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Tribology of PTFE in Hydrogen Atmosphere
IF 6.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Tribology International
Pub Date : 2024-12-24 DOI: 10.1016/j.triboint.2024.110481
Shouyi Yin, Ambrose Taylor, Janet S.S. Wong
Hydrogen applications face sealing challenges. Often, these seals are made of PTFE and work under fretting conditions. Experiments in this study were conducted with PTFE against 52100 steel under varying humidity. Results show significant wear of PTFE in hydrogen, regardless of humidity, with PTFE transferring onto steel surfaces. FTIR and XPS analyses reveal that hydrogen's reducing effect suppresses surface metal oxide formation, inhibiting tribochemical reactions. However, when hydrogen is diluted with nitrogen, PTFE's tribological performance improves, though tribochemistry is not promoted. Only with oxygen and water vapour do tribochemical reactions occur in H2, where metal fluoride is first formed, followed by carboxylate chelates. These findings highlight the critical role of hydrogen's reducing nature, offering insights for developing advanced sealing materials.
{"title":"Tribology of PTFE in Hydrogen Atmosphere","authors":"Shouyi Yin,&nbsp;Ambrose Taylor,&nbsp;Janet S.S. Wong","doi":"10.1016/j.triboint.2024.110481","DOIUrl":"10.1016/j.triboint.2024.110481","url":null,"abstract":"<div><div>Hydrogen applications face sealing challenges. Often, these seals are made of PTFE and work under fretting conditions. Experiments in this study were conducted with PTFE against 52100 steel under varying humidity. Results show significant wear of PTFE in hydrogen, regardless of humidity, with PTFE transferring onto steel surfaces. FTIR and XPS analyses reveal that hydrogen's reducing effect suppresses surface metal oxide formation, inhibiting tribochemical reactions. However, when hydrogen is diluted with nitrogen, PTFE's tribological performance improves, though tribochemistry is not promoted. Only with oxygen and water vapour do tribochemical reactions occur in H<sub>2</sub>, where metal fluoride is first formed, followed by carboxylate chelates. These findings highlight the critical role of hydrogen's reducing nature, offering insights for developing advanced sealing materials.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"204 ","pages":"Article 110481"},"PeriodicalIF":6.1,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigating lubrication capacities of novel 2D hexagonal materials by DFT simulations
IF 6.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Tribology International
Pub Date : 2024-12-21 DOI: 10.1016/j.triboint.2024.110475
Haochen Feng , Ziwen Cheng , Zhibin Lu , Q.-C. He
The emergence of novel two-dimensional honeycomb materials offers new possibilities in tribology. In the present work, density functional theory (DFT) simulations are employed to explore the lubrication potential. The friction analysis of homojunction sliding models reveals that germanene (R180 configuration), phosphorene, and arsenene, collectively referred to as GPAene, exhibit low sliding energy barriers in comparison with those of graphene and MoS2, indicating their potential of serving as lubricants. Under the tensile strain, GPAene homojunctions show highly adjustable friction. In addition, all the heterojunctions composed of GPAene and graphene exhibit extremely low friction. However, in point contact mode, only phosphorene maintains a low friction. The simulation results provide theoretical guidance for experimental exploration and selection of new lubricating materials.
{"title":"Investigating lubrication capacities of novel 2D hexagonal materials by DFT simulations","authors":"Haochen Feng ,&nbsp;Ziwen Cheng ,&nbsp;Zhibin Lu ,&nbsp;Q.-C. He","doi":"10.1016/j.triboint.2024.110475","DOIUrl":"10.1016/j.triboint.2024.110475","url":null,"abstract":"<div><div>The emergence of novel two-dimensional honeycomb materials offers new possibilities in tribology. In the present work, density functional theory (DFT) simulations are employed to explore the lubrication potential. The friction analysis of homojunction sliding models reveals that germanene (R180 configuration), phosphorene, and arsenene, collectively referred to as GPAene, exhibit low sliding energy barriers in comparison with those of graphene and MoS<sub>2</sub>, indicating their potential of serving as lubricants. Under the tensile strain, GPAene homojunctions show highly adjustable friction. In addition, all the heterojunctions composed of GPAene and graphene exhibit extremely low friction. However, in point contact mode, only phosphorene maintains a low friction. The simulation results provide theoretical guidance for experimental exploration and selection of new lubricating materials.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"204 ","pages":"Article 110475"},"PeriodicalIF":6.1,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158915","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
Bulk conformation and shear-induced transitions in bottlebrush poly(alkyl methacrylate): The role of side chain length and polymer flexibility
IF 6.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Tribology International
Pub Date : 2024-12-20 DOI: 10.1016/j.triboint.2024.110476
Himanshu Shekhar, Yuma Chikazawa, Yuxi Song, Hedong Zhang
Optimal design of polymeric friction modifiers (PFMs) in lubricating oils is crucial for enhancing energy efficiency. This study examines the impact of side chain length on the flexibility and conformation of bottlebrush PFM poly(alkyl methacrylate) in bulk oil solutions and under shear using molecular dynamics simulations. We semi-quantify polymer flexibility through cluster analysis, revealing coil-globule transitions at varying temperatures. Under shear, polymers exhibit translational and rotational motion with conformational changes, driven by shearing and temporary surface adsorption. A concentrated distribution of adsorbed atoms is crucial for stable adsorption in the subsequent translational phase. Polymers with shorter side chains demonstrate stable adsorption with a coil conformation, while those with longer side chains lack stable adsorption, repeating translation-rotation cycles and coil-globule transitions.
{"title":"Bulk conformation and shear-induced transitions in bottlebrush poly(alkyl methacrylate): The role of side chain length and polymer flexibility","authors":"Himanshu Shekhar,&nbsp;Yuma Chikazawa,&nbsp;Yuxi Song,&nbsp;Hedong Zhang","doi":"10.1016/j.triboint.2024.110476","DOIUrl":"10.1016/j.triboint.2024.110476","url":null,"abstract":"<div><div>Optimal design of polymeric friction modifiers (PFMs) in lubricating oils is crucial for enhancing energy efficiency. This study examines the impact of side chain length on the flexibility and conformation of bottlebrush PFM poly(alkyl methacrylate) in bulk oil solutions and under shear using molecular dynamics simulations. We semi-quantify polymer flexibility through cluster analysis, revealing coil-globule transitions at varying temperatures. Under shear, polymers exhibit translational and rotational motion with conformational changes, driven by shearing and temporary surface adsorption. A concentrated distribution of adsorbed atoms is crucial for stable adsorption in the subsequent translational phase. Polymers with shorter side chains demonstrate stable adsorption with a coil conformation, while those with longer side chains lack stable adsorption, repeating translation-rotation cycles and coil-globule transitions.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"204 ","pages":"Article 110476"},"PeriodicalIF":6.1,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impact-sliding fretting tribo-corrosion behaviors of Inconel 690 alloy pretreated with HTHP immersion for different durations
IF 6.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Tribology International
Pub Date : 2024-12-20 DOI: 10.1016/j.triboint.2024.110468
Guoping Wang, Hailong Xiong, Sijia Zhou, Meigui Yin
This study subjected Inconel 690 alloy tubes to pre-immersion treatment in high-temperature and high-pressure (HTHP) artificial seawater (3.5 wt% NaCl) for different days (untreated, 1 day, 2 days, and 3 days). Then, impact-sliding fretting tribo-corrosion test rig was used to investigate its damage failure mechanism and electrochemical-corrosion dynamic response behaviors. Results showed that the oxidized corrosion layer that formed among the Inconel 690 alloy tubes surface increasingly densified with increased pre-immersion duration. These reduced the damage degree of fretting interface. However, the pre-formed oxidized corrosion layer accelerated the alloy tube’s electrochemical corrosion process. Additionally, the main impact-sliding fretting tribo-corrosion mechanisms of all test samples were abrasive wear, plastic deformation, and spalling.
{"title":"Impact-sliding fretting tribo-corrosion behaviors of Inconel 690 alloy pretreated with HTHP immersion for different durations","authors":"Guoping Wang,&nbsp;Hailong Xiong,&nbsp;Sijia Zhou,&nbsp;Meigui Yin","doi":"10.1016/j.triboint.2024.110468","DOIUrl":"10.1016/j.triboint.2024.110468","url":null,"abstract":"<div><div>This study subjected Inconel 690 alloy tubes to pre-immersion treatment in high-temperature and high-pressure (HTHP) artificial seawater (3.5 wt% NaCl) for different days (untreated, 1 day, 2 days, and 3 days). Then, impact-sliding fretting tribo-corrosion test rig was used to investigate its damage failure mechanism and electrochemical-corrosion dynamic response behaviors. Results showed that the oxidized corrosion layer that formed among the Inconel 690 alloy tubes surface increasingly densified with increased pre-immersion duration. These reduced the damage degree of fretting interface. However, the pre-formed oxidized corrosion layer accelerated the alloy tube’s electrochemical corrosion process. Additionally, the main impact-sliding fretting tribo-corrosion mechanisms of all test samples were abrasive wear, plastic deformation, and spalling.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"204 ","pages":"Article 110468"},"PeriodicalIF":6.1,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158919","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
Lubricant seepage behavior of porous polyimide cage materials under sliding contact loading
IF 6.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Tribology International
Pub Date : 2024-12-19 DOI: 10.1016/j.triboint.2024.110470
Xiangyu Feng, Pengzhe Zhu, Wenzhong Wang
Porous polyimide is a high-performance self-lubricating material widely used as an oil storage medium in aerospace bearing cages. This paper investigates the transient seepage behavior of oil-containing porous cage materials under sliding contact loading. It is found that there are multiple seepage regions within porous media during the seepage process, which interact to facilitate the inflow and outflow of lubricant. The extrusion effect plays a critical role in determining seepage behavior, while the centrifugal effect has a lesser impact on surface seepage rate and lubricant outflow in porous media. The extrusion effect also contributes to the formation of the "tribological rehydration" phenomenon. This study provides a theoretical foundation for understanding the continuous oil supply mechanism in aerospace bearing cage materials.
{"title":"Lubricant seepage behavior of porous polyimide cage materials under sliding contact loading","authors":"Xiangyu Feng,&nbsp;Pengzhe Zhu,&nbsp;Wenzhong Wang","doi":"10.1016/j.triboint.2024.110470","DOIUrl":"10.1016/j.triboint.2024.110470","url":null,"abstract":"<div><div>Porous polyimide is a high-performance self-lubricating material widely used as an oil storage medium in aerospace bearing cages. This paper investigates the transient seepage behavior of oil-containing porous cage materials under sliding contact loading. It is found that there are multiple seepage regions within porous media during the seepage process, which interact to facilitate the inflow and outflow of lubricant. The extrusion effect plays a critical role in determining seepage behavior, while the centrifugal effect has a lesser impact on surface seepage rate and lubricant outflow in porous media. The extrusion effect also contributes to the formation of the \"tribological rehydration\" phenomenon. This study provides a theoretical foundation for understanding the continuous oil supply mechanism in aerospace bearing cage materials.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"204 ","pages":"Article 110470"},"PeriodicalIF":6.1,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158918","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
The tribogram: An AFM-based nanoscale tribocorrosion analysis method incorporating tip convolution effects
IF 6.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Tribology International
Pub Date : 2024-12-19 DOI: 10.1016/j.triboint.2024.110471
Hwaran Lee , Jeremy L. Gilbert
Fretting corrosion, or mechanically assisted crevice corrosion (MACC), at a modular taper junctions of hip implants remains a significant clinical concern. This study introduced a novel atomic force microscopy (AFM)-based method to monitor real-time nanoscale wear and tribocorrosion progression on low carbon cobalt-chromium-molybdenum (CoCrMo) alloy by inducing repetitive nanowear at a fixed location under air (wear only) and phosphate-buffered saline (PBS, wear and corrosion). We visualized and quantified wear evolution in situ using a “tribogram” (height vs. sliding distance vs. wear cycles) while addressing tip convolution effects on large discrepancies in mass balance analysis between bearing-based and calculated true volumes. The tribogram revealed reduced wear in PBS compared to air, possibly due to repassivating oxide effects (topographical rises in tribogram).
{"title":"The tribogram: An AFM-based nanoscale tribocorrosion analysis method incorporating tip convolution effects","authors":"Hwaran Lee ,&nbsp;Jeremy L. Gilbert","doi":"10.1016/j.triboint.2024.110471","DOIUrl":"10.1016/j.triboint.2024.110471","url":null,"abstract":"<div><div>Fretting corrosion, or mechanically assisted crevice corrosion (MACC), at a modular taper junctions of hip implants remains a significant clinical concern. This study introduced a novel atomic force microscopy (AFM)-based method to monitor real-time nanoscale wear and tribocorrosion progression on low carbon cobalt-chromium-molybdenum (CoCrMo) alloy by inducing repetitive nanowear at a fixed location under air (wear only) and phosphate-buffered saline (PBS, wear and corrosion). We visualized and quantified wear evolution in situ using a “tribogram” (height vs. sliding distance vs. wear cycles) while addressing tip convolution effects on large discrepancies in mass balance analysis between bearing-based and calculated true volumes. The tribogram revealed reduced wear in PBS compared to air, possibly due to repassivating oxide effects (topographical rises in tribogram).</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"204 ","pages":"Article 110471"},"PeriodicalIF":6.1,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158921","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
Novel use of laser melting and optical pre-heat to control white etching layer formation on rail steels
IF 6.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Tribology International
Pub Date : 2024-12-18 DOI: 10.1016/j.triboint.2024.110472
Yue Yang , Alkim Aydin , Kamran Mumtaz , Markus Januschewsky , Alexander Meierhofer , Roger Lewis
With the development of the railway industry, rail damage like Rolling Contact Fatigue (RCF) and White Etching Layer (WEL) are significant safety concerns. This study explores using lasers to replicate WELs on rail steels in a controlled, cost-efficient way in the laboratory. By optimising laser parameters like power, speed, and material, WELs similar to those in service rails were produced on R260, R350HT, and R400HT rail grades. The laser method yields precise WEL formation with thicknesses between 8 and 145 μm, offering better control and consistency than conventional methods. While thermally processed WELs are not fully representative of those formed by thermo-mechanical loading, they share similar hardness and size. This advancement supports further tribological testing and research on RCF-related damage.
{"title":"Novel use of laser melting and optical pre-heat to control white etching layer formation on rail steels","authors":"Yue Yang ,&nbsp;Alkim Aydin ,&nbsp;Kamran Mumtaz ,&nbsp;Markus Januschewsky ,&nbsp;Alexander Meierhofer ,&nbsp;Roger Lewis","doi":"10.1016/j.triboint.2024.110472","DOIUrl":"10.1016/j.triboint.2024.110472","url":null,"abstract":"<div><div>With the development of the railway industry, rail damage like Rolling Contact Fatigue (RCF) and White Etching Layer (WEL) are significant safety concerns. This study explores using lasers to replicate WELs on rail steels in a controlled, cost-efficient way in the laboratory. By optimising laser parameters like power, speed, and material, WELs similar to those in service rails were produced on R260, R350HT, and R400HT rail grades. The laser method yields precise WEL formation with thicknesses between 8 and 145 μm, offering better control and consistency than conventional methods. While thermally processed WELs are not fully representative of those formed by thermo-mechanical loading, they share similar hardness and size. This advancement supports further tribological testing and research on RCF-related damage.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"204 ","pages":"Article 110472"},"PeriodicalIF":6.1,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159765","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
Molecular dynamics study on the interlayer friction behavior of two-dimensional binary materials under non-fixed mismatched angles: A comprehensive analysis of boron nitride nanosheets
IF 6.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Tribology International
Pub Date : 2024-12-18 DOI: 10.1016/j.triboint.2024.110462
Kejing Wang , Jianzhang Huang , Yi Cai , Yingjing Liang , Qiang Han
Two-dimensional binary materials, due to their unique optoelectronic properties and excellent mechanical stability, are ideal candidates for addressing tribological issues in micro-nano electromechanical systems. This study employs molecular dynamics simulations to investigate the interlayer behavior of boron nitride under rotational friction. We systematically analyzed the effects of normal load, uniaxial strain, sliding velocity, temperature, and substrate stiffness on friction performance. Results indicate that rotational sliding reduces the friction force differences under various directional strains. Complex coupling relationships exist among these factors, such as increased load enhancing thermally activated lubrication mechanisms. The study also captured an atomic trajectory selection mechanism that controls atomic motion via speed, its reversibility and controllability offering a new way to dynamically regulate interlayer friction.
{"title":"Molecular dynamics study on the interlayer friction behavior of two-dimensional binary materials under non-fixed mismatched angles: A comprehensive analysis of boron nitride nanosheets","authors":"Kejing Wang ,&nbsp;Jianzhang Huang ,&nbsp;Yi Cai ,&nbsp;Yingjing Liang ,&nbsp;Qiang Han","doi":"10.1016/j.triboint.2024.110462","DOIUrl":"10.1016/j.triboint.2024.110462","url":null,"abstract":"<div><div>Two-dimensional binary materials, due to their unique optoelectronic properties and excellent mechanical stability, are ideal candidates for addressing tribological issues in micro-nano electromechanical systems. This study employs molecular dynamics simulations to investigate the interlayer behavior of boron nitride under rotational friction. We systematically analyzed the effects of normal load, uniaxial strain, sliding velocity, temperature, and substrate stiffness on friction performance. Results indicate that rotational sliding reduces the friction force differences under various directional strains. Complex coupling relationships exist among these factors, such as increased load enhancing thermally activated lubrication mechanisms. The study also captured an atomic trajectory selection mechanism that controls atomic motion via speed, its reversibility and controllability offering a new way to dynamically regulate interlayer friction.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"204 ","pages":"Article 110462"},"PeriodicalIF":6.1,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158912","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
Lubrication performance of 5CB liquid crystal combined with different wear-resistant coatings on friction surface
IF 6.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Tribology International
Pub Date : 2024-12-18 DOI: 10.1016/j.triboint.2024.110469
Qihang Cui , Jingsi Wang , Jiayuan Wang , Chengdi Li , Yan Shen , Pay Jun Liew , Jiujun Xu
The tribological behaviors of chromium-based ceramic composite coating (CCC) and diamond-like carbon coating (DLC) are investigated by reciprocating sliding experiments, respectively, under lubrication conditions with and without 5CB liquid crystal additives. The addition of 5CB significantly improves the lubrication performance and protects the coatings, which is attributed to the formation of a thin lubricating film on the friction surface by 5CB molecules. The reduction in friction and wear of the CCC friction pair is more obvious, implying that the formation of the lubricating film is affected by the coating. These findings suggest a great potential for the use of liquid crystal lubricant additive in combination with solid wear-resistant coatings, which is helpful for the development of high-performance lubrication systems.
{"title":"Lubrication performance of 5CB liquid crystal combined with different wear-resistant coatings on friction surface","authors":"Qihang Cui ,&nbsp;Jingsi Wang ,&nbsp;Jiayuan Wang ,&nbsp;Chengdi Li ,&nbsp;Yan Shen ,&nbsp;Pay Jun Liew ,&nbsp;Jiujun Xu","doi":"10.1016/j.triboint.2024.110469","DOIUrl":"10.1016/j.triboint.2024.110469","url":null,"abstract":"<div><div>The tribological behaviors of chromium-based ceramic composite coating (CCC) and diamond-like carbon coating (DLC) are investigated by reciprocating sliding experiments, respectively, under lubrication conditions with and without 5CB liquid crystal additives. The addition of 5CB significantly improves the lubrication performance and protects the coatings, which is attributed to the formation of a thin lubricating film on the friction surface by 5CB molecules. The reduction in friction and wear of the CCC friction pair is more obvious, implying that the formation of the lubricating film is affected by the coating. These findings suggest a great potential for the use of liquid crystal lubricant additive in combination with solid wear-resistant coatings, which is helpful for the development of high-performance lubrication systems.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"204 ","pages":"Article 110469"},"PeriodicalIF":6.1,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158911","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
Probing the self-adaptive grinding behaviours of high-speed rail grinding under the sliding-rolling composite motions
IF 6.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Tribology International
Pub Date : 2024-12-18 DOI: 10.1016/j.triboint.2024.110473
Jinhong You , Wulin Zhang , Yu Cheng , Menggang Guo , Shengpeng Zhan , Haitao Duan , Dan Jia
The self-adaptive grinding behaviours of high-speed rail grinding under sliding-rolling composite motions of grinding wheels were studied using a homemade apparatus. The slide-roll ratio increased with contact angle and grinding load, primarily influenced by the contact angle. As slide-roll ratio rose from 0.17 to 0.83, the lowest surface roughness (Ra ≤ 3.5 μm) and thinnest white etching layers (≤ 4.0 μm) were achieved due to enhanced grinding actions of grinding wheel. Sliding motion enabled rail material removal, while rolling motion promoted debris discharge and grinding wheel self-sharpening. The highest grinding efficiency occurred at a 45° contact angle, while the best surface quality appeared at 60°. Optimizing sliding-rolling composite motion is key to balancing efficiency and surface quality.
{"title":"Probing the self-adaptive grinding behaviours of high-speed rail grinding under the sliding-rolling composite motions","authors":"Jinhong You ,&nbsp;Wulin Zhang ,&nbsp;Yu Cheng ,&nbsp;Menggang Guo ,&nbsp;Shengpeng Zhan ,&nbsp;Haitao Duan ,&nbsp;Dan Jia","doi":"10.1016/j.triboint.2024.110473","DOIUrl":"10.1016/j.triboint.2024.110473","url":null,"abstract":"<div><div>The self-adaptive grinding behaviours of high-speed rail grinding under sliding-rolling composite motions of grinding wheels were studied using a homemade apparatus. The slide-roll ratio increased with contact angle and grinding load, primarily influenced by the contact angle. As slide-roll ratio rose from 0.17 to 0.83, the lowest surface roughness (Ra ≤ 3.5 μm) and thinnest white etching layers (≤ 4.0 μm) were achieved due to enhanced grinding actions of grinding wheel. Sliding motion enabled rail material removal, while rolling motion promoted debris discharge and grinding wheel self-sharpening. The highest grinding efficiency occurred at a 45° contact angle, while the best surface quality appeared at 60°. Optimizing sliding-rolling composite motion is key to balancing efficiency and surface quality.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"205 ","pages":"Article 110473"},"PeriodicalIF":6.1,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143093490","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
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