Tribology International最新文献

Improved tribological performance of transition metal selenide solid lubricating films under simulated martian CO2-rich atmosphere 模拟火星富二氧化碳气氛下过渡金属硒化固体润滑膜摩擦学性能的改善

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International

Pub Date : 2026-07-01 Epub Date: 2026-02-11 DOI: 10.1016/j.triboint.2026.111829

Haiyang Gao , Panfeng Yang , Kaixiong Gao , Pinxian Xi , Junyan Zhang , Bin Zhang

Transition metal diselenides, like the commonly used space lubricant material MoS₂, exhibit significant potential in the field of solid lubrication due to their layered structure and low shear strength. In this work, we employed High-Power Impulse Magnetron Sputtering (HiPIMS) to deposit NbSe₂, MoSe₂, and WSe₂ thin films, systematically investigating their film-forming characteristics, mechanical properties, and tribological responses in different environments (ambient atmosphere, high vacuum, and simulated CO₂-rich Martian low-pressure atmosphere). Experimental results indicate that all three films possess a dense microstructure, with a hardness of no less than 2.9 GPa and an elastic modulus exceeding 53 GPa. Tribological tests reveal a significant influence of the atmospheric environment on film performance. In the simulated CO₂-rich Martian environment, the friction coefficients of transition metal diselenide films decreased markedly compared to those under vacuum. Especially, WSe₂ films achieving an ultralow friction coefficient of 0.014 under a 10 N load, with significantly decreased wear rates (0.39 × 10⁻⁷ mm³·N⁻¹·m⁻¹). First-principles calculation, TEM and XPS analyses reveal that CO₂ facilitates the formation of a more ordered and lamellar interfacial lubricating layer and enhances the continuity of transfer films, NbSe₂ forms a niobium-rich transition layer that strengthens transfer film adhesion specifically, which are key mechanisms governing the friction coefficient and wear behavior.

过渡金属二硒化物与常用的空间润滑材料MoS2一样，由于其层状结构和较低的抗剪强度，在固体润滑领域表现出巨大的潜力。在这项工作中，我们采用高功率脉冲磁控溅射（HiPIMS）沉积NbSe2、MoSe2和WSe2薄膜，系统地研究了它们在不同环境（普通大气、高真空和模拟富含二氧化碳的火星低压大气）下的成膜特性、力学性能和摩擦学响应。实验结果表明，三种膜均具有致密的微观结构，硬度不小于2.9 GPa，弹性模量大于53 GPa。摩擦学试验揭示了大气环境对薄膜性能的显著影响。在模拟的富含co2的火星环境中，过渡金属二硒化物薄膜的摩擦系数比真空环境下明显降低。特别是，在10 N载荷下，WSe2薄膜的摩擦系数为0.014，磨损率显著降低（0.39 × 10−7 mm3·N−1·m−1）。第一性原理计算、TEM和XPS分析表明，CO2有利于形成更有序的层状界面润滑层，增强了传递膜的连续性；NbSe2形成富铌过渡层，增强了传递膜的附着力，这是控制摩擦系数和磨损行为的关键机制。

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引用次数: 0

Concentration-induced aggregation of Fe3O4@PAA and polycarboxylate-network-enhanced water-based lubrication 浓度诱导的Fe3O4@PAA聚集和聚羧酸网络增强的水基润滑

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International

Pub Date : 2026-07-01 Epub Date: 2026-02-10 DOI: 10.1016/j.triboint.2026.111823

Yixin Chen , Yubin Ke , Hanwei Wang , Yisimayili Tuersun , Pingjun Luo , Zexi Chen , Sheng Chu

Nanoparticles offer strong potential as water-based lubricant additives, but their tendency to aggregate in aqueous media leads to poor dispersion and unstable tribofilms, limiting tribological enhancement. We developed a hybrid core–shell system composed of poly(acrylic acid)-modified Fe₃O₄ (Fe₃O₄@PAA) and amino-functionalized SiO₂ (SiO₂-NH₂). Small-angle neutron scattering (SANS) and dynamic light scattering (DLS) was used to analyze the colloidal stability and concentration-dependent aggregation of Fe₃O₄@PAA, while tribological testing revealed how surface chemistry governs tribofilm formation and lubrication performance. Results show that Fe₃O₄@PAA maintains a stable core–shell structure with good dispersibility influenced by concentration. During friction, multipoint binding of PAA chains forms a polycarboxylate network, and incorporation of SiO₂-NH₂ reinforces this network and enhances tribofilm stability. At a load of 100 N, the optimum mixture (1 wt% Fe₃O₄@PAA and 1.2 wt% SiO₂-NH₂) reduced the friction coefficient (COF) and wear volume by 74.8 % and 67.8 %, respectively. The proposed “polycarboxylate interfacial network” strategy overcomes the limitations of single-particle systems under high load, highlighting a new pathway for designing efficient, eco-friendly water-based lubricants.

纳米颗粒作为水基润滑剂添加剂具有强大的潜力，但它们在水介质中的聚集倾向导致分散性差和摩擦膜不稳定，限制了摩擦学性能的增强。我们开发了一种由聚丙烯酸修饰Fe3O4 （Fe3O4@PAA）和氨基功能化SiO2 （SiO2- nh2）组成的杂化核壳体系。使用小角中子散射（SANS）和动态光散射（DLS）分析了Fe3O4@PAA的胶体稳定性和浓度依赖性聚集，而摩擦学测试揭示了表面化学如何影响摩擦膜的形成和润滑性能。结果表明：Fe3O4@PAA受浓度的影响，具有稳定的核壳结构和良好的分散性。在摩擦过程中，PAA链的多点结合形成了一个聚羧酸网络，而SiO2-NH2的加入强化了这个网络，提高了摩擦膜的稳定性。在负载为100 N时，最佳配比（1 wt% Fe3O4@PAA和1.2 wt% SiO2-NH2）可使摩擦系数（COF）和磨损体积分别降低74.8% %和67.8% %。提出的“聚羧酸酯界面网络”策略克服了单颗粒系统在高负载下的局限性，为设计高效、环保的水基润滑剂提供了新的途径。

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引用次数: 0

Tunable interfacial friction in two-dimensional ferroelectric In2Se3 heterostructures 二维铁电In2Se3异质结构中的可调界面摩擦

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International

Pub Date : 2026-07-01 Epub Date: 2026-02-10 DOI: 10.1016/j.triboint.2026.111818

Guoliang Ru , Kaiyuan Xue , Xiaoming Zong , Shusheng Xu , Sergey Chizhik , Xuqing Liu , Weihong Qi , Weimin Liu

Interlayer superlubricity and its modulation mechanisms in two-dimensional ferroelectric α-In₂Se₃ have significant implications for nanotribological applications. This study achieves controllable synthesis of high-quality mono- to few-layer In₂Se₃ via electrochemical intercalation exfoliation (EIE), coupled with systematic investigations of interfacial tribological behaviors at hetero/homostructures via atomic force microscopy (AFM) and density functional theory (DFT). The experimental results demonstrate that graphene/In₂Se₃(↓) heterostructures exhibit ultralow friction coefficients (μ = 0.000486), which are two orders of magnitude lower than those of homostructures (μ = 0.0246), which is attributed primarily to incommensurate contact (39.18 % lattice mismatch) and interfacial charge screening effects. DFT calculations confirm that the smooth potential energy landscape (sliding energy barrier: 0.046 meV/Å²) at heterointerfaces significantly suppresses energy dissipation. Furthermore, ferroelectric polarization reversal in In₂Se₃, achieved through electric field modulation, induces interfacial electrostatic repulsion, reducing homostructure friction by > 50 %. Molecular dynamics simulations incorporating machine-learned interatomic potentials reveal edge-pinning effects and strain-engineered friction modulation, establishing theoretical frameworks for designing superlubric interfaces. By integrating multiscale experiments and computational modeling, this work elucidates the atomic origins of interfacial friction in ferroelectric 2D materials, advancing the development of dynamically tunable superlubric devices.

二维铁电α-In2Se3的层间超润滑及其调制机制对纳米摩擦学应用具有重要意义。本研究通过电化学插层剥离（EIE）实现了高质量的单层到多层In2Se3的可控合成，并通过原子力显微镜（AFM）和密度泛函理论（DFT）系统地研究了异质/同质结构下的界面摩擦学行为。实验结果表明，石墨烯/In2Se3（↓）异质结构具有较低的摩擦系数（μ = 0.000486），比同质结构（μ = 0.0246）低2个数量级，这主要是由于不相称接触（39.18 %晶格失配）和界面电荷筛选效应。DFT计算证实，异质界面平滑的势能格局（滑动能垒：0.046 meV/Å2）显著抑制了能量耗散。此外，通过电场调制实现In2Se3中的铁电极化反转，诱导界面静电排斥，使同质结构摩擦减少>； 50 %。结合机器学习原子间势的分子动力学模拟揭示了边缘钉钉效应和应变工程摩擦调制，为超润滑界面的设计建立了理论框架。通过整合多尺度实验和计算模型，本工作阐明了铁电二维材料中界面摩擦的原子起源，推动了动态可调超润滑器件的发展。

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引用次数: 0

Morphological characterization and friction reduction performance of Ni–Co coatings on copper substrates prepared by electrodeposition and ultrafast laser surface texturing 电沉积和超快激光表面织构制备铜基Ni-Co涂层的形貌表征和减摩擦性能

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International

Pub Date : 2026-07-01 Epub Date: 2026-02-10 DOI: 10.1016/j.triboint.2026.111833

Sifan Ge , Weichao Ren , Tongming Sun , Xiaoyu Lu , Zhaoyang Zhang , Kun Xu , Yang Liu , Jingtao Wang , Hao Zhu

Friction reduction at tribological interfaces remains a long-standing topic of both academic and industrial significance. Copper substrates are widely employed in various applications; however, their relatively low hardness necessitates effective strategies for friction and wear protection. In this study, a synergistic approach combining electrodeposited Ni–Co coatings and picosecond laser surface texturing was developed. An orthogonal experiment design was conducted to optimize the laser processing parameters using micro-scale equilateral triangular textures, ensuring sharp edges and minimal thermal damage. The effects of CoSO₄·7H₂O concentration on surface morphology, phase composition, microhardness, and tribological performance were systematically investigated. The results showed that optimal Co incorporation significantly refined the grains and improved both hardness and wear resistance. Furthermore, micro-textures reduced friction and enhanced lubrication, producing a clear synergistic effect. At the optimal CoSO₄·7H₂O concentration of 150 g/L, the Vickers hardness reached 282.5 HV, the crystallite size of the Ni–Co coating decreased to 20.03 nm, and the steady-state coefficient of friction (COF) was reduced to 0.0150, corresponding to a reduction of approximately 77.9 % compared with the untreated substrate. Mechanistic analysis indicates that the Ni–Co coating contributes grain refinement and solid-solution strengthening, whereas the triangular micro-textures trap wear debris and enhance the load-bearing capacity of the lubricant film. The combined effects of hardness enhancement and lubrication improvement effectively mitigate friction and wear. These findings provide a practical strategy for fabricating low-friction and wear-resistant coatings on copper substrates for advanced tribological applications.

摩擦学界面的摩擦减小一直是一个具有学术和工业意义的长期课题。铜基板广泛应用于各种场合；然而，其相对较低的硬度需要有效的摩擦和磨损保护策略。在这项研究中，开发了一种将电沉积镍钴涂层与皮秒激光表面变形相结合的协同方法。采用正交试验设计优化微尺度等边三角形织构的激光加工参数，保证边缘锋利和热损伤最小。研究了coso_4·7h2o浓度对复合材料表面形貌、相组成、显微硬度和摩擦学性能的影响。结果表明，最佳Co掺入量显著细化了晶粒，提高了硬度和耐磨性。此外，微纹理减少摩擦，增强润滑，产生明显的协同效应。当CoSO₄·7H₂O浓度为150 g/L时，镀层的维氏硬度达到282.5 HV，镀层的晶粒尺寸减小到20.03 nm，稳态摩擦系数（COF）减小到0.0150，比未处理的基体降低了约77.9% %。力学分析表明，Ni-Co涂层有助于晶粒细化和固溶强化，而三角形微织构则能捕获磨损碎屑，提高润滑膜的承载能力。硬度增强和润滑改善的综合效果有效地减轻摩擦和磨损。这些发现为在铜基板上制造低摩擦耐磨涂层提供了一种实用的策略，可用于高级摩擦学应用。

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引用次数: 0

A modeling-and-material framework for scuffing failure: Machine learning accelerated prediction and graphene-based mitigation in greased ball bearing 磨损故障的建模和材料框架：机器学习加速预测和基于石墨烯的润滑滚珠轴承缓解

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International

Pub Date : 2026-07-01 Epub Date: 2026-02-10 DOI: 10.1016/j.triboint.2026.111831

Jiaqi Li, Ben An, Zhenshun Li, Gen Chen, Rui Li

Ball bearings are prone to local scuffing failure due to poor lubrication and high temperature, seriously affecting the service life of equipment. Graphene has great potential application in improving lubrication properties as additive. In this paper, the scuffing failure criterion of ball bearing is proposed based on the mixed thermal elastohydrodynamic lubrication (TEHL) model of greased point contacts. But solving this model is time-consuming. Hence, a GA-BP neural network is established using the numerical results. The determination coefficient R² is exceeding 0.9, showing great prediction performance. SHAP analysis reveals that the importance order of features on tribological properties is working conditions, grease properties, roughness. For 6209 deep groove ball bearing lubricated by lithium grease, its safe operating zone is below 10 kN loading. Heavy load and high speed will increase the risk of scuffing failure. In a specific boundary lubrication state, the nanogrease with 0.08 wt% graphene exhibits the best reducing friction and wear capability (23.11 % and 26.18 % decrease). It is attributed to the protective film formation, surface repairing and chemical passivation barrier mechanism. This study achieves efficient prediction of interfacial tribological properties and mitigation of scuffing failure in bearing systems.

滚珠轴承由于润滑不良和温度高，容易出现局部磨损故障，严重影响设备的使用寿命。石墨烯作为添加剂在改善润滑性能方面具有很大的应用潜力。基于润滑点接触的热弹流混合润滑模型，提出了滚珠轴承的磨损失效判据。但是解决这个模型是很耗时的。在此基础上，利用数值结果建立了GA-BP神经网络。决定系数R2大于0.9，具有较好的预测性能。SHAP分析表明，对摩擦学性能影响最大的是工作条件、润滑脂性能、粗糙度。对于锂脂润滑的6209深沟球轴承，其安全工作区低于10 kN载荷。重载和高速会增加磨损失效的风险。在特定的边界润滑状态下，石墨烯含量为0.08 wt%的纳米润滑脂表现出最佳的摩擦磨损减量能力（分别减少23.11 %和26.18 %）。这归因于保护膜的形成、表面修复和化学钝化屏障机制。本研究实现了轴承系统界面摩擦学性能的有效预测和磨损失效的缓解。

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引用次数: 0

Influence of humidity on the tribological properties of PTFE/Al₂O₃ and PTFE/SiO₂ composites: An interpretation based on the tribocatalysis mechanism 湿度对PTFE/Al₂O₃和PTFE/SiO₂复合材料摩擦学性能的影响：基于摩擦催化机理的解释

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International

Pub Date : 2026-07-01 Epub Date: 2026-02-10 DOI: 10.1016/j.triboint.2026.111820

Qingduo Meng , Mingchao Shao , Haishan Su , Kian Kun Yap , Yuxiao Ding , Qihua Wang , Tingmei Wang , Hua Yuan , Fuzhi Song , Chao Wang

To elucidate the role of humidity in the tribochemistry of PTFE nanocomposites, the study systematically compares the tribological behavior of PTFE/Al₂O₃ and PTFE/SiO₂ composites under varying humidity. Results demonstrate that PTFE/Al₂O₃ maintains excellent tribological stability across a broad humidity range, whereas PTFE/SiO₂ exhibits strong humidity dependence, with its wear rate decreasing by an order of magnitude at 70 % relative humidity compared to 10 %. Through FTIR, XPS, FIB-TEM, and density functional theory (DFT) calculations, the difference is traced to a discrepancy in tribocatalytic activity. Al₂O₃ possesses strong Lewis acid sites with high electron affinity, which promote C–F bond scission in PTFE and oxidation of the iron counterface, thereby catalyzing the formation of a robust, chemically adsorbed transfer film irrespective of humidity. In contrast, SiO₂ surfaces exhibit weak Lewis acidity and interact with PTFE primarily through van der Waals forces. The formation of the tribofilm in PTFE/SiO₂ therefore relies heavily on the catalytic effect of the iron counterface, which is modulated by humidity, leading to pronounced humidity sensitivity. This work clarifies the humidity-mediated tribocatalytic mechanisms and provides a theoretical basis for designing environment-adaptive PTFE composites.

为了阐明湿度对PTFE纳米复合材料摩擦学的影响，系统地比较了PTFE/Al₂O₃和PTFE/SiO₂复合材料在不同湿度下的摩擦学行为。结果表明，PTFE/Al₂O₃在很宽的湿度范围内保持优异的摩擦学稳定性，而PTFE/SiO₂表现出强烈的湿度依赖性，其磨损率在70 %相对湿度下比10 %下降了一个数量级。通过FTIR、XPS、FIB-TEM和密度泛函理论（DFT）计算，差异可以追溯到摩擦催化活性的差异。Al₂O₃具有高电子亲和性的强刘易斯酸位点，这促进了聚四氟乙烯中C-F键的断裂和铁表面的氧化，从而催化形成坚固的化学吸附转移膜，而不受湿度的影响。相比之下，SiO₂表面表现出弱刘易斯酸性，主要通过范德华力与PTFE相互作用。因此，PTFE/ sio2中摩擦膜的形成在很大程度上依赖于铁表面的催化作用，这是由湿度调节的，导致明显的湿度敏感性。本研究阐明了湿度介导的摩擦催化机理，为设计环境适应性聚四氟乙烯复合材料提供了理论依据。

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引用次数: 0

Effect of brake pad compositional ratios on friction and stick–slip vibration at the train braking interface 刹车片成分比对列车制动界面摩擦和粘滑振动的影响

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International

Pub Date : 2026-07-01 Epub Date: 2026-02-06 DOI: 10.1016/j.triboint.2026.111810

Manqiang Liu , Zhiwei Wang , Jiliang Mo , Jinjie Hu , Peng Xu , Wangyi Shen , Kaiyun Wang

Lightweight brake friction pairs in urban trains tend to exhibit stick–slip vibrations during braking, yet the influence mechanism of pad formulations on this behavior remains unclear. This study conducted tribological tests on brake pads with three binder ratios and steel fibers contents to reproduce and analyze stick–slip phenomena, and to characterize surface roughness, wear angle, and contact plateaus. Finite element modeling was used to reveal interfacial contact area and stress distribution, while a theoretical model was employed to analyze the impact of surface roughness on stick–slip response. Based on these methods, a “composition–interface state–vibration” correlation framework was established, clarifying the effects of binder and steel fibers on stick–slip vibrations. The results indicate that brake pads with high binder content promote the formation of continuous and stable tribofilms. These tribofilms markedly reduce surface roughness, wear angle, and the heterogeneity of contact plateaus, increase the real contact area, homogenize stress distribution, and lower both interfacial stiffness and the static–dynamic friction coefficient difference (Δµ), thereby suppressing stick–slip vibrations. In contrast, brake pads with high steel fibers content tend to accumulate debris and fracture the tribofilms, resulting in rough surfaces and pronounced heterogeneity of contact plateaus, which increases interfacial stiffness and Δµ, thereby amplifying stick–slip amplitudes. This work provides theoretical insights and engineering guidance for optimizing brake-pad formulations and designing long-service-life brake systems.

城市列车的轻质制动摩擦副在制动过程中往往表现出粘滑振动，但衬垫配方对这种行为的影响机制尚不清楚。本研究对具有三种粘结剂比和钢纤维含量的刹车片进行了摩擦学试验，以再现和分析粘滑现象，并表征表面粗糙度、磨损角和接触高原。采用有限元模型揭示接触面接触面积和应力分布，采用理论模型分析表面粗糙度对粘滑响应的影响。在此基础上，建立了“成分-界面状态-振动”关联框架，阐明了粘结剂和钢纤维对粘滑振动的影响。结果表明，粘结剂含量高的刹车片有利于摩擦膜的连续稳定形成。这些摩擦膜显著降低了表面粗糙度、磨损角和接触平台的非均匀性，增加了实际接触面积，均匀化了应力分布，降低了界面刚度和动静摩擦系数差（Δµ），从而抑制了粘滑振动。相反，钢纤维含量高的刹车片容易积聚碎屑，破坏摩擦膜，导致表面粗糙，接触平台不均匀性明显，增加了界面刚度和Δµ，从而放大了粘滑振幅。这项工作为优化刹车片配方和设计长寿命制动系统提供了理论见解和工程指导。

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引用次数: 0

Finite element modal analysis of a twin-disc tribometer: Sensitivity analysis and experimental validation using vibrometry 双盘摩擦计的有限元模态分析：灵敏度分析和使用振动仪的实验验证

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International

Pub Date : 2026-07-01 Epub Date: 2026-02-03 DOI: 10.1016/j.triboint.2026.111778

G. Brunbauer , M.J. Hochrainer , S. Krenn , A.M. Puhwein , M.S. Bonney , S.J. Eder , P.A. Fotiu

Investigating tribological systems using tribometers is challenging due to the complex interaction between machine vibrations and contact forces. Numerical simulations are therefore essential for interpreting tribological measurements and for improving the design and reproducibility of test rigs. To support the analysis of wear patterns by coupling structural dynamics and contact behaviour, this study develops and validates a high-fidelity finite element model of a twin-disc tribometer as the structural-dynamic foundation of a digital twin. The model includes detailed geometry, bolt pretension, nonlinear contact, nonlinear joints and rigid body components to accurately capture the dynamic behaviour of the system. A sensitivity study quantifies the influence of model parameters on the modal system characteristics. Operational modal analysis of vibrometer measurements confirms the numerical model, and enables the identification of vibration modes that strongly modulate the disc contact forces. These modes are shown to be governed primarily by disc cover stiffness, contact friction and bearing stiffness, explaining experimentally observed shifts in resonance frequencies associated with periodic wear patterns. The validated model therefore provides insights into the interaction between machine dynamics and contact behaviour and forms a basis for the development of a digital twin, taking machine dynamic effects into account.

由于机器振动和接触力之间复杂的相互作用，使用摩擦计研究摩擦学系统具有挑战性。因此，数值模拟对于解释摩擦学测量和改进试验台的设计和再现性至关重要。为了支持通过耦合结构动力学和接触行为来分析磨损模式，本研究开发并验证了双盘摩擦计的高保真有限元模型，作为数字孪生的结构动力学基础。该模型包括详细的几何结构、螺栓预紧、非线性接触、非线性关节和刚体组件，以准确地捕捉系统的动态行为。灵敏度研究量化了模型参数对模态系统特性的影响。振动计测量的运行模态分析证实了数值模型，并能够识别强烈调节圆盘接触力的振动模式。这些模式主要受圆盘盖刚度、接触摩擦和轴承刚度的影响，解释了实验观察到的与周期性磨损模式相关的共振频率的变化。因此，经过验证的模型提供了对机器动力学和接触行为之间相互作用的见解，并为考虑到机器动态效应的数字双胞胎的开发奠定了基础。

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引用次数: 0

Intense pulses and regime transitions of gas–solid triboelectric currents in high-speed flows 高速流动中气固摩擦电流的强脉冲和状态转变

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International

Pub Date : 2026-07-01 Epub Date: 2026-02-05 DOI: 10.1016/j.triboint.2026.111800

Manyu Wang, Bing Wang, Meilin Deng, Pengfei Li

The physical characteristics of gas–solid triboelectric charging under high-speed flows remain poorly understood due to limited direct experimental evidence. In this study, in situ triboelectric current measurements were conducted on a metallic blunt body in a shock-wave wind tunnel. The current signals change from random-like fluctuations at Ma3 to intermittent high-amplitude events at Ma6, and further to amplitude-modulated, non-stationary behavior at Ma8. Statistical analysis and continuous wavelet transform were used to analyze the signal features. The triboelectric current is interpreted as a macroscopic response of stochastic micro-contact events, indicating a transition in the temporal characteristics of the current with increasing inflow velocity, and providing experimental support for mechanistic interpretation of high-speed gas–solid friction.

由于直接实验证据有限，高速流动下气固摩擦电充电的物理特性仍然知之甚少。本文在激波风洞中对金属钝体进行了原位摩擦电流测量。电流信号从Ma3处的随机波动转变为Ma6处的间歇性高振幅事件，并进一步转变为Ma8处的调幅非平稳行为。利用统计分析和连续小波变换对信号特征进行分析。摩擦电流被解释为随机微接触事件的宏观响应，表明电流的时间特征随着流入速度的增加而发生转变，为高速气固摩擦的机理解释提供了实验支持。

引用次数: 0

A novel Cr-free alloy composite coating with superior tribocorrosion resistance 一种新型无铬合金复合涂层，具有优异的耐摩擦腐蚀性能

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International

Pub Date : 2026-07-01 Epub Date: 2026-02-10 DOI: 10.1016/j.triboint.2026.111830

Yupeng Ji , Di Jiang , Dazhou Zhou , Xiaojie Song , Guosong Zhang , Qiang Song , Canming Wang , Xiaojuan Lian , Guijie Wang , Tao Suo , Yan Zhang , Hongzhi Cui

The synergistic damage caused by wear and corrosion presents a critical challenge that severely limits the service performance of key components in high-end equipment, creating an urgent need to develop new wear- and corrosion-resistant composite materials. In this study, a series of CoCrNi-based composite coatings with varying Cr contents were fabricated using laser cladding technology. The results indicate that although the Cr-free coating, which possesses the lowest hardness, demonstrates the poorest corrosion resistance in electrochemical tests, its wear volume under room-temperature dry sliding conditions is two orders of magnitude lower than that of the Cr-containing coatings. Furthermore, under tribocorrosion conditions, its damage volume is reduced by half. This superior performance is attributed to the ability of the Cr-free coating to form a dense tribolayer under both dry and lubricated sliding conditions, effectively isolating the substrate from the counterface. This study provides valuable insights for developing wear- and corrosion-resistant materials capable of in situ formation of protective tribofilms at room temperature.

磨损和腐蚀造成的协同破坏是一个严峻的挑战，严重限制了高端设备中关键部件的使用性能，因此迫切需要开发新的耐磨和耐腐蚀复合材料。本研究采用激光熔覆技术制备了一系列不同Cr含量的cocrni基复合涂层。结果表明，尽管硬度最低的无cr涂层在电化学测试中表现出最差的耐蚀性，但其在室温干滑动条件下的磨损量比含cr涂层小两个数量级。此外，在摩擦腐蚀条件下，其损伤体积减少了一半。这种优异的性能归功于无铬涂层在干燥和润滑滑动条件下形成致密摩擦层的能力，有效地将基材与接触面隔离。该研究为开发能够在室温下原位形成保护性摩擦膜的耐磨损和耐腐蚀材料提供了有价值的见解。

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