Superlubricity and running-in wear maps of water-lubricated dissimilar ceramics

Strey, Nathan Fantecelle; Ramos, Rogério; Scandian, Chérlio

doi:10.1016/j.wear.2022.204328

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…Frictional heat and debris are mainly generated between the contact surfaces, and graphite is easily consumed during dry sliding conditions. Water, as a lubricant, can not only form a lubricating film to separate contact surfaces but also play a role in cooling [18]. Meanwhile, in hydropower plants and marine ships, dynamic sealing composite ceramic components are required to serve under water lubrication conditions.…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Al2O3/Graphite-Al2O3 Laminated Composites under Water Lubrication Conditions

Di,

Wang,

Zhang

et al. 2024

Lubricants

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High-performance Al2O3/graphite-Al2O3 laminated composites exhibit an excellent self-lubricating ability for moving components, such as sliding shaft sleeves and dynamic seals. The tribological behaviors of Al2O3/graphite-Al2O3 laminated composites should be studied extensively under water working conditions. Here, we attempted to explore the practicability of the Al2O3/graphite-Al2O3 laminated composite as a sealing material from a tribological point of view under water lubrication conditions. The tribological properties and mechanism of friction and wear of laminated composite ceramics were investigated under dry sliding friction, water environment, and suspended particle working conditions. It was found that the Al2O3/graphite-Al2O3 laminated composite has a better friction performance under water lubrication compared to dry sliding because of the separation effects formed by a water molecule film and a transfer film. Meanwhile, the wear rate under dry contact was found to be approximately six times that under water lubrication conditions. Under the water lubrication conditions, the formation of graphite films and water-adsorbed layers improved the anti-wear properties of the laminated materials, and the friction coefficient and the wear rate were as low as 0.16 and 1.76 × 10−6 mm3/Nm, respectively. Under the suspended particle working condition, the solid particles destroyed the graphite lubricating film and abrasive wear dominated the wear mode. The Al2O3/graphite-Al2O3 laminated composite demonstrates a potential for application in dynamic sealing and sliding components.

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Section: Introductionmentioning

confidence: 99%

Tribological Properties of Al2O3/Graphite-Al2O3 Laminated Composites under Water Lubrication Conditions

Di,

Wang,

Zhang

et al. 2024

Lubricants

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“…Zhang et al 23 pinpointed the self- lubrication mechanisms of SiC ceramics allowing for a decrease of the initially relatively high coefficient of friction, results that are also validated in the work of Lafon-Placette et al 24 The good frictional properties of various ceramic coatings are also investigated in the works of Mortu et al 25 and Zhao et al 26 Murzin and Balyakin 27 demonstrated almost 30% decrease in the coefficient of friction of SiC specimens experimentally, through laser treatment that results in microstructuring of their surface. Strey et al 28 showed extremely low coefficients of friction are achievable in dissimilar ceramic contact pairs using water-based lubricants while Zhang 29 shows that water-lubricated SiC can surmount traditional metal-oil contact pairs exhibiting both lower coefficients of friction and higher bearing capacity.…”

Section: Introductionmentioning

confidence: 99%

Fully ceramic versus steel gears: Potential, feasibility and challenges

Vasileiou,

Rogkas,

Markopoulos

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The most common gear strength calculations performed in accordance with ISO/TC 60/SC 2 include surface durability and root bending strength. Typical geared power transmissions are characterized by high Hertzian contact stresses (surface durability) on the flanks – frequently in the order of 103 MPa – versus almost half an order magnitude lower first principal stresses on the tooth root (tooth bending strength). Therefore, the use of high strength special steel alloys is almost mandatory, especially in high-end applications, mainly to withstand the high contact stress values. Ceramic materials are typically characterized by high compressive strength versus very low flexural strength that at first glance makes them inefficient for gear transmissions since they are unlikely to withstand the tensile root stresses. Nevertheless, ceramic materials possess a number of advantages that makes them potential candidates for geared transmissions, such as their exceptional thermal properties, their low density (weight), their excellent wear characteristics and limited lubrication demands. The present work investigates the main challenges of using high-end ceramic gears and attempts to provide an insight on defining the design envelope of such gears to counter the main disadvantages. The increase of the normal pressure angle beyond the 25° limit set by ISO 6336 is primarily investigated, since in minimizes the tensile tooth root stresses, while also increasing the curvature of the contact surfaces without greatly increasing Hertzian stresses. Comparative assessment of the performance of fully ceramic gear designs versus their conventional steel counterparts is performed through quasi-static FEA simulations to set the basic design requirements for such gears and to promote further investigation of the feasibility of their usage in high power density applications.

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Macroscale Superlubricity with High Pressure Enabled by Partially Oxidized Violet Phosphorus for Engineering Steel

Zhang,

Chen,

Gao

et al. 2024

Adv Funct Materials

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As a novel cross‐structured 2D material, violet phosphorus (VP) promises to further develop the dynamic performance, energy efficiency, and service lifetime of mechanical components owing to its high strength and toughness, large carrier mobility, wide bandgap, and good friction‐reducing properties. In this work, the partially oxidized violet phosphorus nanosheets (oVP) are synthesized and employed as the lubricating additives in the poly alpha olefin (PAO) oil environment with less oleic acid (OA) improver, which can trigger the macroscale superlubricity on the diamond‐like carbon (DLC) film deposited steel surface at high loading pressures (>800 MPa) and sliding speeds (>0.1 m s−1). The friction coefficient (COF) of the steel‐DLC tribopair lubricated by the oVP‐PAO oil can reduce down to 0.0064 with little wear. At the high‐pressure sliding interface, the force‐thermal coupling action during the running‐in process promotes the cleavage and recombination of oVP nanosheets and OA molecules to form a reliable chemical adsorption tribofilm mainly composed of phosphorus oxides and amorphous carbon, which prevents the original asperities from direct contact and provides an ultralow shear strength. These findings suggest a new method to achieve macroscale oil‐based high‐pressure superlubricity for engineering steel through the lubrication and catalyzation effects of oVP.

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Superlubricity and running-in wear maps of water-lubricated dissimilar ceramics

Cited by 4 publications

References 33 publications

Tribological Properties of Al2O3/Graphite-Al2O3 Laminated Composites under Water Lubrication Conditions

Tribological Properties of Al2O3/Graphite-Al2O3 Laminated Composites under Water Lubrication Conditions

Fully ceramic versus steel gears: Potential, feasibility and challenges

Macroscale Superlubricity with High Pressure Enabled by Partially Oxidized Violet Phosphorus for Engineering Steel

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