Friction最新文献_第5页

Tribological performance enhanced of PTFE composites by ultra-thin amorphous carbon films: Synergistic mechanism of fillers and films

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-04 DOI: 10.26599/frict.2025.9441091

Zhihao Chen, Jian Wu, Shouyao Liu, Yefei Zhou, Shixue He, Benlong Su, Youshan Wang

{"title":"Tribological performance enhanced of PTFE composites by ultra-thin amorphous carbon films: Synergistic mechanism of fillers and films","authors":"Zhihao Chen, Jian Wu, Shouyao Liu, Yefei Zhou, Shixue He, Benlong Su, Youshan Wang","doi":"10.26599/frict.2025.9441091","DOIUrl":"https://doi.org/10.26599/frict.2025.9441091","url":null,"abstract":"The enhanced wear resistance of polytetrafluoroethylene (PTFE) composites as sealing components in aerospace hydraulic systems is an important part of advancing aerospace technology. This study is conducted to strengthen synergistically the tribological performance of PTFE composites through filler modification and surface ultrathin amorphous carbon film modification. The results demonstrate that the carbon fiber (CF) filled PTFE composites and ultrathin amorphous carbon film can form a synergistic mechanism, exhibiting effective synergistic deformation and wear-resistant effects. The CF and amorphous carbon film combination forms a “hard-lubrication” region, which exhibits an interfacial support-self lubrication effect. In contrast, the amorphous carbon film on the PTFE surface forms a “soft-protection” region that provides interfacial protection and enables coordinated deformation with the substrate. The two regions collectively form the synergistic mechanism, which ensures the stability of the ultrathin amorphous carbon film and enables the achievement of tribological performance, particularly the enhancement of wear resistance. The deposition of amorphous carbon films on PTFE composites with a CF filler mass ratio of 20 wt% resulted in the most significant improvement in wear resistance, with a 51.09% reduction in wear rate.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"52 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143539256","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

Surface wettability-driven oil film formation in slider-on-disc contact under limited lubrication

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-03 DOI: 10.26599/frict.2025.9440990

Zhaogang Jing, Yusheng Jian, Feng Guo, Penghao Duan, Pat Lam Wong, Ziying Li

引用次数: 0

Tribological performance and lubrication mechanism of phosphate nanoflowers as oil-based additives

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-03 DOI: 10.26599/frict.2025.9440924

Linlin Duan, Dan Jia, Shengpeng Zhan, Suling Huang, Yijie Jin, Haitao Duan

{"title":"Tribological performance and lubrication mechanism of phosphate nanoflowers as oil-based additives","authors":"Linlin Duan, Dan Jia, Shengpeng Zhan, Suling Huang, Yijie Jin, Haitao Duan","doi":"10.26599/frict.2025.9440924","DOIUrl":"https://doi.org/10.26599/frict.2025.9440924","url":null,"abstract":"In this work, as a new type of oil-based additive, a phosphate mixture of (Sr0.9Ca0.1)3(PO4)2 and Sr3(PO4)2 (SrP) with a flower-like structure was synthesized. Compared with pure poly-α-olefin-8 (PAO8), when a titanium alloy is lubricated, the use of 20 wt% SrP for lubrication can reduce the coefficient of friction (COF) by 69.89% and the wear rate (WR) by 99.86%. The extraordinary tribological performance was attributed to the deposition of a layer of SrP on the surface of the titanium alloy. On the one hand, the deposition layer formed by SrP can prevent direct contact between friction pairs, protect the surface of the titanium alloy, and prevent adhesion wear of the titanium alloy. On the other hand, the low-shear interlayer sliding of SrP nanosheets inside the deposition layer was beneficial for friction reduction. X-ray photoelectron spectroscopy (XPS) confirmed that after frictional sliding, the active group phosphate in SrP was activated, and other metals were oxidized to produce a series of oxides. In addition, phosphate can form P‒O‒Ti bonds with titanium at the interface, which is the key to SrP deposition and adsorption on the surface of titanium alloys. The SrP additive not only exhibited excellent performance in lubricating titanium alloy discs but also stainless steel 304, 42CrMo, and tin bronze. After lubrication with 20 wt% SrP additive, the wear tracks of stainless steel 304 and 42CrMo were not detected, and WR of tin bronze decreased by 92%. An interface lubrication mechanism has been proposed that may be beneficial for the design and application of new lubricating materials.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"34 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538779","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

Roughness induced variation as a new mechanism for hydrodynamic lubrication between parallel surfaces

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-03 DOI: 10.26599/frict.2025.9441015

Pau Català, Vallbé-Mumbrú Marc, Francesc Pérez-Ràfols

引用次数: 0

Current and candidate additives for environmentally acceptable lubricants—A review

IF 6.8 1区工程技术

Friction Pub Date : 2025-02-28 DOI: 10.26599/frict.2025.9440988

Wenbo Wang, Jun Qu

引用次数: 0

Electrically promoted tribological changes at diamond-like carbon/steel interface under lubrication conditions

IF 6.8 1区工程技术

Friction Pub Date : 2025-02-28 DOI: 10.26599/frict.2025.9441088

Fu Wang, Yihua Wang, Xinjian Dong, Zhibo Wang, Dongshan Li, Guangan Zhang

{"title":"Electrically promoted tribological changes at diamond-like carbon/steel interface under lubrication conditions","authors":"Fu Wang, Yihua Wang, Xinjian Dong, Zhibo Wang, Dongshan Li, Guangan Zhang","doi":"10.26599/frict.2025.9441088","DOIUrl":"https://doi.org/10.26599/frict.2025.9441088","url":null,"abstract":"In modern machinery, the electrified contacts introduce novel lubrication challenges for sliding components. It is vital to understand the electrified tribological characteristics of tribo-materials. This work studied the electrified tribological changes at a DLC/steel sliding interface when lubricated with base oils. The results showed that electric current induced sticking friction, resulting in a friction reduction of approximately 5% to 20% when using mineral, PAO6, and castor oils in short-duration tests, conversely, a slight increase in friction with rapeseed oil. The electric current triggered the growth of a graphite-like tribo-layer on the DLC surface, particularly in ester-lubricated interfaces, which mitigated the wear of DLC. As sliding progressed, DLC film experienced peeling wear under electrified conditions, especially at high currents and loads. The tribo-layer, formed from tribo-oxidation of steel pair and lubricant degradation, was correlated with electrified tribological behavior. The enhanced adhesive and molecular interactions caused by the electric field across the contact were deemed to contribute to the sticking friction under electrified conditions. These findings validate the electrically caused tribological changes in lubricated DLC/steel contacts and indicate the necessity of a novel DLC film design to counteract electrified-induced damage.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"2 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143539219","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

Friction behaviour of graphene edges within carbon surface

IF 6.8 1区工程技术

Friction Pub Date : 2025-02-28 DOI: 10.26599/frict.2025.9441086

Kun Sun, Mingjun Sun, Ri Pan, Meijie Yin, Kai Qi, Dongju Chen, Jinwei Fan, Dongfeng Diao

{"title":"Friction behaviour of graphene edges within carbon surface","authors":"Kun Sun, Mingjun Sun, Ri Pan, Meijie Yin, Kai Qi, Dongju Chen, Jinwei Fan, Dongfeng Diao","doi":"10.26599/frict.2025.9441086","DOIUrl":"https://doi.org/10.26599/frict.2025.9441086","url":null,"abstract":"We reported a friction behaviour of graphene edges within carbon film, encompassing the structures ranged from amorphous carbon (a-C) to graphene nanocrystalline carbon (GNC). Structural characterization revealed that vertical-growing graphene nanocrystallites implanted into a-C structure, exposing high-density layer edges on the film surface. AFM nanofriction test highlighted the nature of graphene edge friction. Firstly, the edge friction of GNC films was tested at a critical-contact state, and the results showed that graphene edges exhibited lower friction forces compared to a-C edges. Secondly, the surface friction of GNC films was investigated at a full-contact state, revealing that the edge friction of graphene nanocrystallites regulated the surface friction of GNC films. As the edge density of graphene nanocrystallites increased, the nanofriction force of GNC films decreased. Finally, the mechanism of the regulated friction bahaviour was attributed to the amount of the edges of graphene nanocrystallites, which provided plentiful sp2 C dangling-bonds with weak bonding interactions and edge quantum wells with low surface potentials for lowing the friction. This finding shed light on the significance of graphene-related materials and their high-density edges in the structural design and nanofriction application of carbon films.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"190 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538770","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

Brittle-plastic synergistic removal mechanism and grain wear in ultrasonic grinding of anisotropic fiber-reinforced MMCs

IF 6.8 1区工程技术

Friction Pub Date : 2025-02-28 DOI: 10.26599/frict.2025.9441087

Tao Chen, Biao Zhao, Wenfeng Ding, Ning Qian, Jiuhua Xu, Yumin Wang

{"title":"Brittle-plastic synergistic removal mechanism and grain wear in ultrasonic grinding of anisotropic fiber-reinforced MMCs","authors":"Tao Chen, Biao Zhao, Wenfeng Ding, Ning Qian, Jiuhua Xu, Yumin Wang","doi":"10.26599/frict.2025.9441087","DOIUrl":"https://doi.org/10.26599/frict.2025.9441087","url":null,"abstract":"Continuous fiber reinforced metal matrix composites (CFMMCs) are increasingly utilized in high-performance aerospace engines due to their exceptional strength along the fiber axis. Unlike particle-reinforced metal matrix composites (PMMCs), CFMMCs exhibit significant anisotropic properties, which complicate their machining processes. While extensive studies have focused on tool wear in PMMCs, a notable research gap exists regarding the grinding removal mechanisms and grain wear behaviors in CFMMCs, particularly in the context of ultrasonic vibration-assisted grinding (UVAG). This study addresses this gap by investigating grain wear along different fiber orientations—perpendicular fiber (PF), transverse fiber (TF), and longitudinal fiber (LF)—through single grain grinding experiments on SiC fiber-reinforced TC17 matrix composites (SiCf/TC17). A detailed analysis of surface morphologies within the grinding scratches was conducted, revealing significant differences in CBN grain wear patterns under different fiber orientations, particularly when comparing UVAG with conventional grinding (CG). The results indicate that ultrasonic vibration effectively mitigates fiber fracture and grain wear, with the most severe grain wear and adhesion occurring when grinding along the LF orientation. This research not only advances the understanding of CFMMC grinding mechanisms but also contributes to enhancing the machinability of CFMMCs, thereby facilitating their broader application in aerospace and other high-performance industries.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"85 2 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538771","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

Investigation of the influence of substrate hardness on the tribological performance of graphene oxide solid lubricant coatings

IF 6.8 1区工程技术

Friction Pub Date : 2025-02-28 DOI: 10.26599/frict.2025.9441085

Yuzhen Liu, Hui Chen, Wenli Wang, Kai Le, Guoqing Wang, Yong Luo, Xiaoming Gao, Xu Zhao, Xingnan Liu, Shusheng Xu, Dae-Eun Kim, Weimin Liu

{"title":"Investigation of the influence of substrate hardness on the tribological performance of graphene oxide solid lubricant coatings","authors":"Yuzhen Liu, Hui Chen, Wenli Wang, Kai Le, Guoqing Wang, Yong Luo, Xiaoming Gao, Xu Zhao, Xingnan Liu, Shusheng Xu, Dae-Eun Kim, Weimin Liu","doi":"10.26599/frict.2025.9441085","DOIUrl":"https://doi.org/10.26599/frict.2025.9441085","url":null,"abstract":"This study explores the impact of substrate hardness on the tribological properties of graphene oxide (GO) solid lubricant coatings on NiP alloy layers coated Q235 steel. Through the adjustment of electroless plating parameters, NiP alloy layers with varying hardness levels were produced to investigate their effect on the wear resistance and friction performance of GO coatings. The methodology included substrate preparation, electroless NiP alloy plating, electrophoresis deposition of GO, and detailed analysis of the structural, mechanical, and tribological characteristics of the coatings. The findings underscore the crucial role of substrate hardness in the tribological efficiency of GO coatings. A specific hardness level emerged as optimal, significantly enhancing the distribution and effectiveness of the GO tribofilm. This uniform and continuous tribofilm presence led to notable improvements in wear resistance and a reduction in friction coefficients. Moreover, this optimal hardness ensured continuous lubrication and superior load-bearing capabilities, substantially prolonging the lifespan of the coatings. The substrates with either too high or too low hardness levels were observed to hinder the maintenance of a consistent tribofilm, thereby negatively impacting the tribological performance of the coating. Conclusively, this research highlights the significance of achieving an optimal substrate hardness to enhance the tribological performance of solid lubricant coatings. By optimizing the balance between substrate hardness and the integrity of the tribofilm, the study paves the way for developing more efficient, durable, and environmentally sustainable mechanical components, offering new insights into tribological science and materials engineering.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"41 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538769","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

Quantifying cross-country ski–snow friction using real-time kinematic positioning 利用实时运动定位量化越野滑雪与雪地之间的摩擦力

IF 6.8 1区工程技术

Friction Pub Date : 2025-02-27 DOI: 10.26599/frict.2025.9441011

Kalle Kalliorinne, Joakim Sandberg, Gustav Hindér, Hans-Christer Holmberg, Matej Supej, Roland Larsson, Andreas Almqvist

{"title":"Quantifying cross-country ski–snow friction using real-time kinematic positioning","authors":"Kalle Kalliorinne, Joakim Sandberg, Gustav Hindér, Hans-Christer Holmberg, Matej Supej, Roland Larsson, Andreas Almqvist","doi":"10.26599/frict.2025.9441011","DOIUrl":"https://doi.org/10.26599/frict.2025.9441011","url":null,"abstract":"In cross-country skiing, athletes expend large amounts of energy to overcome friction as their skis interact with snow. Even minor reductions in the friction can significantly influence race outcomes. Over the years, researchers have found many ways of quantifying ski–snow friction, but there are only a few methods that consider the glide of real-sized skis under natural conditions during both accelerating and decelerating movements. This study introduces a novel experimental setup, consisting of a sled equipped with authentic cross-country skis and a base station that uses satellite receivers to communicate via radio, constituting a real-time kinematic positioning system with centimetre accuracy. While the sled was running on a classic ski track with natural height variations, altitude and velocity data were recorded for quantification of the coefficient of friction (COF), both for accelerating and decelerating motion, employing a model based on Newton’s second law. The results show that the COF during acceleration was more than 20% higher than during deceleration, demonstrating dynamic changes in the frictional behaviour between these phases. This finding is crucial for the execution of all types of cross-country skiing techniques, where the athlete either accelerates or decelerates while moving forward. The ability of the current experimental set-up to distinguish between the COF during acceleration and deceleration has considerable implications for further developments.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"29 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538774","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