Lubricants最新文献_第6页

Preparation and Tribological Performance of Multi-Layer van der Waals Heterostructure WS2/h-BN 多层范德华异质结构 WS2/h-BN 的制备与摩擦学性能

Lubricants Pub Date : 2024-05-07 DOI: 10.3390/lubricants12050163

Yunqi Fang, Yang Sun, Fengqin Shang, Jing Zhang, Jiayu Yao, Zihan Yan, Hangyan Shen

{"title":"Preparation and Tribological Performance of Multi-Layer van der Waals Heterostructure WS2/h-BN","authors":"Yunqi Fang, Yang Sun, Fengqin Shang, Jing Zhang, Jiayu Yao, Zihan Yan, Hangyan Shen","doi":"10.3390/lubricants12050163","DOIUrl":"https://doi.org/10.3390/lubricants12050163","url":null,"abstract":"Van der Waals heterostructures with incommensurate contact interfaces show excellent tribological performance, which provides solutions for the development of new solid lubricants. In this paper, a facile electrostatic layer-by-layer self-assembly (LBL) technique was proposed to prepare multi-layer van der Waals heterostructures tungsten disulfide/hexagonal boron nitride (vdWH WS2/h-BN). The h-BN and WS2 were modified with poly (diallyldimethylammonium chloride) (PDDA) and sodium dodecyl benzene sulfonate (SDBS) to obtain the positively charged PDDA@h-BN and the negatively charged SDBS@WS2, respectively. When the mass ratio of PDDA to h-BN and SDBS to WS2 were both 1:1 and the pH was 3, the zeta potential of PDDA@h-BN and SDBS@WS2 were 60.0 mV and −50.1 mV, respectively. Under the electrostatic interaction, the PDDA@h-BN and SDBS@WS2 attracted each other and stacked alternately along the (002) crystal plane forming the multi-layer (four-layer) vdWH WS2/h-BN. The addition of the multi-layer vdWH WS2/h-BN (1.0 wt%) to the base oil resulted in a significant reduction of 33.8% in the friction coefficient (0.104) and 16.8% in the wear rate (4.43 × 10−5 mm3/(N·m)). The excellent tribological property of the multi-layer vdWH WS2/h-BN arose from the lattice mismatch (26.0%), a 15-fold higher interlayer slip possibility, and the formation of transfer film at the contact interface. This study provided an easily accessible method for the multi-layer vdWH with excellent tribological properties.","PeriodicalId":502914,"journal":{"name":"Lubricants","volume":"29 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141005442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Elastic and Elastoplastic Contact Mechanics of Concentrated Coated Contacts 集中涂层触头的弹性和弹塑性接触力学

Lubricants Pub Date : 2024-05-07 DOI: 10.3390/lubricants12050162

P. Johns-Rahnejat, N. Dolatabadi, Homer Rahnejat

{"title":"Elastic and Elastoplastic Contact Mechanics of Concentrated Coated Contacts","authors":"P. Johns-Rahnejat, N. Dolatabadi, Homer Rahnejat","doi":"10.3390/lubricants12050162","DOIUrl":"https://doi.org/10.3390/lubricants12050162","url":null,"abstract":"Machines operate under increasingly harsher contact conditions, causing significant wear and contact fatigue. Sub-surface stresses are responsible for the premature contact fatigue of rolling element bearings, meshing gears, and cam–follower pairs. Surface protection measures include hard, wear-resistant coatings. Traditionally, contact integrity has been predicted using classical Hertzian contact mechanics. However, the theory is only applicable when the contact between a pair of ellipsoidal solids of revolution may be considered as a rigid indenter penetrating a semi-infinite elastic half-space. Many coatings act as thin bonded elastic layers that undergo considerably higher pressures than those predicted by the classical theory. Furthermore, inelastic deformation of bonded solids can cause plastic flow, work-hardening, and elastoplastic behaviour. This paper presents a comprehensive, integrated contact mechanics analysis that includes induced sub-surface stresses in concentrated counterformal finite line contacts for all the aforementioned cases. Generated pressures and deformation are predicted for hard coated surfaces, for which there is a dearth of relevant analysis. The contact characteristics, which are of particular practical significance, of many hard, wear-resistant advanced coatings are also studied. The paper clearly demonstrates the importance of using efficient semi-analytical, detailed holistic contact mechanics rather than the classical idealised methods or empirical numerical ones such as FEA. The novel approach presented for the finite line contact of thin-layered bonded solids has not hitherto been reported in the open literature.","PeriodicalId":502914,"journal":{"name":"Lubricants","volume":"134 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141002103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on Sudden Unbalance Response of Rigid-Elastic-Oil Coupled Ball Bearings 刚性-弹性-油耦合球轴承的突发不平衡响应研究

Lubricants Pub Date : 2024-05-06 DOI: 10.3390/lubricants12050161

Yan Li, Yongcun Cui, Sier Deng

引用次数: 0

Influence of Nanoparticles in Lubricant on Sliding Contact of Atomic Rough Surfaces—A Molecular Dynamics Study 润滑剂中的纳米颗粒对原子粗糙表面滑动接触的影响--分子动力学研究

Lubricants Pub Date : 2024-05-06 DOI: 10.3390/lubricants12050160

Xuan Zheng, Lihong Su, Guanyu Deng

{"title":"Influence of Nanoparticles in Lubricant on Sliding Contact of Atomic Rough Surfaces—A Molecular Dynamics Study","authors":"Xuan Zheng, Lihong Su, Guanyu Deng","doi":"10.3390/lubricants12050160","DOIUrl":"https://doi.org/10.3390/lubricants12050160","url":null,"abstract":"In this work, large-scale molecular dynamics (MD) computational simulations were performed in order to explore the sliding contact responses of rough surfaces with hexadecane lubricant and added nanoparticles. Simulation results revealed that the frictional state was dependent on the fluid, nanoparticle, and surface roughness. Three lubricating conditions were compared based on considerations of different amounts of fluid molecules. The lubricant was not able to separate the frictional contact surfaces if the quantity of lubricant molecules was insufficient. Particularly, there were no lubricating contributions when the amount of lubricant was too low, and the lubricant therefore only filled the pits in the surface roughness. Thus, the normal load was primarily supported by the contact between the two surfaces and nanoparticles, leading to significant surface morphology changes. In contrast, the frictional contact surfaces were able to be completely separated by the lubricant when there was a sufficient amount of fluid, and a very good lubricating effect could thus be achieved, resulting in a smaller friction force. In addition, the changes in surface morphology, contact area, and RMS are discussed in this paper, in order to reveal the dynamic frictional process.","PeriodicalId":502914,"journal":{"name":"Lubricants","volume":"5 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141008036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-Temperature and High-Pressure Tribological Properties of Siliconized Graphite for Water-Lubricated Thrust Bearing Application in Main Coolant Pump 主冷却剂泵中水润滑推力轴承应用中硅化石墨的高温高压摩擦学特性

Lubricants Pub Date : 2024-05-03 DOI: 10.3390/lubricants12050159

Sihang Liu, Baojun Zhang, Long Cai, Weiguang Wang, Taihe Liang, Mingkai Lei

{"title":"High-Temperature and High-Pressure Tribological Properties of Siliconized Graphite for Water-Lubricated Thrust Bearing Application in Main Coolant Pump","authors":"Sihang Liu, Baojun Zhang, Long Cai, Weiguang Wang, Taihe Liang, Mingkai Lei","doi":"10.3390/lubricants12050159","DOIUrl":"https://doi.org/10.3390/lubricants12050159","url":null,"abstract":"The effect of the microstructure of siliconized graphite on tribological properties is investigated by using a high-temperature and high-pressure water-lubricated tribometer on a self-mated ring-on-ring configuration under an applied load of 500–1500 N with a spindle speed of 100–5000 rpm in both 90 °C (5 MPa) and 25 °C (1 MPa) water environments, respectively. The Stribeck curves measurement and continuous wear tests are performed and analyzed in both water environments. The wear behaviors of the graphite, SiC, and free-silicon phases in siliconized graphite are demonstrated to explore the wear mechanism. The larger wear depths of a low-worn surface roughness on the three phases contribute to the boundary lubrication. The shallower wear depths are observed on the SiC and Si phases under the mixed lubrication, corresponding to partial contact wear of surface asperities. The wavy surface of the SiC phase and uniform flow-oriented striae of the Si phase are attributed to hydrodynamic lubrication, caused by full water film scouring the worn surface. Finally, an integrated evaluation method of G duty parameters is successfully used to identify the lubrication regimes of siliconized graphite from the boundary, mixed, to hydrodynamic lubrications for a water-lubricated thrust bearing application in the main coolant pump of a nuclear power plant.","PeriodicalId":502914,"journal":{"name":"Lubricants","volume":"121 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141017370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Compatibility Study of Polyamide (PA6) with Lubricant Bases for Electric Vehicle Applications 电动汽车应用中聚酰胺 (PA6) 与润滑油基的兼容性研究

Lubricants Pub Date : 2024-02-15 DOI: 10.3390/lubricants12020054

Bernardo Tormos, Vicente Bermúdez, Adbeel Balaguer, Enrique Giménez

引用次数: 0

Compatibility Study of Polyamide (PA6) with Lubricant Bases for Electric Vehicle Applications 电动汽车应用中聚酰胺 (PA6) 与润滑油基的兼容性研究

Lubricants Pub Date : 2024-02-15 DOI: 10.3390/lubricants12020054

Bernardo Tormos, Vicente Bermúdez, Adbeel Balaguer, Enrique Giménez

引用次数: 0

A Comparison of the Tribological Properties of Two Phosphonium Ionic Liquids 两种膦离子液体的摩擦学特性比较

Lubricants Pub Date : 2024-02-14 DOI: 10.3390/lubricants12020053

J. Horng, Thi-Na Ta, R. Kreivaitis, J. Treinytė, A. Kupčinskas, M. Gumbytė

{"title":"A Comparison of the Tribological Properties of Two Phosphonium Ionic Liquids","authors":"J. Horng, Thi-Na Ta, R. Kreivaitis, J. Treinytė, A. Kupčinskas, M. Gumbytė","doi":"10.3390/lubricants12020053","DOIUrl":"https://doi.org/10.3390/lubricants12020053","url":null,"abstract":"For over two decades, ionic liquids have been among the most exciting lubrication topics. Ionic liquids were investigated by using them as neat lubricants and lubricity-enhancing additives. However, new and unique features were revealed by introducing new ionic liquids. This paper compares the tribological properties of two ionic liquids with the same trihexyltetradecylphosphonium [P 6,6,6,14] cation and different anions—dicyanamide [DCN] and bis(2,4,4-trimethylpentyl)phosphinate. The widely investigated 1-Butyl-3-methylimidazolium hexafluorophosphate [BMIM] [PF6] ionic liquid was used as a reference. The lubricity was comprehensively investigated using two testing modes: reciprocation in a ball-on-plate tribometer and continuous sliding in a ball-on-disc tribometer. The tests were performed at temperatures of 30 and 80 °C. The friction, wear, and film thickness were evaluated, and a worn surface analysis was conducted. It was found that in the case of reciprocation, anion has a significant effect on the lubricity. The difference was particularly evident when the results at two temperatures were compared. The ability to build a low-friction tribo-film was suggested as the primer source of lubricity. In the case of continuous sliding, the differences were not as noticeable. In this case, viscosity was assigned to be the leading property.","PeriodicalId":502914,"journal":{"name":"Lubricants","volume":"40 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139779624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Comparison of the Tribological Properties of Two Phosphonium Ionic Liquids 两种膦离子液体的摩擦学特性比较

Lubricants Pub Date : 2024-02-14 DOI: 10.3390/lubricants12020053

J. Horng, Thi-Na Ta, R. Kreivaitis, J. Treinytė, A. Kupčinskas, M. Gumbytė

{"title":"A Comparison of the Tribological Properties of Two Phosphonium Ionic Liquids","authors":"J. Horng, Thi-Na Ta, R. Kreivaitis, J. Treinytė, A. Kupčinskas, M. Gumbytė","doi":"10.3390/lubricants12020053","DOIUrl":"https://doi.org/10.3390/lubricants12020053","url":null,"abstract":"For over two decades, ionic liquids have been among the most exciting lubrication topics. Ionic liquids were investigated by using them as neat lubricants and lubricity-enhancing additives. However, new and unique features were revealed by introducing new ionic liquids. This paper compares the tribological properties of two ionic liquids with the same trihexyltetradecylphosphonium [P 6,6,6,14] cation and different anions—dicyanamide [DCN] and bis(2,4,4-trimethylpentyl)phosphinate. The widely investigated 1-Butyl-3-methylimidazolium hexafluorophosphate [BMIM] [PF6] ionic liquid was used as a reference. The lubricity was comprehensively investigated using two testing modes: reciprocation in a ball-on-plate tribometer and continuous sliding in a ball-on-disc tribometer. The tests were performed at temperatures of 30 and 80 °C. The friction, wear, and film thickness were evaluated, and a worn surface analysis was conducted. It was found that in the case of reciprocation, anion has a significant effect on the lubricity. The difference was particularly evident when the results at two temperatures were compared. The ability to build a low-friction tribo-film was suggested as the primer source of lubricity. In the case of continuous sliding, the differences were not as noticeable. In this case, viscosity was assigned to be the leading property.","PeriodicalId":502914,"journal":{"name":"Lubricants","volume":"370 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139839280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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 Graphene Nanoplatelet Content on Mechanical and Elevated-Temperature Tribological Performance of Self-Lubricating ZE10 Magnesium Alloy Nanocomposites 石墨烯纳米微粒含量对自润滑 ZE10 镁合金纳米复合材料机械性能和高温摩擦学性能的影响

Lubricants Pub Date : 2024-02-13 DOI: 10.3390/lubricants12020052

S. Kandemir, Sibel Yöyler, Rahul Kumar, Maksim Antonov, H. Dieringa

{"title":"Effect of Graphene Nanoplatelet Content on Mechanical and Elevated-Temperature Tribological Performance of Self-Lubricating ZE10 Magnesium Alloy Nanocomposites","authors":"S. Kandemir, Sibel Yöyler, Rahul Kumar, Maksim Antonov, H. Dieringa","doi":"10.3390/lubricants12020052","DOIUrl":"https://doi.org/10.3390/lubricants12020052","url":null,"abstract":"Magnesium (Mg) and graphene in alloy formulations are of paramount importance for lightweight engineering applications. In the present study, ZE10 Mg-alloy-based nanocomposites reinforced with graphene nanoplatelets (GNPs) having a thickness of 10–20 nm were fabricated via ultrasound-assisted stir casting. The effect of GNP contents (0.25, 0.5, and 1.0 wt.%) on the microstructure, Vickers hardness, and tensile properties of nanocomposites was investigated. Further, tribological studies were performed under a ball-on-disc sliding wear configuration against a bearing ball counterbody, at room and elevated temperatures of 100 °C and 200 °C, to comprehend temperature-induced wear mechanisms and friction evolution. It was revealed that the GNP addition resulted in grain coarsening and increased porosity rate of the Mg alloy. While the composites exhibited improved hardness by 20–35% at room temperature and 100 °C, a minor change was observed in their hardness and tensile yield strength values at 200 °C with respect to the GNP-free alloy. A notable improvement in lowering and stabilizing friction (coefficient of friction at 200 °C~0.25) and wear values was seen for the self-lubricating GNP-added composites at all sliding temperatures. The worn surface morphology indicated a simultaneous occurrence of abrasive and adhesive wear mode in all samples at room temperature and 100 °C, while delamination and smearing along with debris compaction (tribolayer protection) were the dominant mechanisms of wear at 200 °C. Inclusively, the results advocate steady frictional conditions, improved wear resistance, and favorable wear-protective mechanisms for the Mg alloy–GNP nanocomposites at room and elevated temperatures.","PeriodicalId":502914,"journal":{"name":"Lubricants","volume":"165 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139839896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0