Article
Engineering, Aerospace
N. Cherkashina, V. Pavlenko, V. M. Abrosimov, V. M. Gavrish, V. Trofimov, S. Budnik, R. S. Churyukin
Summary: The study shows that fast electron irradiation has different effects on the properties of polyimide and polyimide/tungsten oxide composites. Polyimide surface roughness increases, microhardness increases, and dielectric constant decreases after irradiation at the maximum dose, while the properties of the polyimide/tungsten oxide composite remain relatively stable.
Article
Engineering, Mechanical
Huimin Qi, Ga Zhang, Zhiqin Zheng, Jiaxin Yu, Chao Hu
Summary: The study found that the inclusion of different reinforcing fillers in PI composites can have an impact on frictional properties and tribofilm formation. AP-reinforced PI composites showed viscous tribofilms and higher friction and wear, while SCF-reinforced PI composites exhibited higher load-carrying capacity and lower friction and wear.
Article
Chemistry, Physical
Xiao Sun, Yongjian Liu, Ning Luo, Ying Liu, Yange Feng, Shougang Chen, Daoai Wang
Summary: Surface charge density greatly influences triboelectric properties and tribological behavior. This study used plasma irradiation-based surface treatment to enhance triboelectric properties and optimize tribological behavior of polyimide (PI) films. The generation of granular nanostructures on the PI film surface enhanced effective contact area and electron affinity. By controlling irradiation time, fully antistatic PI surface was obtained. The elimination of surface charge and regulation of coefficient of friction improved the material's friction stability and wear resistance.
Article
Engineering, Mechanical
Enzhu Hu, Enhao Su, Ayush Subedi, Shusheng Liu, Jianping Wang, Hua Zhong, Kunhong Hu
Summary: This paper prepared carbon quantum dots (CQDs) using citric acid and fabricated a new CQDs/polyimide composites (CQDs/PI) coating. The coating showed improved anti-wear and friction reduction properties, which were attributed to the enhanced hardness of the polyimide coatings by the CQDs and the formation of a transfer film on the surface of the ceramic balls during the friction process, reducing direct contact at the friction sub-interface.
Article
Engineering, Mechanical
Liangfei Wu, Zhaozhu Zhang, Mingming Yang, Junya Yuan, Peilong Li, Zujun Chen, Xuehu Men
Summary: In this study, polyimide powders are engineered through the assistance of polydopamine in aqueous solutions, leading to the transformation from hydrophobic to hydrophilic properties and enabling further modification. The use of polydopamine allows for the homogeneous dispersion of multi-walled carbon nanotubes in the polymer matrix, while also successfully loading Cu2+ onto the surfaces of the polymer powders, which converts to metallic copper during the hot pressing process. These modifications present multi-profit and practical application prospects for polymer composites.
Article
Engineering, Mechanical
Yang Lei, Liping Zhang, Liang Zhou, Jiaxin Yu, Gai Zhao, Lihe Guo, Ding Zhang, Huimin Qi
Summary: This study explored the effects of proton irradiation on the tribological performance of polyimide composites filled with carbon nanotubes. The results showed that incorporating carbon nanotubes into polyimide reduced the friction coefficients of the composites after proton irradiation. Further analysis revealed that polymers and hydrogenated amorphous carbon in the composites promoted the growth of a protective tribofilm and improved the lubrication properties. However, the mechanical changes induced by proton radiation resulted in poor wear resistance of the polyimide composites.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
Yinan Liu, Feng Chen, Xiaohui Ni, Xinghua Xia
Summary: This study explores the method of decorating wood fiber/polypropylene (WF/PP) composites with wood veneer, and finds that it can improve the surface bonding strength and mechanical strength of the composite material.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Coatings & Films
Zsolt F. Kovacs, Zsolt J. Viharos, Janos Kodacsy
Summary: The magnetic assisted ball burnishing is a new machining method that can reduce frictional resistance and create advantageous oil pockets on the machined surface.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Textiles
N. Rajini, K. Mayandi, Manoj M. Prabhakar, Suchart Siengchin, Nadir Ayrilmis, C. Bennet, S. O. Ismail
Summary: This study investigated the tribological behavior of natural fiber-reinforced polyester composites using CP fiber and polyester as materials. The composites were fabricated and tested for wear performance, showing an increase in specific wear rate with higher loads and a non-linear decrease in friction coefficient with increasing contact pressure and decreasing sliding velocity. Morphological analysis was conducted using a scanning electron microscope on the worn specimens.
JOURNAL OF NATURAL FIBERS
(2021)
Article
Automation & Control Systems
Rashid Ali Laghari, Ning He, Muhammad Jamil, Munish Kumar Gupta
Summary: The use of MQL and CO2 in wet machining improves the machinability of SiCp/Al materials, reducing cutting forces, improving surface quality, and prolonging tool life.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Mechanical
M. Erkin Cura, Michal Trebala, Yanling Ge, Piotr Klimczyk, Simo-Pekka Hannula
Summary: Oxygen vacancies in WO2.9 create easy shear planes, which can reduce friction in boundary lubrication conditions. The study found that the composite n-ZrO2 + 10 vol% WO2.9 had the lowest coefficient of friction and wear rate, thanks to WO2.9 acting as a solid lubricant.
Article
Polymer Science
Bayram Poyraz, Huseyin Unal, Mustafa Dayi
Summary: This experimental study investigated the effects of mesoporous silica filler content on the properties of polyimide composites. The addition of mesoporous silica led to decreased thermal stability, pore size, and pore volume, as well as reduced coefficient of friction and specific wear rate. Both neat polyimide and polyimide-Si composites exhibited abrasive wear behaviors, suggesting that mesoporous dimensions and Si content influenced the properties of the polyimide material.
JOURNAL OF POLYMER ENGINEERING
(2022)
Article
Engineering, Mechanical
Na Tyrer, Fan Yang, Gary Barber, Bo Pang, Bingxu Wang
Summary: With the rapid growth in the use of electronics, more studies are focusing on the tribological performance of electrical connectors. This research aims to reduce metal oxidation of electrical connectors by studying the tribological performance of various thicknesses of tin and copper layers with a designated electrical circuit to be used with a reciprocating wear test.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Mechanical
Jiaxing Wu, Jianxin Deng, Ying Meng, Shijie Wang, Ran Wang, Xuemu Li, Wei Sun
Summary: The research focused on improving the dry friction and wear performance of aluminum alloys through a combination of texturing pretreatments and lubricant films. The study showed that the sample with 100μm spacing texture and PTFE/PPS film exhibited the best anti-wear effect during dry reciprocating sliding, increasing wear life by 10% and reducing wear track width and adhesion width by 35% and 25%, respectively.
Article
Optics
Junyuan Huang
Summary: The use of laser processing technology to construct textures on 35CrMo can effectively reduce the friction coefficient between parts and extend the service life. Research has shown that the decrease in friction coefficient is caused by the increase in surface roughness.
