Novel green lubricated materials: Aqueous PAI-MoS2-graphite bonded solid lubricating coating

Li, Bin; Xv, Weikang; Liu, Peng; Huang, Dequn; Zhou, Xinting; Zhao, Ruifang; Li, Shuangjian; Liu, Qunfeng; Jiang, Xin

doi:10.1016/j.porgcoat.2021.106225

Cited by 10 publications

(3 citation statements)

References 32 publications

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“…Ep-44 was the resin binder, which significantly influences the adhesion of the coatings. PI and PAI have excellent mechanical properties and can significantly enhance the wear resistance of the coatings after intermixing and curing with the resin [ 28 , 29 , 30 ]. PTFE has excellent lubricity and corrosion resistance and can be used as the lubricating phase to reduce the wear of the coatings [ 31 , 32 ].…”

Section: Methodsmentioning

confidence: 99%

The Tribological and Mechanical Properties of PI/PAI/EP Polymer Coating under Oil Lubrication, Seawater Corrosion and Dry Sliding Wear

Cao

et al. 2023

Polymers

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To investigate the tribological performance of a copper alloy engine bearing under oil lubrication, seawater corrosion and dry sliding wear, three different PI/PAI/EP coatings consisting of 1.5 wt% Ce2O3, 2 wt% Ce2O3, 2.5 wt% Ce2O3 were designed, respectively. These designed coatings were prepared on the surface of CuPb22Sn2.5 copper alloy using a liquid spraying process. The tribological properties of these coatings under different working conditions were tested. The results show that the hardness of the coating decreases gradually with the addition of Ce2O3, and the agglomeration of Ce2O3 is the main reason for the decrease of hardness. The wear amount of the coating increases first and then decreases with the increase of Ce2O3 content under dry sliding wear. The wear mechanism is abrasive wear under the condition of seawater. The wear resistance of the coating decreases with the increase of Ce2O3 content. The wear resistance of the coating with 1.5 wt% Ce2O3 is the best under-seawater corrosion. Although Ce2O3 has corrosion resistance, the coating of 2.5 wt% Ce2O3 has the worst wear resistance under seawater conditions due to severe wear caused by agglomeration. Under oil lubrication conditions, the frictional coefficient of the coating is stable. The lubricating oil film has a good lubrication and protection effect.

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Section: Methodsmentioning

confidence: 99%

The Tribological and Mechanical Properties of PI/PAI/EP Polymer Coating under Oil Lubrication, Seawater Corrosion and Dry Sliding Wear

Cao

et al. 2023

Polymers

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“…It should be noted that the temperaturedependent measurements of oxidation of monolayer MoS 2 usually take place at a temperature below 1,500 K in experiments (Park et al, 2021b;Grønborg et al, 2019;Walter et al, 2017). However, exposure to extreme spaceterrestrial environments or operating conditions can lead to instantaneous ultra-high temperatures for MoS 2 (Voevodin and Zabinski, 2005;Li et al, 2021). On the other hand, such a wide temperature range provides a better insight into temperaturedependent oxidation and hydrogenation mechanisms of MoS 2 , as MoS 2 readily reacts with O 2 but does not volatilize above 1,500 K from MD simulations (Rahman et al, 2021;Farigliano et al, 2020;Jo et al, 2020).…”

Section: Reaxff Molecular Dynamics Simulation Stepsmentioning

confidence: 99%

Oxidation and hydrogenation of monolayer MoS2 with compositing agent under environmental exposure: The ReaxFF Mo/Ti/Au/O/S/H force field development and applications

Mao

Zhang

Kowalik

et al. 2022

Front. Nanotechnol.

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An atomistic modeling tool is essential to an in-depth understanding upon surface reactions of transition metal dichalcogenides (TMDs), such as molybdenum disulfide (MoS2), with the presence of compositing agents, including Ti and Au, under different environmental exposures. We report a new ReaxFF reactive force field parameter set for Mo, Ti, Au, O, S, and H interactions. We apply the force field in a series of molecular dynamics (MD) simulations to unravel the impact of the Ti dopant on the oxidation/hydrogenation behaviors of MoS2 surface. The simulation results reveal that, in the absence of Ti clusters, the MoS2 surface is ruptured and oxidized at elevated temperatures through a process of adsorption followed by dissociation of the O2 molecules on the MoS2 surface during the temperature ramp. When the MoS2 surface is exposed to H2O molecules, surface hydrogenation is most favored, followed by oxidation, then hydroxylation. The introduction of Ti clusters to the systems mitigates the oxidation/hydrogenation of MoS2 at a low or intermediate temperature by capturing the O2/H2O molecules and locking the O/H-related radicals inside the clusters. However, OH− and H3O+ are emitted from the Ti clusters in the H2O environment as temperature rises, and the accelerating hydrogenation of MoS2 is consequently observed at an ultra-high temperature. These findings indicate an important but complex role of Ti dopants in mitigating the oxidation and hydrogenation of MoS2 under different environmental exposures. The possible mechanisms of oxidation and hydrogenation revealed by MD simulations can give an insight to the design of oxidation resistant TMDs and can be useful to the optical, electronic, magnetic, catalytic, and energy harvesting industries.

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“…Based on the degradation mechanisms, most efforts to reduce the friction and wear and increase the lifetime of MoS 2 -based coatings at high temperatures have focused on the alteration of MoS 2 surfaces for reduced oxygen and water adsorption. Binary or ternary doping materials, such as metals (titanium, aluminum, nickel, gold, chromium, vanadium, zirconium, and lead − ), carbon-based materials, , antimony trioxide (Sb 2 O 3 ), ,− and others, , have been proven to increase the coating density and hardness. Further, they act as thermal and oxygen diffusion barriers to improve the antioxidant characteristics of MoS 2 -based coating.…”

Section: Introductionmentioning

confidence: 99%

Magnesium Silicate Hydroxide–MoS₂–Sb₂O₃ Coating Nanomaterials for High-Temperature Superlubricity

Wang

Gao

Chang

et al. 2021

ACS Appl. Nano Mater.

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Expanding the low-friction temperature range of molybdenum disulfide-based coatings has been a topic of intense research interest. This paper introduces a coating concept, enabling achieving macroscale superlubricity, or near-zero friction, when exposed to open-air and high-temperature sliding conditions. This low-friction composite coating with a thickness of approximately 150−250 nm was accomplished by uniformly burnishing hydrothermally synthesized lamellate magnesium silicate hydroxide with an average diameter of 50 nm and an average thickness of 10 nm, molybdenum disulfide, and antimony trioxide powders onto a copper substrate. The tribological experiments performed in an open-air environment revealed that with the increase of testing temperature up to 200 °C or above (up to 300 or 400 °C), the coefficient of friction of the composite coating rapidly decreases and finally reaches the superlubricity state (the coefficient of friction is lower than 0.01). This intriguing superlubricity performance is attributed to the synergistic characteristics of lubricating antimony trioxide, molybdenum disulfide, and magnesium silicate hydroxide phases, enabling easy shearing of the film at high-temperature conditions. The results offer an approach for designing a solid lubricant solution for tribological applications.

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Novel green lubricated materials: Aqueous PAI-MoS2-graphite bonded solid lubricating coating

Cited by 10 publications

References 32 publications

The Tribological and Mechanical Properties of PI/PAI/EP Polymer Coating under Oil Lubrication, Seawater Corrosion and Dry Sliding Wear

The Tribological and Mechanical Properties of PI/PAI/EP Polymer Coating under Oil Lubrication, Seawater Corrosion and Dry Sliding Wear

Oxidation and hydrogenation of monolayer MoS2 with compositing agent under environmental exposure: The ReaxFF Mo/Ti/Au/O/S/H force field development and applications

Magnesium Silicate Hydroxide–MoS₂–Sb₂O₃ Coating Nanomaterials for High-Temperature Superlubricity

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Novel green lubricated materials: Aqueous PAI-MoS2-graphite bonded solid lubricating coating

Cited by 10 publications

References 32 publications

The Tribological and Mechanical Properties of PI/PAI/EP Polymer Coating under Oil Lubrication, Seawater Corrosion and Dry Sliding Wear

The Tribological and Mechanical Properties of PI/PAI/EP Polymer Coating under Oil Lubrication, Seawater Corrosion and Dry Sliding Wear

Oxidation and hydrogenation of monolayer MoS2 with compositing agent under environmental exposure: The ReaxFF Mo/Ti/Au/O/S/H force field development and applications

Magnesium Silicate Hydroxide–MoS2–Sb2O3 Coating Nanomaterials for High-Temperature Superlubricity

Contact Info

Product

Resources

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Magnesium Silicate Hydroxide–MoS₂–Sb₂O₃ Coating Nanomaterials for High-Temperature Superlubricity