Article
Materials Science, Ceramics
Hikmet Cicek, Ozan Can Akar, Ihsan Efeoglu
Summary: TiNi/MoS2 functional solid lubricant coatings were deposited on 52100 and D2 steels using a closed field unbalanced magnetron sputtering system. The coatings showed high adhesion and multipass scratch resistance, with better performance observed on the 52100 steel.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Kaifeng Zhang, Lixia Huo, Junqin Duan, Xiaoying Lu, Xuehu Men, Cailing Xu, Hui Zhou
Summary: The morphology of molybdenum disulfide (MoS2) nanowires has a significant impact on the tribological performance of lubricant. This study found that adding 1.0 wt% MoS2 NWs to perfluoropolyether (PFPE) base oil can significantly improve friction and anti-wear properties under high vacuum conditions. The unique nanowire morphology and good dispersion of MoS2 NWs in PFPE contribute to the minimal friction coefficient and wear scar diameter achieved.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Materials Science, Coatings & Films
Tomas Hudec, Tomas Roch, Maros Gregor, Lubomir Orovcik, Marian Mikula, Tomas Polcar
Summary: Molybdenum disulphide (MoS2) is known for its exceptional tribological properties in inert and high vacuum environments, but rapidly degrades in humid and high temperature conditions. Mo-S-N coatings with nitrogen content of 31 at.% exhibited the best overall tribological performance in various testing conditions, surpassing pure MoS2 films.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Maksim V. Prozhega, Maksim M. Kharkov, Egor O. Reschikov, Georg I. Rykunov, Andrey V. Kaziev, Margarita S. Kukushkina, Dobrynya V. Kolodko, Tatiana V. Stepanova
Summary: This study compares the performance of MoS2 films deposited on different substrates using different deposition modes. The study found that the pretreatment method of the samples has an impact on the growth of the coatings.
Article
Multidisciplinary Sciences
Lili Zhang, Zhengrui Zhang, Ahad Amini Pishro, Siti Jahara Matlan
Summary: This paper investigates the effect of space irradiation on the lubricating properties of IL/(GO-MWCNT) solid-liquid lubricating coatings. The experimental results show that irradiation induces compositional changes in the coatings, including the decomposition of IL lubricants. Pr irradiation causes the most serious damage to the lubricating material, while UV irradiation causes the least damage.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Hikmet Cicek, Ozan Can Akar, Ihsan Efeoglu
Summary: In this study, functional solid lubricant coatings were successfully produced by integrating MoS2 solid lubricant films with crystalline TiNi films for the first time. The tribological properties of the coatings were investigated through various analyses, showing that TiNi/MoS2 coatings exhibited excellent friction properties under both atmospheric and high-temperature conditions.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Chemistry, Multidisciplinary
Peter Series, Eric Nicholson, Jason Tarn, Nima Barri, jean-Baptiste Chemin, Guorui Wang, Yann Michel, Chandra Veer Singh, Patrick Choquet, Aurelien Saulot, Tobin Filleter, Guillaume Colas
Summary: This article presents a novel MoS2 + tantalum lubricant coating that demonstrates adaptable performance in multiple environments, excelling as a lubricant in both terrestrial and space conditions.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Coatings & Films
Yijing Wang, Rongze Li, Xiaoqin Zhao, Yun Xue, Yulong An, Huidi Zhou, Jianmin Chen
Summary: In this study, Al2O3/MoS2 and Al2O3/Ag/MoS2 composite coatings were manufactured by impregnating the inherent pores and cracks inside Al2O3 and Al2O3/Ag coatings with MoS2 through vacuum impregnation and in-situ hydrothermal synthesis. The microstructure and mechanical properties of these coatings were analyzed, and the synergistic action of Ag and MoS2 on their tribological properties was discussed. The introduction of Ag and MoS2 into the defects of Al2O3/Ag/MoS2 coating not only reduced the wear rate but also enhanced the lubrication effect, providing excellent long-time lubricating performance due to the formation of a continuous lubricating film.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Andrey Bondarev, Ilia Ponomarev, Ruslan Muydinov, Tomas Polcar
Summary: Molybdenum disulfide (MoS2) is a solid lubricant that can be used in various forms, and it has been traditionally believed that oxygen contamination would negatively affect its sliding properties. However, this study shows that high oxygen content does not necessarily hinder the solid lubricant properties of MoS2 and may even result in lower friction and wear compared to pure MoS2.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Mechanical
Armin Seynstahl, Markus Polzer, Marcel Bartz, Sandro Wartzack, Stephan Tremmel
Summary: This study evaluates the tribological performance and possible compaction of pure and nitrogen-modified PVD-MoS2 coatings in a vacuum. The results show that both coatings have load-bearing solid lubrication, but with differences in material transfer and wear mechanisms. The nitrogen-modified MoS2 coating has less compaction and improved frictional behavior with a 17% reduction in the coefficient of friction.
Article
Metallurgy & Metallurgical Engineering
Shao Lifan, Kong Dejun
Summary: The addition of titanium increases the hardness of Cu10Al-Ti-MoS2 coatings, but the coefficient of friction and wear rate show an opposite trend. The wear mechanisms of Cu10Al-3Ti-8MoS2, -6Ti-8MoS2, and -9Ti-8MoS2 coatings mainly involve adhesive wear and abrasive wear.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2022)
Article
Engineering, Mechanical
Xiaofeng Wei, Wen Li, Xiaoqiang Fan, Minhao Zhu
Summary: An important prerequisite for developing high-performance industrial lubricating grease is to regulate the composition and structure of thickener for obtaining lubrication function. This study prepared MoS2-grafted attapulgite (ATP) hybrid as a grease thickener using a one-step hydrothermal method. The regulated-grease using ATP/MoS2 as a thickener in poly-alpha-olefin (PAO40) oil reduces friction (31.5%) and wear (37.5%) due to the synergy of ATP/MoS2 thickener with superior thickening and lubrication function.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
K. Bobzin, C. Kalscheuer, M. Thiex, K. Stahl, T. Lohner, E. Maier, M. Yilmaz
Summary: In this study, the self-lubrication mechanisms of PVD deposited Mo:S-modified nitride coatings (Cr,Al)N+Mo:S-g and Zr modified diamond-like-carbon coatings ZrCg were investigated. The results showed that (Cr,Al)N+Mo:S-g coating formed stable self-lubricating films under high pressure and pure rolling conditions, resulting in lower friction.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
Wei Wang, Wenjuan Chang, Shijie Ding, Yishen Qu, Yuan Gao, Kuaishe Wang
Summary: In this study, novel solid lubricant coatings including multi-layer graphene/silicon dioxide composites and sodium metaphosphate phosphate were prepared. The experimental results showed that the composites had excellent thermal stability at 800 degrees C and could reduce the COFs in the range of 400-800 degrees C. These findings are important for developing new lubricants for hot metal forming process.
ROYAL SOCIETY OPEN SCIENCE
(2023)
Article
Materials Science, Coatings & Films
Antony Joseph, V Gautham, K. S. Akshay, V Sajith
Summary: Combining hexagonal boron nitride (hBN) with molybdenum disulphide (MoS2) can enhance corrosion resistance properties of coatings, reducing corrosion rate and improving corrosion resistance. Increasing hBN content can further enhance corrosion resistance.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Pierrick Merino, Sophie Cazottes, Vincent Lafile, Marion Risbet, Aurelien Saulot, Salima Bouvier, Julie Marteau, Yves Berthier
Summary: This study successfully reproduced White Etching Layer (WEL) under pure mechanical conditions and investigated the effect of surface preparation on microstructure evolution. A multiscale characterization approach was used to understand the formation mechanism of mechanically formed WEL, and the influence of sample surface preparation conditions on wear behavior was studied.
Article
Chemistry, Multidisciplinary
Peter Series, Eric Nicholson, Jason Tarn, Nima Barri, jean-Baptiste Chemin, Guorui Wang, Yann Michel, Chandra Veer Singh, Patrick Choquet, Aurelien Saulot, Tobin Filleter, Guillaume Colas
Summary: This article presents a novel MoS2 + tantalum lubricant coating that demonstrates adaptable performance in multiple environments, excelling as a lubricant in both terrestrial and space conditions.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Olivier Bouillanne, Guilhem Mollon, Aurelien Saulot, Sylvie Descartes, Nathalie Serres, Guillaume Chassaing, Karim Demmou
Summary: This paper investigates the complex kinematics of deformable granular flows using a multibody meshfree model. The study focuses on the effects of cohesion, stiffness, and viscosity of the particles on their collective sheared flows in tribological contacts. The results provide insight into the relationships between these parameters and the emerging friction coefficient of the sheared interface.
Article
Engineering, Mechanical
A. Lazzari, D. Tonazzi, J. Brunetti, A. Saulot, F. Massi
Summary: This study experimentally and numerically characterizes the frictional and vibrational response of carbon-carbon (C/C) composite material at high temperature conditions. The results provide information on the material behavior and the occurrence of different vibrational phenomena.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Vincent Lafile, Julie Marteau, Marion Risbet, Salima Bouvier, Pierrick Merino, Aurelien Saulot
Summary: This study investigates the impact of wheel-rail contact and surface preparation on the microstructure of rails using a rolling contact bench. Combining microhardness measurements and scanning electron microscopy with electron backscattering diffraction, the study provides a comprehensive understanding of the sub-surface microstructure in relation to the contact conditions. The findings reveal that the presence of a corroded layer and sliding conditions result in decreased strain-hardening of the rails.
Article
Chemistry, Physical
Leo Thiercelin, Sophie Cazottes, Aurelien Saulot, Frederic Lebon, Florian Mercier, Christophe Le Bourlot, Sylvain Dancette, Damien Fabregue
Summary: This study conducted monotonic and cyclic shear tests using hat-shaped specimens in the temperature range of 20 degrees C to 400 degrees C to simulate the formation of WEL. The material showed a strong sensitivity to temperature, but it did not necessarily favor WEL formation.
Article
Engineering, Mechanical
Leo Thiercelin, Sophie Cazottes, Pierrick Merino, Aurelien Saulot, Frederic Lebon
Summary: Numerical models are needed to predict the lifetime of railtrack components by describing the apparition of microstructural defects that lead to material failure. This study proposes a phenomenological model based on microstructural evolution to describe the formation kinetics of mechanically-induced White Etching Layer (WEL). A detailed microstructural characterization was performed to identify suitable indicators for WEL formation. The proposed model was validated using tests performed in extreme load and sliding conditions.
Article
Engineering, Mechanical
Solene Barlemont, Guillaume Colas, Alexis Lenain, Pierre-Henri Cornuault
Summary: Bulk Metallic glasses (BMGs) are non-crystalline materials produced through a fast cooling process of liquid metallic alloy. The study investigates the relationship between the tribological behavior of Cu45Zr46Al7Nb2 BMG plates and six different countermaterials. The results indicate that friction and wear in the contact are strongly influenced by the creation of a third body, which depends on the countermaterial and the chemical affinities between the formed oxides.
Article
Engineering, Mechanical
Guillaume Colas, Pierre-Henri Cornuault, Yann Michel, Romain Petre Bordenave
Summary: Fretting wear is a common problem in spacecraft launches, causing anomalies. A study was conducted on a CubSat satellite that got stuck in its dispenser during a preflight test. Due to limited time before the launch, no parts of the satellite could be replaced. Therefore, a fretting test campaign was carried out at a tribometer scale to propose a lubrication solution for the damaged contacts. The study successfully reproduced the damages and particles observed on the rail surfaces, and eventually, grease was chosen as the lubricant for the satellite.
Article
Engineering, Mechanical
Samy Guidoum, Pierrick Merino, Aurelien Saulot, Yves Berthier, Sylvain Hervieu
Summary: The presence of leaves on the railhead surface causes a decrease in wheel-rail contact adhesion, posing safety concerns for rail traffic particularly in the autumn. The study demonstrates that the adhesion loss and generation of debris are influenced by variations in humidity and slip rates. Decreasing humidity leads to more adhesion loss and debris generation, while increasing humidity reduces the adhesion loss and generation of debris.
MECHANICS & INDUSTRY
(2022)
Article
Engineering, Mechanical
Martial Crozet, Yves Berthier, Aurelien Saulot, David Jones, Benyebka Bou-Said
Summary: This study aimed to identify the main parameters affecting wear in valve-seat contact within diesel engines, with a focus on controlling wear flows by adjusting global and local geometry without modifying material properties. Using dynamic models, test benches, and finite element models, the research enhanced understanding of degradation mechanisms and internal flows, providing insights into the stages of protective layer formation.
MECHANICS & INDUSTRY
(2021)
Article
Engineering, Mechanical
Guillaume Colas, Aurelien Saulot, Yann Michel, Tobin Filleter, Andreas Merstallinger
Summary: This study focuses on the challenge of lubricating space mechanisms, especially in the use of self-lubricating composites for ball bearings. The research shows that fibers are critical in trapping and utilizing transferred material for lubrication and stability. The equilibrium between internal cohesion and adhesion to counterparts is crucial for maintaining a stable transfer film, even in vacuum conditions where water appears to play a critical role.
Article
Engineering, Mechanical
Peter Serles, Khaled Gaber, Simo Pajovic, Guillaume Colas, Tobin Filleter
Article
Engineering, Mechanical
Yankui Song, Ke Xiao, Guo Xiang
Summary: The novelty of this study lies in constructing an Entropy-based wear and fluid-solid-thermal (FST) coupled model for journal bearings, and revealing the transient interaction behavior between wear evolution and FST evolution during repeated starting and stopping. The wear rate is measured experimentally, and the contact temperature, friction coefficient and normal contact force are obtained from the validated FST model. Wear tests and numerical calculations are conducted to validate the predicted wear rate and investigate the time-varying wear and FST evolution of journal bearings.
Article
Engineering, Mechanical
Xin-long Liu, Xin Guan, Yuan Zhong, Qian Xiao, Yong Cao, Wu-lue Zhang, Song Zhang, Yi-ting Zheng, Ming-sheng Gao, Dao-yun Chen, Wen-bin Yang
Summary: Gaps in the conductor rail joints of intercity trains have an impact on current transmission and the wear of carbon skateboards. These gaps decrease the coefficient of friction, increase electrical contact resistance, and affect the wear rate of carbon skateboards.
Article
Engineering, Mechanical
Yuhang Wu, Conglin Dong, Xiuqin Bai, Chengqing Yuan
Summary: The study developed a new composite material by incorporating hexagonal boron nitride (h-BN) particles into a thermoplastic polyurethane (TPU) matrix, which exhibited excellent self-lubricating properties and reduced frictional excitation forces. The addition of h-BN particles effectively reduced the coefficient of friction, decreased fluctuation amplitude, enhanced wear resistance, and attenuated vibration behaviors.
Article
Engineering, Mechanical
Tiancheng Ouyang, Xiuyang Sun, Wentao Tang, Yinxuan Li, Zhi Qun Tian, Yanzhou Li
Summary: By adding nitrogen-doped graphene and C60 nanoparticles to the lubricant, a highly efficient nano-lubricant with vibration and noise reduction properties is synthesized.
Article
Engineering, Mechanical
Xin Zhuo, Jun Cao, Haibo Huang, Li Liu, Xinkun Suo, Peiqing Ye, Zeshan Abbas
Summary: A polymer coating prepared by liquid spraying technology on the surface of 20CrMo steel demonstrates good tribological and anti-cavitation erosive properties. It can effectively replace CuPb24Sn copper alloy in valve plates for pumps under different lubrication conditions. The coating exhibits adhesive wear and reduces frictional loss, and mainly shows abrasive wear under complex working conditions. Its lipophilicity, high hardness to elastic modulus ratio, and corrosion resistance are the main influencing factors for its performance.
Article
Engineering, Mechanical
Md. Aminul Islam, Jiaren (Jimmy) Jiang, Yongsong Xie
Summary: Erosion-corrosion is a major factor in material loss and reduced useful life of hydro-transport equipment. This study evaluates the erosion-corrosion characteristics of different materials and finds that matrix wear affects the degradation of carbides. Sufficient wear and corrosion resistance in the surrounding matrix are important for good erosion-corrosion resistance.
Article
Engineering, Mechanical
Andre Dubois, Oussama Filali, Laurent Dubar
Summary: This study investigates the effect of surface roughness, contact pressure, and lubrication on the onset of galling in aluminum 6082-T6 using a pin-on-plate tribometer. The experimental results show that the roughness and lubricants play a significant role in preventing galling.
Article
Engineering, Mechanical
Jizhan Wu, Peitang Wei, Guoqiang Liu, Difa Chen, Xiuhua Zhang, Taimin Chen, Huaiju Liu
Summary: This study conducted a comprehensive evaluation of the DLC coating treatment on the loading capacity of gears and characterized the surface features and fatigue performance. The results demonstrate that DLC coating significantly improves the hardness and surface residual compressive stress of the gears, as well as enhances their contact fatigue performance.
Article
Engineering, Mechanical
Yangping Liu, Hwaran Lee, Annsley Mace, Jeremy L. Gilbert
Summary: An AFM-based single asperity tribology method was used to investigate the wear performance of carbides and base metal matrix in high carbon CoCrMo alloy. The wear behavior of the two types of carbides was stress-dependent and influenced by chemical composition. Cr-rich carbides exhibited higher wear resistance compared to Mo-rich carbides.
Article
Engineering, Mechanical
Zdenek Riha, Michal Zelenak, Akash Nag, Jakub Poloprudsky, Tomas Kruml, Sergej Hloch
Summary: This study investigates the erosion performances of a high-speed modulated jet (MWJ) and continuous water jet (CWJ). By comparing different nozzles and water jet powers, the effects of modulated and continuous jets on aluminum alloy were studied. The results show that under certain conditions, modulated jet can create deeper and sharper grooves while reducing the impact of lateral flow.
Article
Engineering, Mechanical
Chunyu Yu, Weipu Li, Yang Guo, Xianbin Sun, Fanli Hong, Ning Sun, Qinghai Zhang
Summary: This study explores the relationship between the wear rate of train brake pads and its features, and proposes a method for predicting the wear rate suitable for small sample data. Grey relational analysis and Pearson correlation analysis are used to determine the preferred features that affect the wear rate, and a BOA-BP model is established for prediction. The results show that BOA-BP exhibits better advantages in prediction with small samples.
Article
Engineering, Mechanical
Shan Yin, Xin Zhao, Shuangchao Huang, Zefeng Wen, Xuesong Jin
Summary: This study simulated the rolling contact of a driving wheelset over tangent and curved tracks at a speed up to 500 km/h using an explicit finite element approach to derive creep curves. The comparison between quasi-steady curves and transient curves in the presence of rail corrugation helped to identify cases where traditional theories are inapplicable and where transient effects must be considered. Additionally, the study further analyzed the influence of middle/high-frequency vibrations in the presence of rail corrugation.
Article
Engineering, Mechanical
Jiyao Zhang, Yuanlie Yu, Junlei Tang, Yingying Wang, Honggang Sun, Kaikai Song, Jianhong Gong, Pingping Liu, Xiaoming Liu, Lina Hu, Parthiban Ramasamy, Juergen Eckert
Summary: The influence of high-carbon addition on the microstructure, hardness, and wear behavior of CoCrNi alloy was investigated. It was found that the addition of carbon resulted in the formation of carbide particles, enhancing the hardness and improving the wear resistance. Fracture and detachment of hard carbides during friction introduced additional abrasive particles, transitioning the wear mechanism from adhesive-dominated to abrasive-dominated.
Article
Engineering, Mechanical
Yanfei Liu, Shengtao Yu, Ruize Zhang, Xiangyu Ge, Wenzhong Wang
Summary: This study reports the tribological behavior of nanodiamond plate (NDPL) as a nanoadditive for the first time and compares it with nanodiamond particles (NDPA). The results show that NDPL provides better lubrication performance at higher concentrations, and the sliding between NDPLs and the structural transformation from sp3 to sp2 carbon play a crucial role in lubrication and wear resistance.
