Friction最新文献_第6页

The effects of popcorn-like CeO2 decorated Cr2AlC hybrid on the tribological properties of CF/PTFE fabric composites 爆米花状CeO2修饰Cr2AlC杂化物对CF/PTFE织物复合材料摩擦学性能的影响

IF 6.8 1区工程技术

Friction Pub Date : 2025-04-21 DOI: 10.26599/frict.2025.9441117

Yue Zhang, Mingming Yang, Zhaozhu Zhang, Yaohui He, Chaoying Liao, Hao Chen, Junya Yuan, Fanjie Chu, Xiongrong Huang

{"title":"The effects of popcorn-like CeO2 decorated Cr2AlC hybrid on the tribological properties of CF/PTFE fabric composites","authors":"Yue Zhang, Mingming Yang, Zhaozhu Zhang, Yaohui He, Chaoying Liao, Hao Chen, Junya Yuan, Fanjie Chu, Xiongrong Huang","doi":"10.26599/frict.2025.9441117","DOIUrl":"https://doi.org/10.26599/frict.2025.9441117","url":null,"abstract":"In this study, Cerium oxide (CeO2) nanoflowers were uniformly grown on the surface of chromium aluminum carbide (Cr2AlC) particles via a simple and efficient co-precipitation approach, which resulted in the preparation of the hybrids referred to as Cr2AlC@CeO2. The CeO2 nanoparticles exhibited a capacity to alternate between the oxidation states of Ce3+ and Ce4+ under stress, forming a protective layer to repair damaged surfaces and reduce friction and wear at the nanoscale. The Cr2AlC@CeO2 hybrids were utilized to enhance the tribological performance of carbon fiber (CF) and polytetrafluoroethylene fiber (PTFE) blended fabrics (CF/PTFE fabric) phenolic composites, and the friction test indicated that when the filler content reached 4.0 wt%, the wear rate of the fabric composites was 2.79×10-14 m3 (N·m)-1, which was 59% lower than that of the pure composites, and the coefficient of friction was decreased by 39%. This enhancement was attributed to the formation of an adaptive tribofilm with a thickness ranging from 85 nm to 113 nm on the corresponding surface. The analysis of the worn surface and the tribofilm revealed a synergistic enhancement effect of Cr2AlC and CeO2. The Cr2AlC@CeO2 reinforced fabric composites (Cr2AlC@CeO2/fabric composites) exhibited the best wear resistance due to the superior load-bearing capacity of Cr2AlC and the outstanding lubricating properties of CeO2.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"5 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143853698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Active control of finger sliding friction with different surface roughness in SDS solutions for underwater surface haptics 水下表面触觉SDS溶液中不同表面粗糙度手指滑动摩擦的主动控制

IF 6.8 1区工程技术

Friction Pub Date : 2025-04-21 DOI: 10.26599/frict.2025.9441116

Xue Zhou, Zhonghuan Xiang, Pengpeng Bai, Hui Cao, Shicai Zhu, Yonggang Meng, Yu Tian

引用次数: 0

Ultrasonic-induced thickening and lubrication properties of h-BN nanosheets regulated by diurea modification 双脲改性对h-BN纳米片超声增稠及润滑性能的影响

IF 6.8 1区工程技术

Friction Pub Date : 2025-04-21 DOI: 10.26599/frict.2025.9441118

Jiating Fu, Xinshao Cheng, Qi Ding, Peng Ding, Wenhui Cao, Litian Hu

{"title":"Ultrasonic-induced thickening and lubrication properties of h-BN nanosheets regulated by diurea modification","authors":"Jiating Fu, Xinshao Cheng, Qi Ding, Peng Ding, Wenhui Cao, Litian Hu","doi":"10.26599/frict.2025.9441118","DOIUrl":"https://doi.org/10.26599/frict.2025.9441118","url":null,"abstract":"Hexagonal boron nitride (h-BN) nanosheets are widely used as key additives to enhance the performance of lubricants under harsh working conditions due to their excellent high-temperature resistance, good chemical stability, and layered structure similar to graphene. Recently, it has been found that diurea modification can endow h-BN nanosheets with unique ultrasonic-induced thickening properties, enabling their use in the formulation of ultrasonic-responsive nanogel lubricants. However, the mechanism of diureas in regulating the thickening properties and lubrication performance of h-BN nanosheets is still not well elucidated. Therefore, in this paper, h-BN nanosheets were modified with three diureas with straight-chain structures, and the effects of chain-length on the ultrasonic-induced thickening capabilities and lubricating properties in polyalphaolefin 8 (PAO8) were investigated. It was found that the thickening capabilities of modified h-BN nanosheets mainly depended on the interaction between the diureas and PAO8. Tribological tests showed that the nanogel formed by the modified h-BN nanosheets under sonication exhibited better lubrication performance than PAO8 under startup, varying speeds, and heavy load conditions. The high fluidity and high h-BN content were found to be essential for attaining optimized lubrication performance of h-BN nanogels.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"34 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143853696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on deuterium–deuterium thermonuclear fusion with interface confinement 界面约束下氘-氘热核聚变的实验研究

IF 6.8 1区工程技术

Friction Pub Date : 2025-04-18 DOI: 10.26599/frict.2025.9441083

Darong Chen, Liang Jiang, Shuai Chen, Bao Wang, Dangguo Li, Peng Liang

{"title":"Experimental study on deuterium–deuterium thermonuclear fusion with interface confinement","authors":"Darong Chen, Liang Jiang, Shuai Chen, Bao Wang, Dangguo Li, Peng Liang","doi":"10.26599/frict.2025.9441083","DOIUrl":"https://doi.org/10.26599/frict.2025.9441083","url":null,"abstract":"Nuclear fusion is recognized as the energy of the future, and considerable effort and capital have been put into the research of controlled nuclear fusion in the past decades. The most challenging thing for controlled nuclear fusion is to generate and maintain a super high temperature. Here, a sonication system combined with micro-scale fluid control techniques was built to generate cavitation within a limited region. As bubbles were rapidly compressed, the high-temperature plasma generated inside led to particle emissions, where a Cs2LiYCl6:Ce3+ (CLYC) scintillator is used to collect the emission events. The pulse shape discrimination methods applied to the captured signals revealed that only gamma ray events were observed under sonication with normal water, while obvious separation of neutron and gamma ray events was surprisingly identified under sonication with deuterated water. This result suggested that neutrons were emitted from the sonicated deuterated water, i.e., deuterium–deuterium thermonuclear fusion was initiated. This study provides an alternative and feasible approach to achieve controllable nuclear fusion and makes great sense for future studies on the application of fusion energy.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"58 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrasonic measurement for surface damage monitoring in coated bearing shells 涂层轴承壳表面损伤监测的超声测量

IF 6.8 1区工程技术

Friction Pub Date : 2025-04-18 DOI: 10.26599/frict.2025.9441065

Liqun Wu, Ion Palamarciuc, Rizwan Bajwa, Yi Zhang, Rob Dwyer-Joyce

引用次数: 0

Environmental limitations of PTFE for ultralow friction composites and alternatives to using liquid lubricants 用于超低摩擦复合材料的聚四氟乙烯的环境限制以及使用液体润滑剂的替代品

IF 6.8 1区工程技术

Friction Pub Date : 2025-04-14 DOI: 10.26599/frict.2025.9441022

Yuri Park, Si-Geun Choi, Chan-Hyun Cho, Jong-Hyoung Kim, Jin-Young Park, Myoung-Hwan Park

{"title":"Environmental limitations of PTFE for ultralow friction composites and alternatives to using liquid lubricants","authors":"Yuri Park, Si-Geun Choi, Chan-Hyun Cho, Jong-Hyoung Kim, Jin-Young Park, Myoung-Hwan Park","doi":"10.26599/frict.2025.9441022","DOIUrl":"https://doi.org/10.26599/frict.2025.9441022","url":null,"abstract":"The importance of reducing energy-related environmental and economic issues by extending the lifetime and efficiency of mechanical systems has increased. The use of ultralow friction composite materials is one approach to eliminate frictional wear. Polytetrafluoroethylene (PTFE) has excellent low friction properties and has been used to reduce frictional wear in various industrial fields. However, degradation of PTFE in natural environments poses challenges owing to its stable chemical structure, which is characterized by strong C‒F bonds. Furthermore, PTFE can accumulate in the living body and environment over a long period of time. Consequently, it is resistant to physiological filtration or decomposition. Hence, it is sometimes called a “forever chemical”. Therefore, PTFE, which is a type of poly- and perfluoroalkyl substance (PFAS), is increasingly being adopted as a regulated substance. This review focuses on several aspects of PTFE and PFAS, reasons for their adoption as regulated chemicals, and research on alternatives to PTFE, particularly the use of liquid lubricants.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"120 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143827212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Oxygen-induced contact evolution enables friction reduction in MoS2/Ag composite films 氧气诱导的接触演化可降低 MoS2/Ag 复合薄膜的摩擦力

IF 6.8 1区工程技术

Friction Pub Date : 2025-04-09 DOI: 10.26599/frict.2025.9441108

Xiaoyan Ma, Qing Gao, Zhenrong Gao, Xin Fan, Min Yang, Shunhua Wang, Siming Ren, Jibin Pu

{"title":"Oxygen-induced contact evolution enables friction reduction in MoS2/Ag composite films","authors":"Xiaoyan Ma, Qing Gao, Zhenrong Gao, Xin Fan, Min Yang, Shunhua Wang, Siming Ren, Jibin Pu","doi":"10.26599/frict.2025.9441108","DOIUrl":"https://doi.org/10.26599/frict.2025.9441108","url":null,"abstract":"Molybdenum disulfide (MoS2) is widely utilized as a lubricant in aerospace, machinery, and electronics due to its unique layered structure and interlayer slip characteristics. Understanding the tribological behaviors of MoS2-based films under varying atmospheric conditions, including oxidizing and specialized atmospheres, is crucial for developing environmentally adaptive lubricants. Here, we fabricated pure MoS2 and Ag-doped MoS2/Ag composite films via magnetron sputtering, focusing on their tribological performance in argon, CO2 and O2 atmospheres. Our results demonstrate that the friction coefficients of both films in argon and CO2 are comparable to those in vacuum, with these environments promoting the formation of a continuous tribofilm on the counterpart ball surface, thereby reducing wear rates. Remarkably, in an oxygen environment, the MoS2/Ag composite film exhibits a ~50% reduction in the friction coefficient (0.027) and a threefold decrease in wear rate compared to vacuum conditions. This exceptional performance is attributed to the friction-induced metal oxide nanoparticles coated with Ag, forming a “brick-mud” structure that slides with MoS2 (002) nanosheets to achieve low friction and wear. Furthermore, the addition of Ag enhances the film’s ability to repair sliding interfaces, mitigating abrasive wear. Our study elucidates the mechanisms driving the low-friction behavior of MoS2-based films in atmospheric environments, offering valuable insights for the development of high-performance lubricants for extreme conditions.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"18 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of contact path on lubricant distribution and EHL film formation 接触路径对润滑油分布和EHL膜形成的影响

IF 6.8 1区工程技术

Friction Pub Date : 2025-04-09 DOI: 10.26599/frict.2025.9441026

Xuyang Jin, Xinming Li, Linqing Bai, He Chong, Feng Guo, Gerhard Poll, Yongqiang Fu

{"title":"Effects of contact path on lubricant distribution and EHL film formation","authors":"Xuyang Jin, Xinming Li, Linqing Bai, He Chong, Feng Guo, Gerhard Poll, Yongqiang Fu","doi":"10.26599/frict.2025.9441026","DOIUrl":"https://doi.org/10.26599/frict.2025.9441026","url":null,"abstract":"The dynamic motion of the rolling elements in rolling bearings leads to variations in the contact paths. The displacement of the rolling tracks and the contact width between adjacent rolling elements redistribute the lubricant, consequently influencing film formation. To reproduce this process, an auxiliary ball is introduced into the conventional ball-on-disc test device. By adjusting the positions and loading conditions of the auxiliary balls, the influences of the offset distance (L) and contact width on lubricant redistribution and film formation can be experimentally observed. The results demonstrate that as L increases, both the inlet lubricant supply and the lubrication state improve. At high loads, the auxiliary ball generates a wider rolling track, resulting in a decrease in film thickness due to inadequate inlet lubricant supply. Furthermore, numerical simulations were conducted to validate these observations. The results confirm that dynamic ball motion significantly influences lubricant redistribution and plays a vital role in determining film thickness. The underlying mechanisms were analyzed and elucidated. The findings provide valuable insights into the lubrication behavior of rolling bearings induced by the dynamic motion of rolling elements.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"108 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Calcium ions combining epigallocatechin 3-gallate to enhance saliva lubrication 钙离子结合表没食子儿茶素3-没食子酸酯增强唾液润滑

IF 6.8 1区工程技术

Friction Pub Date : 2025-04-09 DOI: 10.26599/frict.2025.9441109

Yue Tang, Lei Lei, You Zhou, Yulong Zhou, Jing Zheng, Zhongrong Zhou

{"title":"Calcium ions combining epigallocatechin 3-gallate to enhance saliva lubrication","authors":"Yue Tang, Lei Lei, You Zhou, Yulong Zhou, Jing Zheng, Zhongrong Zhou","doi":"10.26599/frict.2025.9441109","DOIUrl":"https://doi.org/10.26599/frict.2025.9441109","url":null,"abstract":"This in vitro study investigated the effect of combination of calcium ions (Ca2+) with epigallocatechin 3-gallate (EGCG) on the adsorption and lubrication of salivary proteins as well as the bacterial growth in saliva, aiming to explore a feasible approach to enhance saliva lubrication for xerostomia treatment. The adsorption and lubrication behavior of salivary proteins were examined using atomic force microscope, quartz-crystal microbalance with dissipation and nano-indentation/scratch techniques, and the Streptococcus mutans activity in saliva was evaluated by using flat colony counting method. Results showed that although improving the adsorption and lubrication of salivary proteins, extra addition of Ca2+ in saliva causes flagrant bacterial proliferation. The lubrication benefits of adding 6 mM Ca2+ outweigh the risks of bacterial growth, while a concomitant addition of EGCG in saliva at concentrations of ≥ 0.046 mM inhibits the resulting bacterial proliferation. Nevertheless, introduction of EGCG into saliva has the potential to coarsen salivary pellicles and affect oral perception, and an applicable concentration range for the EGCG in combination with 6 mM Ca2+ was found to be 0.046 mM to 0.08 mM. Moreover, Ca2+ combining EGCG contributes to an increase in the lubricity of the two-layered salivary pellicles obtained from selective physisorption of salivary proteins through a mechanism that induces salivary protein aggregation and then increases the thickness, viscoelasticity, and energy dissipation of the outer pellicle layer. Consequently, the combination of Ca2+ with sub-perceptual EGCG has an encouraging tribological role in saliva lubrication, demonstrating great promise for xerostomia treatment.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"2 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bio-inspired ceramic scaffold reinforced PTFE composites achieving near-zero wear and self-lubrication under extreme conditions 仿生陶瓷支架增强PTFE复合材料在极端条件下实现近零磨损和自润滑

IF 6.8 1区工程技术

Friction Pub Date : 2025-04-09 DOI: 10.26599/frict.2025.9441110

Lei Lei, Qian Cao, Yuchi Wu, Mintang Liu, Jing Zheng, Yuanyuan Mei, Zhongrong Zhou

{"title":"Bio-inspired ceramic scaffold reinforced PTFE composites achieving near-zero wear and self-lubrication under extreme conditions","authors":"Lei Lei, Qian Cao, Yuchi Wu, Mintang Liu, Jing Zheng, Yuanyuan Mei, Zhongrong Zhou","doi":"10.26599/frict.2025.9441110","DOIUrl":"https://doi.org/10.26599/frict.2025.9441110","url":null,"abstract":"The development of high-performance polytetrafluoroethylene (PTFE) composites with excellent wear resistance and self-lubrication under heavy-load and high-speed conditions is urgently required for advanced tribological applications in many fields including aviation and aerospace, but remains a challenge. Human enamel, a natural composite capable of enduring millions of chewing cycles under pressures up to ~2.5 GPa, serves as an ideal model for advanced wear-resistant composites. Herein, a biomimetic design strategy is proposed to create PTFE composites with a cellular-structured ceramic scaffold reinforcement microstructure, inspired by the anti-wear effect of enamel rod/inter-rod structure. By utilizing the preferential load support effect and debris size control mechanism of ceramic scaffold, the bio-inspired composites achieve excellent wear resistance with effective self-lubrication. Furthermore, a polydopamine modification technology for PTFE component is employed to enhance the adhesion and stability of PTFE transfer films, thereby improving the self-lubrication performance of the composites. Consequently, the resulting composites exhibit outstanding tribological properties, especially characterized by near-zero wear and good self-lubricity under heavy loads and high speeds. This work will advance the development of high-performance self-lubricating composites suitable for extreme conditions. Furthermore, the proposed design strategy is expected to be applicable to other biological prototypes, enabling the creation of diverse high-performance functional composites.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"14 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0