Pub Date : 2022-05-10DOI: 10.1080/17515831.2022.2050605
F. Yusubov
ABSTRACT This research is focused on investigating new low metallic non-asbestos organic friction composite materials obtained by conventional powder metallurgy techniques. Three different composite mixtures were prepared by varying brass concentrations 1.5, 2.0 and 2.5 wt-% using the glycerin as a plasticizer. The prepared brake pad materials were subjected to density, hardness, thermal stability, friction and specific wear rate analysis. Tribological properties of friction specimen were studied on pin-on-disc type friction testing machine model MMW-1 using nominal contact pressure 7.69 MPa, sliding velocity 1.74 m/s and 1.57 km sliding distance conditions. Microstructural characterization of worn surfaces was carried out using scanning electron microscopy. Obtained test results indicate that brass chips have an important effect on improving tribo-performance. Physical–mechanical characterization of friction composites showed that the use of glycerin improves the physical properties of materials by improving the powder compressibility and reducing the structural defects formed by brass chips. GRAPHICAL ABSTRACT
{"title":"Development and characterization of low metallic friction composites filled with brass chips","authors":"F. Yusubov","doi":"10.1080/17515831.2022.2050605","DOIUrl":"https://doi.org/10.1080/17515831.2022.2050605","url":null,"abstract":"ABSTRACT This research is focused on investigating new low metallic non-asbestos organic friction composite materials obtained by conventional powder metallurgy techniques. Three different composite mixtures were prepared by varying brass concentrations 1.5, 2.0 and 2.5 wt-% using the glycerin as a plasticizer. The prepared brake pad materials were subjected to density, hardness, thermal stability, friction and specific wear rate analysis. Tribological properties of friction specimen were studied on pin-on-disc type friction testing machine model MMW-1 using nominal contact pressure 7.69 MPa, sliding velocity 1.74 m/s and 1.57 km sliding distance conditions. Microstructural characterization of worn surfaces was carried out using scanning electron microscopy. Obtained test results indicate that brass chips have an important effect on improving tribo-performance. Physical–mechanical characterization of friction composites showed that the use of glycerin improves the physical properties of materials by improving the powder compressibility and reducing the structural defects formed by brass chips. GRAPHICAL ABSTRACT","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"16 1","pages":"256 - 266"},"PeriodicalIF":1.3,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46254352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-10DOI: 10.1080/17515831.2022.2045427
Nicolas Grenet – de Bechillon, T. Touret, J. Cavoret, C. Changenet, F. Ville, D. Ghribi
ABSTRACT This paper investigates the strong coupling between friction power losses and film thickness that prevent from clearly identifying the mechanism of scuffing through classical test procedures. As the film thickness appears of great influence on the phenomena, a new test method is presented, allowing scuffing initiation study with the film thickness as a key parameter. This new test method allows film thickness variation with minimal friction losses and bulk temperature variations. This procedure has been developed with nitrided steels and a synthetic base oil on a twin disks test rig. Even though asperity contact is considered necessary in literature for scuffing, the test result shows that it can be reached in full film lubrication, potentially through the collapse of the oil film. Different test methods allowing triggering scuffing through different parameters are identified, which shows that a variety of parameters is able to influence scuffing.
{"title":"A new experimental methodology to assess gear scuffing initiation","authors":"Nicolas Grenet – de Bechillon, T. Touret, J. Cavoret, C. Changenet, F. Ville, D. Ghribi","doi":"10.1080/17515831.2022.2045427","DOIUrl":"https://doi.org/10.1080/17515831.2022.2045427","url":null,"abstract":"ABSTRACT This paper investigates the strong coupling between friction power losses and film thickness that prevent from clearly identifying the mechanism of scuffing through classical test procedures. As the film thickness appears of great influence on the phenomena, a new test method is presented, allowing scuffing initiation study with the film thickness as a key parameter. This new test method allows film thickness variation with minimal friction losses and bulk temperature variations. This procedure has been developed with nitrided steels and a synthetic base oil on a twin disks test rig. Even though asperity contact is considered necessary in literature for scuffing, the test result shows that it can be reached in full film lubrication, potentially through the collapse of the oil film. Different test methods allowing triggering scuffing through different parameters are identified, which shows that a variety of parameters is able to influence scuffing.","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"16 1","pages":"245 - 255"},"PeriodicalIF":1.3,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44413881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-25DOI: 10.1080/17515831.2021.2023289
Trupti P. Wani, R. Raja, P. Sampathkumaran, S. Seetharamu, R.R.N. Sailaja Bhattacharya, S. Deshpande
ABSTRACT The present study explores the possibilities of reinforcing High-Density Poly Ethylene (HDPE) + Nano-Clay (NC) composite with locally available inexpensive plane woven bi-directional Silk Fibre (SF) fabric for developing a new tribo material. HDPE, NC & SF were incorporated into produce hybrid laminated composites using a hot compression technique. Further, the additions of NC to bi-directional SF-based HDPE composites at five levels in the range 0.1–1.0 wt-% have improved the tribological characteristics greatly compared to HDPE + SF samples as well as pure HDPE. The experimental results indicate that SF and NC improved the wear behaviour of neat polymer. The CoF of HDPE + SF + 0.1NC over HDPE + SF & pure HDPE decreased by 15% and 30%, respectively. The results reveal that the wear loss of HDPE + SF + 0.1NC is very much lower over HDPE + SF & pure HDPE and they are about 24% and 30%, respectively. GRAPHICAL ABSTRACT
摘要:本研究探索了高密度聚乙烯(HDPE) +纳米粘土(NC)复合材料与当地廉价的平面编织双向丝绸纤维(SF)织物增强的可能性，以开发一种新的摩擦材料。HDPE, NC和SF被纳入生产混合层压复合材料使用热压缩技术。此外，与HDPE + SF样品和纯HDPE相比，在0.1-1.0 wt-%范围内添加5个水平的NC，大大改善了双向SF基HDPE复合材料的摩擦学特性。实验结果表明，SF和NC改善了整齐聚合物的磨损性能。与HDPE + SF和纯HDPE相比，HDPE + SF + 0.1NC的CoF分别降低了15%和30%。结果表明，HDPE + SF + 0.1NC的磨损损失比HDPE + SF和纯HDPE要低得多，分别约为24%和30%。图形抽象
{"title":"Tribological behaviour of silk fibre reinforced HDPE nano composite","authors":"Trupti P. Wani, R. Raja, P. Sampathkumaran, S. Seetharamu, R.R.N. Sailaja Bhattacharya, S. Deshpande","doi":"10.1080/17515831.2021.2023289","DOIUrl":"https://doi.org/10.1080/17515831.2021.2023289","url":null,"abstract":"ABSTRACT The present study explores the possibilities of reinforcing High-Density Poly Ethylene (HDPE) + Nano-Clay (NC) composite with locally available inexpensive plane woven bi-directional Silk Fibre (SF) fabric for developing a new tribo material. HDPE, NC & SF were incorporated into produce hybrid laminated composites using a hot compression technique. Further, the additions of NC to bi-directional SF-based HDPE composites at five levels in the range 0.1–1.0 wt-% have improved the tribological characteristics greatly compared to HDPE + SF samples as well as pure HDPE. The experimental results indicate that SF and NC improved the wear behaviour of neat polymer. The CoF of HDPE + SF + 0.1NC over HDPE + SF & pure HDPE decreased by 15% and 30%, respectively. The results reveal that the wear loss of HDPE + SF + 0.1NC is very much lower over HDPE + SF & pure HDPE and they are about 24% and 30%, respectively. GRAPHICAL ABSTRACT","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"16 1","pages":"226 - 234"},"PeriodicalIF":1.3,"publicationDate":"2022-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47846494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-02DOI: 10.1080/17515831.2022.2022972
J. Katiyar, T. Rao
The salient feature of this special issue on ‘Impact of Tribology on Society’ is to present recent advances in tribology emphasizing overall human wellbeing and economy. This special issue reports significant contribution from academicians, scientists, researchers, engineers, research scholars and students who participated in the International Tribology Research Symposium (ITRS 2020) organized online throughout 5th–7th November 2020. The registration charges are cancelled in ITRS 2020 to encourage participants to share their experiences and research results covering broad spectrum of topics related to Tribology. The organizing committee of ITRS 2020 is highly indebted to the renowned plenary, keynote, and invited speakers for discussing the most recent innovations and trends in the field of tribology. The innovations in tribological approaches are crucial to the economic success, sustainability and quality of life of society. The tribological systems are highly complex with a wide range of potential interlinked parameters demanding thorough investigations. The research contributions in this special issue are selected to render the reader an overview of the highly challenging multidisciplinary approaches impacting tribology on society. The special issue presents state-of-the-art in lubricant additives, highly challenging problems encountered under severe dynamic loading conditions, optimization of tribological properties based on simulations, tribological enhancements through advances in materials and coatings. The titles covered in this special issue are related to an overview of nanoadditives in lubricants, WEAs growth under dynamic loading, optimization of wear using ANN and Taguchi approaches, tribological characteristics of composites, and tribological behaviour of coatings. The potential advances in nanolubricants, understanding of WEAs, minimization of wear using machine learning, and tribological characteristics enhancement using composites and coatings may motivate the researchers advancing using multi-disciplinary approaches in tribology. The guest editors hope that the special issue highlighting the impact of tribology on society will serve as a useful reference to tribologists and provide the reader an insight of advances impacting tribology on society. Finally, we would like to thank Editor, Professor Tomasz Liskiewicz, Taylor and Francis publishing and our valued reviewers, for their enormous encouragement and involvement in this special issue.
{"title":"Impact of Tribology on society","authors":"J. Katiyar, T. Rao","doi":"10.1080/17515831.2022.2022972","DOIUrl":"https://doi.org/10.1080/17515831.2022.2022972","url":null,"abstract":"The salient feature of this special issue on ‘Impact of Tribology on Society’ is to present recent advances in tribology emphasizing overall human wellbeing and economy. This special issue reports significant contribution from academicians, scientists, researchers, engineers, research scholars and students who participated in the International Tribology Research Symposium (ITRS 2020) organized online throughout 5th–7th November 2020. The registration charges are cancelled in ITRS 2020 to encourage participants to share their experiences and research results covering broad spectrum of topics related to Tribology. The organizing committee of ITRS 2020 is highly indebted to the renowned plenary, keynote, and invited speakers for discussing the most recent innovations and trends in the field of tribology. The innovations in tribological approaches are crucial to the economic success, sustainability and quality of life of society. The tribological systems are highly complex with a wide range of potential interlinked parameters demanding thorough investigations. The research contributions in this special issue are selected to render the reader an overview of the highly challenging multidisciplinary approaches impacting tribology on society. The special issue presents state-of-the-art in lubricant additives, highly challenging problems encountered under severe dynamic loading conditions, optimization of tribological properties based on simulations, tribological enhancements through advances in materials and coatings. The titles covered in this special issue are related to an overview of nanoadditives in lubricants, WEAs growth under dynamic loading, optimization of wear using ANN and Taguchi approaches, tribological characteristics of composites, and tribological behaviour of coatings. The potential advances in nanolubricants, understanding of WEAs, minimization of wear using machine learning, and tribological characteristics enhancement using composites and coatings may motivate the researchers advancing using multi-disciplinary approaches in tribology. The guest editors hope that the special issue highlighting the impact of tribology on society will serve as a useful reference to tribologists and provide the reader an insight of advances impacting tribology on society. Finally, we would like to thank Editor, Professor Tomasz Liskiewicz, Taylor and Francis publishing and our valued reviewers, for their enormous encouragement and involvement in this special issue.","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"16 1","pages":"1 - 1"},"PeriodicalIF":1.3,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49368766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-17DOI: 10.1080/17515831.2021.2002598
P. Ritapure, A. Damale, R. Yadav, Y. R. Kharde
ABSTRACT This paper proposes a unique Al25Zn/SiC/Graphite hybrid composite for plain bearing and other wear-resistant applications. Newly synthesized composites of Al–25Zn alloy reinforced with 3 wt-% graphite and 10, 15 and 20 wt-% SiC are tested using a pin on the disc tribometer following ASTM G-99 standard against EN24 disc. Sliding wear studies using the Taguchi L16 array are carried out for a set of parameters including pin temperature, speed, load and a constant sliding distance. The results reveal that adding 3 wt-% graphite into Al25Zn/SiC composites greatly enhances wear resistance, tensile strength, impact strength and ductility at the expense of hardness. The wear behaviour of the composites is predicted using an artificial neural network and a regression model. Adhesion is found the most common wear mechanism in matrix alloys, while abrasion and delamination in composites. Among the examined materials, the composite with 3 wt-% graphite and 15 wt-% SiC has the optimum combination of characteristics. GRAPHICAL ABSTRACT
{"title":"Optimization of dry sliding wear characteristics of Al–25Zn/SiC hybrid composites by graphite reinforcement using artificial neural network and Taguchi’s method","authors":"P. Ritapure, A. Damale, R. Yadav, Y. R. Kharde","doi":"10.1080/17515831.2021.2002598","DOIUrl":"https://doi.org/10.1080/17515831.2021.2002598","url":null,"abstract":"ABSTRACT This paper proposes a unique Al25Zn/SiC/Graphite hybrid composite for plain bearing and other wear-resistant applications. Newly synthesized composites of Al–25Zn alloy reinforced with 3 wt-% graphite and 10, 15 and 20 wt-% SiC are tested using a pin on the disc tribometer following ASTM G-99 standard against EN24 disc. Sliding wear studies using the Taguchi L16 array are carried out for a set of parameters including pin temperature, speed, load and a constant sliding distance. The results reveal that adding 3 wt-% graphite into Al25Zn/SiC composites greatly enhances wear resistance, tensile strength, impact strength and ductility at the expense of hardness. The wear behaviour of the composites is predicted using an artificial neural network and a regression model. Adhesion is found the most common wear mechanism in matrix alloys, while abrasion and delamination in composites. Among the examined materials, the composite with 3 wt-% graphite and 15 wt-% SiC has the optimum combination of characteristics. GRAPHICAL ABSTRACT","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"16 1","pages":"76 - 89"},"PeriodicalIF":1.3,"publicationDate":"2021-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43740441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-04DOI: 10.1080/17515831.2021.1981720
A. Ashraf, W. K. Shafi, M. I. Ul Haq, Ankush Raina
ABSTRACT With the advancement in the field of nanotechnology, various researchers have reported an improvement in the friction and wear behaviour of different lubricating oils by the addition of different nano additives. However, the stability of these nano additives remains a challenge. In this paper, the dispersion stability of various nano additives in lubricating oils has been studied in detail. The paper aims to summarize various dispersion stability theories and several methods reported in the literature to improve dispersion stability. Apart from this, a special focus has been laid to highlight the various surfactants used to improve the dispersion stability, particularly the tribological properties. The literature suggests that although a number of studies have been carried out to study the effect of surfactant addition on dispersion stability, however, future developments could be focused to improve the dispersion stability of the existing mono and hybrid nano fluids and their underlying mechanisms. Abbreviations: SWCNH, single-walled carbon nano-horns; PAO, poly alpha olefin; MoS2, molybdenum di sulphide; H, Hamaker constant, MWCNTs, multi-walled carbon nanotubes; GNF, graphene nanoflakes; DLVO, Derjaguin and Landau Verway and Overbeek; DLS, dynamic light scattering; HLB, hydrophobic lyophilic balance; FERTEM, freeze etching replication transmission electron microscope; SDS, sodium dodecyl sulphate; PTFE, polytetrafluoroethylene; FTIR, Fourier-transform infrared spectroscopy; TBAAc, tetra butyl ammonium acetate; THF, tetrahydrofurane; UV–Vis, ultraviolet visible light; SEM, scanning electron microscope; TEM, transmission electron microscope GRAPHICAL ABSTRACT
{"title":"Dispersion stability of nano additives in lubricating oils – an overview of mechanisms, theories and methodologies","authors":"A. Ashraf, W. K. Shafi, M. I. Ul Haq, Ankush Raina","doi":"10.1080/17515831.2021.1981720","DOIUrl":"https://doi.org/10.1080/17515831.2021.1981720","url":null,"abstract":"ABSTRACT With the advancement in the field of nanotechnology, various researchers have reported an improvement in the friction and wear behaviour of different lubricating oils by the addition of different nano additives. However, the stability of these nano additives remains a challenge. In this paper, the dispersion stability of various nano additives in lubricating oils has been studied in detail. The paper aims to summarize various dispersion stability theories and several methods reported in the literature to improve dispersion stability. Apart from this, a special focus has been laid to highlight the various surfactants used to improve the dispersion stability, particularly the tribological properties. The literature suggests that although a number of studies have been carried out to study the effect of surfactant addition on dispersion stability, however, future developments could be focused to improve the dispersion stability of the existing mono and hybrid nano fluids and their underlying mechanisms. Abbreviations: SWCNH, single-walled carbon nano-horns; PAO, poly alpha olefin; MoS2, molybdenum di sulphide; H, Hamaker constant, MWCNTs, multi-walled carbon nanotubes; GNF, graphene nanoflakes; DLVO, Derjaguin and Landau Verway and Overbeek; DLS, dynamic light scattering; HLB, hydrophobic lyophilic balance; FERTEM, freeze etching replication transmission electron microscope; SDS, sodium dodecyl sulphate; PTFE, polytetrafluoroethylene; FTIR, Fourier-transform infrared spectroscopy; TBAAc, tetra butyl ammonium acetate; THF, tetrahydrofurane; UV–Vis, ultraviolet visible light; SEM, scanning electron microscope; TEM, transmission electron microscope GRAPHICAL ABSTRACT","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"16 1","pages":"34 - 56"},"PeriodicalIF":1.3,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49119351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-02DOI: 10.1080/17515831.2020.1854509
Y. Şahin, De Baets Patrick
ABSTRACT Effects of nano-Al2O3 and PTFE fillers on tribological behaviour of basalt fabric reinforced epoxy composite (BFRC) produced with a combination of molding and mixing method were studied by Taguchi L9 design. Microstructures and worn surfaces of composites were investigated by scanning electron microscopy. Regression equations were also developed for predicting wear and coefficient of friction. The results indicated that specific wear rate increased with increasing load and decreasing speed, but friction coefficient decreased with increasing speed, PTFE addition and medium load. In addition, wear rate of nano-PTFE was lower than that of nano-Al2O3 because of its microstructure. PTFE decreased the friction about 17%. Load was effective on the wear rate while speed was dominant on the friction. Moreover, multiple fiber fractures and large numbers of debris were dominated for BFRC while fiber debondings, fiber removals and debris agglomerations were effective for Al2O3, but fiber fractures and flake types of debris were responsible for PTFE. GRAPHICAL ABSTRACT
{"title":"Effects of nano-Al2O3 and PTFE fillers on tribological property of basalt fabric-reinforced epoxy composites","authors":"Y. Şahin, De Baets Patrick","doi":"10.1080/17515831.2020.1854509","DOIUrl":"https://doi.org/10.1080/17515831.2020.1854509","url":null,"abstract":"ABSTRACT Effects of nano-Al2O3 and PTFE fillers on tribological behaviour of basalt fabric reinforced epoxy composite (BFRC) produced with a combination of molding and mixing method were studied by Taguchi L9 design. Microstructures and worn surfaces of composites were investigated by scanning electron microscopy. Regression equations were also developed for predicting wear and coefficient of friction. The results indicated that specific wear rate increased with increasing load and decreasing speed, but friction coefficient decreased with increasing speed, PTFE addition and medium load. In addition, wear rate of nano-PTFE was lower than that of nano-Al2O3 because of its microstructure. PTFE decreased the friction about 17%. Load was effective on the wear rate while speed was dominant on the friction. Moreover, multiple fiber fractures and large numbers of debris were dominated for BFRC while fiber debondings, fiber removals and debris agglomerations were effective for Al2O3, but fiber fractures and flake types of debris were responsible for PTFE. GRAPHICAL ABSTRACT","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"15 1","pages":"258 - 277"},"PeriodicalIF":1.3,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43190030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-01DOI: 10.1080/17515831.2021.1951543
K. Uday Venkat Kiran, B. Ratna Sunil, R. Dumpala
ABSTRACT Ni–P–BN(h)–Ag hybrid composite coatings were fabricated on the steel substrate by a scalable electroless deposition process. The optimum bath composition and operating conditions were selected to obtain defect-free composite coatings with ∼50 μm thickness. Further, to enhance the hardness, as-deposited coatings were subjected to heat treatment in a tubular furnace at 400°C for 1 h. The dry sliding wear behaviour of the as-deposited (AD) and heat-treated (HT400) composite coatings was evaluated using a linear reciprocating tribometer. The average friction coefficient of the hybrid coating was ∼0.14 (in as-deposited condition) and ∼0.16 (in heat-treated condition); these values represent 51.72% and 52.94% reduction over non-hybrid Ni-P coatings. The specific wear rate of the as-deposited and heattreated composite coatings was found to be 50% and 43% lower, respectively, than that of conventional Ni–P coatings. Detailed wear track analysis was carried out to identify underlying wear mechanisms and tribochemical interactions. GRAPHICAL ABSTRACT
{"title":"Friction and wear behaviour of BN(h) and Ag incorporated nickel phosphorous coatings under dry reciprocating sliding conditions","authors":"K. Uday Venkat Kiran, B. Ratna Sunil, R. Dumpala","doi":"10.1080/17515831.2021.1951543","DOIUrl":"https://doi.org/10.1080/17515831.2021.1951543","url":null,"abstract":"ABSTRACT\u0000 Ni–P–BN(h)–Ag hybrid composite coatings were fabricated on the steel substrate by a scalable electroless deposition process. The optimum bath composition and operating conditions were selected to obtain defect-free composite coatings with ∼50 μm thickness. Further, to enhance the hardness, as-deposited coatings were subjected to heat treatment in a tubular furnace at 400°C for 1 h. The dry sliding wear behaviour of the as-deposited (AD) and heat-treated (HT400) composite coatings was evaluated using a linear reciprocating tribometer. The average friction coefficient of the hybrid coating was ∼0.14 (in as-deposited condition) and ∼0.16 (in heat-treated condition); these values represent 51.72% and 52.94% reduction over non-hybrid Ni-P coatings. The specific wear rate of the as-deposited and heattreated composite coatings was found to be 50% and 43% lower, respectively, than that of conventional Ni–P coatings. Detailed wear track analysis was carried out to identify underlying wear mechanisms and tribochemical interactions. GRAPHICAL ABSTRACT","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"16 1","pages":"23 - 33"},"PeriodicalIF":1.3,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44697321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-30DOI: 10.1080/17515831.2021.1964876
J. Jaramillo, J. C. Sánchez, J. F. Santa, M. Palacio, A. Toro
ABSTRACT The influence of the initial surface roughness on the wheel–rail contact has been a concern for railway systems especially since the introduction of rail grinding and wheel reprofiling as maintenance strategies. Currently, there are no universally accepted procedures for surface finishing of rails and wheels, so there is a need to keep studying the role of surface topography in reducing the maintenance costs and improving the wheel–rail system’s performance. This work studies the evolution of roughness of wheel samples during twin-disc tests performed to simulate wheel–rail contact up to 2.2 × 105 cycles under two different lubrication conditions. The results showed that under dry conditions the surfaces with larger kurtosis at the beginning of the tests had a better response to rolling contact fatigue. Under lubricated conditions, however, the effect of the initial roughness was less significant. GRAPHICAL ABSTRACT
{"title":"Roughness evolution of wheel surface in a simulated wheel–rail contact","authors":"J. Jaramillo, J. C. Sánchez, J. F. Santa, M. Palacio, A. Toro","doi":"10.1080/17515831.2021.1964876","DOIUrl":"https://doi.org/10.1080/17515831.2021.1964876","url":null,"abstract":"ABSTRACT The influence of the initial surface roughness on the wheel–rail contact has been a concern for railway systems especially since the introduction of rail grinding and wheel reprofiling as maintenance strategies. Currently, there are no universally accepted procedures for surface finishing of rails and wheels, so there is a need to keep studying the role of surface topography in reducing the maintenance costs and improving the wheel–rail system’s performance. This work studies the evolution of roughness of wheel samples during twin-disc tests performed to simulate wheel–rail contact up to 2.2 × 105 cycles under two different lubrication conditions. The results showed that under dry conditions the surfaces with larger kurtosis at the beginning of the tests had a better response to rolling contact fatigue. Under lubricated conditions, however, the effect of the initial roughness was less significant. GRAPHICAL ABSTRACT","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"16 1","pages":"188 - 201"},"PeriodicalIF":1.3,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44979696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-25DOI: 10.1080/17515831.2021.1964877
Lylia Aouchiche, A. Alhussein, M. Nechiche, D. Retraint, S. Amirouche, S. Azem
ABSTRACT In this paper, we present the synthesis of a Co–WC compound with 80% of cobalt in a single step by sintering powders compacted and previously milled for 10 h. The purpose of this work is to obtain a fine structure avoiding the formation of mixed carbides and reducing the WC/WC interfaces. The original powder mixture contained 80 wt% Co, 13 wt% W and 7 wt% C. The Co–20% WC metal matrix composite was successfully synthesized with a very fine and homogeneous structure. It presented a good wear resistance and showed that increasing the applied load from 5 to 10 N led to decrease the friction coefficient from 0.52 to 0.35 (sample speed = 10 cm/s) and from 0.90 to 0.61 (sample speed = 20 cm/s). The hardness and Young’s modulus of Co phase and WC grains, measured by nanoindentation technique, were 0.78/79.9 and 5.78/164.6 GPa, respectively. GRAPHICAL ABSTRACT
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