in aerospace applications. This property also helped to boost the performance of other materials.…”

Section: Transition Metal Disulfidesmentioning

confidence: 99%

Layered 2D Nanomaterials to Tailor Friction and Wear in Machine Elements—A Review

Marian

Berman

Rota

et al. 2021

Adv Materials Inter

121

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prominent members being molybdenum disulfide (MoS 2 ) and tungsten disulfide (WS 2 ). [2] In addition to graphene-and TMD-based nanomaterials, new 2D nanomaterials [3] such as silicenes, [4] hexagonal boron nitride (h-BN), [5] black phosphorous (BP), [6,7] halide structures, [8] metal-organic framework nanosheets, [9] and MXenes [10,11] are currently optimized regarding their synthesis methods and expectable yield. The coupling of excellent electrical and thermal conductivity with great mechanical properties, high surface-to-volume ratios, and the existence of surface terminations, which enable their chemical functionalization, has made these 2D nanomaterials promising candidates to be used in different applications such as energy storage devices and supercapacitors, [12] (photo)-catalysis, [13] water purification, [14] and tribological systems. [15][16][17][18] In the tribological context, 2D layered structures showed their great potential in improving friction and wear of various substrate materials under dry and lubricated conditions. With respect to the lubricated conditions, 2D materials are typically used as lubricant additives in base oils with the overall purpose to fulfill different functions in the contact area. During sliding, nanomaterials may act both as shearing films and nano-roller bearings, thus potentially changing the friction mode from sliding to rolling friction and regulating the resulting lubricant flow, thus reducing frictional losses. [19] Irrespective of the prevalence of dry or lubricated conditions, 2D materials may be capable of initiating tribo-chemical reactions in the contact area Recent advances in 2D nanomaterials, such as graphene, transition metal dichalcogenides, boron nitride, MXenes, allow not only to discover several new nanoscale phenomena but also to address the scientific and industrial challenges associated with the design of systems with desired physical properties. One of the great challenges for mechanical systems is associated with addressing friction and wear problems in machine elements. In this review, the beneficial properties of layered 2D materials that enable the control of their tribological behavior and make them excellent candidates for efficient friction and wear reduction in dry-running and boundary lubricated machine components are summarized. The recent studies highlighting the successful implementation of 2D structures when used as solid lubricant coatings or reinforcement phases in composites for various machine components including sliding and rolling bearings, gears, and seals are overviewed. The examples presented in the studies demonstrate the great potential for 2D materials to address the energy-saving needs by friction and wear reduction.

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Section: Transition Metal Disulfidesmentioning

confidence: 99%

Layered 2D Nanomaterials to Tailor Friction and Wear in Machine Elements—A Review

Marian

Berman

Rota

et al. 2021

Adv Materials Inter

121

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“…The addition of these MoS 2 particles enhanced the tribological performance of liquid paraffin, and the enhancement was most significant after the addition of MoS 2 nanosheets. Hu et al [92] compared the tribological performances obtained by using WS 2 with different morphologies as lubricant additives under various load conditions. The friction-reduction and anti-wear mechanisms of the different forms of WS 2 during the tribological process are shown in Fig.…”

Section: Metal Sulfidesmentioning

confidence: 99%

Inorganic nanomaterial lubricant additives for base fluids, to improve tribological performance: Recent developments

et al. 2021

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In this paper, we review recent research developments regarding the tribological performances of a series of inorganic nano-additives in lubricating fluids. First, we examine several basic types of inorganic nanomaterials, including metallic nanoparticles, metal oxides, carbon nanomaterials, and “other” nanomaterials. More specifically, the metallic nanoparticles we examine include silver, copper, nickel, molybdenum, and tungsten nanoparticles; the metal oxides include CuO, ZnO, Fe3O4, TiO2, ZrO2, Al2O3, and several double-metal oxides; the carbon nanomaterials include fullerene, carbon quantum dots, carbon nanotubes, graphene, graphene oxides, graphite, and diamond; and the “other” nanomaterials include metal sulfides, rare-earth compounds, layered double hydroxides, clay minerals, hexagonal boron nitride, black phosphorus, and nanocomposites. Second, we summarize the lubrication mechanisms of these nano-additives and identify the factors affecting their tribological performance. Finally, we briefly discuss the challenges faced by inorganic nanoparticles in lubrication applications and discuss future research directions. This review offers new perspectives to improve our understanding of inorganic nano-additives in tribology, as well as several new approaches to expand their practical applications.

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“…The average COF and wear scar diameter of the WS 2 nanosheets-based oil were decreased by 28.47% and 51.67% as compared to the oil, respectively. Hu and co-workers investigated the tribological behavior of WS 2 with different morphology (lamellar WS 2 and spherical WS 2 ) under varying loads and speeds conditions [109]. They proved that the COF of lubricating oil with lamellar WS 2 additive was reduced by 29.35% at the optimal condition and the minimum COF was recorded at ~100 N. The COF of lubricating oil with spherical WS 2 additive decreased by 30.24% and the minimum COF was observed at 120 N. The high-pressure behavior of spherical WS 2 was better than that of lamellar WS 2 .…”

Section: Tungsten Disulfide (Ws 2 )mentioning

confidence: 99%

Tribology of 2D Nanomaterials: A Review

Uzoma

Khadem

et al. 2020

Coatings

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The exfoliation of graphene has opened a new frontier in material science with a focus on 2D materials. The unique thermal, physical and chemical properties of these materials have made them one of the choicest candidates in novel mechanical and nano-electronic devices. Notably, 2D materials such as graphene, MoS2, WS2, h-BN and black phosphorus have shown outstanding lowest frictional coefficients and wear rates, making them attractive materials for high-performance nano-lubricants and lubricating applications. The objective of this work is to provide a comprehensive overview of the most recent developments in the tribological potentials of 2D materials. At first, the essential physical, wear and frictional characteristics of the 2D materials including their production techniques are discussed. Subsequently, the experimental explorations and theoretical simulations of the most common 2D materials are reviewed in regards to their tribological applications such as their use as solid lubricants and surface lubricant nano-additives. The effects of micro/nano textures on friction behavior are also reviewed. Finally, the current challenges in tribological applications of 2D materials and their prospects are discussed.

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Study on Tribological Properties and Mechanisms of Different Morphology WS2 as Lubricant Additives

Cited by 21 publications

References 31 publications

Layered 2D Nanomaterials to Tailor Friction and Wear in Machine Elements—A Review

Layered 2D Nanomaterials to Tailor Friction and Wear in Machine Elements—A Review

Inorganic nanomaterial lubricant additives for base fluids, to improve tribological performance: Recent developments

Tribology of 2D Nanomaterials: A Review

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