Article
Materials Science, Textiles
Dong Hu, Zhiwei Guo, Tian Jun, Chengqing Yuan
Summary: This study investigates the addition of hydrophilic PVA fibers to water-lubricated stern bearing materials to fabricate TPU/PVA fiber composites, which showed improved tribological properties and enhanced self-lubrication performance under experimental conditions.
FIBERS AND POLYMERS
(2021)
Article
Materials Science, Multidisciplinary
Shengkang Dong, Zhiwei Guo, Hongshuang Zang, Chengqing Yuan
Summary: In this study, the tribological properties of polytetrafluoroethylene (PTFE) water-lubricated composites were investigated with different silicon carbide (SiC) content and particle size. The results showed that the wear resistance of PTFE composites can be significantly improved with a filling amount of 3-5 wt.% SiC particles. The composites with 5 wt.% SiC reduced wear loss by 99.44%. The friction and wear properties of the composites decreased as SiC particle size increased, and the wear mechanism shifted from adhesive to abrasive. The PTFE composites filled with 40 nm SiC particles exhibited the best wear resistance. This study provides an experimental basis for the development of high-performance PTFE water-lubricated bearings.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Engineering, Mechanical
Guangwu Zhou, Kepeng Wu, Wei Pu, Peng Li, Yanfeng Han
Summary: This paper investigates the modification effects of different nano-fillers on the basic formulation of hydrogenated nitrile rubber (HNBR). The results show that UHMWPE and GF have different improvements on the tribological performance of rubber materials under different speed conditions. To achieve the best comprehensive performance, appropriate nano-fillers should be selected for modification according to the operating conditions.
Article
Engineering, Chemical
Ya-Jie Mao, Ping-Ping Gao, Zhao-Bo Sun, Jian-Hua Tang, Kun Dai, Hao Lin, Gan-Ji Zhong, Zhong-Ming Li
Summary: This study developed a novel potential approach for large-scale preparation of self-lubricating TPU composites, which showed improved tribological properties without sacrificing or even enhancing their mechanical properties, through melt processing modification with PUF microcapsules containing lube base oil.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Engineering, Mechanical
Tao He, Zhongliang Xie, Xin Tao, Kang Yang, Jian Jiao, Minli Huang, Wensheng Ma
Summary: This study proposes a water-lubricated stern bearing with self-adaptation capacity for load equalization and vibration reduction. By using elastic elements and damping alloy, the bearing can improve the service life and reduce vibration response.
Article
Engineering, Mechanical
Deepak K. Prajapati, P. Ramkumar
Summary: This study investigates the effect of non-Gaussian surface topography on the tribological performance of water-lubricated journal bearings under mixed-elastohydrodynamic lubrication regime. It is found that skewness significantly affects both asperity contact pressure and hydrodynamic pressure. The study also discusses the influence of bearing length to diameter ratio on the lubrication performance.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2022)
Article
Engineering, Mechanical
Xueshen Liu, Xincong Zhou, Chaozhen Yang, Jian Huang, Peng Wang
Summary: This paper investigates the interaction between nano-SiO2 and NBR and its effect on the tribological properties of water-lubricated NBR-based composites. The results show that the strength of the interface bonding affects the wear mechanism and friction performance of NBR. Surface-modified SiO2(TESPT) particles have stronger interface bonding with the matrix, which improves the wear resistance of NBR but also increases the friction coefficient of the composite.
Article
Materials Science, Multidisciplinary
Abdulhammed K. Hamzat, Akeem Y. Adesina, Tahir Rasheed, Mohammed Abdul Samad
Summary: The effect of different concentrations of nanoclay on the tribological and mechanical properties of epoxy composite coatings was investigated. The results showed that the concentration of nanoclay affected the friction coefficient and hardness of the coatings, and the optimum concentration exhibited better performance under seawater conditions.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Polymer Science
Qiran Xu, Zhiwei Guo, Qiren Huang, Chengqing Yuan
Summary: Polyurethane has been studied extensively as a multifunctional material for water-lubricated bearings, and the content of MOCA directly affects its properties. Five samples with different MOCA contents were prepared and tested, showing that the optimal performance was obtained with a specific ratio. The research provides a theoretical basis for the application of polyurethane elastomer in water-lubricated bearings.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Engineering, Mechanical
Pravin P. Patil, Yatika Gori, Ashwani Kumar, M. R. Tyagi
Summary: This research work examined the tribological performance of Polyisobutylene (PIB) as a viscosity index improver under boundary/mixed and hydrodynamic lubricated conditions. The study found that a 15% concentration of PIB blend significantly reduced wear and friction, but higher concentrations showed an increase in friction.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Polymer Science
Xian-Chao Jin, Tian-Jun Yue, Bai-Hao Ren, Wei-Min Ren, Xiao-Bing Lu
Summary: In this study, a novel thermoplastic polyurethane (TPU) elastomer was developed using a polysulfite oligomer derived from the copolymerization of SO2 and propylene oxide (PO) as the soft segments (SSs). It was found that increasing the hard segment (HS) content improved tensile strength but reduced stretchability when the SS molecular weight was constant. On the other hand, both tensile strength and stretchability decreased with increasing SS molecular weight when the HS content was constant. The SO2-based TPU elastomers exhibited superior mechanical properties compared to poly(propylene oxide)-based TPU elastomers obtained via the same method, making it an attractive option for utilizing SO2.
Article
Polymer Science
Tao Zhang, Seung-Jun Lee, Yong Hwan Yoo, Kyu-Hwan Park, Ho-Jong Kang
Summary: ETPU beads were prepared using a supercritical CO2 foaming process and compression molded into foam sheets. The cell structure of the foamed beads influenced the properties of the foam sheets. By controlling the pressure and temperature, the properties of the ETPU foam sheets, including foam resilience, hardness, tensile strength, and elongation, could be adjusted.
Article
Materials Science, Multidisciplinary
Auezhan Amanov, Stephen P. Berkebile
Summary: This study evaluates the effects of ultrasonic nanocrystal surface modification (UNSM) on the tribological behavior of WC-Co thermal spray coatings for fuel-lubricated components. The results show that UNSM reduces surface roughness, increases hardness, refines grain size, and introduces compressive residual stress. Under fuel lubrication, UNSM significantly reduces the coefficient of friction and specific wear rate.
Review
Engineering, Mechanical
Zhongliang Xie, Jian Jiao, Kang Yang, Hao Zhang
Summary: This paper provides a detailed summary of water-lubricated bearings in five typical aspects: lubrication regime, fluid-solid interaction (FSI), thermal effect, tribological behaviors, and vibration-noise performances. It extracts and acquires the influencing factors, judgement criteria, and lubrication mechanism of the lubrication regime. The methodology and parameters influencing temperature rise are summarized. The generation mechanism of tribological behaviors and vibration & noise is obtained. The paper systematically combs and summarizes the theories and methods of water-lubricated bearings, pointing out the existing problems and urgent technologies that need to be solved. The findings can serve as a distinct theoretical and methodological reference for further investigation on water-lubricated bearings.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Shifan Li, Conglin Dong, Chengqing Yuan, Xiuqin Bai
Summary: Water-lubricated bearings are crucial for improving the efficiency and eco-friendliness of ships. However, the weak load-bearing capacity of the water film often leads to boundary-lubricated or dry friction conditions during start-stop and steering, posing challenges for the ship's operation. This study investigates the tribological behaviors and frictional vibrations of a UHMWPE matrix reinforced with TiO2 nanoparticles, aiming to design marine water-lubricated bearing materials with excellent wear-resistance and vibration-reduction properties.
