Tribology International最新文献

{"title":"Bifunctional brush bionic lubricant for drug release and lubrication","authors":"Chenyang Gong,&nbsp;Ximing Cai,&nbsp;Dangsheng Xiong","doi":"10.1016/j.triboint.2025.111217","DOIUrl":"10.1016/j.triboint.2025.111217","url":null,"abstract":"<div><div>Osteoarthritis is a common disease of the elderly, and in recent years there is a trend of lower age, which seriously affects the quality of life of patients. Usually, for patients with early arthritis, the clinic will inject hyaluronic acid into the articular cavity to relieve the patient's joint pain and have the patient take oral medication to eliminate inflammation. However, some studies have shown that hyaluronic acid itself does not have a lubricating function, and oral anti-inflammatory drugs can not accurately reach the site of inflammation, low drug utilization, and high side effects. We simulated the molecular structure of natural lubricin and grafted cationic polyacrylamide onto the hyaluronic acid main chain through grafting reaction to form a biocompatible brush biomimetic lubricant containing multiple hydrophilic groups, which self-assembly of encapsulated drugs using its multibranched structure enables loading of small molecule drugs. In vitro drug release studies showed that the synthesized drug-loaded biomimetic lubricant has both drug-loading and drug-release capabilities, with a cumulative drug release rate of about 92 % at 120 h. In addition, tribological studies on the surfaces of natural cartilage and artificial joint materials show that the biomimetic lubricant has excellent lubrication effect, which is mainly due to the hydrophilic groups on the polymer molecular chain that can adsorb a large number of water molecules in the solution, form a hydration layer at the friction contact interface, and thereby exert a hydration lubrication effect. The synthesis of this bifunctional material with both drug release and lubrication effects provides a new strategy for the treatment of early osteoarthritis.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"214 ","pages":"Article 111217"},"PeriodicalIF":6.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108792","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}

{"title":"Synergistic effects of load, displacement, and temperature on fretting wear behavior of Ti6Al4V alloy in self-mated contacts at elevated temperatures","authors":"Abdur Razzak ,&nbsp;Sixiang Wang ,&nbsp;Weihai Xue ,&nbsp;Siyang Gao ,&nbsp;Bi Wu ,&nbsp;Deli Duan","doi":"10.1016/j.triboint.2025.111205","DOIUrl":"10.1016/j.triboint.2025.111205","url":null,"abstract":"<div><div>This study investigates fretting wear in Ti6Al4V (TC4/TC4) contacts under varying loads, displacements, and temperatures, simulating aero-engine components. A ball-on-flatbed setup assessed friction, wear rates, wear mechanisms, oxide/tribo layers, and crack behavior. Results demonstrate that higher loads and displacements reduce friction and wear. Maximum wear occurs at 400°C: abrasive/mild adhesive wear dominates at RT-300°C, transitioning to severe oxidative/delamination wear at 400°C, while stable oxide layers (mild oxidative wear) form at 600°C under lower loads. Higher loads/displacements deepen cracks (particularly at 600°C), accelerating thermally fatigue wear. High temperatures and mechanical stresses promote vertical crack propagation, while subsurface cracks form under lower loads. These findings reveal mechanical-thermal synergies, aiding aerospace wear resistance by optimizing conditions to stabilize oxides and mitigate cracking.’</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"214 ","pages":"Article 111205"},"PeriodicalIF":6.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145095455","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}

{"title":"Determination of pavement texture parameters for Persson's friction theory based on wear evolution considerations","authors":"Weiwei Guo ,&nbsp;Kai Huang ,&nbsp;Jiajian Xiong ,&nbsp;Runlin Jiang ,&nbsp;Yang Ming","doi":"10.1016/j.triboint.2025.111215","DOIUrl":"10.1016/j.triboint.2025.111215","url":null,"abstract":"<div><div>Pavement texture evolution under traffic wear critically influences skid resistance, yet existing Persson’s friction theory lacks validated parameters for dynamic texture changes. This study establishes novel approaches to determine key parameters, lower cutoff wavenumber q₁ and tire rubber-pavement contact ratio, aligned with wear progression. Experimental results demonstrate that (i) setting q₁ to 500 times the roll-off wavenumber q₀ outperforms the root-mean-square slope criterion for worn surfaces, yielding friction predictions consistent with experimental trends. (ii) The contact ratio, derived inversely from Persson’s friction theory, exhibits a strong negative linear correlation (R²=0.94) with the coefficient of friction and increases with wear severity. These parameters enable accurate friction prediction across pavement lifecycles, advancing non-contact skid resistance management.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"214 ","pages":"Article 111215"},"PeriodicalIF":6.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145095457","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}

{"title":"Macroscale superlubricity of weak hydrogen-bonded yam polysaccharide-polyethylene glycol complex with ultralow wear and enhanced load-bearing capacity","authors":"Songlin Nie,&nbsp;Li Shi,&nbsp;Hui Ji,&nbsp;Hao He,&nbsp;Fanglong Yin,&nbsp;Zhonghai Ma","doi":"10.1016/j.triboint.2025.111213","DOIUrl":"10.1016/j.triboint.2025.111213","url":null,"abstract":"<div><div>Macroscopic superlubricity has drawn attention for its potential to reduce friction and wear in engineering. In this study, a composite lubricant was developed by combining yam polysaccharide with polyethylene glycol. Superlubricity was achieved under 516.4 MPa pressure between 440 C stainless steel and SiC ceramic, with an average friction coefficient of 0.0051. Notably, the stainless steel showed a low wear rate of 1.291 × 10⁻⁸ mm³ ·N⁻¹ ·m⁻¹ after six hours and maintained performance even after 30 days of rest. This effect is attributed to the rigid structure of the polysaccharide backbone, which limits excessive hydrogen bonding and promotes the formation of a gradient film composed of inorganic, mixed, and organic layers during friction. These findings provide new insights into developing eco-friendly, water-based superlubrication systems.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"214 ","pages":"Article 111213"},"PeriodicalIF":6.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108796","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}

{"title":"Modified quasi-static analysis of angular contact ball bearing","authors":"Jing Guo ,&nbsp;Biao Ma ,&nbsp;Zhitao Cheng ,&nbsp;Honglin Xu ,&nbsp;Shenlong Li ,&nbsp;Tiangang Zou ,&nbsp;Fanming Meng","doi":"10.1016/j.triboint.2025.111198","DOIUrl":"10.1016/j.triboint.2025.111198","url":null,"abstract":"<div><div>This study proposes a modified quasi-static model (QSC) with the thermal deformation and elastohydrodynamic lubrication (EHL) effect for high-speed angular contact ball bearing. In doing so, the thermal deformation and central film thickness are incorporated into the QSC through thermal network method (TNM), and solved iteratively by using a quasi-Newton algorithm. The proposed method is validated. The comparison among the conventional quasi-static (QS), quasi-static model considering the hydrodynamic central film thickness (QSH) and QSC demonstrate that thermal deformation and EHL central film thickness significantly influence the contact angle, load distribution, and spin-rolling ratio at high rotational speed of bearing. Compared with the QS and QSH, more accurate predictions of contact load, centrifugal force, and ring displacement can be offered by the QSC, in which case it can provide a theoretical basis for the performance optimizing of high-speed bearing.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"214 ","pages":"Article 111198"},"PeriodicalIF":6.1,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108791","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}

{"title":"An efficient numerical solution for singular integral equation in applied mechanics: Application to frictional contact problem of layer & substrate structure","authors":"Kai Zhu ,&nbsp;Zhizhen Jiang ,&nbsp;Xiaoqing Jin","doi":"10.1016/j.triboint.2025.111194","DOIUrl":"10.1016/j.triboint.2025.111194","url":null,"abstract":"<div><div>An efficient numerical solution for singular integral equation of both first and second kinds is presented. Chebyshev polynomials are utilized to provide an explicit expression for the unknown function in itemized form. The Cauchy singular integral is eliminated through orthogonal properties. Based on a sampling scheme, method of collocation is proposed to discretize the integral equation and determine the coefficients of polynomials. FFT implementation facilitates rapid computation of the kernel which is in the form of convolution with high oscillation kernel. In scenario of frictional contact between stamp and layer-substrate system, the robustness is tested, and performance of sampling schemes counteracting singularity is examined. It reveals that, in comparison with previous numerical solution, the present numerical method is reliable and highly efficient.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"214 ","pages":"Article 111194"},"PeriodicalIF":6.1,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108797","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}

{"title":"Development of a high-performance lubricant based on halogen-free phosphonium ionic liquid for electrified vehicle transmissions","authors":"Mohamed Kamal Ahmed Ali ,&nbsp;Yijing Liang ,&nbsp;Yuchen Sun ,&nbsp;Chaoyang Zhang ,&nbsp;Qiangliang Yu ,&nbsp;Shuai Hu ,&nbsp;Feng Zhou ,&nbsp;Weimin Liu","doi":"10.1016/j.triboint.2025.111206","DOIUrl":"10.1016/j.triboint.2025.111206","url":null,"abstract":"<div><div>Electrified vehicle transmissions impose high demands on lubricating oils due to the electrification effects caused by stray currents. Therefore, this study aims to develop a high-performance, low-SAPS lubricant by synthesizing a halogen-free phosphonium-based ionic liquid (P_888 P-SP) additive that is added to PAO10 baseline oil at varying concentrations (0.5, 1.0, and 2.0 wt%). The formulated oil is then compared with a fully formulated automatic transmission fluid (ATF-EV). An SRV-IV tribometer was utilized for assessing the tribological performance at different DC levels (0, 3, 6, and 9 A) and sliding parameters. Herein, the main underlying mechanism of antiwear tribofilm formation on the electrified AISI 52100 surfaces is explored. The results demonstrated that the 2.0-P_888 P-SP oil achieved a 29 % and 43 % decline in the coefficient of friction (COF) compared with ATF-EV oil and PAO10 oil, respectively, under triboelectrification conditions at 9 A. Furthermore, the 2.0-P_888 P-SP oil decreased the wear volume of the tribosystem by 63 % and 79 % in comparison to ATF-EV oil and PAO10 oil, respectively. This improvement relates to the synergistic action and adaptability of the P_888 P-SP additive with electrification effects. These characteristics resulted in the tribofilm formation, with thickness ranging from 839 nm to 1.41 µm, thereby enhancing the durability of mechanical components. Ultimately, the halogen-free structure of P_888 P-SP contributes to its environmental compatibility, making it a promising candidate for use as a lubricant additive in electrified vehicle transmissions.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"214 ","pages":"Article 111206"},"PeriodicalIF":6.1,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145095870","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}

{"title":"Tribodynamic behavior of two-phase Casson fluid in a rectangular channel with thermal radiation, Hall current, and ion slip effects","authors":"Mariam Sheikh ,&nbsp;Fahad Saleh Almubaddel ,&nbsp;Barno Abdullaeva ,&nbsp;Souhail Mohammed Bouzgarrou ,&nbsp;Mohammad Mahtab Alam ,&nbsp;Roma Shahzadi ,&nbsp;Jafar Hasnain","doi":"10.1016/j.triboint.2025.111209","DOIUrl":"10.1016/j.triboint.2025.111209","url":null,"abstract":"<div><div>In contrast to dusty Newtonian fluids, partially ionized non-Newtonian dusty fluids exhibit very different flow properties when exposed to a magnetic field and thermal radiation. The chemical and metallurgical industries, plasma physics, and microfluidic devices can all benefit from a better comprehension of how dusty Casson fluid flows when Hall current and ion slip occur. Few studies have explored the effects of ion slip and Hall current on the flow behavior of dusty Casson fluid in a porous medium confined to a channel. So, in a rectangular channel saturated with porous media, this study investigates the simultaneous influence of Hall and ion slip current on dusty Casson fluid. The heat transmission analysis is also performed with thermal radiative flux for optically thin liquid. The fundamental partial differential equations (PDEs) are resolved analytically using the variable separable technique after applying dimensionless variables. The effect of numerous characteristics on fluid flow, dust particles, as well as on temperature profiles are graphically represented. The fluid velocity rises as the Casson fluid parameter is increased. Dust particles and Casson fluid velocities increase with Hall current along with ion slip parameters. As the radiation parameter increases, so does the temperature of the dusty Casson fluid.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"214 ","pages":"Article 111209"},"PeriodicalIF":6.1,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108795","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}

{"title":"A Fractal Rough surfaces’ Mixed Lubrication model considering Boundary Element Method deformation","authors":"Alessandro Sicilia,&nbsp;Alessandro Ruggiero","doi":"10.1016/j.triboint.2025.111210","DOIUrl":"10.1016/j.triboint.2025.111210","url":null,"abstract":"<div><div>A numerical model able to simulate the Mixed Lubrication regime is developed. It is governed by the Reynolds equation in Elasto-Hydrodynamic mode and the contact equation, where the transition between lubricated and contact areas is managed by a transition function leading to a global set of nonlinear equations. The surfaces’ deformability is evaluated with the Boundary Element Method. The roughness is generated by the Random Mid-Point algorithm which models fractal surfaces. Firstly, the model is applied to a fixed spherical asperity pushed against a moving plane and a sensitivity analysis is conducted. Finally, the model is applied to a fixed rough surface pushed against a moving plane and the results are compared to the Dry Contact case.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"214 ","pages":"Article 111210"},"PeriodicalIF":6.1,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145095868","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}

{"title":"In-situ reaction-driven self-lubricating protection for superior wear resistance in electron beam additively manufactured hierarchical high-entropy nanocomposites","authors":"Jiayu Liu ,&nbsp;Zhibin Wu ,&nbsp;Yongkun Mu ,&nbsp;Jiaxuan Lai ,&nbsp;Xiangyu Qiu ,&nbsp;Caitao Fan ,&nbsp;Zhen Hu ,&nbsp;Chenwei Liu ,&nbsp;Zelan Zhang ,&nbsp;Yuefei Jia ,&nbsp;Haoran Jiang ,&nbsp;Yandong Jia ,&nbsp;Gang Wang","doi":"10.1016/j.triboint.2025.111203","DOIUrl":"10.1016/j.triboint.2025.111203","url":null,"abstract":"<div><div>The challenge of achieving effective lubrication and wear resistance at temperatures exceeding 600 °C is a significant hurdle for metallic materials. This is primarily due to their susceptibility to high-temperature softening and the rapid degradation of conventional lubricants. In this study, we propose a novel strategy to improve high-temperature lubrication and wear resistance by utilizing in-situ reaction-driven self-lubricating protection mechanisms within hierarchical high-entropy nanocomposites (HHENCs), which were fabricated via electron beam additive manufacturing (EBAM) using pre-alloyed (FeCoNi)₈₆Al₇Ti₇ powders. The HHENCs are characterized by a face-centered-cubic (FCC) matrix, and the multiscale hierarchical precipitates of the L1₂, body-centered-cubic (BCC) and L2₁ phases, which exhibit remarkable bifunctional heterogeneity. Firstly, the structural heterogeneity (multiscale precipitates) imparts significant strengthening and toughening effects, improving tribological performance. Additionally, the chemical heterogeneity (diverse affinities of metallic elements for oxygen) favors the formation of a unique multilayer oxide composite structure with self-lubricating properties. Through advanced tribological test and material characterization, we demonstrate that the formation of the multilayer oxide composite structure significantly reduces the coefficient of friction (CoF). At temperatures ranging from 600 to 900 °C, the CoFs reach as low as 0.16–0.29. The continuous plastic deformation of multilayer oxide composite structure during wear contributes to grain refinement, which promotes the formation of stacking faults (SFs) and deformation twins (DTs), enhancing the strength and wear resistance of materials. Our findings underscore the potential of multilayer oxide composite structure to achieve high wear-resistance at temperatures far exceeding those attainable by conventional lubricants, providing a promising pathway for the development of high-temperature self-lubricating alloys.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"214 ","pages":"Article 111203"},"PeriodicalIF":6.1,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145095452","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}