Tribology International最新文献

{"title":"Boriding effect on CrFeMnNbNi high entropy alloy: Microstructure, micro-nano properties, wear behaviour","authors":"Dilara Atam ,&nbsp;Sefa Emre Sunbul ,&nbsp;Kursat Icin ,&nbsp;Kadir Mert Döleker ,&nbsp;Mustafa Sabri Gök ,&nbsp;Azmi Erdoğan","doi":"10.1016/j.triboint.2024.110410","DOIUrl":"10.1016/j.triboint.2024.110410","url":null,"abstract":"<div><div>This study is dedicated to determine the effect of boriding treatment on CrFeMnNbNi alloy. Three phases (Laves, FeNi, FeCr) were determined in the HEA microstructure in accordance with thermodynamic calculations. After the boriding process, a 30–35 µm thick metallic boriding layer was formed on the surface. Thanks to boride layer, the hardness increased approximately 5 times, reaching up to 2800 HV. In nanoindentation tests performed on HEA, hardness and reduced elastic modulus were highest in the Laves phase (10.9–190 GPa) and lowest in the FeNi phase (2.74–128 GPa). These values reached their highest values (24–302 GPa) in the boride layer. In wear tests, it has been shown that boriding directly affects wear losses and reduces them by up to 96 %.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"203 ","pages":"Article 110410"},"PeriodicalIF":6.1,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142699032","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":"Effects of periodic structures on friction-induced vibrations in catenary-pantograph systems","authors":"Yuki Amano ,&nbsp;Shigeyuki Kobayashi ,&nbsp;Yoshitaka Yamashita ,&nbsp;Hirotoshi Uji ,&nbsp;Hiroshi Yabuno","doi":"10.1016/j.triboint.2024.110406","DOIUrl":"10.1016/j.triboint.2024.110406","url":null,"abstract":"<div><div>Friction-induced vibration in catenary-pantograph systems is a well-known instability phenomenon that has not been sufficiently investigated. This instability accelerates the wear of contact wires and requires a train driver to confirm safety, which leads to train delays. Therefore, it is important to elucidate the instability mechanisms and establish countermeasures. To address this issue, we conducted experiments using a real pantograph and a test facility that can simulate sliding conditions by rotating a rigid disk. These experiments characterized the instability reported in actual rail operations. Furthermore, numerical investigations found that the experimental results could be explained by assuming Coulomb friction for an experimentally validated pantograph model. However, this previous study did not examine the effects of the periodic catenary structures or propose countermeasures for their instability contribution. In this study, experiments and simulations based on actual equipment were conducted to investigate the effects of periodic structures. The simulations integrated a finite element method-based catenary model with a flexible multibody dynamics-based pantograph model. The experimental and numerical investigations clarified that the instability is caused by the asymmetry of the stiffness matrix due to Coulomb friction, and that standing waves formed in the contact wires between hangers significantly affect stability. Furthermore, the results suggested that these waves could be the basis of countermeasures for preventing instability. These results can contribute to the design of catenaries and pantographs with improved stability.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"203 ","pages":"Article 110406"},"PeriodicalIF":6.1,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A heat transfer model for thermal distortions in high speed spiral groove gas lubricated face seals","authors":"Chunhong Ma ,&nbsp;Shaoxian Bai","doi":"10.1016/j.triboint.2024.110408","DOIUrl":"10.1016/j.triboint.2024.110408","url":null,"abstract":"<div><div>The thermal distortions of seal face caused by heat transfer directly affect the stability of seal operation. Here, a heat transfer analysis model of spiral groove gas face seal is established taking account of gas compressibility and choked flow effect. Then, a thermoelastohydrodynamic lubrication (TEHL) analysis is carried out based on the proposed heat transfer model, frictional heat flux, surface conduction heat flux, and film adsorption heat flux are calculated, and face distortions are also analyzed under different operating parameters including rotational speed, seal temperature and seal pressure. It is shown that, the adsorption heat induced by gas expansion makes the film cooling, which often leads complex temperature distributions and plays an important and non-ignored role in thermal distortions. For the spiral groove face seal, the increase of seal pressure and rotational speed makes the adsorption heat increase significantly due to pumping effect of grooves. The more important is that the thermal distortions may be controlled by changing seal width. Here, for the spiral groove face seal, the clearance can transfer divergent to convergent with increasing seal width from 5 mm to 13.1 mm. This provides a potential way for distortion control in gas face seal design.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"203 ","pages":"Article 110408"},"PeriodicalIF":6.1,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142699036","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":"Grain-scale microtribological behavior of VCoNi medium-entropy alloy","authors":"Fangyuan Wang ,&nbsp;Beibei Lv ,&nbsp;Qinglong Chen ,&nbsp;Shaogang Cui ,&nbsp;Yongjian Wang ,&nbsp;Hui Wang ,&nbsp;Min Song ,&nbsp;Zhangwei Wang ,&nbsp;Wenzhen Xia","doi":"10.1016/j.triboint.2024.110412","DOIUrl":"10.1016/j.triboint.2024.110412","url":null,"abstract":"<div><div>The tribological behavior of equiatomic face-centered cubic (FCC) VCoNi medium-entropy alloy (MEA) remains underexplored despite of the alloy’s notable tensile strength and ductility. In this study, the tribological performance of VCoNi MEA is investigated using microscratching techniques, with emphasis on the effects of grain orientation, normal force, and scratch velocity. The study has demonstrated that the grain orientation in VCoNi MEA determines the activation of slip systems during the scratching processes, which significantly affects the morphology of wear tracks, slip steps and pile-up, as well as changes in microtribological behavior. As the normal force increases, the degree of wear intensifies, which is attributed to the significant material pile-up and more intense plastic flow. The plastic deformation of VCoNi MEA is found to be independent of scratch velocity within the 0.1–2 µm/s range. Ploughing and micro-shearing are identified as the primary wear mechanisms under various friction conditions. Furthermore, during the ploughing process, the deformation mechanism of the alloy is still dominated by dislocations. The direction of dislocation motion aligns with the direction of pile-up resulted from plastic deformation. The present study offers critical insights into the tribological behavior of medium-entropy alloys and broadens the potential for their applications in friction-intensive environments.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"203 ","pages":"Article 110412"},"PeriodicalIF":6.1,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698930","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":"3D TiO2 foam-supported Ni–B-La films for superior anti-corrosive and tribo-mechanical performances","authors":"Yun Guo ,&nbsp;Xiaowei Zhou ,&nbsp;Zhou Lu ,&nbsp;Jicheng Gao","doi":"10.1016/j.triboint.2024.110409","DOIUrl":"10.1016/j.triboint.2024.110409","url":null,"abstract":"<div><div><u>Herein the self-lubricating Ni-B-La films were deposited onto porous surfaces of Ti substrate to modify its surface defects like low hardness, poor wear resistance, etc.</u> The anodized titanium oxides (ATO) surfaces within 3D foam-like nanoporous textures were created for pinning growth by low-temperature electroless Ni-B nanocrystals to increase the interfacial strength. Specifically, the impact of LaCl₃ addition and aging temperatures on structural and tribo-mechanical characteristics of Ni-B-La films were assessed. The results validated that, instead of the cauliflower-like cellular, the inclusion of La³⁺ in<!--> <!-->plating bath was favorable for a flat surface within microcrystal textures. Through aged at 350 °C, it depicted the highest microhardness of 1163.6HV_0.1 and the lowest coefficients of friction (COF) value of ∼0.12 for Ni-B-La (3 g/L LaCl₃) samples. Additionally, the wear rate of Ni-B-La films was lower than 1.76 × 10⁻³ mm³·N⁻¹·m⁻¹, reducing by 667.1 % and 133.0 % than those of Ti substrate and Ni-B alloys. Both the precipitations of hard Ni_xB particles and La-rich oxides resulted in the self-lubricating surfaces. <u>Our work offers exceptional prospects for La-doped Ni-B films towards porous surfaces, allowing to satisfy the surface functional of Ti-based engineering applications under dry friction conditions.</u></div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"203 ","pages":"Article 110409"},"PeriodicalIF":6.1,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698934","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":"Effects of urea-functionalized MoS2 on hydrophilic lubrication","authors":"M. Humaun Kabir ,&nbsp;Darrius Dias ,&nbsp;SMH Marjuban ,&nbsp;Mohd Avais ,&nbsp;Homero Castaneda ,&nbsp;Hong Liang","doi":"10.1016/j.triboint.2024.110384","DOIUrl":"10.1016/j.triboint.2024.110384","url":null,"abstract":"<div><div>The challenge of achieving effective lubrication in polar lubricants like Water, Ethylene Glycol (EG), and Glycerol has driven the search for advanced lubricant additives. Traditional MoS₂, while widely used in nonpolar lubricants, suffers from poor dispersion stability and inconsistent performance in polar solvents due to its hydrophobic nature. This study addresses those issues by functionalizing MoS₂ with urea (U-MoS₂) to improve its compatibility with polar lubricants. U-MoS₂ was synthesized through a two-step process involving oxidation followed by urea functionalization. The results show that U-MoS₂ significantly enhances dispersion stability, maintaining a uniform suspension for over 30 days. Rheological analysis revealed that U-MoS₂ reduced the viscosity of Water, while in EG and Glycerol, it caused a slight increase in viscosity across the temperature range of 25 to 80 °C. Tribological experiments revealed a substantial reduction in the coefficient of friction (COF) for U-MoS₂-enhanced lubricants. In Water-based systems, the COF was reduced by 84 %, dropping to 0.057 with U-MoS₂. In EG and Glycerol-based systems, the COF reductions were 41 % and 38 %, respectively. Additionally, wear rate analysis demonstrated an 81 % reduction in wear for Water after introducing U-MoS₂, a 51 % reduction for EG, and a 69 % reduction for Glycerol. Wear surface analysis first revealed the presence of a consistent MoS₂ film on the contact surfaces, contributing to the observed reduction in wear and friction. These outcomes suggest that the urea molecule plays a key role in enhancing the adhesion of MoS₂ to the substrate and facilitates the formation of a stable lubricating layer. By addressing the limitations of traditional MoS₂ in polar solvents, this research aims to understand how polar functionalization can improve the performance of MoS₂ in hydrophilic lubrication, potentially expanding its applications across various industrial sectors.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"203 ","pages":"Article 110384"},"PeriodicalIF":6.1,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142699034","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":"Erosive wear behavior of sandstone under low-pressure pulsating water jet","authors":"Leona Vavro ,&nbsp;Martin Vavro ,&nbsp;Akash Nag ,&nbsp;Dagmar Klichová ,&nbsp;Gabriel Stolárik ,&nbsp;Munish Kumar Gupta ,&nbsp;Sergej Hloch","doi":"10.1016/j.triboint.2024.110411","DOIUrl":"10.1016/j.triboint.2024.110411","url":null,"abstract":"<div><div>The consequences of erosion caused by the mutual interaction of water droplets with sedimentary rock such as sandstone are not satisfactorily elucidated in the literature. This topic is important from many points of view, and its practical applications include the protection of cultural heritage or the targeted removal of material. This study assessed the wear rates on Božanov sandstone caused by multiple-droplet impingement, with water droplet impact speeds of <em>v</em> = 58 m/s, 92 m/s and 127 m/s corresponding to supply pressure of <em>p</em> = 2, 5 and 10 MPa, respectively. As a droplet generator, a pulsating water jet with a frequency of 20 kHz was used. Water droplets determined by a nozzle diameter <em>d</em> = 1 mm were distributed along a linear trajectory three times for each run. The water droplet impact density was varied by changing the traverse speed. In order to investigate the development of integrity damage, the samples were scanned using a digital microscope. Material loss was determined via weighing and compared using a non-contact measuring method. The results showed that the erosion responses, such as erosion depth and volume removed, increased with an increase in the supply pressure and a decrease in traverse speed. Moreover, it was found that at the lowest supply pressure <em>p</em> = 2 MPa, the effect of the number of drops density is invariant for traverse speeds in the range of 1–10 mm/s. When the pressure was increased from 5 to 10 MPa, the material removal values tripled. This significant increase may be attributed to the formation of an abrasive pulsating water stream within the created groove.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"203 ","pages":"Article 110411"},"PeriodicalIF":6.1,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142699037","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 behavior of polycrystalline diamond compacts under alternating high and low temperature conditions in vacuum environment","authors":"Xuejiao Sun ,&nbsp;Baochang Liu ,&nbsp;Shuai Zhang ,&nbsp;Xueqi Wang ,&nbsp;Sixu Zhao ,&nbsp;Wenhao Dai ,&nbsp;Jianbo Tu","doi":"10.1016/j.triboint.2024.110404","DOIUrl":"10.1016/j.triboint.2024.110404","url":null,"abstract":"<div><div>The tribological behaviors of polycrystalline diamond compact (PDC) under alternating high and low temperature conditions in vacuum environment were evaluated by a ball-on-disk tribometer. The wear surface features and chemical composition were measured by FIB-SEM-Raman-TOF-SIMS microanalyzer (SEM, EDS, Raman), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results showed that the coefficient of friction (COF) was pretty low and stable at atmospheric room temperature condition, while it was much higher and fluctuated in vacuum environment with alternating high and low temperature condition. In atmospheric environment with room temperature, the continuous formation of adsorbed films on the contact surface kept the chemical composition of the friction pair virtually unchanged, and the wear mechanism was a combination of mild abrasive wear and oxidative wear. In vacuum environment with alternating high and low temperature condition, the adsorbed film on the contact surface desorbed and could not continue to form, and the adhesion of Si₃N₄ materials occurred on the wear area and the Si-C bonds were formed. In addition, a combination of high friction heat, localized flash temperature and Co binder led to the graphitization of diamond. The wear mechanism was a combination of abrasive wear and adhesive wear. The above results showed that the adhesion of Si₃N₄ and the Si-C bonds led to high friction force, while the graphitization phenomenon weakened the bonding force between diamond grains, and made them more likely to be detached during the sliding. These were the mainly reasons for the severe wear under vacuum environment with alternating high and low temperature condition.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"203 ","pages":"Article 110404"},"PeriodicalIF":6.1,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142699033","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":"Remarkable wear resistance in ceramic-metal composites with composition gradients and regionalized heterostructures","authors":"Guanyu He ,&nbsp;Yilong Liang ,&nbsp;Peng Chen","doi":"10.1016/j.triboint.2024.110407","DOIUrl":"10.1016/j.triboint.2024.110407","url":null,"abstract":"<div><div>Ceramic–metal composites undergo a predominant mode of wear failure known as brittle intergranular fracture caused by strain localization. In this work, we report for the first time the employment of heterostructures to alter the failure mode of frictional interfaces within such composites. We achieve this by integrating fine-grained tungsten carbide (WC)/graphene nanoplates (GNPs) into the surface layer of coarse-grained WC–11 wt%Co cemented carbides, constructing a gradient heterostructure that simultaneously possessed fine-grained, binder phase, GNPs composition gradients, and regionalized heterostructure of coarse and fine grains. This structure yielded extraordinary wear resistance, outperforming gradient-structured cemented carbides and decreasing the wear rate of the WC-11 wt% Co cemented carbides surface by an order of magnitude. The multi-typed gradient structure improved the resistance of the composite to frictional loads along with fracture resistance. During dry sliding, the heterostructure facilitated strain hardening and transfer by activating dislocations and stacking fault networks. Moreover, the pilling ups of high-density geometrically necessary dislocations of types <span><math><mrow><mfenced><mrow><mi>a</mi></mrow></mfenced></mrow></math></span>, <span><math><mrow><mfenced><mrow><mi>c</mi></mrow></mfenced></mrow></math></span>, and <span><math><mrow><mfenced><mrow><mi>a</mi><mo>+</mo><mi>c</mi></mrow></mfenced></mrow></math></span> within the constrained coarse-grained WC increased the strain tolerance and promoted plastic deformation uniformity. This synergistic effect enabled the frictional interface to accommodate elastoplastic deformation induced by frictional stresses, thereby preventing localized brittle fractures. The proposed approach paves a novel pathway for designing wear-resistant ceramic–metal composites.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"203 ","pages":"Article 110407"},"PeriodicalIF":6.1,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698309","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":"Enhanced tribological performance of NiAl-based composite coatings: Design of the composition in coatings by addition of Mo and Nanodiamond","authors":"Yanwen Sun ,&nbsp;Jianhui Yuan ,&nbsp;Min Wang ,&nbsp;Hanyu Wang ,&nbsp;Zhongyuan Chen ,&nbsp;Xingyu Liu ,&nbsp;Shaowei Li ,&nbsp;Weiwen Zhao ,&nbsp;Jingyi Yang","doi":"10.1016/j.triboint.2024.110405","DOIUrl":"10.1016/j.triboint.2024.110405","url":null,"abstract":"<div><div>Nanodiamond/Mo reinforced in-situ synthesized NiAl-based composite coatings were prepared by laser cladding. The microstructure, microhardness, and tribological properties of these composite coatings were studied. The results show that the coating is mainly composed of NiAl and Ni₃Al phases. ND and Mo show a synergistic effect, which not only reduces the porosity of the coating, refines the grain size, and also improves the microhardness. In addition, in the temperature range of 25–800 °C, they reduce the friction coefficient and wear rate of the coating. These findings provide a valuable reference for optimizing the performance of NiAl-based composite coatings.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"203 ","pages":"Article 110405"},"PeriodicalIF":6.1,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142699031","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}