Lubrication Science最新文献

Study on Mixed Lubrication Performance of a New Type of Multi-Liner Water-Lubricated Stern Bearing Under Complex Working Conditions 复杂工况下新型多衬套水润滑尾轴轴承混合润滑性能研究

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2025-08-22 DOI: 10.1002/ls.70007

Nan Wang, Huabing Jing, Yihua Chen, Donghui Li, Tongjiang Duan, Mingwu Wang, Changming Zhang

{"title":"Study on Mixed Lubrication Performance of a New Type of Multi-Liner Water-Lubricated Stern Bearing Under Complex Working Conditions","authors":"Nan Wang, Huabing Jing, Yihua Chen, Donghui Li, Tongjiang Duan, Mingwu Wang, Changming Zhang","doi":"10.1002/ls.70007","DOIUrl":"https://doi.org/10.1002/ls.70007","url":null,"abstract":"<div>\u0000 \u0000 <p>Due to the incomplete understanding of the mixed lubrication mechanisms of novel multi-layered composite water-lubricated stern bearings under complex operational conditions, this paper addresses the cantilevered offset loading conditions and the multifactorial coupling characteristics that these bearings frequently encounter in such complex scenarios. Firstly, a mathematical and physical model for mixed lubrication within the multi-layered composite water-lubricated bearing-flexible rotor system was established. Secondly, numerical simulations were utilised to analyse the impact of coupled factors such as rotational speed, load, water supply pressure and radial clearance on the mixed lubrication performance of the bearings. Finally, a water-lubricated bearing test rig was constructed to conduct multi-condition and multi-section lubrication performance tests on the bearings. The research findings indicate that under single-sided loading conditions with the same velocity increment, the water film pressure decay rate accelerates from measurement points P1 to P5, with a pronounced decay observed at section P5, with a decrease of 48%. As the rotational speed increases, the squeezing effect diminishes for sections further from the cantilever end, leading to a reduction in water film pressure and alleviation of pressure concentration. Under double-sided loading conditions, the water film pressure in the cross-section at measurement point P2 decreases by 10%, and this trend moderates as the load increases. In contrast, the water film pressure in the cross-section at measurement point P5 increases to 25 kPa, and the circumferential distribution of the water film broadens. Moreover, as the rotational speed increases, the water film pressure decreases and the circumferential distribution of the water film narrows.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 7","pages":"442-465"},"PeriodicalIF":1.9,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145272917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Contact Fatigue of Carbon Steel Gear Under Different Lubrication Conditions 不同润滑条件下碳钢齿轮的接触疲劳

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2025-08-22 DOI: 10.1002/ls.70006

Shengnan Zhang, Ming Yan, Changqi Yang, Qidi Wang, Haochuan Li

引用次数: 0

Investigating the Frictional Characteristics of Tire-Asphalt Pavement Interactions Under Complex Conditions 复杂条件下轮胎-沥青路面相互作用的摩擦特性研究

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2025-08-21 DOI: 10.1002/ls.70008

Shiren La, Xiaobin Li, Anhua Xu, Jianhong Fang

{"title":"Investigating the Frictional Characteristics of Tire-Asphalt Pavement Interactions Under Complex Conditions","authors":"Shiren La, Xiaobin Li, Anhua Xu, Jianhong Fang","doi":"10.1002/ls.70008","DOIUrl":"https://doi.org/10.1002/ls.70008","url":null,"abstract":"<div>\u0000 \u0000 <p>In this study, a dynamic friction testing apparatus was independently developed to investigate the frictional properties of tire-asphalt pavements under varying road conditions, tailored to complex working environments. This device underwent rigorous reliability analysis to ensure compliance with the experimental standards. The calibration of asphalt pavements with varying heating durations established regions of uniform temperature. Experiments were conducted using custom-designed equipment under conditions involving changes in particle size, temperature, and surface roughness. Results showed that both the maximum static friction and average friction forces increased with increasing temperature. Smaller particle sizes intensified stick–slip behaviour but reduced frictional forces, whereas greater tire surface roughness enhanced friction and accentuated stick–slip phenomena. An improved spring-slider model was proposed to simulate the frictional behaviour of asphalt pavements, yielding results consistent with the experimental data. Adjusting the roughness parameter in the model demonstrated that friction gradually decreases with reduced roughness, while stick–slip effects diminish, aligning qualitatively with the experimental observations.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 7","pages":"422-430"},"PeriodicalIF":1.9,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145272774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Role of PTFE Lubricant Additives in Enhancing Rolling Contact Fatigue Life PTFE润滑油添加剂对提高滚动接触疲劳寿命的作用

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2025-08-05 DOI: 10.1002/ls.70003

M. R. Ranju, D. Kesavan

引用次数: 0

A Lithium Stearate and Fumed Silica Co-Thickened Grease With Poly(Sodium-4-Styrenesulfonate) Additive for Electric Vehicles 电动汽车用硬脂酸锂和气相二氧化硅共增稠润滑脂与聚（4-苯乙烯磺酸钠）添加剂

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2025-07-27 DOI: 10.1002/ls.70005

Saswat Gautam, Sruthi Huligujje, Linto Davis, Ramkumar Penchaliah, Abhijit P. Deshpande

{"title":"A Lithium Stearate and Fumed Silica Co-Thickened Grease With Poly(Sodium-4-Styrenesulfonate) Additive for Electric Vehicles","authors":"Saswat Gautam, Sruthi Huligujje, Linto Davis, Ramkumar Penchaliah, Abhijit P. Deshpande","doi":"10.1002/ls.70005","DOIUrl":"https://doi.org/10.1002/ls.70005","url":null,"abstract":"<div>\u0000 \u0000 <p>In this study, lithium stearate and fumed silica co-thickened grease with po-ly(sodium-4-styrenesulfonate) (PSSNa) additive was synthesised and characterised for application as an automotive lubricant, including for the potential use in an electric vehicle (EV). Oscillatory shear and steady shear rheological tests confirmed that the sample exhibited appropriate shear thinning required in greases. Fumed silica was found to increase thermal stability. Additionally, the conductivity of the synthesised grease was higher than the threshold conductivity required to avoid electrical arcing and static charge buildup (4 × 10<sup>−12</sup> S/cm). The tribo-pair lubricated with LSFSPNa grease demonstrated a significant improvement in tribological performance, with the coefficient of friction reduced by approximately 65% compared to commercial grease, decreasing from 0.31 to 0.11. The wear volume showed a tenfold reduction, accompanied by a substantial decrease in surface roughness (Ra), which dropped from 0.81 μm with commercial grease to 0.17 μm with LSFSPNa grease. At the same time, the synthesised grease exhibited better copper corrosion resistance. Overall, the synthesised grease was found to be compatible for EV applications in terms of rheology, friction reduction, copper corrosion resistance, conductivity, and thermal stability.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 7","pages":"399-409"},"PeriodicalIF":1.9,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145272697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative Study of Tribological Characteristics of Magnetron Sputtered CrN and Carbon Doped CrCN Coatingson Automotive Piston Rings Under Boundary Lubrication 边界润滑下磁控溅射CrN与掺杂CrCN涂层汽车活塞环摩擦学特性的比较研究

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2025-07-26 DOI: 10.1002/ls.70002

Sumit Kumar, M. S. Charoo

{"title":"Comparative Study of Tribological Characteristics of Magnetron Sputtered CrN and Carbon Doped CrCN Coatingson Automotive Piston Rings Under Boundary Lubrication","authors":"Sumit Kumar, M. S. Charoo","doi":"10.1002/ls.70002","DOIUrl":"https://doi.org/10.1002/ls.70002","url":null,"abstract":"<div>\u0000 \u0000 <p>Friction and wear are major challenges in automotive engines, and they can lead to significant operating issues such as increased fuel consumption, component damage, heat generation, loss of performance, etc. Friction and wear between piston rings and cylinder liner are significant issues in automotive engines, and researchers continually focus on reducing them to improve engine performance and efficiency. Numerous studies have been carried out to minimise friction and wear losses. However, coating is one of the promising techniques used in the automotive industry. PVD-deposited, CrN-coated piston rings demonstrated excellent tribological properties. However, CrN coatings become less effective under conditions of lubrication starvation, exhibiting a high coefficient of friction. In the present study, PVD-based magnetron sputtered CrN and carbon-doped CrCN coatings were applied to the surface of the piston rings. The structure, elemental composition, surface morphology, thickness, and hardness of the coatings were characterised systematically. The coated samples underwent tribological testing under loads of 50, 80, and 110 N to assess the coefficient of friction at the piston ring-cylinder liner interface under the boundary lubrication condition and evaluate the wear behaviour of the coated ring samples. The carbon-doped CrCN coating exhibits a low coefficient of friction at each load and exhibits a 16.59% reduction in the coefficient of friction compared to the CrN coating. This could be ascribed to the graphitisation effect of the CrCN coating. However, both coatings showed almost equal and minimal wear loss. Finally, the possible worn morphology of coated samples was proposed based on their microstructure, film deposition, and Raman's spectroscopy results.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 6","pages":"383-397"},"PeriodicalIF":1.9,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145013188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Potential Application of Oil-Soluble LaF3 Nanoparticles as High-Performance Gear Oil Additives 油溶性纳米LaF3作为高性能齿轮油添加剂的潜在应用

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2025-07-23 DOI: 10.1002/ls.70004

Tao Wu, Shuguang Fan, Ningning Song, Chuanping Gao, Shengmao Zhang, Yujuan Zhang

{"title":"Potential Application of Oil-Soluble LaF3 Nanoparticles as High-Performance Gear Oil Additives","authors":"Tao Wu, Shuguang Fan, Ningning Song, Chuanping Gao, Shengmao Zhang, Yujuan Zhang","doi":"10.1002/ls.70004","DOIUrl":"https://doi.org/10.1002/ls.70004","url":null,"abstract":"<div>\u0000 \u0000 <p>This study aims to explore the potential application of LaF<sub>3</sub> nanoparticles as high-performance gear oil additives. Lanthanum trifluoride nanoparticles modified by di(2-ethylhexyl) phosphoric acid (D2EHPA) [denoted as LaF<sub>3</sub>-D2EHPA], which exhibited excellent dispersion stability, were prepared using a liquid-phase chemical method. The tribological properties of LaF<sub>3</sub>-D2EHPA nanoparticles in weakly polar mineral base oil (150 N), polyalphaolefin (PAO6), and strongly polar synthetic ester oil diisooctyl sebacate (DIOS) were investigated using a four-ball friction and wear tester. In combination with the adsorption experiments using a dissipative quartz crystal microbalance (QCM-D), the compatibility and action mechanisms of LaF<sub>3</sub>-D2EHPA nanoparticles with extreme-pressure and anti-wear additives for typical gear oils were further investigated. The results indicate that when the mass fraction of LaF<sub>3</sub>-D2EHPA nanoparticles is 0.2%, the tribological properties of all three base oils are improved to the greatest extent. When LaF<sub>3</sub>-D2EHPA nanoparticles are mixed with gear oil additives T321 (sulfurized isobutylene) and T307 (ammonium thiophosphate), they exhibit high film-forming rates and anti-wear properties, forming a boundary lubricating film on the worn surface. This film consists of a tribochemical reaction film containing sulfur and phosphorus, as well as LaF<sub>3</sub>-D2EHPA nanoparticles that have been deposited.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 6","pages":"369-382"},"PeriodicalIF":1.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145013229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Friction Modifiers on Physico-Chemical and Tribological Properties of Industrial Oils 摩擦改性剂对工业用油理化及摩擦学性能的影响

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2025-07-14 DOI: 10.1002/ls.70001

M. N. K. Prasad Bolisetty, Inder S. Sudhir, Chanakya Tripathi, Sanker Bhadavath, Kavita Rai, Ajay K. Harinarain, Mukul Maheshwari

引用次数: 0

Impact of Lubricant Additives-Soot Interactions on the Tribological Properties of Lithium Grease 润滑油添加剂-油烟相互作用对锂基润滑脂摩擦学性能的影响

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2025-07-14 DOI: 10.1002/ls.70000

Xing'an Cao, Haixiang Huan, Linzhen Zhou

{"title":"Impact of Lubricant Additives-Soot Interactions on the Tribological Properties of Lithium Grease","authors":"Xing'an Cao, Haixiang Huan, Linzhen Zhou","doi":"10.1002/ls.70000","DOIUrl":"https://doi.org/10.1002/ls.70000","url":null,"abstract":"<div>\u0000 \u0000 <p>Among atmospheric contaminants, soot is known to cause severe wear of mechanical components and degrade lubricating oils; however, its impact on lubricity grease remains largely unexplored. This study investigates the interactions between carbon black (as a soot surrogate) and other lubricant additives, including molybdenum disulfide (MoS<sub>2</sub>) and anti-wear additive zinc dialkyldithiophosphate (ZDDP). Additionally, the effects of individual and combined additions of MoS<sub>2</sub> and ZDDP on the tribological properties of soot-contaminated lithium grease (LG) were compared. The lubricity of LG decreased progressively with increasing soot concentration. Conversely, incorporating MoS<sub>2</sub> improved the lubricity of LG, with optimal performance observed at 0.5 wt%. The individual addition of MoS<sub>2</sub> to LG minimally mitigated the abrasive wear caused by soot; however, the inclusion of ZDDP T202 enhances the effectiveness of MoS<sub>2</sub> in reducing the friction and wear. MoS<sub>2</sub> and ZDDP participate in tribochemical reactions to form protective films during sliding. MoS<sub>2</sub> contributes by reducing friction, while ZDDP reacts to form protective films that enhance wear resistance. However, the combined addition of ZDDP and MoS<sub>2</sub> demonstrates limited effectiveness in fully mitigating the adverse effects of soot on grease lubrication. Consequently, exploring more efficient methods to prevent lubrication failure caused by soot.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 6","pages":"357-368"},"PeriodicalIF":1.9,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145012699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the High-Temperature Bearing Test and Thermal-Oxidative Process of Aviation Lubricating Oils 航空润滑油高温承载试验及热氧化过程研究

IF 1.8 4区工程技术

Lubrication Science Pub Date : 2025-04-04 DOI: 10.1002/ls.1746

Lichun Hao, He Yang, Ang Li, Haiqing Song, Jingjian He, Yuxiang Liang

{"title":"Study on the High-Temperature Bearing Test and Thermal-Oxidative Process of Aviation Lubricating Oils","authors":"Lichun Hao, He Yang, Ang Li, Haiqing Song, Jingjian He, Yuxiang Liang","doi":"10.1002/ls.1746","DOIUrl":"https://doi.org/10.1002/ls.1746","url":null,"abstract":"<div>\u0000 \u0000 <p>With the development of aviation engine technology, the temperature in the lubricating system continues to rise. It is expected that aviation lubricating oils should have excellent thermal-oxidative stability. The high-temperature deposit and oil degradation characteristic test is adopted to evaluate the thermal stability of aviation lubricating oils in the performance specifications. In this study, a high-temperature bearing test machine was established first, and two typical aviation lubricating oils were measured by this developed test machine. The thermal-oxidative processes and ageing mechanisms of the aviation lubricating oils in the high-temperature bearing test were analysed. Moreover, the extreme-pressure and anti-wear performances of the aviation lubricating oils before and after the bearing test were studied. Experimental results indicated that the established high-temperature bearing test machine had good discriminability, and the high-temperature bearing test could meet the standard method requirements. Viscosity and total acid number (TAN) of the two aviation lubricating oils gradually increased with the high-temperature bearing test time. Antioxidants and anti-wear and extreme-pressure additives were consumed during the bearing test. Compared with dioctyldiphenylamine (DODPA), the antioxidant additive <i>n</i>-phenyl-<i>α</i>-naphthylamine (<i>α</i>-NPA) exhibited higher antioxidant activity under test conditions. The thermal-oxidative degradation of the aviation lubricating oils involved complex physical and chemical processes. The effects of the thermal oxidation on the extreme-pressure and anti-wear performances of the two aviation lubricating oils were significantly different.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"37 4","pages":"264-275"},"PeriodicalIF":1.8,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0