Superlow friction of amorphous diamond-like carbon films in humid ambient enabled by hexagonal boron nitride nanosheet wrapped carbon nanoparticles

Chun, Bai; An, Liwei; Zhang, Jing; Zhang, Xingkai; Zhang, Bin; Li, Qiang; Yu, Yuanlie; Zhang, Junyan

doi:10.1016/j.cej.2020.126206

Cited by 55 publications

(10 citation statements)

References 45 publications

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“…The B 1s spectra could be fitted into two peaks at 190.3 and 191.4 eV, which can be attributed to the B−N and B−O bonds, respectively. N 1s could be fitted into two peaks at 397.9 and 398.6 eV, corresponding to N-B and N−H, respectively [43]. On the basis of the aforedescribed analysis, it can be concluded that the hydroxyl group was successfully modified onto the surface edge of the BNNs.…”

Section: Characterization Of Ho-bnnsmentioning

confidence: 79%

Macroscale superlubricity achieved via hydroxylated hexagonal boron nitride nanosheets with ionic liquid at steel/steel interface

et al. 2021

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Macroscale superlubricity is a prospective strategy in modern tribology to dramatically reduce friction and wear of mechanical equipment; however, it is mainly studied for point-to-surface contact or special friction pairs in experiments. In this study, a robust macroscale superlubricity for point-to-point contact on a steel interface was achieved for the first time by using hydroxylated modified boron nitride nanosheets with proton-type ionic liquids (ILs) as additives in ethylene glycol aqueous (EGaq). The detailed superlubricity process and mechanism were revealed by theoretical calculations and segmented experiments. The results indicate that hydration originating from hydrated ions can significantly reduce the shear stress of EGaq, which plays an essential role in achieving superlubricity. Moreover, the IL induces a tribochemical reaction to form a friction-protective film. Hydroxylated boron nitride nanosheets (HO-BNNs) function as a polishing and self-repairing agent to disperse the contact stress between friction pairs. Superlubricity involves the change in lubrication state from boundary lubrication to mixed lubrication. This finding can remarkably extend the application of superlubricity for point-to-point contact on steel surfaces for engineering applications.

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Section: Characterization Of Ho-bnnsmentioning

confidence: 79%

Macroscale superlubricity achieved via hydroxylated hexagonal boron nitride nanosheets with ionic liquid at steel/steel interface

et al. 2021

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“…h-BN has received lots of attention as a promising material for fluidic lubrication in addition to its excellent solid lubricating ability due to its unique chemical, structural, and mechanical properties. Its high thermal stability and great chemical stability toward oxidation facilitate the good solid lubricating application. − The layer structure and strong protective boundary film formation into the sliding interfaces facilitate the lubrication mechanism . Lee et al investigated the frictional characteristics of h-BN using the friction force microscopy technique when it was deposited on the silicon oxide substrate .…”

Section: Introductionmentioning

confidence: 99%

“…24−27 The layer structure and strong protective boundary film formation into the sliding interfaces facilitate the lubrication mechanism. 28 Lee et al investigated the frictional characteristics of h-BN using the friction force microscopy technique when it was deposited on the silicon oxide substrate. 29 They observed that with increasing number of h-BN layers on the substrate, the coefficient of friction (COF) decreased considerably.…”

Section: Introductionmentioning

confidence: 99%

Covalently Linked Hexagonal Boron Nitride-Graphene Oxide Nanocomposites as High-Performance Oil-Dispersible Lubricant Additives

Samanta

2020

ACS Appl. Nano Mater.

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The present study demonstrates an improved and facile method for the exfoliation and chemical oxidation of bulk hexagonal boron nitride (h-BN) powder. Further, chemical functionalization of oxidized h-BN with (3-aminopropyl) trimethoxysilane (APTMS) as a bifunctional chemical linker has been undertaken to prepare APTMS-grafted h-BN (h-BNAS). Amino-terminated functional groups on the basal plane defect and edge sites of h-BNAS were targeted for further chemical grafting with graphene oxide (GO) through covalent interaction to achieve an h-BN/GO nanocomposite (h-BNAS@GO). The chemical structure and morphology of h-BN, oxidized h-BN, h-BNAS, and h-BNAS@GO were investigated through standard spectroscopic and microscopic analyses. The macro- and microtribological results depicted that the h-BNAS@GO hybrid composite (0.5 wt %) as an oil-dispersible additive significantly reduced the coefficient of friction (COF) and wear of the steel-steel tribopair, revealing superior tribological properties. The COF of h-BNAS@GO nanocomposite exhibited a reduction of 50.7% (at P m ≈ 1.95 GPa) than that of base paraffin oil and showed a lower specific wear rate (1 × 10–8 mm3/N-m) at macrotribological trials, revealing the best wear-resistance performance. At microtribological reciprocating sliding, the composite nanolubricant was observed to diminish the COF by ∼41.18% (at P m ≈ 2.15 GPa) compared to base oil. The post-tribological analysis of the worn tribotracks demonstrates that the h-BNAS@GO nanocomposite has a superior ability to adhere and form a thicker, continuous, synergetic lubricating tribofilm at the interfaces, thereby effectively reducing COF and protecting the tribopairs from wear. Therefore, the h-BNAS@GO nanocomposite has a great prospect as a load-bearing lubricating advanced material in convenient industrial application.

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“…As for the macroscale lubrication application of h -BN, the feasibility as a protective coating or as a lubricant additive in water and oil has been proposed. Before implementation, extensive studies were performed to address the poor colloidal stability and inferior film-forming ability of h -BN by exfoliation and modification. − It is generally recognized that h -BN is readily transferred to the counterface, which is considered responsible for antifriction behaviors .…”

Section: Introductionmentioning

confidence: 99%

Friction Behavior and Structural Evolution of Hexagonal Boron Nitride: A Relation to Environmental Molecules Containing −OH Functional Group

Chun

Yang

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Sliding contact experiments and first-principles calculations were performed to elucidate the roles of environmental molecules containing −OH functional groups on the friction behavior and structural evolution of hexagonal boron nitride (h-BN). A significant decrease in the friction coefficient (COF) is established by the physisorption and dissociative adsorption of molecules containing −OH functional groups on h-BN, compared with that in a H2 or N2 atmosphere. A key finding is the existence of two friction mechanisms to reconstruct the sliding interface for h-BN crystallites in humid air and carbon contaminant (CH3OH and C2H5OH) atmospheres, which is verified by the friction behavior and morphologies of the wear track. There is a running-in period in the friction process to induce the formation of defects in h-BN in humid air, which facilitates dissociative adsorption of water molecules on h-BN. The formation of nanostructured water at defect sites will promote lamellar slip of h-BN crystal materials for friction reduction. In carbon contaminant environments, both molecules exhibit strong adsorption on the h-BN surface regardless of the presence of defects, thereby weakening the structural damage rate and enhancing the bearing capacity. C2H5OH molecules are more likely to dissociate and bind onto defect sites, endowing h-BN with high in-plane stress to form a coiled structure. h-BN in the annular or tubular form would exhibit a self-protective effect, facilitate incommensurate contact, and reduce the contact area to enhance lubrication. Our work may establish the fundamental basis for future applications of h-BN in new energy vehicles.

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Superlow friction of amorphous diamond-like carbon films in humid ambient enabled by hexagonal boron nitride nanosheet wrapped carbon nanoparticles

Cited by 55 publications

References 45 publications

Macroscale superlubricity achieved via hydroxylated hexagonal boron nitride nanosheets with ionic liquid at steel/steel interface

Macroscale superlubricity achieved via hydroxylated hexagonal boron nitride nanosheets with ionic liquid at steel/steel interface

Covalently Linked Hexagonal Boron Nitride-Graphene Oxide Nanocomposites as High-Performance Oil-Dispersible Lubricant Additives

Friction Behavior and Structural Evolution of Hexagonal Boron Nitride: A Relation to Environmental Molecules Containing −OH Functional Group

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