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Littérature scientifique sur le sujet « Lubrication free »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 10 février 2022

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Articles de revues sur le sujet "Lubrication free"

Hou, Jiapeng, Deepak H. Veeregowda, Joop de Vries, Henny C. Van der Mei, and Henk J. Busscher. "Structured free-water clusters near lubricating surfaces are essential in water-based lubrication." Journal of The Royal Society Interface 13, no. 123 (2016): 20160554. http://dx.doi.org/10.1098/rsif.2016.0554.

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Water-based lubrication provides cheap and environmentally friendly lubrication and, although hydrophilic surfaces are preferred in water-based lubrication, often lubricating surfaces do not retain water molecules during shear. We show here that hydrophilic (42° water contact angle) quartz surfaces facilitate water-based lubrication to the same extent as more hydrophobic Si crystal surfaces (61°), while lubrication by hydrophilic Ge crystal surfaces (44°) is best. Thus surface hydrophilicity is not sufficient for water-based lubrication. Surface-thermodynamic analyses demonstrated that all sur

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Kong, Ning, Kiet Tieu, Hong Tao Zhu, Qiang Zhu, and Peter Gandy. "Effects of Lubrication in Ferrite Rolling of Interstitial Free Steel." Materials Science Forum 773-774 (November 2013): 186–91. http://dx.doi.org/10.4028/www.scientific.net/msf.773-774.186.

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Ferrite rolling of interstitial free steel strip in the temperature range 650-850°C can effectively reduce furnace costs and scale formation as a result of lower strip reheating temperatures. Different lubrication conditions of lubricating oil, solid lubricant and dry condition were used during ferrite rolling tests of thin interstitial free steel strip on a 2-high Hille 100 experimental rolling mill. Different rolling speed, rolling temperature and reductions were applied to the rolling process. The rolling force and roll roughness were affected by the lubrication conditions and rolling param

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Qin, Zhaoju, Chenheng Yuan, Yanpeng Yuan, and Yuanyuan Huang. "Tribological characteristics of piston rings in a single-piston hydraulic free-piston engine." Industrial Lubrication and Tribology 69, no. 2 (2017): 131–41. http://dx.doi.org/10.1108/ilt-01-2015-0011.

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Purpose A free-piston engine (FPE) is an unconventional engine that abandons the crank system. This paper aims to focus on a numerical simulation for the lubricating characteristics of piston rings in a single-piston hydraulic free-piston engine (HFPE). Design/methodology/approach A time-based numerical simulation program was built using Matlab to define the piston motion of the new engine. And a lubrication mode of piston rings was built which is based on the gas flow equation, hydrodynamic lubrication equation and the asperity contact equation. The piston motion and the lubrication model are

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Özkan, Doğuş, M. Barış Yağci, Özgür Birer, and Hakan Kaleli. "Comparison of tribological performances of sulfur based and boron succuminide containing antiwear additive with ZDDP by engine bench tests." Industrial Lubrication and Tribology 68, no. 4 (2016): 482–96. http://dx.doi.org/10.1108/ilt-11-2015-0173.

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Purpose This study aims to evaluate and compare by 100 hours engine bench tests the tribological performances of two types of lubrication oils, which were sulfur-based, boron succinimide-containing antiwear package (NP-3) oil and conventional zinc dialkyldithiophosphate (ZDDP)-containing (R-1) oil. Design/methodology/approach The tribological performances of the oils were evaluated in three main contexts, including engine tests, physical/chemical changes and surface analysis. Findings Results showed that NP-3 lubrication oil, which was environment- and catalyst-friendly, can be an alternative

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You, Dong Sheng. "The Achievement of Intelligent Lubrication Adjustment Function of CNC Machine Tools Based on SSAS." Applied Mechanics and Materials 556-562 (May 2014): 1454–59. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.1454.

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The use of CNC machine tools signal acquisition, two-way transmission of the temperature sensor data, the ladder design and macro program guide and other methods on the implementation of a temperature sensing system of smart lubrication function. It is not only low-end CNC machine tools can compensate for deficiencies in equipment protection features and maintenance-free function, but also enhance the diversity of processing. Ultimately by analyzing the different lubrication mode, the relationship between the lubricating oil pressure and temperature and other factors, to draw the function in t

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Petrushin, A. D., O. L. Ignat’Ev, and D. V. Glazunov. "Device for lubrication of open friction units." Vestnik of the Railway Research Institute 76, no. 6 (2017): 348–53. http://dx.doi.org/10.21780/2223-9731-2017-76-6-348-353.

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The article considers the problem of increased wear of the wheel-rail pair. An effective solution to this problem is the use of technical means of lubrication, which ensure a reduction in the wear rate of the crests of rolling stock wheels. Based on the survey of modern foreign and domestic lubrication devices and technologies, the main types of flange lubrication systems are identified: onboard (on rolling stock), track stationary, mobile rail-lubricators. The main shortcomings of the existing lubrication systems have been identified: the complexity of the construction of flange lubrication s

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Kawada, Shouhei, Seiya Watanabe, Ryo Tsuboi, Shinya Sasaki, and Braham Prakash. "Lubrication Mechanism of Halogen-Free Ionic Liquids." Tribology Online 12, no. 4 (2017): 155–61. http://dx.doi.org/10.2474/trol.12.155.

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Cohen, Sara A. "A free boundary problem in lubrication theory." Journal of Mathematical Analysis and Applications 126, no. 1 (1987): 116–29. http://dx.doi.org/10.1016/0022-247x(87)90080-1.

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Yang, Jongin, M. M. Khonsari, and Alan Palazzolo. "CFD investigation of oil-free granular lubrication." Tribology International 164 (December 2021): 107238. http://dx.doi.org/10.1016/j.triboint.2021.107238.

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DellaCorte, Christopher, Antonio R. Zaldana, and Kevin C. Radil. "A Systems Approach to the Solid Lubrication of Foil Air Bearings for Oil-Free Turbomachinery." Journal of Tribology 126, no. 1 (2004): 200–207. http://dx.doi.org/10.1115/1.1609485.

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Foil air bearings are self-acting hydrodynamic bearings which rely upon solid lubricants to reduce friction and minimize wear during sliding which occurs at start-up and shut-down when surface speeds are too low to allow the formation of a hydrodynamic air film. This solid lubrication is typically accomplished by coating the nonmoving foil surface with a thin, soft polymeric film. The following paper introduces a systems approach in which the solid lubrication is provided by a combination of self lubricating shaft coatings coupled with various wear resistant and lubricating foil coatings. The

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Thèses sur le sujet "Lubrication free"

Stískal, Petr. "Bezúdržbový svislý soustruh." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230131.

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This master’s thesis is aimed at the lubrication of machina tools. There are described the basic type sof lubrication systems, design of maintenance-free lubricated vertical lathe and technical-economic evaluation. The last section is devoted to the design proces.

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Knowles, Sean William. "An Investigation of Foil Thickness on Performance for Oil – Free Bearings." Cleveland, Ohio : Case Western Reserve University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1237480316.

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Gebretsadik, Daniel. "Tribological Behaviour of Pb-free Engine Bearing Materials." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16981.

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Engine bearings are amongst the most critical components of an internal combustion engine that support and allow smooth rotation of the crankshaft. They are designed to operate under hydrodynamic lubrication condition where the bearing and shaft surface are separated by a thick lubricant film. However, they also occasionally operate under mixed and boundary lubrication conditions particularly during starting, stopping and load, speed and temperature variations. Under these conditions, tribological performance of bearing materials is crucial for the satisfactory performance of theengine. Tradit

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Mazraeh, Amin. "Sliding Wear Behavior of Self-Mated Carbide-free Bainitic Steels." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70743.

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Axelsson, Erik, and Samuel André. "Studie av smörjsystem." Thesis, Örebro universitet, Akademin för naturvetenskap och teknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-16098.

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Målet med detta arbete är att undersöka smörjsystemet på två utsatta leder på en Boomer E2C. Förfrågan om examensarbetet kommer från Atlas Copco Rock Drills AB i Örebro som också tillverkar maskinen. Atlas Copco Rock Drills AB har idag ett fettsmörjningssystem som upprätthåller funktionerna på lederna. Uppgiften är att sammanfatta och utvärdera dagens system samt att finna nya lösningsförslag som skulle kunna ersätta eller delvis ersätta systemet. Information har hämtats från dokumentation, ritningar och samtal med konstruktörer på företaget. Efter att alla förutsättningarna för lederna specif

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Vedantha, Krishna Amogh, and Vijeth Venkataram Reddy. "LEAD FREE BRASS : Study and Analysis of the surface integrity of lead brass and unleaded brass." Thesis, Högskolan i Halmstad, Maskinteknisk produktframtagning (MTEK), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-29226.

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The addition of lead to the copper alloys increases its machinability and reducesthe overall production cost, despite copper being expensive, which makes achallenging task to replace lead. But the alarming effects of lead on human healthand the recycling problems has led to the increase in concern forreducing/eliminating the use of lead in brass and other copper alloys. Manymaterials are considered to replace lead in brass; silicon is one such alternative.The turned brass sample are investigated using the state of the artequipments at Halmstad University. The results obtained are controlled re

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Msheik, Khawla. "Fluides non newtoniens avec surface libre : modélisation et caractère bien posé." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALM050.

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Cette thèse porte sur la compréhension de systèmes dynamiques liés aux films liquides minces entraînés par la gravité; principalement des modèles d’eau peu profonde et des équations de lubrification. D’un point de vue modélisation, nous avons obtenu d’une part des modèles à 3 équations des eaux peu profondes pour les fluides newtoniens à viscosité constante décrivant l’évolution de la hauteur du fluide, de sa vitesse et d’une nouvelle variable définie équivalent eau taux de cisaillement. De tels modèles parviennent à capturer des régimes instables et à donner des résultats numériques satisfais

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Whitney, G. Adam. "Characterization of the Frictional-Shear Damage Properties of Scaffold-Free Engineered Cartilage and Reduction of Damage Susceptibility by Upregulation of Collagen Content." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1417470427.

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Freydier, Perrine. "Dynamique interne au front d'écoulements à surface libre. Application aux laves torrentielles." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAU010/document.

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Le modèle de couche mince intégré sur l'épaisseur, Saint-Venant, utilisé classiquement pour simuler la propagation de laves torrentielles et coulées boueuses, repose sur plusieurs approximations concernant la forme des profils de vitesse en zones non-uniformes. Il est pourtant nécessaire d'utiliser ce type de modélisation, comme outil d'aide à la gestion des risques liés aux laves torrentielles. Nous proposons d'éprouver ses hypothèses, en observant une zone fortement non-uniforme, le front de coulées à surface libre et le champ de vitesse à l'intérieur de cette zone.En améliorant notre connai

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Li, Jinxia. "Lubricating grease Experiments and modeling of wall-bounded- and free-surface flows." Doctoral thesis, Luleå tekniska universitet, Maskinelement, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26489.

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Lubricating grease is commonly applied to lubricate e.g. rolling bearings, sealsand gears. Grease has some clear advantages over lubricating oil: it is a semisolidmaterial, which prevents it from flowing/ leaking out from the bearingsystem and gives it sealing properties, and it also protects the system fromcontaminants and corrosion. Due to its consistency, lubricating grease has manyadditional advantages over lubricating oil: it does not require pumps, filters andsumps. However, the rheology of grease makes it more difficult to measure andstudy its flow dynamics. This study focuses on the in

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Livres sur le sujet "Lubrication free"

DellaCorte, Christopher. A systems approach to the solid lubrication of foil air bearings for oil-free turbomachinery. National Aeronautics and Space Administration, Glenn Research Center, 2002.

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E, Brewe David, United States. National Aeronautics and Space Administration., and United States. Army Aviation Research and Technology Activity., eds. A system-approach to the elastohydrodynamic lubrication point-contact problem. NASA, 1991.

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Chapitres de livres sur le sujet "Lubrication free"

Liu, Gao-Lian. "Dual Variational Principles for the Free-Boundary Problem of Cavitated Bearing Lubrication." In Advances in Mechanics and Mathematics. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-90-481-9577-0_10.

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Chau, O., D. Goeleven, and R. Oujja. "An Adaptive Finite Element Method for Solving a Free Boundary Problem with Periodic Boundary Conditions in Lubrication Theory." In Mathematical Analysis, Approximation Theory and Their Applications. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31281-1_5.

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"Surface Free Energy." In Encyclopedia of Lubricants and Lubrication. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-22647-2_100711.

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"Pore-Free Die Casting." In Encyclopedia of Lubricants and Lubrication. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-22647-2_200366.

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"Mineral Oil–Free Base Oils." In Encyclopedia of Lubricants and Lubrication. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-22647-2_100447.

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Fernandez-Diaz, Beatriz, Raquel Bayon, and Amaya Igartu. "Alternative Cr+6-Free Coatings Sliding Against NBR Elastomer." In Tribology - Lubricants and Lubrication. InTech, 2011. http://dx.doi.org/10.5772/21936.

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Tönshoff, H. K., H. G. Wobker, G. Brunner, and F. Kroos. "LIMITATIONS FOR LUBRICATION-FREE GRINDING OF HARDENED STEEL." In Advancement of Intelligent Production. Elsevier, 1994. http://dx.doi.org/10.1016/b978-0-444-81901-7.50098-0.

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"Experimental Research on Heat Transfer Performance in MQL Grinding With Different Nanofluids." In Enhanced Heat Transfer Mechanism of Nanofluid MQL Cooling Grinding. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1546-4.ch008.

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An investigation into the effect of nanofluid minimum quantity lubrication (MQL) on the temperatures in surface grinding is presented and discussed. Six types of nanoparticles, namely molybdenum disulfide (MoS2), zirconium dioxide (ZrO2), carbon nanotube (CNT), polycrystalline diamond, aluminum oxide (Al2O3), and silica dioxide (SiO2), are considered to mix individually with a pollution-free palm oil in preparing the nanofluids. A commonly used Ni-based alloy was chosen as the workpiece material. It is shown that CNT nanofluid results in the lowest grinding temperature of 110.7°C and the associated energy proportionality coefficient of 40.1%. The relevant physical properties of the nanofluids such as the coefficient of thermal conductivity, viscosity, surface tension, and the contact state between the droplets and workpiece surface (contact angle) were discussed to shine a light on their effect on the cooling performance. A mathematical model for convective heat transfer coefficient was then developed based on the boundary layer theories.

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Li, Changhe, and Hafiz Muhammad Ali. "Experimental Research on Heat Transfer Performance in MQL Grinding With Different Nanofluids." In Research Anthology on Synthesis, Characterization, and Applications of Nanomaterials. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8591-7.ch042.

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Zallen, Jeremy. "Dragged up Hither from the Bottom of the Sea." In American Lucifers. University of North Carolina Press, 2019. http://dx.doi.org/10.5149/northcarolina/9781469653327.003.0002.

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Beginning with the rise of the American whale fishery in the 1750s, this chapter explores the violent accumulation and circulation of energy embodied in whales. The lives and struggles of workers across the Atlantic world were caught up in the politics and processes of producing oil lights. Enslaved Africans forced into nightwork in West Indian sugar houses, the London poor confronting new state-sponsored street lamps, cotton mill laborers, and Pacific mariners were tangled together around common threads of American whale oils. American deep-sea whaling voyages first triggered a street lighting revolution that radiated from London to Europe and America, while a New England run trade in spermaceti candles, whale oil, slaves, and sugar helped illuminate and circulate the people and goods caught up in colonial transatlantic sugar slavery. Later, American whale oils lubricated an industrial revolution in cotton manufacturing, while fugitive slaves and free blacks carved out a geography of freedom in the globe-spanning Quaker-run fishery. As these entwined revolutions in night and cotton intensified in the antebellum period, they overwhelmed the capacity of the American fishery to meet the demand for both light and lubrication, even as ship masters drove whalemen on harder and longer voyages for less pay.

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Actes de conférences sur le sujet "Lubrication free"

Gottschlich, Joseph M., Robert P. Scaringe, and Fulin Gui. "Lubrication Free Centrifugal Compressor." In Aerospace Atlantic Conference & Exposition. SAE International, 1994. http://dx.doi.org/10.4271/941148.

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Martin, J. M., M. I. De Barros Bouchet, T. Le Mogne, and M. Kano. "Towards Superlubricity Under Boundary Lubrication." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63953.

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Fuel economy and reduction of harmless elements in lubricant are becoming crucial in the automotive industry. An approach to respond these requirements in engine components is the potential use of low friction coatings exposed to specific boundary lubrication conditions. Superlubricity is a new research field in tribology, dealing with very low friction values, typically below 0.01, and this even in dry or vacuum conditions. It is to be noticed that any friction coefficient below 0.001 is hardly measurable with the equipment at hand. Superlow friction was already experimentally observed only i

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Sakai, Masaaki. "Self Lubrication Type P/M Materials for the Lead Free Valve Seat." In SAE 2000 World Congress. SAE International, 2000. http://dx.doi.org/10.4271/2000-01-0395.

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Virsik, Roman, Frank Rinderknecht, and Horst E. Friedrich. "Free-Piston Linear Generator and the Development of a Solid Lubrication System." In ASME 2016 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icef2016-9362.

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The free piston linear generator is a new electromechanical generator. It converts chemical energy into electrical energy by means of a combustion process, a linear generator and a gas spring. Thereby the technology aims to have better properties than other electromechanical generators. Therefore this publication deals with the explanation of the concept, the characteristics of a free piston linear generator and one of the challenges in the development. In order to use a port scavenging the emission issue is the challenge and has to be solved. One possible solution is the use of solid lubrican

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Kurimoto, Satoru, Takahiro Niwa, Kenichi Kotani, and Kenji Sakai. "Development of Lead Free Copper Based Alloy for Bushing Under Boundary Lubrication." In SAE World Congress & Exhibition. SAE International, 2007. http://dx.doi.org/10.4271/2007-01-1569.

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Schmitz, Stefan, and Ru¨diger Lennartz. "Filtration of Lubrication Oil in Railway Applications." In ASME 2006 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ices2006-1442.

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Traditional designs, using cartridge filters for full-flow filtration, protect medium speed and high speed diesel engines from wear and keep the concentration of abrasive particles in the oil system down by collecting them out of the circulating oil flow. After several hundred running hours the filtration surface is saturated, the cartridges get exchanged and disposed. State of the art automatic filters protect the engines against wear with the same efficiency as the cartridge filters but the backflushing mechanism keeps the filtration surface clean and the lubrication circuit remains maintena

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Guo, Hong, Rui Liu, Alfonso Fuentes-Aznar, and Patricia Iglesias Victoria. "Friction and Wear Properties of Halogen-Free and Halogen-Containing Ionic Liquids Used As Neat Lubricants, Lubricant Additives and Thin Lubricant Layers." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67971.

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The lubricating ability of one halogen-free and one halogen-containing phosphonium-based ionic liquids are investigated as neat lubricants, lubricant additives and thin lubricant layers in steel-steel contact. The use of the ionic liquids in any of the three lubricating methods reduced friction and wear compared to a base mineral oil. The halogen-free ionic liquid outperformed the halogen-containing ionic liquid in the three methods of lubrication. The highest friction and wear reduction were obtained when ionic liquids were used as neat lubricants. Under this condition, friction reductions of

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Wornyoh, E. Y. A., and C. F. Higgs. "Self-Replenishing, Self-Repairing Solid Lubrication: Modelling and Experimentation." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63707.

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Several pellet-on disk and pad-on disk tribometer tests were conducted to study the lubrication characteristics of third-body particles of MoS2 powder. The tests consisted of simultaneous pellet-on disk and pad-on disk sliding contacts. Results from the tests show the self-repairing, self-replenishing, oil-free lubrication mechanism of MoS2. A theoretical control-volume fractional coverage model was developed to predict (1) the friction coefficient at the pad/disk interface and (2) the wear factor for the lubricated pellet/disk sliding contact. The fractional coverage varies with time and quan

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Yamamoto, G., T. Hashida, K. Adachi, Y. Sato, and K. Tohji. "Evaluation of Tribological Properties of Binder-Free Single-Walled Carbon Nanotube Solids for Solid Lubrication Applications." In WATER DYANMICS: 4th International Workshop on Water Dynamics. AIP, 2007. http://dx.doi.org/10.1063/1.2721263.

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Gorges, Roger, and Ronald Brock. "High-Performance Lead-Free Electroplated Composite Bearing Overlay for Heavy Duty Applications." In ASME 2013 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icef2013-19086.

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Material selection for engine internal components, e.g. bearings, is becoming increasingly more complex and demanding as the operating environments become more aggressive with the introduction of new technologies for the reduction of CO2 emissions. Historically, engine bearings contained lead, which has excellent fundamental bearing properties such as compatibility (run satisfactorily under conditions of marginal lubrication), conformability (deform and accept small scale geometrical inaccuracies of the crankshaft), and embeddablity (tolerance to dirt and other foreign materials) whilst being

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Rapports d'organisations sur le sujet "Lubrication free"

Gottschlich, Joseph M., Robert P. Scaringe, and Fulin Gui. Lubrication Free Centrifugal Compressor. Defense Technical Information Center, 1994. http://dx.doi.org/10.21236/ada351103.

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