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Eco-friendly polysaccharide coatings for antifouling and dragreduction and potential application for marine devices

Friction 2024年第4期12卷 726-744页

作者： Hao YANG Liguo QIN Wenhui ZHAO Fagla Jules MAWIGNON Hui GUO Yongkang WU Yali ZHANG guangneng dong Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Institute of Design Science and Basic ComponentsSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Biomedical Information of Ministry of Education School of Life Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Department of Endocrinology First Affiliated Hospital of Medical CollegeXi'an Jiaotong UniversityXi’an 710061China

Traditional antifouling agents usually have a certain toxic effect on marine environments and non-target *** this study,Dictyophora indusiata polysaccharide(DIP)was applied as a natural antifouling surface modifier to prepare the surface coating for marine *** DIP coatings were prepared:*** spore polysaccharide(DISP),*** volva polysaccharide(DIVP),and *** embryonic body polysaccharide(DIEP).The antifouling,tribological,and anticorrosion behavior of the coatings were *** revealed that the three kinds of DIP coatings had excellent antifouling properties,which could effectively prevent the adhesion of Chlorella and the attachment of water-based and oily stains on the ***,the coatings showed great mechanical stability and could maintain an extremely low coefficient of friction(COF<0.05)after continuous *** drag reduction rate of the coated surfaces reached 5%,showing a powerful lubrication ***,the DIP coatings presented an outstanding corrosion resistance,where the equivalent circuit impedances were 4-9 orders of magnitude higher than the control *** research showed a promising prospect of surface coating fabrication with DIP for marine devices to achieve the purpose of antifouling and drag reduction.

关键词： Dictyophora indusiata polysaccharide(DIP)coating antifouling anticorrosion lubrication and drag reduction

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水下湍流减阻技术研究进展

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表面技术 2024年第16期53卷 1-18页

作者：秦立果刘建波李航卢山马泽宇王征董光能西安交通大学现代设计及转子轴承系统教育部重点实验室西安710049

水下湍流减阻技术作为提升航行器航速、实现节能减排的有效手段,受到了学者的广泛关注。迄今,根据减阻机理的不同形成了多样化的减阻技术,依据能否对减阻行为进行调控可分为主动和被动减阻技术。从概述水下湍流减阻技术的研究现状出发,... 详细信息

水下湍流减阻技术作为提升航行器航速、实现节能减排的有效手段,受到了学者的广泛关注。迄今,根据减阻机理的不同形成了多样化的减阻技术,依据能否对减阻行为进行调控可分为主动和被动减阻技术。从概述水下湍流减阻技术的研究现状出发,梳理了各项减阻技术从兴起到当前研究热点的发展脉络。系统阐述了各减阻技术对壁面湍流流场的影响机制,并分类别深入分析了其内在减阻机理,如结构减阻的涡干扰、超疏水减阻的滑移,聚合物高分子链的黏弹性、超空泡的界面转换、柔顺壁面的缓冲吸振、微气泡改变流场理化特性和壁面振动破坏拟序结构等减阻机制。论述了各项减阻技术的研究进展,比较了各项技术的发展趋势和不足,如仿生减阻结构无需提供额外的能量就能维持长久的减阻效果,但对复杂多变的流场环境难以维持较高的减阻率;微气泡减阻能大幅降低表面阻力,但存在能耗较高等问题。在此基础上,总结概括了各项减阻技术的应用场景,并从技术集成的角度,展望了水下湍流减阻技术的发展之路。

关键词：减阻技术湍流结构减阻超疏水减阻微气泡减阻

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Origin of the tribofilm from MoS_(2) nanoparticle oil additives: Dependence of oil film thickness on particle aggregation in rolling point contact

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Friction 2021年第6期9卷 1436-1449页

作者： Hongxing WU Liping WANG guangneng dong State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China Petro China Lanzhou Lubricating Oil R&D Institute Lanzhou 730060China Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Xi'an Jiaotong UniversityXi'an 710049China

The lubrication effectiveness of MoS_(2) nanoparticles as an oil additive remains unclear,restricting its application in industry to reduce *** goal of this work was to explore the lubrication mechanism of MoS_(2) nanoparticles as an oil *** this study,the oil film thickness behaviors of MoS_(2) nanoparticles in poly-alpha olefin(PAO4)base oil,PAO4 with 3 wt%dispersant(polyisobutyleneamine succinimide,PIBS),and 0W20 engine oil were investigated using an elastohydrodynamic lubrication(EHL)testing *** the EHL tests,the flow patterns around the contact area and the tribofilm covering rate on contact area were studied using optical microscopy to understand the lubrication *** results indicate that both the dispersant and nanoparticle aggregation significantly affected the oil film *** expected oil film thickness increase in the case of 0.1 wt%MoS_(2) in PAO4 base oil was obtained,with an increase from 30 to 60 nm over 15 min at a velocity of 50 mm/*** pattern analysis revealed the formation of particle aggregation on the rolling path when lubricated with 0.1 wt%MoS_(2),which is associated with a tribofilm coverage rate of 41.5%on the contact ***,an oil film thickness increase and particle aggregation were not observed during the tests with 0.1 wt%MoS_(2) blended with 3 wt%PIBS as the dispersant in PAO4 base oil,and for 0.75 wt%MoS_(2) in 0W20 engine *** results suggest that nanoparticles responsible for tribofilm formation originated from aggregates,but not the well-dispersed nanoparticles in point *** understanding should aid the advancement of novel lubricant additive design.

关键词： nanoparticle lubrication oil film thickness flow pattern particle aggregation

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Friction and wear behavior of different seal materials under water-lubricated conditions

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Friction 2021年第4期9卷 697-709页

作者： Weigang ZHAO Guoyuan ZHANG guangneng dong School of Astronautics Northwestern Polytechnical UniversityXi’an 710072China School of Mechano-Electronic Engineering Xidian UniversityXi'an 710071China Key Laboratory of Modern Design and Rotor-bearing System of Ministry of Education Xi’an Jiaotong UniversityXi’an 710049China

The shaft mechanical face seal in a high-speed turbopump of a liquid rocket engine often operates under extremely harsh *** example,a low-temperature and low-viscosity fluid(such as liquid oxygen or liquid hydrogen)is used as a *** performance of the seal rings,especially the friction and wear behavior,directly determines whether the seal functions *** this study,the friction and wear behavior of several ring materials are tested using a pin-on-disk tribo-tester,and the wear morphology of the ring is *** friction coefficients(COFs)and mass-wear rates under dry-friction and water-lubricated conditions,which are used to simulate low-viscosity conditions,are *** results show that at a pressure-velocity(PV)value of 2.4 MPa-(m/s),the COF between the copper graphite(stator)and copper-chrome alloy disk(rotor)is low(with a value of 0.18)under the dry-friction conditions,and the 5-min wear mass of the copper graphite is approximately 2 *** the water-lubricated conditions,compared with other materials(such as copper-chrome alloy,S07 steel,alumina ceramic coating,and nickel-based calcium fluoride),the S07 steel with a diamond-like carbon film is preferred for use in a high-speed turbopump under extreme *** results of this study can provide theoretical and experimental guidance in the design of mechanical face seals in liquid rocket engines.

关键词： friction wear mechanical face seal water-lubricated high-speed turbopump

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Dry Friction and Wear Characteristics of Impregnated Graphite in a Corrosive Environment

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Chinese Journal of Mechanical Engineering 2014年第5期27卷 965-971页

作者： JIA Qian YUAN Xiaoyang ZHANG Guoyuan dong guangneng ZHAO Weigang Key Laboratory of Education Ministry for Modem Design and Rotor-bearing System Xi'an Jiaotong University School of Electromechanical Engineering Xidian University Xi'an Aerospace Propulsion Institute China Aerospace Science and Technology Corporation

Tribological properties of impregnated graphite are greatly influenced by preparation technology and working conditions and it’s highly susceptible to corrosion environmental impacts,but the experimental research about it are *** this paper,three kinds of impregnated graphite samples are prepared with different degree of graphitization,the tribological properties of these samples in the dry friction environment and in a corrosive environment are analyzed and *** tribo-test results show that the friction coefficient of samples is reduced and the amount of wear of samples increase when the graphitization degree of samples increases in dry friction *** in a corrosive environment（samples are soaked N2O4）,the friction coefficient and amount of wear are changed little if the graphitization degree of samples are *** the degree of graphitization increase,the friction coefficient and amount of wear of samples increase too,the amount of wear is 2 to 3 times as the samples tested in the non-corrosive environment under pv value of 30MPa？m/*** impregnated graphite,which friction coefficient is stable and graphitization degree is in mid level,such#2,is more appropriate to have a work in the corrosion *** this paper,preparation and tribological properties especially in corrosive environment of the impregnated graphite is studied,the research conclusion can provide an experimental and theoretical basis for the selection and process improvement of graphite materials,and also provide some important design parameters for contact seal works in a corrosive environment.

关键词： corrosive environment impregnated graphite graphitization dry friction coefficient of friction amount of wear

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Tribological behaviors of spot-textured TiN coatings on M2 high-speed steel under boundary lubricated conditions

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Journal of University of Science and Technology Beijing 2007年第4期14卷 350-355页

作者： guangneng dong Meng Hua Jian Li Hing-Yin Ma Youbai Xie Lubrication Theory and Bearing Institute Key Laboratory of the Education Ministry for Modern Design and Rotor-Bearing System Xi＇an Jioatong University Xi＇an 710049 China Department of Manufacturing Engineering and Engineering Management City University of Hong Kong 83 Tat Chee Avenue Kowloon Tong Kowloon Hong Kong China Wuhan Research Institute of Materials Protection Wuhan 430030 China

The effect of sliding duration on the tribological behaviors of spot patterned coatings was investigated. Two patterns based on physical vapor deposition （PVD） TiN coatings were used, such as, in-lined （IN） and staggered （ST） spots. The tribological behaviors were evaluated by using a Cameron-Plint wear test rig. The M2 steel discs deposited TiN coatings with IN and ST patterns slid against the ASSAB 17 tool steel pins at a speed of 0.23 m/s, in Shell Tellus T32 lubricant and were loaded with 900 N. The testing results on disc specimens with two types of PVD TiN spot patterns, all coated with a bias voltage of-180 V and slid for 4, 8 and 11 h respectively, were presented. The results revealed that the in-lined coatings possessed relatively better wear behaviors than the staggered pattern coatings. Mechanisms for such superiority and for the cause of peeling were discussed. A relevant design approach was suggested for the application of such patterned coatings.

关键词： vapor deposited coating texture friction wear boundary lubrication

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人工关节材料表面仿生树状分叉网络的润滑研究

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西安交通大学学报 2022年第2期56卷 66-73页

作者：任荣杰董光能西安交通大学现代设计及转子轴承系统教育部重点实验室西安710049

为提高人工关节假体材料(钛合金/超高分子量聚乙烯配副)的耐磨性,研究了材料仿生树状分叉网络织构的液体铺展流动性能与摩擦学性能。根据分支数与分支角不同,分别设计了3类仿生树状分叉网络织构(十字型网络、T型网络、Y型网络),每类树... 详细信息

为提高人工关节假体材料(钛合金/超高分子量聚乙烯配副)的耐磨性,研究了材料仿生树状分叉网络织构的液体铺展流动性能与摩擦学性能。根据分支数与分支角不同,分别设计了3类仿生树状分叉网络织构(十字型网络、T型网络、Y型网络),每类树状网络织构分别制备成织构率为10%、15%、20%的3种试样。通过试验,评价了树状网络的液体铺展流动性和摩擦学性能,结果发现:3种织构表面均可以降低瞬时接触角和实现液体完全铺展,并具有较好的减摩性能;Y型网络织构具有最好的液体铺展流动性能,2μL的液体在10%织构率时瞬时接触角为23.37°,仅0.95 s可以完全铺展;T型网络织构在15%织构率时摩擦系数仅为0.077,较原始表面降低了38%。研究内容对人工关节自润滑减摩设计具有重要参考意义。

关键词：人工关节树状分叉织构钛合金接触角摩擦学性能

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Molecular dynamics simulation of the deposition process of hydrogenated diamond-like carbon (DLC) films

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Chinese Science Bulletin 2008年第7期53卷 1094-1099页

作者： ZHANG Yujun dong guangneng MAO JunHong XIE YouBai Theory of Lubrication and Bearing Institute Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Xi'an Jiaotong University Xi'an 710049 China

The deposition process of hydrogenated diamond-like carbon (DLC) film greatly affects its frictional properties. In this study, CH3 radicals are selected as source species to deposit hydrogenated DLC films for molecular dynamics simulation. The growth and structural properties of hydrogenated DLC films are investigated and elucidated in detail. By comparison and statistical analysis, the authors find that the ratio of carbon to hydrogen in the films generally shows a monotonously increasing trend with the increase of impact energy. Carbon atoms are more reactive during deposition and more liable to bond with substrate atoms than hydrogen atoms. In addition, there exists a peak value of the number of hydrogen atoms deposited in hydrogenated DLC films. The trends of the variation are opposite on the two sides of this peak point, and it becomes stable when impact energy is greater than 80 eV. The average relative density also indicates a rising trend along with the increment of impact energy, while it does not reach the saturation value until impact energy comes to 50 eV. The hydrogen content in source species is a key factor to determine the hydrogen content in hydrogenated DLC films. When the hydrogen content in source species is high, the hydrogen content in hydrogenated DLC films is accordingly high.

关键词：分子动力学沉积程序氢化作用 DLC 薄膜

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Performance Deterioration Analysis of the Used Gear Oil

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Advances in Chemical Engineering and Science 2016年第2期6卷 67-75页

作者： Qunfeng Zeng guangneng dong Yanling Yang Tonghai Wu Key Laboratory of Ministry of Education for Modern Design and Rotor-Bearing System Xi’an Jiaotong University Xi’an China Jiangxi Key Laboratory of Advanced Copper and Tungsten Materials Jiangxi Academy of Science Nanchang China

In the present paper, we have investigated the tribological properties and microstructure of the used gear oil theoretically and experimentally. The deterioration process of the in-service gear lubricant oils was also discussed. The viscosity and microstructure of oils running different mileages were analyzed by viscometer and Fourier Transform Infrared Spectroscopy (FTIR), respectively. In addition, the friction and wear behaviors of the friction pair of the GCr15 steel ball and disc were investigated using a ball on disc tribometer under different mileages’ gear oils lubrication conditions. These techniques give reproducible and reliable data with which to evaluate the severity of deterioration process of oils. The objective of this work is to understand the deterioration process of gear oil and analyze the influence of deterioration on the performance and microstructure of lubricant oils used in gear box. Possible explanations of deterioration process as well as its influence on friction and wear behaviors are also discussed. The results reveals the tribological properties of used oils depended on strongly the microstructure and its deterioration process of oil.

关键词： Used Gear Oil Tribological Properties Viscosity FTIR Deterioration

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可用于人工关节润滑的水凝胶蠕变缓释性能及理论模型

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西安交通大学学报 2022年第6期56卷 97-103页

作者：阮春标胡经纬袁恒迪郭培哲董光能西安交通大学现代设计及转子轴承系统教育部重点实验室西安710049

针对人工关节润滑液难以定量供给导致假体表面磨损严重的问题,提出一种水凝胶关节囊结构来供给和保存关节润滑液的方法,并进行了试验探究和理论验证。首先,制备了含透明质酸琼脂糖水凝胶,在生理盐水浸润环境中对其进行了体外无侧限压缩... 详细信息

针对人工关节润滑液难以定量供给导致假体表面磨损严重的问题,提出一种水凝胶关节囊结构来供给和保存关节润滑液的方法,并进行了试验探究和理论验证。首先,制备了含透明质酸琼脂糖水凝胶,在生理盐水浸润环境中对其进行了体外无侧限压缩蠕变缓释试验,得到了蠕变体积和介质释放量与压力的关系曲线,并得出蠕变体积与介质释放量的转换公式。然后,根据水凝胶的结构和性质,建立了耦合扩散和大变形理论的本构模型,在给定压力的情况下通过该模型可得到水凝胶蠕变仿真曲线,最后结合试验得到的转化公式,可推导出水凝胶介质缓释量。采用一种将试验结果与有限元建模和优化方法相结合的有限元逆向法技术,得到了试件的相关材料参数,使用该参数对不同压力下的蠕变行为进行了仿真验证,结果表明:含透明质酸琼脂糖水凝胶在恒定压力作用下蠕变缓释量正比于蠕变体积;在给定压力和作用时间的情况下,耦合扩散和大变形理论模型可以在误差允许范围内定量预测含透明质酸琼脂糖水凝胶的缓释量。该研究成果可为未来水凝胶作为人造关节囊实现人工关节定量润滑提供参考。

关键词：人工关节润滑液水凝胶蠕变缓释有限元法

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