Pub Date : 2020-10-10DOI: 10.1080/17515831.2020.1829877
A. Mazzù, A. Ghidini, N. Zani, M. Faccoli
ABSTRACT The effect of material plastic properties in solid-contaminated wheel-rail couplings was studied by simplified finite element models, considering typical couplings of steels following European and American standards. Analyses of non-contaminated contact were performed for comparison. It resulted that in clean contact there is a reciprocal influence, in terms of plastic strain, between the mechanical properties of both contacting bodies. By contrast, in solid-contaminated contact the performance of each contacting body depends mainly on its own properties. A zone of influence of the local contact between the contaminant particles and the main bodies was identified and compared with the damage observed in previous experimental results. Despite the simplifications of the numerical model, this zone can be visibly identified in harder materials and appeared to match the numerically estimated one. In softer materials, owing to the high strain even in the overall contact region, this zone could not be identified. GRAPHICAL ABSTRACT
{"title":"A simplified numerical study of wheel/rail material coupling in presence of solid contaminants","authors":"A. Mazzù, A. Ghidini, N. Zani, M. Faccoli","doi":"10.1080/17515831.2020.1829877","DOIUrl":"https://doi.org/10.1080/17515831.2020.1829877","url":null,"abstract":"ABSTRACT The effect of material plastic properties in solid-contaminated wheel-rail couplings was studied by simplified finite element models, considering typical couplings of steels following European and American standards. Analyses of non-contaminated contact were performed for comparison. It resulted that in clean contact there is a reciprocal influence, in terms of plastic strain, between the mechanical properties of both contacting bodies. By contrast, in solid-contaminated contact the performance of each contacting body depends mainly on its own properties. A zone of influence of the local contact between the contaminant particles and the main bodies was identified and compared with the damage observed in previous experimental results. Despite the simplifications of the numerical model, this zone can be visibly identified in harder materials and appeared to match the numerically estimated one. In softer materials, owing to the high strain even in the overall contact region, this zone could not be identified. GRAPHICAL ABSTRACT","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"15 1","pages":"102 - 114"},"PeriodicalIF":1.3,"publicationDate":"2020-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/17515831.2020.1829877","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46096625","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 : 2020-10-01DOI: 10.1080/17515831.2020.1825062
I. Bodini, C. Petrogalli, A. Mazzù, S. Pasinetti, T. Kato, T. Makino
ABSTRACT A vision-based experimental methodology was developed for monitoring the surface state evolution of specimens during twin-disc rolling contact tests, aimed at providing information for identifying the damage phenomena. The system is based on a high-speed camera and three laser pointers for illuminating the specimen surface. Images of the specimen surface are acquired and processed, allowing the definition of synthetic surface state indexes, as well as the section profiles of the surface. The vision system was applied to alternated dry–wet rolling–sliding contact tests on railway wheel steel specimens, highlighting its effectiveness in the damage evaluation. The potential of the section profile reconstruction as a tool for surface topology analysis was shown.
{"title":"A vision-based approach for rolling contact fatigue evaluation in twin-disc tests on a railway wheel steel","authors":"I. Bodini, C. Petrogalli, A. Mazzù, S. Pasinetti, T. Kato, T. Makino","doi":"10.1080/17515831.2020.1825062","DOIUrl":"https://doi.org/10.1080/17515831.2020.1825062","url":null,"abstract":"ABSTRACT A vision-based experimental methodology was developed for monitoring the surface state evolution of specimens during twin-disc rolling contact tests, aimed at providing information for identifying the damage phenomena. The system is based on a high-speed camera and three laser pointers for illuminating the specimen surface. Images of the specimen surface are acquired and processed, allowing the definition of synthetic surface state indexes, as well as the section profiles of the surface. The vision system was applied to alternated dry–wet rolling–sliding contact tests on railway wheel steel specimens, highlighting its effectiveness in the damage evaluation. The potential of the section profile reconstruction as a tool for surface topology analysis was shown.","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"15 1","pages":"92 - 101"},"PeriodicalIF":1.3,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/17515831.2020.1825062","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44403718","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 : 2020-09-03DOI: 10.1080/17515831.2020.1812246
S. Jakovljević, D. Landek, P. Simeon
ABSTRACT The purpose of this investigation was to compare the wear of diamond-coated dental burs applied on specimens made of four different materials used in dental prosthetics. Cutting was performed using a dental air turbine handpiece. Identical coarse-grit diamond burs were mounted on the handpiece and subjected to a 1.5 N load. Dental burs were divided into four groups according to the type of material on which the cutting was performed (leucite glass ceramic, zirconium oxide, CoCrMo alloy and polymethylmethacrylate). The wear of the dental burs was determined as the amount of their weight loss during different time intervals. After each time interval, all the burs were cleaned, weighed, and analysed by an SEM. The greatest bur weight loss was measured in the group of dental burs used to perform cutting on the ZrO2 specimen, while the smallest weight loss was measured in the group used on the polymethylmethacrylate specimen.
{"title":"Tribological behaviour of dental diamond burs after different exploitation times","authors":"S. Jakovljević, D. Landek, P. Simeon","doi":"10.1080/17515831.2020.1812246","DOIUrl":"https://doi.org/10.1080/17515831.2020.1812246","url":null,"abstract":"ABSTRACT The purpose of this investigation was to compare the wear of diamond-coated dental burs applied on specimens made of four different materials used in dental prosthetics. Cutting was performed using a dental air turbine handpiece. Identical coarse-grit diamond burs were mounted on the handpiece and subjected to a 1.5 N load. Dental burs were divided into four groups according to the type of material on which the cutting was performed (leucite glass ceramic, zirconium oxide, CoCrMo alloy and polymethylmethacrylate). The wear of the dental burs was determined as the amount of their weight loss during different time intervals. After each time interval, all the burs were cleaned, weighed, and analysed by an SEM. The greatest bur weight loss was measured in the group of dental burs used to perform cutting on the ZrO2 specimen, while the smallest weight loss was measured in the group used on the polymethylmethacrylate specimen.","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"15 1","pages":"159 - 168"},"PeriodicalIF":1.3,"publicationDate":"2020-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/17515831.2020.1812246","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43106788","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 : 2020-07-12DOI: 10.1080/17515831.2020.1785234
J. Romano, Jorge Fantova Sarasa, C. Concheso, Mert Gulcur, B. Dashtbozorg, A. Garcia-Giron, P. Penchev, H. Dong, B. Whiteside, S. Dimov
ABSTRACT The mass production of polymeric parts with functional surfaces requires economically viable manufacturing routes. Injection moulding is a very attractive option, however, wear and surface damage can be detrimental to the lifespan of replication masters. In this research, austenitic stainless steel inserts were hardened by low temperature plasma carburising and then different micro and nano scale surface textures, inspired by Lotus leaves and Springtail skins, were laser fabricated. A commonly available talc-loaded polypropylene was used to produce 5000 replicas and thus to investigate the evolution of surface textures both on inserts and replicas together with their functional response. The progressive wear or surface damage on the inserts during the injection moulding process had a clear impact on surface roughness and peak-to-peak topographies of the replicas. In general, polymer replicas produced with the carburised inserts retained wetting properties for longer periods compared with those produced with the untreated replication masters.
{"title":"Effects of mould wear on hydrophobic polymer surfaces replicated using plasma-treated and laser-textured stainless steel inserts","authors":"J. Romano, Jorge Fantova Sarasa, C. Concheso, Mert Gulcur, B. Dashtbozorg, A. Garcia-Giron, P. Penchev, H. Dong, B. Whiteside, S. Dimov","doi":"10.1080/17515831.2020.1785234","DOIUrl":"https://doi.org/10.1080/17515831.2020.1785234","url":null,"abstract":"ABSTRACT The mass production of polymeric parts with functional surfaces requires economically viable manufacturing routes. Injection moulding is a very attractive option, however, wear and surface damage can be detrimental to the lifespan of replication masters. In this research, austenitic stainless steel inserts were hardened by low temperature plasma carburising and then different micro and nano scale surface textures, inspired by Lotus leaves and Springtail skins, were laser fabricated. A commonly available talc-loaded polypropylene was used to produce 5000 replicas and thus to investigate the evolution of surface textures both on inserts and replicas together with their functional response. The progressive wear or surface damage on the inserts during the injection moulding process had a clear impact on surface roughness and peak-to-peak topographies of the replicas. In general, polymer replicas produced with the carburised inserts retained wetting properties for longer periods compared with those produced with the untreated replication masters.","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"14 1","pages":"240 - 252"},"PeriodicalIF":1.3,"publicationDate":"2020-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/17515831.2020.1785234","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43386703","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 : 2020-07-07DOI: 10.1080/17515831.2020.1785232
P. Singh, S. Mishra
ABSTRACT Thermal spray coatings are used to improve the erosion resistance of boilers and turbine components for power plants and other industries. In this work, detonation gun spraying method is used to deposit WC-12Co, Stellite 6 and Stellite 21 coatings on SAE213-T12 boiler steel. The coatings were characterized using microhardness tester, scanning electron microscope (SEM), optical microscope and X-ray diffractometer (XRD). The solid particle erosion behaviours of the coatings were evaluated at 30° and 90° impact angles using an air jet erosion test rig. The erosion rates of Stellite 6 and Stellite 21 coatings are found approximately 60% and 50% respectively higher than WC–Co coating, which might be attributed to the respective hardness of the coatings. Cobalt content in the coatings played an important role on the erosion behaviour of the coatings. The erosion mechanisms of the coatings involved micro-ploughing, micro-cutting along with some micro-cracking and hard phase pull-outs.
{"title":"Erosion performance of detonation gun deposited WC–12Co, Stellite 6 and Stellite 21 coatings on SAE213-T12 steel","authors":"P. Singh, S. Mishra","doi":"10.1080/17515831.2020.1785232","DOIUrl":"https://doi.org/10.1080/17515831.2020.1785232","url":null,"abstract":"ABSTRACT Thermal spray coatings are used to improve the erosion resistance of boilers and turbine components for power plants and other industries. In this work, detonation gun spraying method is used to deposit WC-12Co, Stellite 6 and Stellite 21 coatings on SAE213-T12 boiler steel. The coatings were characterized using microhardness tester, scanning electron microscope (SEM), optical microscope and X-ray diffractometer (XRD). The solid particle erosion behaviours of the coatings were evaluated at 30° and 90° impact angles using an air jet erosion test rig. The erosion rates of Stellite 6 and Stellite 21 coatings are found approximately 60% and 50% respectively higher than WC–Co coating, which might be attributed to the respective hardness of the coatings. Cobalt content in the coatings played an important role on the erosion behaviour of the coatings. The erosion mechanisms of the coatings involved micro-ploughing, micro-cutting along with some micro-cracking and hard phase pull-outs.","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"14 1","pages":"229 - 239"},"PeriodicalIF":1.3,"publicationDate":"2020-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/17515831.2020.1785232","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45869272","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 : 2020-06-26DOI: 10.1080/17515831.2020.1785233
W. K. Shafi, M. Charoo
ABSTRACT Nanolubrication is one of the recent innovative technologies used in lubrication science. It involves dispersion of various types of nanoparticles in different concentrations in the conventional lubricant and studies the tribological properties of these lubricants on a particular tribopair under different operating parameters. Nanoparticles can be considered as potential lubricant additives. They present several major advantages compared to organic molecules currently used as lubricant additives, which include their nanometre size allowing them to enter the contact area easily. The real contact area is decreased when nanoparticles are entrapped between the mating surfaces. They are often efficient at ambient temperature. Thus, no induction period is necessary to obtain interesting tribological properties. Further, nanoadditives also improve the thermo-physical properties of the lubricant. A comprehensive review is provided with the aim to analyse and explore tribological and thermo-physical properties of nanolubricants on various tribopairs used for engineering applications. Recent advancements like hybrid nanofluids and biolubrication are also discussed that further provides the solutions for sustainable lubrication.
{"title":"An overall review on the tribological, thermal and rheological properties of nanolubricants","authors":"W. K. Shafi, M. Charoo","doi":"10.1080/17515831.2020.1785233","DOIUrl":"https://doi.org/10.1080/17515831.2020.1785233","url":null,"abstract":"ABSTRACT Nanolubrication is one of the recent innovative technologies used in lubrication science. It involves dispersion of various types of nanoparticles in different concentrations in the conventional lubricant and studies the tribological properties of these lubricants on a particular tribopair under different operating parameters. Nanoparticles can be considered as potential lubricant additives. They present several major advantages compared to organic molecules currently used as lubricant additives, which include their nanometre size allowing them to enter the contact area easily. The real contact area is decreased when nanoparticles are entrapped between the mating surfaces. They are often efficient at ambient temperature. Thus, no induction period is necessary to obtain interesting tribological properties. Further, nanoadditives also improve the thermo-physical properties of the lubricant. A comprehensive review is provided with the aim to analyse and explore tribological and thermo-physical properties of nanolubricants on various tribopairs used for engineering applications. Recent advancements like hybrid nanofluids and biolubrication are also discussed that further provides the solutions for sustainable lubrication.","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"162 6","pages":"20 - 54"},"PeriodicalIF":1.3,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/17515831.2020.1785233","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41275369","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 : 2020-06-16DOI: 10.1080/17515831.2020.1777759
W. Mohamad, A. Khan, P. Barroy, O. Durand-Drouhin, Clément Puille, A. Lahmar, F. Ahmad
ABSTRACT Ni-Cr based composites with and without the addition of solid lubricants (MoS2, Ag and CaF2) were prepared by powder metallurgy method. The samples were sintered at 1200°C in flowing argon atmosphere for 1 h. The physical properties such as sintered density, relative density and porosity were studied. The microstructures and phase studies of the Ni-Cr based composites were conducted using SEM analysis while the hardness of the composites were measured by Vickers Micro Hardness Tester. The friction tests were conducted with ball on disc configuration following ASTM G-99-95a standard. The MoS2 solid lubricant provides best lubrication at room temperature which is demonstrated by a low friction coefficient compared to pure Ni-Cr composites (0.176 compared to 0.394). The SEM pictures of worn out showed into evidence plastic deformation, solid debris distribution, and filling of pores with solid lubricant phases. The time taken for stabilization of friction coefficient also varies with the type of solid lubricant. Dual and multiple addition of solid lubricants are also able to reduce the friction of coefficient compared to pure Ni-Cr composite. SEM analysis shows the spreading of solid lubricant/s during the sliding test to provide lubrication to both contacting metals.
{"title":"Microstructure and surface characterization of Ni-Cr based composites containing variable solid lubricants","authors":"W. Mohamad, A. Khan, P. Barroy, O. Durand-Drouhin, Clément Puille, A. Lahmar, F. Ahmad","doi":"10.1080/17515831.2020.1777759","DOIUrl":"https://doi.org/10.1080/17515831.2020.1777759","url":null,"abstract":"ABSTRACT Ni-Cr based composites with and without the addition of solid lubricants (MoS2, Ag and CaF2) were prepared by powder metallurgy method. The samples were sintered at 1200°C in flowing argon atmosphere for 1 h. The physical properties such as sintered density, relative density and porosity were studied. The microstructures and phase studies of the Ni-Cr based composites were conducted using SEM analysis while the hardness of the composites were measured by Vickers Micro Hardness Tester. The friction tests were conducted with ball on disc configuration following ASTM G-99-95a standard. The MoS2 solid lubricant provides best lubrication at room temperature which is demonstrated by a low friction coefficient compared to pure Ni-Cr composites (0.176 compared to 0.394). The SEM pictures of worn out showed into evidence plastic deformation, solid debris distribution, and filling of pores with solid lubricant phases. The time taken for stabilization of friction coefficient also varies with the type of solid lubricant. Dual and multiple addition of solid lubricants are also able to reduce the friction of coefficient compared to pure Ni-Cr composite. SEM analysis shows the spreading of solid lubricant/s during the sliding test to provide lubrication to both contacting metals.","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"14 1","pages":"219 - 228"},"PeriodicalIF":1.3,"publicationDate":"2020-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/17515831.2020.1777759","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43120104","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 : 2020-05-23DOI: 10.1080/17515831.2020.1765611
Reuben Kempka, R. Falconer, D. Gutsulyak, R. Lewis
ABSTRACT A novel tribo-testing method using a pin-on-plate tribometer was developed to test and visualize the coefficient of friction over surfaces with oxides present to examine low adhesion issues. Tribo-test data was recorded each pass over test surfaces showing how friction changes with mechanical action. Trackside environmental monitoring and railhead swabbing was performed to investigate the physical and chemical environment of the railhead. Iron oxides were both synthesized on and deposited on rail steel substrates to simulate ‘wet-rail’ conditions. Powdered oxide layers of magnetite, haematite, goethite and lepidocrocite were deposited on rail steel substrates to investigate individual oxides. Composition was analysed using X-ray diffraction and scanning electron microscopy before testing. Magnetite, Haematite and Lepidocrocite were formed when water alone was applied to the surfaces. Low friction was observed on oxidized sample surfaces only outside high roughness, oxide pitted, areas, but these conditions were shown to be difficult to achieve and transient.
{"title":"Effects of oxide and water on friction of rail steel – new test method and friction mapping","authors":"Reuben Kempka, R. Falconer, D. Gutsulyak, R. Lewis","doi":"10.1080/17515831.2020.1765611","DOIUrl":"https://doi.org/10.1080/17515831.2020.1765611","url":null,"abstract":"ABSTRACT A novel tribo-testing method using a pin-on-plate tribometer was developed to test and visualize the coefficient of friction over surfaces with oxides present to examine low adhesion issues. Tribo-test data was recorded each pass over test surfaces showing how friction changes with mechanical action. Trackside environmental monitoring and railhead swabbing was performed to investigate the physical and chemical environment of the railhead. Iron oxides were both synthesized on and deposited on rail steel substrates to simulate ‘wet-rail’ conditions. Powdered oxide layers of magnetite, haematite, goethite and lepidocrocite were deposited on rail steel substrates to investigate individual oxides. Composition was analysed using X-ray diffraction and scanning electron microscopy before testing. Magnetite, Haematite and Lepidocrocite were formed when water alone was applied to the surfaces. Low friction was observed on oxidized sample surfaces only outside high roughness, oxide pitted, areas, but these conditions were shown to be difficult to achieve and transient.","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"15 1","pages":"80 - 91"},"PeriodicalIF":1.3,"publicationDate":"2020-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/17515831.2020.1765611","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43483975","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 : 2020-04-03DOI: 10.1080/17515831.2020.1746012
M. Bryant, J. R. Sin, N. Emami, A. Neville
ABSTRACT Cobalt-chromium-molybdenum alloys are commonly used for biomedical applications such as dental implants and joint implants. Once the material is implanted into the body it is exposed to the corrosiveness of biological fluids and, in some cases, to mechanical loading that can lead to the combined action of wear and corrosion; better known as tribocorrosion. The effect of four different simulated body fluids on the tribocorrosion behaviour of a CoCrMo alloy has been investigated. The degradation of the studied CoCrMo alloys due to tribocorrosion shows a great dependence on the chemical composition of the media. Phosphate-buffered saline (PBS)-based solutions tend to show higher mass loss than the solutions prepared with distilled water. Phosphates present in PBS tend to accumulate on the surface of the alloy and change its tribological performance. In addition, proteins show a lubricating effect reducing the coefficient of friction of the system in the boundary lubrication regime.
{"title":"Effect of proteins and phosphates on the degradation and repassivation of CoCrMo alloys under tribocorrosion conditions","authors":"M. Bryant, J. R. Sin, N. Emami, A. Neville","doi":"10.1080/17515831.2020.1746012","DOIUrl":"https://doi.org/10.1080/17515831.2020.1746012","url":null,"abstract":"ABSTRACT Cobalt-chromium-molybdenum alloys are commonly used for biomedical applications such as dental implants and joint implants. Once the material is implanted into the body it is exposed to the corrosiveness of biological fluids and, in some cases, to mechanical loading that can lead to the combined action of wear and corrosion; better known as tribocorrosion. The effect of four different simulated body fluids on the tribocorrosion behaviour of a CoCrMo alloy has been investigated. The degradation of the studied CoCrMo alloys due to tribocorrosion shows a great dependence on the chemical composition of the media. Phosphate-buffered saline (PBS)-based solutions tend to show higher mass loss than the solutions prepared with distilled water. Phosphates present in PBS tend to accumulate on the surface of the alloy and change its tribological performance. In addition, proteins show a lubricating effect reducing the coefficient of friction of the system in the boundary lubrication regime.","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"14 1","pages":"207 - 218"},"PeriodicalIF":1.3,"publicationDate":"2020-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/17515831.2020.1746012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48925363","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 : 2020-04-02DOI: 10.1080/17515831.2019.1675339
J. Katiyar, S. Sinha, T. Hirayama, Arvind Kumar
ABSTRACT SU-8 polymer with talc particle (30 wt-%) and liquid perfluoropolyether (PFPE) (30 wt-%) fillers was used as a composite to fabricate conical tip-cantilever device. The composite tip demonstrated lower coefficient of friction (∼0.22) when compared with a tip made of pure SU-8 (∼0.65). Fluorine was detected on the wear track and the tip surface, which resulted from the transfer of PFPE from the tip to the wear track. The counterface made of pure SU-8 remained smooth and unworn when slid against the composite tip even after 1000 cycles of sliding. This composite with improved tribological and mechanical properties can be used for fabricating small component devices such as for micro-electro-mechanical systems (MEMS).
{"title":"Tribological analysis of tip-cantilever made of SU-8, talc and PFPE composite","authors":"J. Katiyar, S. Sinha, T. Hirayama, Arvind Kumar","doi":"10.1080/17515831.2019.1675339","DOIUrl":"https://doi.org/10.1080/17515831.2019.1675339","url":null,"abstract":"ABSTRACT SU-8 polymer with talc particle (30 wt-%) and liquid perfluoropolyether (PFPE) (30 wt-%) fillers was used as a composite to fabricate conical tip-cantilever device. The composite tip demonstrated lower coefficient of friction (∼0.22) when compared with a tip made of pure SU-8 (∼0.65). Fluorine was detected on the wear track and the tip surface, which resulted from the transfer of PFPE from the tip to the wear track. The counterface made of pure SU-8 remained smooth and unworn when slid against the composite tip even after 1000 cycles of sliding. This composite with improved tribological and mechanical properties can be used for fabricating small component devices such as for micro-electro-mechanical systems (MEMS).","PeriodicalId":23331,"journal":{"name":"Tribology - Materials, Surfaces & Interfaces","volume":"14 1","pages":"101 - 92"},"PeriodicalIF":1.3,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/17515831.2019.1675339","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41520370","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}
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