Self-Lubricating Materials for Extreme Condition Applications

John, Merbin; Menezes, Pradeep L.

doi:10.3390/ma14195588

Cited by 50 publications

(29 citation statements)

References 162 publications

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“…Adaptive processes are designed to achieve low-meltingpoint and easy-to-shear binary and ternary compounds considering some parameters such as, melting of soft metals or temperature-activated diffusion, interfacial tribo-reaction or environmental-assisted oxidation. (5) The tribological surfaces for reversible temperature, humidity, load, or vacuum are necessary for wide-range solid lubrication through a number of heat cycles. Micro-laminate structures are utilised to create temperature-adaptive composites or coatings with lubrication that limits tribo-reaction, melting, oxidation, or diffusion across a number of heat cycles.…”

Section: Discussionmentioning

confidence: 99%

“…During forming at high temperatures, the proper lubrication is required for decreasing the friction stresses, and avoiding seizures and galling. Tool wear occurs during high-speed dry machining due to abrasive, chemical, adhesive, and electrochemical wear [4,5,15]. Pantograph contact strips [4] deteriorate from arc discharge attack-induced adhesion and high-temperature mechanical impact.…”

Section: Solid Lubrication Mechanismmentioning

confidence: 99%

“…Solid lubricants are defined as solid materials that are consciously added to or naturally generated on contact surfaces while they are in motion to decrease wear and friction and offer protection from damage. These are primarily used in harsh conditions, i.e., high temperatures, abrupt changes between vacuum and moist air atmosphere, heavy loads, high speeds, chemically reactive environments, and severe thermal shock circumstances [1][2][3][4][5]. Severe wear and oxidation, high friction, and premature failure are unavoidable in the absence of a lubrication mechanism under the aforementioned operating circumstances.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal Characteristics and Tribological Performances of Solid Lubricants: A Mini Review

Mittal¹,

Singh²,

Sharma³

2023

Advances in Rheology of Materials

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Solid lubricants separate two moving surfaces and reduce wear. Materials’ ability to act as solid lubricants depends on their characteristics relative to contact surfaces. Chemically stable fluorides (BaF2, CaF2), boron nitride (h-BN), transition metallic sulphides (MoS2, WS2), soft metals (Au, Ag), binary and multi-component oxides, such as silver-containing sulphates, chromates, and oxides, and MXenes are effective solid lubricants. Solid lubrication depends on the material’s structure. Structure, mechanical properties, chemical reactivity, and kind of substance characterise these materials (refractories, ceramics, glass, etc.). High temperatures (>300°C) are obtained at asperities due to frictional heat produced when two surfaces rub. High temperatures can breakdown lubricants, but the resulting compounds must be lubricants; otherwise, corrosive vapours or abrasive solids can occur. High thermal conductivity helps lubricants remove heat generated by rubbing. Lubricants must not be melted, as the solid will lose strength and distort or be removed like liquid. Tensile strength, compressibility, and hardness are significant mechanical qualities for solid lubricants in extreme conditions. This chapter discusses solid lubricants and their structure. Also discussed are solid lubricants’ mechanical and thermal properties. The lubricating mechanism and conclusion are also conferred.

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Section: Discussionmentioning

confidence: 99%

Section: Solid Lubrication Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal Characteristics and Tribological Performances of Solid Lubricants: A Mini Review

Mittal¹,

Singh²,

Sharma³

2023

Advances in Rheology of Materials

View full text Add to dashboard Cite

show abstract

“…Reducing wear loss and strengthen the lubricating between the mechanical moving parts are the important ways to achieve the energy saving and material loss, and therefore wear-resistant materials, as an essential component in the operation of equipment, have increasingly high requirements for their frictional properties (Lin et al, 2011;Kuang et al, 2022). The use of lubricating oil or the self-lubricating structural parts is a common method to reduce friction and anti-wear (Maruyama et al, 2017;John and Menezes, 2021). However, liquid lubricating materials are susceptible to environmental factors and lose their lubricating effects in the harsh scenarios such as high vacuum, high load and extreme high or low temperature environments (Kian et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Tribological properties of carbon nanotube/polymer composites:A mini-review

Miao

Chen²,

Li³

et al. 2023

Front. Mater.

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With the development of modern industry, the requirements for mechanical equipment are increasingly stringent, and increasing attention has been paid to reducing wear or lubrication in the movement of mechanical structural parts. Polymers are widely used in the field of mechanical structural parts due to their high processing performance and comprehensive performance. However, the relatively weak mechanical and tribological properties of polymers limit their further application in mechanical equipment lubrication. Incorporation of fillers is a common method to improve the friction properties of polymers. Among various fillers, carbon nanotubes (CNTs) are considered the ideal fillers to significantly improve the tribological properties of polymers. Therefore, this paper reviews the tribological properties of carbon nanotube modified polymer materials. The tribological wear mechanism of polymers and the influence of friction-reducing fillers on the tribological properties of polymers and the related lubrication mechanism explanation are outlined, and the factors influencing the tribological properties of composites by carbon nanotubes and the related lubrication mechanism explanation are analyzed. The presented review will be beneficial for the production of high-performance polymer nanocomposites.

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“…One of these effects is providing a lower coefficient of friction and lower wear [19,20]. One of the important attributes for superior lubrication properties of solid nanoparticles is their potential to shear between the interacting surfaces as well as due to their inherent layered structures [21]. The incorporation of inorganic solid nanoparticles such as nano clays has been exploited for the fabrication of Pickering emulsions.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Study of Solid Lubricant Nano-Additives Incorporated in canola oil for Enhancing Energy Efficiency and Sustainability

2021

Self Cite

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In recent years, with the development of eco-friendly lubricants, different vegetable oils have been studied and found to improve the overall tribological performance compared to petroleum-based oils. Being one of the commonly used vegetable oils, canola oil has become popular due to its non-toxicity and low cost. However, this bio-lubricant lacks tribological performance compared to petroleum-based oils. To improve its performance, sustainable solid additives such as graphene nanoplatelet (GNP) and hexagonal boron nitride (hBN) have recently gained the researcher’s attention. While incorporating nanomaterials in the oil as additives is a promising way to improve base oil’s performance, the excessive use of nanoparticles can introduce undesirable effects. This study investigated canola oil’s tribological performances with the addition of 0.5, 1.0, 1.5, and 2.0 wt.% GNP and 0.5, 1.0, and 1.5 wt.% hBN nanoparticles. The dynamic viscosities of these seven settings showed higher viscosity for GNP-incorporated oils compared to that with hBN. The boundary lubrication regime was targeted for the coefficient of friction (COF) and wear analyses during each pin on the disk test. It was observed that for the GNP, 1.5 wt.% provided the minimum COF (52% less than base oil), whereas, for the hBN, 1.0 wt.% provided the lowest (40% less than base oil) values. Based on these insights, three nano lubricant mixtures were formulated by incorporating both GNP and hBN settings in different ratios. These mixtures provided an optimum positive synergy by reducing 56% friction and 90% wear compared to the base oil. These percentage values were significantly more compared to both GNP and hBN based lubricants in their individual settings. These improvements in the mixture were due to a composite film formed which protected the interacting surfaces and also due to the polishing mechanisms. Therefore, incorporating both these nanoparticles in canola oil could reduce friction and wear and thus help in better energy conservation.

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Self-Lubricating Materials for Extreme Condition Applications

Cited by 50 publications

References 162 publications

Thermal Characteristics and Tribological Performances of Solid Lubricants: A Mini Review

Thermal Characteristics and Tribological Performances of Solid Lubricants: A Mini Review

Tribological properties of carbon nanotube/polymer composites:A mini-review

Synergistic Study of Solid Lubricant Nano-Additives Incorporated in canola oil for Enhancing Energy Efficiency and Sustainability

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