Article
Materials Science, Multidisciplinary
Hai Wang, Xiaowen Qi, Lifen Liang, Yongfu Wang, Junyan Zhang, Xiangbo Meng
Summary: The tribological properties of self-lubricating polymer were improved by enhancing the properties of the transfer film through the use of graphene oxide (GO) reinforced polytetrafluoroethylene (PTFE)/poly-p-phenylene terephthamide (PPTA) composites (GPPs) prepared by dual-size synthesis. The tribological properties of GPPs were investigated using a ball-on-disk tribometer, revealing low friction coefficient (minimum = 0.061) and high hydrophobicity (maximum = 137.1385 degrees). The study elucidated the structure-property relationships and practical effect of transfer film enhancement induced by GO, aiming to provide guidance for the design of GO reinforced self-lubricating polymers.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Textiles
Saeed Reza Zahabi, Mohammad Sheikhzadeh, Saleh Akbarzadeh, RamazanAli Abuzade, Frank Ko
Summary: In this study, a hybrid PTFE/glass fiber braided structure was used as composite reinforcement, and composites were prepared through vacuum assisted resin transfer molding process. The tribological experiments showed self-lubricating and low friction coefficient due to PTFE transfer film formation, with friction coefficients of 0.112, 0.105, and 0.096 obtained under loading forces of 20, 30, and 40 N, respectively.
JOURNAL OF INDUSTRIAL TEXTILES
(2022)
Article
Materials Science, Multidisciplinary
Juan Wang, Xiongrong Huang, Wei Wang, Haosheng Han, Hongyu Duan, Senlong Yu, Meifang Zhu
Summary: In this study, the surface modification of PTFE/aramid fabric composites was performed to improve their friction stability in long-term friction. The results showed that the PTFE composite coating enhanced the wear resistance and friction stability of the composites, especially under high sliding speed.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Materials Science, Characterization & Testing
Zhicheng Zhao, Yanjun Ma, Hongqi Wan, Yinping Ye, Lei Chen, Huidi Zhou, Jianmin Chen
Summary: CeO2 nanoparticles prepared by in-situ synthesis were used to strengthen PAI/PTFE lubricating coatings, showing good dispersion and narrow particle size range. The addition of CeO2 nanoparticles effectively promoted the micro-hardness and wear resistance of the coatings, with 5 wt% CeO2 nanoparticles filling exhibiting superior performance.
Article
Engineering, Mechanical
Jinshan He, Limin Ma, Yawen Yang, Weihong Jia, Qi Zhou, Shengrong Yang, Jinqing Wang
Summary: In this study, a hybrid additive system consisting of soluble starch (SS) and physically modified fluorinated graphene (FG) was designed to meet the future demand for water-based lubrication. The modified FG nanosheets with amphiphilicity were obtained through high-speed shear exfoliation, significantly improving the load-bearing and boundary lubrication performances of the water-based lubricant. SS further enhanced the friction-reduction and boundary film formation performances, especially during the running-in period. At the best ratio, the hybrid lubricant synergistically reduced the friction coefficient and wear rate by around 90%.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Yawen Yang, Honggang Wang, Junfang Ren, Gui Gao, Gengrui Zhao, Shengsheng Chen, Na Wang, Jinqing Wang
Summary: The tribological studies showed that the PTFE@PR composite maintained excellent tribological properties under harsh working conditions and exhibited long durability, making it a potential candidate lubricating material with multi-environmental adaptability.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Environmental
Zhangpeng Li, Jinqing Wang, Yawen Yang, Jinyu Zhu, Kaiming Hou, Limin Ma, Weihong Jia, Honggang Wang, Shengrong Yang
Summary: This work presents a simple and versatile strategy to construct organic/inorganic bi-layer coating with excellent lubricating properties and long service life. The PTFE/Al3+MXene coating was fabricated using a two-step strategy, and its molecular interaction and mechanical properties were enhanced through self-assembly and in-situ transfer of PTFE. The research demonstrates that the PTFE/Al3+MXene coating with a specific pre-friction time has the best service life among the prepared coatings, and facilitates the formation of a secondary transfer film, extending the wear-resisting life.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Mechanical
Wei Feng, Lei Yin, Yanfeng Han, Jiaxu Wang, Ke Xiao, Junyang Li
Summary: This study experimentally investigated the tribological properties of adding PTFE particles to NBR water-lubricated bearing materials under water lubrication conditions. The results showed that the PTFE particles can form a lubricating film, enhancing load capacity and lubrication performance.
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Diego Salvaro, Joao Marcos Warmling Dudy, Fabiana de Oliveira Palheta, Cristiano Binder, Aloisio Nelmo Klein, Guilherme Mariz de Oliveira Barra, Jose Daniel Biasoli de Mello
Summary: Improving the energy efficiency of mechanical systems and reducing the usage of lubricant oils and related additives are challenging tasks of the 21st century. The application of tribopolymers, such as PEEK, PAEK, and PTFE, is increasing due to their easy processing and lower density. This study investigates the effects of grinding processes and the incorporation of PTFE on the morphology, composition, and tribological properties of PAEK + PTFE blends.
Article
Chemistry, Applied
Zhengchao Xi, Hongqi Wan, Yanjun Ma, Yanping Wu, Lei Chen, Hongxuan Li, Huidi Zhou, Jianmin Chen, Guoliang Hou
Summary: The in-situ synthesis of Cu2S nanoparticles in solid lubricating coatings significantly improved their mechanical properties and wear resistance, especially exhibiting excellent anti-wear ability under an applied load of 10 N and sliding frequency of 7 Hz.
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Chemistry, Applied
Yanjun Ma, Yue Zhang, Hongqi Wan, Yinping Ye, Yanping Wu, Lei Chen, Huidi Zhou, Jianmin Chen
Summary: In this study, Ag2S quantum dots with high dispersibility were synthesized and their interaction with polyamide-imide molecules was investigated. The optimization of mechanical and tribological properties of lubricating coatings was achieved by improving the interfacial interaction. The results showed that the addition of Ag2S quantum dots enhanced the hardness and wear life of the coatings and promoted the formation of carbon-based tribofilm.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Engineering, Mechanical
Elin Larsson, Rene Westbroek, Johan Leckner, Staffan Jacobson, Asa Kassman Rudolphi
Summary: The type of thickener has a significant impact on wear and tribofilm formation, with polypropylene thickener showing more wear in steel contacts. Graphite, graphene oxide, and reduced graphene oxide additives did not have a significant effect on friction and wear in the grease.
Article
Engineering, Mechanical
Xiao Kang, Shuang Yu, Hailin Yang, Yang Sun, Lei Zhang
Summary: The study aimed to fabricate a nanocomposite with low friction and high wear resistance using binary solid lubricant particles. The composition and film thickness of the lubricating film were observed and analyzed, revealing improved tribological properties such as low friction coefficient and wear rate in high-purity nitrogen atmosphere. MoS2 was found to be more effective than WS2 in forming a transfer layer during the tribological process.
Article
Chemistry, Multidisciplinary
Junhai Wang, Weipeng Zhuang, Tingting Yan, Wenfeng Liang, Ting Li, Lixiu Zhang, Xiaoyi Wei
Summary: The study synthesized Cu(ReO4)(2)/Gr composite as a lubricant additive, showing significant improvement in friction performance of the base oil at room temperature, with graphene accelerating friction-induced heat transfer to reduce friction and wear.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Yahong Xue, Xinbo Tao, Dongzhuang Kang, Shicheng Yan
Summary: By investigating the influence of sliding orientation, it was found that composite-90 degrees (sliding along Kevlar fibers) has the best friction and wear properties under loads of 50 N and 100 N, while composite-0 degrees (sliding along PTFE fibers) exhibits the best tribological properties when the load increases to 200 N. The friction coefficient decreases during the stable wear stage due to the formation of a PTFE transfer film. The contact geometry generated by the interlacing fibers as well as sliding direction continue to dominate the tribological properties under a light load, while a suitable heavy load and sliding along the PTFE fiber contribute to the formation of a stable and continuous transfer film of debris, resulting in the lowest friction coefficient of 0.105 and the lowest wear depth of 0.056 mm for composite-0 degrees under 200 N.
Article
Engineering, Mechanical
Busra Duran, Jerome Cavoret, David Philippon, Fabrice Ville, Arnaud Ruellan, Frank Berens
Summary: This study analyzes the changes in the physicochemical properties and tribological performances of gear transmission oils during field operation, finding differences from traditional engine oils.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Baocheng Liu, Hongsheng Chen, Jun Zhou, Jing Wang, Wenxian Wang, Xiaochun Chen, Sanxiao Xi
Summary: This study used fast hot pressing sintering to fabricate WC/AlCoCrFeNi2.1 metal matrix composites (MMCs). It was found that the addition of reinforced particles increased the microhardness, nanoindentation and wear resistance of the MMCs. During frictional processes, an oxide film formed, providing material protection, enhancing stability and reducing friction-induced losses.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Pradip Kumar Verma, Alok Singh
Summary: This study investigates the mechanical properties and wear resistance of CoMoMnNiV high entropy alloy reinforced aluminium matrix composite processed through stir-squeeze casting assisted with an ultrasonic transducer. The results show significant improvements in mechanical properties and wear resistance, with the composite containing 8 wt% HEA demonstrating the highest resistance to wear. Optical microscopy, SEM, and an optical profilometer were used for a thorough examination of the microstructure and worn surface.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Zhenghai Yang, Yingjian Song, Jinlong Jiao, Wenbo Li, Bao Shangguan, Yongzhen Zhang
Summary: This study investigated the friction, wear properties, and current-carrying properties of copper-graphite composites paired with brass C28000. The results showed that the current-carrying properties of the composite materials were excellent, but their wear rate was the main limiting factor. Furthermore, an increase in the thickness of the graphite layer led to an improvement in the uniformity of damage.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Moustafa Mahmoud Yousry Zaghloul, Karen Steel, Martin Veidt, Michael T. Heitzmann
Summary: This research evaluates and compares the impact of different material types on the tribological characteristics of Polyamide 6 composites, and finds that glass fiber-reinforced Polyamide 6 exhibits better friction and wear performance under high-pressure velocity factors.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Shaoqing Qin, Lida Zhu
Summary: In this paper, the surface and subsurface damage of laser assisted grinding CrCoNi medium entropy alloys were investigated using molecular dynamics simulations. The results showed that the application of laser energy can reduce cutting forces and minimize subsurface damage.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Kaikui Zheng, Youxi Lin, Tingzheng Lai, Chenghui Gao, Ming Liu, Zhiying Ren
Summary: The study investigated the use of waste foundry resin-bonded sand as a substitute for copper in resin-based brake material. It found that the waste sand was more favorable for improving the overall friction and wear properties of the material compared to copper. Waste sand benefited the material by forming a friction layer, leading to increased friction coefficient and stability. Brake material with 10-15% waste sand showed excellent heat-fade resistance.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Dayang Li, Fanhao Zhou, Yutong Gao, Kun Yang, Huimin Gao
Summary: This article introduces a continuous prediction model based on deep learning for predicting the power output of steam turbines. The model uses long short term memory (LSTM) method to develop a trend prediction model and optimizes the prediction model through feature selection method. Experimental results show that the model outperforms other models in terms of prediction performance.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Tomohiro Toyoda, Ryo Yasuike, Toshihiro Noda
Summary: In this study, a elasto-plastic constitutive model of friction incorporating the concept of superloading surface was developed based on the subloading friction model. The proposed model achieves a smooth transition of friction by describing the evolution rule of structure, treating the state with static friction coefficient larger than kinetic friction coefficient as the bulkiness of structure. The positive definiteness of the plastic multiplier, loading condition, and material parameters were derived, and the validity of the proposed model in accordance with the subloading-friction model was confirmed through a stick-slip simulation of a mass-spring system.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
P. Balaji, B. Surya Rajan, K. Sathickbasha, P. Baskara Sethupathi, Deviga Magadevan
Summary: This study emphasizes the importance of using a variety of solid lubricants with different oxidation temperature regimes to enhance the tribological performance of brake pads.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Jian Ma, Yancong Liu, Javad Mostaghimi, Na Zhang
Summary: This paper investigates the influence of preparation strategies on the lubrication properties of surface textures. Three laser scanning strategies are proposed to achieve a sinusoidal textured surface, and the evolution of surface structure and chemical composition is discussed. The findings show that ridge structures enhance anti-wear properties but also increase the friction coefficient. However, the oil cover preparation method prevents the formation of ridges and improves wettability.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Mohammad Roostaei, Arvin Taghizadeh Tabrizi, Hossein Aghajani
Summary: In this research, the Al2O3/MoS2 nanocomposite coating layer was successfully applied on the surface of Ti-6Al-4 V alloy. The relation between the surface characteristics and wear resistance of the coating was studied using atomic force microscopy analysis and pin-on-disk wear test method. The results showed that the nanocomposite coating significantly reduced the wear rate and provided an equation to calculate the Lancaster coefficient.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Musa Bilgin, Sener Karabulut, Halil Karakoc, Yunus Kayir, Murat Sarikaya
Summary: This study investigates various methods to improve the machinability efficiency of Inconel 718 alloy while considering their effect on microstructural properties. The results show that hot+PMQL, hot+SiCNMQL, and hot+Al2O3-NMQL contribute significantly to the improvement of machinability characteristics. The EBSD analysis also reveals that a limited area is affected by heat in the hot machining environment and that the removal of the heated layer during milling process helps preserve the microstructure.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Q. Gao, Y. Fan, Y. G. Wu, J. L. Liu, J. Wang, L. Li
Summary: Fretting wear significantly affects the hysteresis behavior of the contact surface and leads to joint degradation. This study investigates the influence of harmonic normal force on the evolution of interface morphology and contact parameters with fretting wear. The results show that the harmonic normal force can significantly influence the hysteresis loop and the energy dissipation distribution on the contact surface.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Benjamin Weiland, Floriane Leclinche, Anis Kaci, Brigitte Camillieri, Betty Lemaire-Semail, Marie -Ange Bueno
Summary: This study presents a systematic approach to generating control signals for a tactile simulator that simulate the touch of textile fabrics. By using a friction modulation tactile surface and acquiring forces from real surfaces with artificial finger mimicking fingerprints, control signals are generated and processed in the frequency domain before sending them to the tactile stimulator. The study focuses on the potential benefits of incorporating fingerprint information in fabric simulations to achieve a more realistic tactile perception. A sensory analysis with 36 participants using the generated control signals showed better discrimination without fingerprint information.
TRIBOLOGY INTERNATIONAL
(2024)