Tribology Letters最新文献

{"title":"The Effect of Temperature on the Current-Carrying Tribological Behaviour of C/Cu Contact Pairs in High Humidity Environments","authors":"De-Hui Ji,&nbsp;Li Xiao,&nbsp;Qiang Hu,&nbsp;Siyang Chen,&nbsp;Qiuping Li,&nbsp;Mingxue Shen","doi":"10.1007/s11249-024-01856-2","DOIUrl":"10.1007/s11249-024-01856-2","url":null,"abstract":"<div><p>The environmental temperature alters the frictional behaviour by changing the state of the current-carrying contact interface, which makes the electrical contact invalid. In this work, the effects of three different temperatures (− 20, 0, 20 °C) on the current-carrying tribological behaviour of C–Cu tribo-pairs in high humidity environment (85%) were discussed. The evolution laws of friction coefficient, wear volume, contact surface properties, and contact resistance of tribo-pairs were studied, and the current-carrying wear mechanism of C–Cu at low temperature was analyzed in depth. The variation of friction coefficient with temperature shows a similar rule before and after current-carrying, that is, regardless of the current, the friction coefficient increases as temperature falls. However, the average friction coefficient at each temperature is lower than that without current. Although it will hasten the material surface's oxidation, a drop in temperature will effectively lessen the transfer behaviour of copper to carbon surface and reduce the wear volume of carbon materials. The amount of copper transferred increases as current rises. Compared with current, the change of temperature has a greater impact on the damage of tribo-pairs. At room temperature, the contact resistance under high current is greater than that of low current. However, the rule is just the opposite under low temperature (0 and − 20 °C). In addition, at 0 °C, although the contact resistance of low current (5 A) decreases significantly in the early stage of friction, its average resistance and fluctuation amplitude are the largest. As the temperature decreases, the current-carrying wear mechanism of C–Cu contact pairs gradually changes from adhesive wear to fatigue wear.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"72 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140927517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of Lubricity of Calcium Sulfonate on ZnDTP and MoDTC","authors":"Yumi Hayashi,&nbsp;Kaisei Sato,&nbsp;Shinya Sasaki","doi":"10.1007/s11249-024-01860-6","DOIUrl":"10.1007/s11249-024-01860-6","url":null,"abstract":"<div><p>Reduction of friction and wear by lubrication is necessary to improve the efficiency and prolong the lifespan of industrial machinery. However, several aspects regarding the lubrication effects in additive-combined oil are still unresolved. This study focuses on the effects of combining zinc dialkyldithiophosphate (ZnDTP), molybdenum dithiocarbamate (MoDTC), and Ca sulfonate on the frictional behavior of poly-α-olefin 4 (PAO4) lubricant oils. Ball-on-disk friction tests demonstrated that the exclusive addition of high-base Ca sulfonate solution reduced friction and wear of the lubricating oil. When combined with ZnDTP and MoDTC, the friction coefficients of PAO with high-base and low-base Ca sulfonate are affected by competitive reactions on the sliding surface. Quartz crystal microbalance with dissipation monitoring measurements suggests that high-base Ca sulfonate forms a stronger adsorption film than low-base Ca sulfonate. Atomic force microscope observations confirmed that the addition of low-base Ca sulfonate reduced friction and wear, whereas high-base Ca sulfonate induced competitive reactions with ZnDTP and MoDTC. This study provides valuable insights into the effects of the combination of additives on the lubricity of PAO and their impact on friction and wear characteristics, which are valuable for the design of suitable lubricants for industrial machinery.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"72 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-024-01860-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to: Roughness Evolution Induced by Third-Body Wear","authors":"Joaquin Garcia-Suarez,&nbsp;Tobias Brink,&nbsp;Jean-François Molinari","doi":"10.1007/s11249-024-01864-2","DOIUrl":"10.1007/s11249-024-01864-2","url":null,"abstract":"","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"72 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-024-01864-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142407422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical and Experimental Study of a Sector-Shaped Surface Texture in Friction Reduction","authors":"Yuan Wei,&nbsp;Haoming Yan,&nbsp;Shuang Li,&nbsp;Xuewen Wang","doi":"10.1007/s11249-024-01863-3","DOIUrl":"10.1007/s11249-024-01863-3","url":null,"abstract":"<div><p>Reducing friction using lubricant is of great significance to reducing energy consumption and extending the life of machinery. Surface texturing is effective to enhance the lubrication condition, and it is crucial to properly design the texture’s morphology. In this study, a sector-shaped surface texture is designed and demonstrated using both numerical and experimental methods. A computational fluid dynamic method based on Navier–Stokes equations and a two-phase cavitation model is performed to evaluate the effect of the texture in the hydrodynamic lift and to optimize the geometrical parameters of the texture. The mechanism associated with the additional hydrodynamic pressure generation is also revealed according to the results of the simulation. Then, pin-on-disk rotary friction experiments are performed on steel disks textured by a femtosecond laser to verify the lubricant effect of the proposed texture. The results of the experiment suggest that the sector-shaped textures reduce friction more than conventional circle-shaped textures, which coincides well with the results of the simulation.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"72 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140889591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tribological Investigations on Additively Manufactured Inconel 718 Features with Silicon Carbide Ball: Role of the Tribo-Oxide Layer","authors":"M. M. Basha,&nbsp;M. R. Sankar,&nbsp;T. S. R. Ch. Murthy,&nbsp;A. K. Sahu,&nbsp;S. Majumdar","doi":"10.1007/s11249-024-01858-0","DOIUrl":"10.1007/s11249-024-01858-0","url":null,"abstract":"<div><p>The current investigation delved into the friction and wear characteristics of abrasive-finished Inconel 718 alloys fabricated by additive manufacturing and casting methods. Silicon carbide balls were used as counter-body materials for all tribology tests. Variable loads of 10 N, 20 N, and 30 N were applied, along with frequencies of 5 Hz and 15 Hz, while maintaining a 1 mm stroke length for 30 min. Cast samples showed an increase in coefficient of friction (COF) when the load increased from 10 to 20 N at 5 Hz. COF value was decreased from 0.28 to 0.25 when the load was increased from 20 to 30 N while the frequency was maintained at 5 Hz. At the same frequency of 5 Hz, additively manufactured samples displayed a constant increase in COF from 0.19 to 0.35 as the load increased from 10 to 30 N. Consistent COF values were determined at 15 Hz for cast and additively manufactured samples. The COF for cast samples at a frequency of 15 Hz was 0.26, 0.25, and 0.25 for loads of 10 N, 20 N, and 30 N, respectively. For the same loads and frequencies, COF values of 0.23, 0.24, and 0.24 were reported in additively manufactured samples. At 15 Hz, both cast (7.25 × 10^–6 mm³/N.m to 9.91 × 10^–6 mm³/N.m) and additively manufactured (5.80 × 10^–6 mm³/N.m to 6.18 × 10^–6 mm³/N.m) samples exhibited constant increasing trends of specific wear rates when the loads increased from 10 to 30 N.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"72 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140834079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of Stiffness on Friction, Surface Strain and Contact Area of a Sliding Finger Pad Simulant","authors":"Zing Siang Lee,&nbsp;Raman Maiti,&nbsp;Matt Carré,&nbsp;Roger Lewis","doi":"10.1007/s11249-024-01861-5","DOIUrl":"10.1007/s11249-024-01861-5","url":null,"abstract":"<div><p>This study investigates the frictional and surface strain behaviour of silicone hemispherical finger pad simulants with different stiffness during tribological interactions with a smooth glass plate. A novel contact area and strain measurement method employing a digital image correlation technique was employed to give new understanding of the pad behaviour during sliding. The frictional behaviour of the sliding finger pad simulant is dominated by the adhesion mechanism, with a small overall contribution from deformation, as suggested by the high principal strains at the edge of the contact area. The strain behaviour is also influenced by the magnitude of the normal force and the stiffness of the samples.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"72 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-024-01861-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140833994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Nickel Acetyl Acetonate as Lubricant Additive in Base Oils with Different Molecular Structure on In-Situ Formation and Tribomechanism of Carbon-Based Tribofilms of Steel-Steel Sliding Pair","authors":"Feng Peng,&nbsp;Shuguang Fan,&nbsp;Ningning Song,&nbsp;Chuanping Gao,&nbsp;Shengmao Zhang,&nbsp;Yujuan Zhang","doi":"10.1007/s11249-024-01859-z","DOIUrl":"10.1007/s11249-024-01859-z","url":null,"abstract":"<div><p>Nickel acetyl acetonate (Ni(acac)₂), a metal-organic compound, was directly dispersed in base oils alkylated naphthalene (AN-5), diisooctyl sebacate (DIOS), poly-α-olefin (PAO6), and mineral oil (liquid hydrocarbon mixtures:150 N) in the presence of commercial dispersant RF1151 (monoallyl poly(isobutylene succinimide). The tribological properties of the lubricants were tested with a four-ball friction and wear tester. The friction-induced in-situ formation of carbon films on rubbed steel surfaces under the catalysis of Ni(acac)₂ was investigated, and the as-formed carbon films were characterized by scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The results show that Ni(acac)₂ added in the base oils can decompose to form metallic nickel to form nickel layer on the rubbed metal sub-surfaces and catalyze the degradation of the base oil molecules adsorbed to form carbon-based tribofilms. The carbon film formed from AN-5 with aromatic ring structure has a high degree of graphitization and the best friction-reducing and antiwear abilities, and those formed from PAO6 and 150 N with linear structure have a low degree of graphitization as well as good tribological properties. Under the lubrication of DIOS with Ni(acac)₂, however, there is no carbon film formation while the tribological properties of the lubricant are relatively poor, due to the absence of the catalytic metallic nickel and nickel oxide layer on the rubbed metal sub-surface. Thanks to the catalytic effect of metallic nickel released from Ni(acac)₂ for the degradation of various base oils with different molecular structure, the present approach could provide a rational pathway to tune the in-situ formation of carbon-based tribofilm on rubbed steel surfaces so as to effectively reduce the friction and wear of steel-steel sliding pair.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"72 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140657778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Commensurability-Dependent Phononic Superlubricity Between Molybdenum Disulfide Layers","authors":"Yun Dong,&nbsp;Bo Shi,&nbsp;Yi Tao,&nbsp;Xinyi Tang,&nbsp;Jinguang Wang,&nbsp;Yifan Liu,&nbsp;Futian Yang","doi":"10.1007/s11249-024-01850-8","DOIUrl":"10.1007/s11249-024-01850-8","url":null,"abstract":"<p>This paper decodes the dependence of phononic superlubricity on commensurability caused by relative rotation between molybdenum disulfide (MoS₂) layers. Results show that under commensurate state, due to the strong interfacial potential, the sliding probe exhibits obvious stick–slip phenomenon; the vibration frequencies of the probe and the substrate are coupled, constructing effective energy transfer channels. As the rotation angle increases, the stick–slip phase and probe inherent oscillation are coupled owing to the decreasing interfacial potential. Once the contacting state reaches to completely incommensurability, the probe only undergoes inherent oscillation. More importantly, we further find that the potential period is determined by the lattice period, which causes the frequency distribution of the excited phonons to remain unchanged although changes in rotation angle. In addition, the contribution of atoms adjacent to friction interface to frictional energy dissipation becomes more significant with the rotation angle increasing. These findings reveal the phononic mechanism of angle-dependent superlubricity between MoS₂ layers and provide a viable approach for friction regulation.</p>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"72 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140655537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the Roles of Protein on the Cobalt Alloy Surface Degradation for Biomedical Implant Through Tribocorrosion Mechanisms","authors":"Mohamad Taufiqurrakhman,&nbsp;Thawhid Khan,&nbsp;Michael G. Bryant","doi":"10.1007/s11249-024-01862-4","DOIUrl":"10.1007/s11249-024-01862-4","url":null,"abstract":"<div><p>Previous investigation has established the formation of tribofilm is influenced by tribochemical reactions between the electrolyte and the articulating surface of cobalt alloy through sliding tests in various simulated fluids. Although it has successfully characterized the film composition via spectroscopy analysis and indicated to have impact on material loss, a comprehensive understanding of the material degradation mechanism in tribocorrosion condition was still lacking. Therefore, this study aims to investigate the role of protein in the tribocorrosive degradation of cobalt-chromium-molybdenum (CoCrMo) alloy in different simulated physiological electrolytes. Using a similar testing protocol, tribocorrosion tests were conducted with reciprocating ceramic ball against CoCrMo samples immersed in saline and culture medium, compared to both electrolytes diluted with 25% fetal bovine serum (FBS). Synergistic and mechanistic approaches were employed to model the tribocorrosive degradation. Results reveal that protein plays a beneficial role in reducing corrosive (electrochemical) surface degradation under tribocorrosion condition, whilst increasing mechanical wear degradation in the process. Despite studies have shown that tribocorrosion behavior in metal alloys is highly influenced by the presence of organic matter, this study provides a more clarity of the roles played by protein in tribocorrosive degradation on CoCrMo surface as its novel finding.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"72 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-024-01862-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140662127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single-Bubble Cavitation-Induced Pitting on Technical Alloys","authors":"Jonas Kühlmann,&nbsp;Sebastian A. Kaiser","doi":"10.1007/s11249-024-01851-7","DOIUrl":"10.1007/s11249-024-01851-7","url":null,"abstract":"<div><p>Repeated single cavitation bubble experiments were performed primarily on 316L stainless steel, and some on nickel–aluminum–bronze (NAB) and pure aluminum. The bubble dynamics were recorded with two high-speed cameras and correlated with surface images, also acquired in situ. These experiments were performed for a range of stand-off distances <i>γ</i> (the ratio of the distance of the solid surface from the bubble to the bubble’s maximum radius) from 0.3 to 2.15. For all stand-off distances, single pits were the only surface change detected at the beginning of damage formation. Later phases of the collapse are not axisymmetric but show regions of “stronger” collapse, and the pits occur on the material underneath those regions. For <i>γ</i> &lt; 0.4, the damage is attributed to the second collapse. For <i>γ</i> &gt; 0.4, the first bubble collapse is most likely responsible for pitting. Shock-wave emission was detected from the collapse regions that were linked to the damage. On 316L, the pitting rate was found to be linearly dependent on the bubble radius, indicating a non-zero lower limit for the bubble radius below which pits do not occur. In terms of stand-off distance, the pitting rate (defined here as average pits per bubble) was non-monotonic, with maxima for bubbles initiated closest to the sample (<i>γ</i> = 0.3) and at <i>γ</i> = 1.4.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"72 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-024-01851-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140665901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}