Tribology International最新文献

{"title":"A compact tribometer setup for in-situ investigation of tribological contacts using X-ray diffraction","authors":"Josef Prost ,&nbsp;Josef Brenner ,&nbsp;Harald Rojacz ,&nbsp;Ulrike Cihak-Bayr ,&nbsp;Daniel Többens ,&nbsp;Markus Varga ,&nbsp;Klaudia Hradil","doi":"10.1016/j.triboint.2025.111008","DOIUrl":"10.1016/j.triboint.2025.111008","url":null,"abstract":"<div><div>In triboexperiments, structural and chemical changes in a material that lead to wear and, subsequently, component failure, are usually investigated <em>ex post</em>, when wear patterns are already fully formed. Therefore, time-resolved <em>in-situ</em> analysis is crucial for an in-depth investigation of the evolution of these wear patterns to reveal the underlying mechanisms in the tribocontact that entail to material damage and failure.</div><div>This paper introduces a compact tribometer setup especially designed for operation inside a standard-sized diffractometer for both, laboratory and synchrotron applications. This setup enables the <em>in-situ</em> investigation of friction-induced wear mechanisms, such as material transfer, structural changes and surface layer formation using X-ray diffraction (XRD) analysis at specific points in time and space during the experiment without the necessity of sample transfer, which were complementarily compared to electron backscatter diffraction (EBSD) measurements.</div><div>First results obtained at the KMC-2 beamline at BESSY II are presented and compared to laboratory measurements of the same tribosystems. Steel on Ti experiments revealed a change in the preferential orientation of the Ti crystallites induced by a sliding steel pin immediately after a few cycles. In experiments with Al-on-Ti and brass-on-Cu configurations, a transfer of the softer pin material to the harder sample surface and the subsequent formation of a mixed oxide layer were observed.</div><div>The presented setup provides a versatile tool for the <em>in-situ</em> investigation of dynamic near-surface changes in tribosystems with a wide range of applications, including material transfer, surface layer formation, structural changes as well as the evolution of residual stresses.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"213 ","pages":"Article 111008"},"PeriodicalIF":6.1,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144738760","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 functionalized h-BN and ionic liquid on tribological performance and thermal stability of PAO-based nanolubricants","authors":"Vikash Kumar Gupta ,&nbsp;Bhimraj Singh ,&nbsp;Homender Kumar ,&nbsp;Shivam Awasthi ,&nbsp;Manvandra Kumar Singh ,&nbsp;Jitendra Kumar Katiyar ,&nbsp;Anita Mohan","doi":"10.1016/j.triboint.2025.111041","DOIUrl":"10.1016/j.triboint.2025.111041","url":null,"abstract":"<div><div>This study investigates the tribological properties and thermal stability of a novel hybrid nanolubricant composed of pristine hexagonal boron nitride (BN), functionalized hexagonal boron nitride (fBN) nanosheets, and anionic liquid (IL) as additives, with polyalphaolefin (PAO) as the base oil. The microstructural and chemical characteristics of pristine BN and fBN were characterized by XRD, HR-SEM, HR-TEM, FTIR, and Raman spectroscopy.Nanolubricants were prepared by blending of BN and fBN at 0.05 wt% and 0.1 wt% concentrations, and IL at a fixed 1 wt%, into PAO base oil. Tribological testing was conducted using a “ball-on-disc” setup, while thermal stability was assessed via thermo-gravimetric analysis (TGA). Thermal stability improved significantly, with the onset degradation temperature increasing by approximately 33 % and the complete decomposition temperature rising by 21 % compared to neat PAO. The formulation containing 0.1 wt% fBN and 1 wt% IL in PAO exhibited the maximum reduction in COF (approximately 61 %) and wear volume (approximately 33 %). The performance improvements are attributed to tribo-film formation at contact interfaces, confirmed by HR-SEM, EDX, 3D optical profilometry, and Raman spectroscopy. The novelty of this work lies in the synergistic integration of functionalized BN nanosheets with an imidazolium-based IL in a nonpolar PAO base oil, which has not been explored previously. This hybrid formulation substantially enhanced friction reduction and wear resistance under boundary lubrication, providing a promising pathway for developing advanced nanolubricants to improve energy efficiency and extend component durability.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"213 ","pages":"Article 111041"},"PeriodicalIF":6.1,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144723231","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":"Impact of oxygen-doping on heterostructure evolution and mechanical properties of FeCrNi alloy fabricated via laser directed energy deposition","authors":"Wei Cheng ,&nbsp;Xiu-Bo Liu ,&nbsp;Xin-Gong Li ,&nbsp;Hai-Bin Zhou ,&nbsp;Yuan Meng ,&nbsp;Hong Deng ,&nbsp;Zhi-Yong Wang ,&nbsp;Shi-Hong Zhang","doi":"10.1016/j.triboint.2025.111043","DOIUrl":"10.1016/j.triboint.2025.111043","url":null,"abstract":"<div><div>Oxygen has garnered significant attention for its ability to regulate phase transformations in alloys, thereby markedly enhancing their mechanical properties. This study focuses on the structural evolution and mechanical property modulation of FeCrNi alloys. Through oxide doping, single-layer FeCrNi (MEA), Ti₃Fe₃₃Cr₃₂Ni₃₂ (MEA-T) and Ti₃Fe₃₁Cr₃₀Ni₃₀O₆ (MEA-O) alloys were successfully fabricated by laser directed energy deposition. A combination of experimental methods and molecular dynamics simulations was employed to evaluate alloy performance and analyze deformation mechanisms. The results demonstrate partial melting of TiO₂ in MEA-O, with in-situ synthesized oxide heterostructures significantly increasing geometrically necessary dislocation density, confirming their critical role in promoting dislocation nucleation and strengthening the coating. Furthermore, semi-coherent structures formed between distinct oxides coordinate cross-interface dislocation slip, reducing stress concentration and brittle fracture risk, thereby enhancing load transfer efficiency. Compared to oxygen-free alloys, MEA-O synergistically improves elastic modulus due to nanoscale precipitates and high-density semi-coherent interfaces at phase boundaries that restrict dislocation motion. Additionally, MEA-O coatings exhibit significantly enhanced wear resistance and friction reduction performance under both ambient and elevated temperatures. Conversely, Ti-doped MEA-T alloy shows performance degradation during high-temperature friction tests. Molecular dynamics simulations reveal titanium doping increases the γ_usf value of MEA-T, facilitating dislocation slip during deformation. However, precipitation strengthening causes non-uniform distribution of strengthening phases and grain refinement. These strengthening phases and grain boundaries collectively hinder dislocation propagation, increasing stacking fault roughness and stress concentration, consequently degrading the high-temperature wear resistance of the coating.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"213 ","pages":"Article 111043"},"PeriodicalIF":6.1,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144723066","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":"Microscopic insights into wetting-like spatiotemporal evolution of spontaneous ice and its tribological behavior","authors":"Yuhao Wu ,&nbsp;Sheng Li ,&nbsp;Liguo Qin ,&nbsp;Guangneng Dong ,&nbsp;Qiao Hu","doi":"10.1016/j.triboint.2025.111040","DOIUrl":"10.1016/j.triboint.2025.111040","url":null,"abstract":"<div><div>The lubrication process of ice has been an elusive problem for centuries. Here, we report a wetting-like state before the pressure melting in ice friction processes through molecular dynamics simulations of spontaneous ice. Ice wetting, exhibiting spatiotemporal evolution, is influenced by the wettability of the solid plate, ice temperature, and compression method. Hot ice (270 K) will expand, wet, and reconstruct to form a quasi-liquid layer when the solid plate is close to ice. Cold (200 K) ice only expands and exhibits elasticity that satisfies Hooke's law when adsorbed and compressed on the plate. Ice wetting and low friction coefficient (&lt; 0.01) occur under the same conditions, which indicates that ice wetting is a precursor condition for ice slip.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"213 ","pages":"Article 111040"},"PeriodicalIF":6.1,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144738759","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":"Graphene vacancy defect density effects on the tribological performance of PTFE-based composites at extreme low temperatures: Insights from reactive molecular dynamics simulations","authors":"Yiyao Luo,&nbsp;Ke Yan,&nbsp;Fei Chen,&nbsp;Bin Fang,&nbsp;Jiannan Sun,&nbsp;Jindao Guo,&nbsp;Zhenguo Bian,&nbsp;Chaoqun Tian,&nbsp;Ruizhi Li,&nbsp;Jun Hong","doi":"10.1016/j.triboint.2025.111037","DOIUrl":"10.1016/j.triboint.2025.111037","url":null,"abstract":"<div><div>This study investigates the effect of graphene (Gr) fillers with different defect densities (<em>D</em>_Gr = 0 %, 2 %, 4 %, 8 %) on the tribological properties of polytetrafluoroethylene (PTFE)-based composites under extremely low-temperature conditions (80 K) using reactive force field molecular dynamics simulations. The results show that low defect density Gr fillers (<em>D</em>_Gr = 0 %, 2 %, 4 %) significantly improve the lubrication performance of PTFE by reducing friction force and coefficient by approximately 50 %, and effectively suppress heat accumulation, lowering the temperature by about 21 %. However, when <em>D</em>_Gr reaches 8 %, the thermal conductivity of the Gr fillers decreases, leading to a temperature rise of 2.29 %, and the friction performance returns to the level of pure PTFE. Additionally, the low defect density Gr fillers further optimize the tribological performance by promoting PTFE molecular movement and reducing interface mechanical mixing.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"213 ","pages":"Article 111037"},"PeriodicalIF":6.1,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144723069","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":"Fretting fatigue failure of TC4-CFRP riveted structures under cyclic shear load","authors":"Jianhua Liu ,&nbsp;Zhongfeng Weng ,&nbsp;Yue Zhao ,&nbsp;Hechang Li ,&nbsp;Jianfei Sun ,&nbsp;He Wang ,&nbsp;Yanwei Xu ,&nbsp;Jinfang Peng ,&nbsp;Minhao Zhu","doi":"10.1016/j.triboint.2025.111036","DOIUrl":"10.1016/j.triboint.2025.111036","url":null,"abstract":"<div><div>This study utilizes both experimental and numerical methods to investigate the fretting fatigue failure of TC4-carbon fiber reinforced plastic (CFRP) riveted single-shear lap joints under varying CFRP thicknesses and cyclic loads. It focuses on analyzing the dynamic response, the evolution of the contact state, and the failure mechanisms of these joints. Findings indicate that the fatigue testing process consists of two distinct stages. In the partial slip state under low loads, the interfacial temperature remains at approximately 30 °C, and fretting fatigue failure initiates on the CFRP surface. During the gross slip state under high loads, the interfacial temperature rises to around 58 °C, and the combined effects of carbon fiber structural damage and matrix bond breakage result in macroscopic wear of the CFRP. Increasing the thickness of CFRP significantly prolongs its fatigue life. For the same load half-amplitude, the fatigue life is extended by approximately 2000 times. Therefore, enhancing fatigue performance at low loads is achievable by modifying the thickness, but high loads necessitate the use of high-temperature-resistant composite materials.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"213 ","pages":"Article 111036"},"PeriodicalIF":6.1,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144723229","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":"Ultra-low friction with SiO2 nanoparticles bonded sorbitan monostearate oleogel as green lubricant additives","authors":"Baihong Yu,&nbsp;Yan Shen,&nbsp;Leize Li,&nbsp;Junjing Fan,&nbsp;Jinghao Qu,&nbsp;Jiujun Xu","doi":"10.1016/j.triboint.2025.111032","DOIUrl":"10.1016/j.triboint.2025.111032","url":null,"abstract":"<div><div>SiO₂ nanoparticles bonded sorbitan monostearate oleogel (SiO₂-SMS gel) was prepared by water bath heating. The green oleogel additive in the mineral base oil reduced both the friction coefficient and the wear depth by over 50 % for the DLC and cast iron tribopairs. It achieved an ultra-low friction coefficient of 0.0411. The excellent tribological properties are attributed to the formation of a 300 nm bilayer tribofilm on the cast iron surface. The tribofilm effectively prevents plastic deformation and abrasive wear of the tribopairs. Hydroxyl bonding in the SMS molecules and the embedding of SiO₂ NPs ensure strong adhesion of the tribofilm to the substrate. The findings offer valuable insights for the development of high-performance lubricant additives.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"213 ","pages":"Article 111032"},"PeriodicalIF":6.1,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144723067","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":"Tribological properties of TiN-Si2N2O modified C/C-SiC composites by warm pressing-in-situ densification","authors":"Zimu Hu,&nbsp;Running Wang,&nbsp;Zhaoxi Gou,&nbsp;Tengyang Zhang,&nbsp;Chiyu Liu,&nbsp;Ying Xia,&nbsp;Jie Fei,&nbsp;Lehua Qi","doi":"10.1016/j.triboint.2025.111028","DOIUrl":"10.1016/j.triboint.2025.111028","url":null,"abstract":"<div><div>Carbon/carbon-silicon carbide composites (C/C-SiC) have gained widespread attention as a new type of braking materials, but the long preparation cycle and cost have limited the wide range of applications. In this work, a novel warm pressing-in-situ densification method was proposed to prepare TiN-Si₂N₂O modified C/C-SiC composites. This novel method reduced the preparation cycle time significantly. The results showed that CTNS-3 with 44.5 % TiN-Si₂N₂O content had the best flexural and compressive performance, with 145 % and 87 % improvement. CTNS-2 with 37.0 % TiN-Si₂N₂O content had the best tribology performance. Additionally, the wear rate of CTNS-2 achieved 0.433 μm/cycle, representing an impressive decrease of 48 %. This work balance rapid preparation with excellent performance, providing a promising strategy for the development of C/C-SiC braking materials.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"213 ","pages":"Article 111028"},"PeriodicalIF":6.1,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144714312","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":"Adhesion and friction in viscoelastic rough contacts","authors":"Michele Mastropasqua ,&nbsp;Andrea Ronchi ,&nbsp;Antonio Serra ,&nbsp;Nicola Menga ,&nbsp;Giuseppe Carbone","doi":"10.1016/j.triboint.2025.111000","DOIUrl":"10.1016/j.triboint.2025.111000","url":null,"abstract":"<div><div>Controlling adhesion and friction in viscoelastic contacts is crucial in several application fields of modern engineering. In this study, we investigate the adhesive contact of rough profiles sliding past a viscoelastic half-plane. We solve the multiscale contact problem enforcing energy balance between internal stresses and adhesive works under virtual infinitesimal variations of the contact domain. Our findings indicate that the interplay between adhesion and viscoelasticity at the contact edges and in the bulk material is fostered by multiscale roughness, eventually leading to strongly increased contact area and friction at characteristic sliding velocities. Finally, we compare the frictional behavior of a sinusoidal indenter (single wavelength) with the rough case (multiscale), showing that adhesion-induced friction enhancement occurs in both cases.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"213 ","pages":"Article 111000"},"PeriodicalIF":6.1,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144723065","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":"Formation of interlayer during cyclic wear process between pure titanium with hydroxiapatite by mechano-chemical interactive migration","authors":"Dinh Dat Pham ,&nbsp;Yuichi Otsuka ,&nbsp;Yukio Miyashita","doi":"10.1016/j.triboint.2025.110919","DOIUrl":"10.1016/j.triboint.2025.110919","url":null,"abstract":"<div><div>The estimation of nanoscale wear is crucial for comprehending the failure mechanisms of mechanical components, particularly in biomedical applications where wear-induced damage at the implant interface can result in aseptic loosening and failure. Although recent wear models effectively estimate wear coefficients, they exhibit limitations in accounting for the inelastic deformation and diffusion at the interlayer. A comprehensive understanding of interlayer formation and its impact is essential for elucidating the interplay between the mechanical and chemical effects in fretting wear behavior, which is vital for enhancing the longevity of mechanical components and implants. This study aims to examine the cyclic wear behavior of Ti in contact with a HAp surface under normal load by integrating mechanical and chemical influences. Three loading cycles, including the approach-retraction process of Ti spheres on the HAp surface, were simulated using Molecular Dynamics (MD) simulations with a reactive force field and the charge equilibrium method. The predominance of charge migration and the interactive effects of mechanical diffusion and charge migration on the local wear behavior were examined by analyzing the influence of temperature and charge variation on the Ti wear rate. Heterogeneous cyclic wear behavior was observed, with severe wear activation during contact formation followed by reduced wear owing to the charged Ti interlayer. This finding underscores the role of the interlayer in enhancing the wear resistance, emphasizing the necessity of incorporating surface chemistry and mechanical deformation in predictive wear modeling.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"213 ","pages":"Article 110919"},"PeriodicalIF":6.1,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144723068","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}