Article
Engineering, Mechanical
Wei Sun, Xiaojun Liu, Kun Liu, Yan Zhang, Yunxiang Lu, Jiaxin Ye
Summary: This study confirms that a mechanistic synergy involving both load support ability and the induction of favorable tribochemistry is necessary for ultralow wear PTFE composites. The only filler that induced ultralow wear in the study was micron-sized GaN fiber which was friable under shear stresses.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Mark A. Sidebottom, Tomas F. Babuska, Sifat Ullah, Nathan Heckman, Brad L. Boyce, Brandon A. Krick
Summary: The study reveals that certain alpha-phase alumina filler particles can significantly reduce the wear rate of polytetrafluoroethylene (PTFE), and the size, porosity, and composition of the particles play important roles in this effect. The friability of the particles is found to be a key factor in creating ultralow wear PTFE-metal-oxide composites. A mechanistic framework is established to relate particle fracture toughness and wear, allowing for the selection of filler particles without relying solely on empirical tests.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Mechanical
Wahyu Wijanarko, Hamid Khanmohammadi, Nuria Espallargas
Summary: Ionic liquids have been studied as lubricant additives, showing different friction performances in polar and non-polar lubricants. In polar lubricants, the presence of ionic liquids led to high friction and wear due to tribocorrosion processes, while in non-polar lubricants, they resulted in low friction and wear due to stable passive/tribofilms formation. Among all tested lubricant additives, BMP in non-polar lubricants showed the best tribological performance.
Article
Engineering, Mechanical
Shuguang Fan, Chuanping Gao, Guangbin Yang, Yujuan Zhang, Chunli Zhang, Ningning Song, Shengmao Zhang, Pingyu Zhang, Zhijun Zhang, Shanjun Ke
Summary: The study found that magnetic field can improve material transfer, accelerate tribofilm formation, and reduce stress concentration of the tribofilm. It also enhances the structure and properties of the tribofilm, giving it superior wear-resistance ability.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Chemistry, Physical
Tuong Ly Kiet Dao, Anh Kiet Tieu, Bach Hoang Tran, Sang The Pham
Summary: In this study, it was found that five out of eight LDHs could induce hierarchical protective tribofilms, reducing wear and friction loss. Co-based tribofilms showed the best antiwear performance. The mechanical properties of different tribofilms were also demonstrated. The study provides insights into the tribochemical and lubrication mechanisms between LDHs and sliding surfaces.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Jiaqi He, Jianlin Sun, Yanan Meng, Huajie Tang, Ping Wu
Summary: In this study, MoS2-Al2O3 nanocomposite was synthesized using a solvothermal method, and a water-based nanofluid containing MoS2-Al2O3 nanoparticles was prepared which showed good stability and wettability. The tribological properties of the nanofluid under steel/steel contact were investigated, revealing significant reduction in friction force and wear rate. The excellent lubrication performance was attributed to the entry and movement of nanoparticles at the friction interface, as well as the formation of a double-layer tribofilm due to interfacial tribochemistry.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Engineering, Mechanical
Huimin Qi, Wen Hu, Hongtu He, Yafeng Zhang, Chenfei Song, Jiaxin Yu
Summary: This study investigated the nano- and macro-tribological properties of PL glass through friction tests, revealing that the COF of PL glass against SiO2 has opposing trends in humid air compared to dry air. The results also show that material removal for PL glass is better facilitated by humid air due to stress-enhanced hydrolysis, making the worn surface less susceptible to cracking at the macro-scale.
Article
Engineering, Mechanical
Abdel Dorgham, Pourya Parsaeian, Abdullah Azam, Chun Wang, Konstantin Ignatyev, Fred Mosselmans, Ardian Morina, Anne Neville
Summary: The study found that Ashless DDP additives can form better protective tribofilms on steel surfaces, providing superior antiwear protection and lower friction coefficients.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Ping Yu, Ren He, Guitao Li, Yuexia Guo, Nikolai K. Myshkin, Ga Zhang
Summary: The growth of solid tribofilms between moving parts can reduce friction and wear, but it often relies on environmentally harmful additives. This study demonstrates that by using CoAl layered double hydroxide (LDH) nanoplatelets as additives in epoxy nanocomposites, the need for harmful additives can be minimized while still achieving excellent tribological performance.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
A. Shirani, Y. Li, J. Smith, J. F. Curry, P. Lu, M. Wilson, M. Chandross, N. Argibay, D. Berman
Summary: Wear and degradation of interfaces are common problems in various industries, impacting the efficiency and functionality of mechanical assemblies. To improve tribological applications, new materials need to be developed that can resist degradation and wear in extreme environments, while also benefiting from them. By using hard, catalytic interfaces, protective or self-healing lubricious films can be formed through mechanochemical interactions during sliding on Pt-Au alloys in an ethanol environment. The films exhibit a highly graphitic structure and their formation is influenced by temperature and contact pressure. These findings provide new insights into contact transformations and offer a solution for addressing tribological challenges in mechanical systems operated in low viscosity fuels.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Chemistry, Physical
Long Wang, Anh Kiet Tieu, Guojuan Hai, Jiaqing Li, Hongtao Zhu, The Pham Sang, Jun Yang
Summary: The study demonstrates an improved load-carrying capability of a composite of sodium carbonate and graphene in lubricated contacts under heavier loads, reducing friction and wear significantly. The enhanced lubricating property is attributed to stronger adhesion of the composite on the steel surface and the formation of a sliding-induced soft tribofilm.
Article
Engineering, Mechanical
Junhong Jia, Songsong Han, Guang Yang, Liang Cheng, Xiaoxiao Yang, Junxian Zuo, Wenpeng Bai, Ganyu Bai
Summary: Ti-40Al-10V alloys with nearly lamellar structure (HIPed) and refined (B2+gamma) microstructure (HT) were studied for their tribological behavior at elevated temperatures. The study revealed that HIPed samples exhibited low friction coefficients due to high ratios of TiO2/Al2O3, while HT samples showed improved wear resistance because of the closely adhered oxide film.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Yusong Lin, Ren He, Yongkun Xu, Jianjun Zhang, Bernd Wetzel, Ga Zhang
Summary: This study investigates the effect of nickel (Ni) particles on the tribological performance of polyimide (PI) and PI reinforced with carbon fiber (CF) materials. The results show that PI composites filled with Ni exhibit ultra-low friction and wear, surpassing the friction-reduction capabilities of CF. The researchers provide direct evidence for the formation of an extremely thin NiO glaze layer on the steel counterface, above which a uniform C-based tribofilm is formed. The NiO layer is believed to catalyze the dehydrogenation of oil molecules and promote the formation of the tribofilm. This work proposes a design concept of high-performance tribofilm for improving the boundary lubrication of motion components.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Jiang Wei, Wei Sun, Kun Liu, Xiaojun Liu, Kaisen Zhang, Qing Zhang, Jiaxin Ye
Summary: Prior studies have shown that mechanical interlocking, preferential adhesion, and PTFE tribochemistry all play a role in reducing wear in polar polymer-filled PTFE composites, but their relationships are poorly understood. This study aimed to investigate the wear and tribofilm environmental sensitivities of a 5 wt% polyamide-imide (PAI) filled PTFE composite to untangle these mechanisms. The results revealed a strong correlation between a carboxylate-salt-rich transfer film and ultralow wear, as well as a tribochemical interface gradient that discourages transfer film removal. It is proposed that PTFE tribochemistry induces ultralow wear through increased transfer film adhesion and cohesion, promoting a surface energy interface gradient beneficial to low wear.
Article
Engineering, Mechanical
Ruixuan Wu, Chenfei Song, Haihong Wu, Bin Lv, Yanyan Zhang, Yongzhen Zhang
Summary: This study investigated the variation in the current-carrying tribological properties of Cu-C pairs and the related wear mechanism at different relative humidities. The results showed that the current-carrying coefficient of friction and contact resistance initially increased and then decreased, reaching maximum values at a relative humidity of 30%. Formation of a tribofilm and reduced abrasive wear were observed with an increase in humidity. The humidity-assisted carbon transfer increased the atomic percentage of C in the tribofilm. Even for an existing tribofilm, the coefficient of friction increased immediately once the humidity support was lost.
Article
Engineering, Multidisciplinary
Haoqi Zhang, Andrew N. Dickson, Yong Sheng, Terry McGrail, Denis P. Dowling, Chun Wang, Anne Neville, Dongmin Yang
COMPOSITES PART B-ENGINEERING
(2020)
Article
Electrochemistry
Richard Barker, Benjamin Pickles, Trevor L. Hughes, Evgeny Barmatov, Anne Neville
ELECTROCHIMICA ACTA
(2020)
Article
Crystallography
Amthal Al-Gailani, Thibaut V. J. Charpentier, Olujide Sanni, Richard Crisp, Jantinus H. Bruins, Anne Neville
JOURNAL OF CRYSTAL GROWTH
(2020)
Article
Energy & Fuels
William Keogh, Anne Neville, Qingxia Liu, Liyuan Feng, Chenxin Jin, Frank Moller Nielsen, John Helge Olsen, Salima Baraka-Lokmane, Jon Arne Ellingsen, Stuart Micklethwaite, David Harbottle, Thibaut Charpentier
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2020)
Editorial Material
Engineering, Mechanical
Ardian Morina, Tomasz Liskiewicz, Anne Neville
TRIBOLOGY INTERNATIONAL
(2020)
Article
Chemistry, Physical
Xiaoyan He, Feng Tian, Xiuqin Bai, Chengqing Yuan, Chun Wang, Anne Neville
APPLIED SURFACE SCIENCE
(2020)
Article
Engineering, Mechanical
Thawhid Khan, Yukio Tamura, Hiroshi Yamamoto, Ardian Morina, Anne Neville
Summary: Nitriding is a common process used in industry to enhance the tribological properties of components. This study investigated the influence of different ferrous layers formed by variant nitriding treatments on friction and wear performance, finding that a sulfide (FeS) layer produced the lowest friction and wear due to its lubrication properties. The research highlights how the type of ferrous layer can impact the tribological and tribochemical properties of nitride samples.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Doris Nekesa Khaemba, Abdullah Azam, TianLong See, Anne Neville, Farnaz Motamen Salehi
TRIBOLOGY INTERNATIONAL
(2020)
Article
Engineering, Mechanical
Cayetano Espejo, Chun Wang, Benoit Thiebaut, Catherine Charrin, Anne Neville, Ardian Morina
TRIBOLOGY INTERNATIONAL
(2020)
Article
Engineering, Mechanical
Hui Cen, Piet M. Lugt
Summary: The impact of start-stops on the thickness of lubricating films in grease lubricated rolling bearings differs from that in oil lubricated bearings. The film thickness quickly drops to zero during a stop and unexpectedly increases to a large value when started again, due to additional track replenishment during the stop.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Agronomy
Yaohui Li, Junjun Shi, Hui Cen, Jingfang Shen, Yanpu Chao
Summary: The proposed method improves the GEI criterion into dual objectives and utilizes multi-objective PSO method to optimize these objectives, producing the Pareto frontier for updating the Kriging model. Test results show that this method outperforms other classical optimization methods in terms of convergence and accuracy.
AGRICULTURAL WATER MANAGEMENT
(2021)
Article
Materials Science, Multidisciplinary
Hui Cen, Dan Bai, Yanpu Chao, Yaohui Li, Ruihua Li
Summary: Two lubricants containing ZDDP additive were tested at different relative humidities, showing that higher humidity led to lower friction and micropitting levels but increased wear. This was attributed to thinner tribofilms and hydrolysis of the ZDDP additive, as well as limited access to the substrate due to polar water molecules. The differences in tribological and tribochemical performance were also influenced by the varying polarities of the base oils used.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Engineering, Mechanical
Yan Pu Chao, Hao Yi, Hui Cen, Yao Hui Li
Summary: Liquid-metal direct writing technology shows great potential for customized fabrication of flexible circuits and functional devices, but faces challenges in smooth ink flow and conveying.
MECHANICAL SCIENCES
(2021)
Review
Materials Science, Coatings & Films
Hui Cen, Dan Bai, Yanpu Chao, Yaohui Li, Ruihua Li
Summary: The electrical capacitance method has been used to measure elastohydrodynamic lubrication film thickness in rolling element bearings since the 1970s due to its direct measurement capabilities in metallic components and simple theory. This article summarizes the evolution of the method and issues related to film thickness measurements, discussing the different methods for converting measured capacitance into film thickness, including calculating capacitance in the contact area and dielectric constant, or using calibration tests. Strengths and weaknesses of these methods are explored based on published research.
TRIBOLOGY-MATERIALS SURFACES & INTERFACES
(2021)
Article
Engineering, Mechanical
Gerda Vaitkunaite, Cayetano Espejo, Chun Wang, Benoit Thiebaut, Catherine Charrin, Anne Neville, Ardian Morina
TRIBOLOGY INTERNATIONAL
(2020)
