Relevant bibliographies by topics / Lubricant pathway

Academic literature on the topic 'Lubricant pathway'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Lubricant pathway"

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Xie, Mengxin, Bingli Pan, Ning Li, Shuang Zhao, Junjiang Yan, Shihao Guo, Zhe Chen, and Honggang Wang. "2D graphene/FeOCl heterojunctions with enhanced tribology performance as a lubricant additive for liquid paraffin." RSC Advances 12, no. 5 (2022): 2759–69. http://dx.doi.org/10.1039/d1ra06650a.

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Graphene/FeOCl (G/FeOCl) heterojunctions were prepared by microwave-pyrolysis, thoroughly characterised and used to probe the synergistic lubrication of G with FeOCl in liquid paraffin. We provide a pathway for low-friction lubricants by deploying G/FeOCl 2D materials.
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La, Duong Duc, Tuan Ngoc Truong, Thuan Q. Pham, Hoang Tung Vo, Nam The Tran, Tuan Anh Nguyen, Ashok Kumar Nadda, et al. "Scalable Fabrication of Modified Graphene Nanoplatelets as an Effective Additive for Engine Lubricant Oil." Nanomaterials 10, no. 5 (May 1, 2020): 877. http://dx.doi.org/10.3390/nano10050877.

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The use of nano-additives is widely recognized as a cheap and effective pathway to improve the performance of lubrication by minimizing the energy loss from friction and wear, especially in diesel engines. In this work, a simple and scalable protocol was proposed to fabricate a graphene additive to improve the engine lubricant oil. Graphene nanoplates (GNPs) were obtained by a one-step chemical exfoliation of natural graphite and were successfully modified with a surfactant and an organic compound to obtain a modified GNP additive, that can be facilely dispersed in lubricant oil. The GNPs and modified GNP additive were characterized using scanning electron microscopy, X-ray diffraction, atomic force microscopy, Raman spectroscopy, and Fourier-transform infrared spectroscopy. The prepared GNPs had wrinkled and crumpled structures with a diameter of 10–30 µm and a thickness of less than 15 nm. After modification, the GNP surfaces were uniformly covered with the organic compound. The addition of the modified GNP additive to the engine lubricant oil significantly enhanced the friction and antiwear performance. The highest reduction of 35% was determined for the wear scar diameter with a GNP additive concentration of approximately 0.05%. The mechanism for lubrication enhancement by graphene additives was also briefly discussed.
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Gulzar, M., H. H. Masjuki, M. A. Kalam, M. Varman, and I. M. Rizwanul Fattah. "Oil filter modification for biodiesel–fueled engine: A pathway to lubricant sustainability and exhaust emissions reduction." Energy Conversion and Management 91 (February 2015): 168–75. http://dx.doi.org/10.1016/j.enconman.2014.11.055.

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Liu, X., F. Zhou, Y. Liang, and W. Liu. "Benzotriazole as the additive for ionic liquid lubricant: one pathway towards actual application of ionic liquids." Tribology Letters 23, no. 3 (September 2, 2006): 191–96. http://dx.doi.org/10.1007/s11249-006-9050-7.

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Maglinao, Randy L., Eleazer P. Resurreccion, Sandeep Kumar, Amado L. Maglinao, Sergio Capareda, and Bryan R. Moser. "Hydrodeoxygenation–Alkylation Pathway for the Synthesis of a Sustainable Lubricant Improver from Plant Oils and Lignin-Derived Phenols." Industrial & Engineering Chemistry Research 58, no. 10 (January 22, 2019): 4317–30. http://dx.doi.org/10.1021/acs.iecr.8b05188.

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Ielchici, Christian Dejan, Stefan Krenn, and Stefan J. Eder. "A tribometer and methodology for wear and friction testing of porous journal bearings at elevated temperatures." Industrial Lubrication and Tribology 72, no. 8 (April 13, 2020): 1027–31. http://dx.doi.org/10.1108/ilt-08-2019-0351.

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Purpose This paper aims on a methodology to overcome the fact that conventional service life testing of porous journal bearings (PJBs) requires long test times and is not economical. Design/methodology/approach This paper sketches out a pathway to strongly accelerated life tests for PJBs enabled by high load and elevated temperature, which saves months or even years of testing. The testing time is not only reduced to a few weeks, but the results are also statistically secured via a multiple test rig construction of a custom-made tribometer. Findings An exemplary bearing-lubricant combination is tested in the mixed lubrication regime, where the coefficient of friction is monitored during the test. Originality/value A Weibull curve is fitted to the experimental results to show the survival probability of the combination over time. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2019-0351/
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Balakrishnan, Madhesan, Eric R. Sacia, Sanil Sreekumar, Gorkem Gunbas, Amit A. Gokhale, Corinne D. Scown, F. Dean Toste, and Alexis T. Bell. "Novel pathways for fuels and lubricants from biomass optimized using life-cycle greenhouse gas assessment." Proceedings of the National Academy of Sciences 112, no. 25 (June 8, 2015): 7645–49. http://dx.doi.org/10.1073/pnas.1508274112.

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Decarbonizing the transportation sector is critical to achieving global climate change mitigation. Although biofuels will play an important role in conventional gasoline and diesel applications, bioderived solutions are particularly important in jet fuels and lubricants, for which no other viable renewable alternatives exist. Producing compounds for jet fuel and lubricant base oil applications often requires upgrading fermentation products, such as alcohols and ketones, to reach the appropriate molecular-weight range. Ketones possess both electrophilic and nucleophilic functionality, which allows them to be used as building blocks similar to alkenes and aromatics in a petroleum refining complex. Here, we develop a method for selectively upgrading biomass-derived alkyl methyl ketones with >95% yields into trimer condensates, which can then be hydrodeoxygenated in near-quantitative yields to give a new class of cycloalkane compounds. The basic chemistry developed here can be tailored for aviation fuels as well as lubricants by changing the production strategy. We also demonstrate that a sugarcane biorefinery could use natural synergies between various routes to produce a mixture of lubricant base oils and jet fuels that achieve net life-cycle greenhouse gas savings of up to 80%.
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Jhon, Myung S., Pil Seung Chung, Robert L. Smith, and Lorenz T. Biegler. "A Description of Multiscale Modeling for the Head-Disk Interface Focusing on Bottom-Level Lubricant and Carbon Overcoat Models." Advances in Tribology 2013 (2013): 1–27. http://dx.doi.org/10.1155/2013/794151.

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The challenges in designing future head disk interface (HDI) demand efficient theoretical modeling tools with flexibility in investigating various combinations of perfluoropolyether (PFPE) and carbon overcoat (COC) materials. For broad range of time and length scales, we developed multiscale/multiphysical modeling approach, which can bring paradigm-shifting improvements in advanced HDI design. In this paper, we introduce our multiscale modeling methodology with an effective strategic framework for the HDI system. Our multiscale methodology in this paper adopts a bottom to top approach beginning with the high-resolution modeling, which describes the intramolecular/intermolecular PFPE-COC degrees of freedom governing the functional oligomeric molecular conformations on the carbon surfaces. By introducing methodology for integrating atomistic/molecular/mesoscale levels via coarse-graining procedures, we investigated static and dynamic properties of PFPE-COC combinations with various molecular architectures. By bridging the atomistic and molecular scales, we are able to systematically incorporate first-principle physics into molecular models, thereby demonstrating a pathway for designing materials based on molecular architecture. We also discussed future materials (e.g., graphene for COC, star-like PFPEs) and systems (e.g., heat-assisted magnetic recording (HAMR)) with higher scale modeling methodology, which enables the incorporation of molecular/mesoscale information into the continuum scale models.
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Hamdi, N. A., S. Sha’arani, N. F. Azman, S. B. Mohd Rafi, E. Norsin, and N. Othman. "Management of Waste Cooking Oil and its Potential for Value-added Materials: A Mini Review." IOP Conference Series: Earth and Environmental Science 1091, no. 1 (November 1, 2022): 012054. http://dx.doi.org/10.1088/1755-1315/1091/1/012054.

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Improper management of waste cooking oil in food industries like restaurants, hotels, and the use of retort technology in food processing is causing a devastating impact towards the environment. This is observed through odor problems and oil film formation on the surface of water bodies that increases the biological oxygen demand. Additionally, different types of cooking oil represent different physicochemical properties. This allows for the potential use of waste cooking oil as a carbon source for fungal growth thus contributing to the production of value-added products at a low cost and eco-friendly process. Biodegradation may take place by the enzymatic reaction which involves the hydrolysis of triglycerides and metabolized through the β-oxidation pathway to acetyl-CoA. Many fungal and bacterial strains capable of degrading vegetable cooking oils have been reported with most from the genus Aspergillus, Pseudomonas, Enterobacter, and others. From the industrial perspective, with the correct technology and proper recycling technique, waste cooking oil can be readily utilized as chemical building blocks in lubricant, candle, and fuel productions.
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Liu, Tongfang, Song Rui, and Sheng Li. "Layer-by-Layer Self-Assembly Composite Coatings for Improved Corrosion and Wear Resistance of Mg Alloy for Biomedical Applications." Coatings 11, no. 5 (April 27, 2021): 515. http://dx.doi.org/10.3390/coatings11050515.

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Mg alloys are promising biomedical metal due to their natural degradability, good processability, and favorable mechanical properties. However, the poor corrosion resistance limits their further clinical applications. In this study, the combined strategies of surface chemical treatment and layer-by-layer self-assembly were used to prepare composite coatings on Mg alloys to improve the biocorrosion resistance. Specially, alkalized AZ91 Mg alloy generated chemical linkage with silane via Si–O–Mg covalent bond at the interface. Subsequently, Si–OH group from silane formed a crosslinked silane layer by Si–O–Si network. Further chemical assembly with graphene oxide (GO), lengthened the diffusion pathway of corrosive medium. The chemically assembled composite coatings could firmly bond to Mg alloy substrate, which persistently and effectively acted as compact barriers against corrosion propagation. Improved biocorrosion resistance of AZ91 Mg alloy with self-assembly composite coatings of silane/GO was subsequently confirmed by immersion tests. Besides, the Mg alloy exhibited good wear resistance due to outside layer of GO with a lubricant effect. Cell viability of higher than 75% had also been found for the alloy with self-assembly composite coatings, which showed good cytocompatibility.
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Book chapters on the topic "Lubricant pathway"

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Schomburg, K. Cory, and David Wooton. "Root Cause Studies to Investigate Phosphate Varnish Formation by Thermal Degradation Pathways." In Standard Guides and Practices that Support the Lubricant Condition Monitoring Industry, 209–39. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2022. http://dx.doi.org/10.1520/stp163420210022.

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Conference papers on the topic "Lubricant pathway"

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Weaver, Brian K., Gen Fu, Andres F. Clarens, and Alexandrina Untaroiu. "Performance Analysis of Gas-Expanded Lubricants in a Hybrid Bearing Using Computational Fluid Dynamics." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53735.

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Gas-expanded lubricants (GELs), tunable mixtures of synthetic oil and dissolved carbon dioxide, have been previously shown to potentially increase bearing efficiency, rotordynamic control, and long-term reliability in flooded journal bearings by controlling the properties of the lubricant in real time. Previous experimental work has established the properties of these mixtures and multiple numerical studies have predicted that GELs stand to increase the performance of flooded bearings by reducing bearing power losses and operating temperatures while also providing control over bearing stiffness and damping properties. However, to date all previous analytical studies have utilized Reynolds equation-based approaches while assuming a single-phase mixture under high-ambient pressure conditions. The potential implications of multi-phase behavior could be significant to bearing performance, therefore a more detailed study of alternative operating conditions that may include multi-phase behavior is necessary to better understanding the full potential of GELs and their effects on bearing performance. In this work, the performance of GELs in a fixed geometry journal bearing were evaluated to examine the effects of these lubricants on the fluid and bearing dynamics of the system under varying operating conditions. The bearing considered for this study was a hybrid hydrodynamic-hydrostatic bearing to allow for the study of various lubricant supply and operating conditions. A computational fluid dynamics (CFD)-based approach allowed for a detailed evaluation of the lubricant injection pathway, the flow of fluid throughout the bearing geometry, thermal behavior, and the collection of the lubricant as it exits the bearing. This also allowed for the study of the effects of the lubricant behavior on overall bearing performance.
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DesJardins, John, Lisa Gustafson, Lisa Benson, and Martine LaBerge. "Fiberscopic Visualization of Total Knee Replacement Contact Kinematics During In Vitro Simulation." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63699.

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Optimization of total knee replacement (TKR) design and wear behavior requires the study of bearing contact mechanics. In this study, a novel fiberscopic imaging method was developed and combined with dynamic TKR simulation to visually quantify dynamic TKR contact areas in vitro. Contact areas between transparent TKR tibial inserts and metallic femoral components were captured using opaque lubricant media and a fiberscopic high-speed video camera within the simulator. Walking and stair descent loading patterns were characterized. Centroid location and contact pathways were calculated to determine pathway velocity and cross-shear characteristics. Overall, contact velocities ranging from 0 to 233mm/sec and crossing angles ranging from near 0 to 90 degrees were found during this study. These results provide a basis for wear testing and cross-shear modeling of TKR materials, leading to more accurate predictions of wear behavior in these implants.
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Street, Kenneth W., and Marjorie F. Sovinski. "Analysis of Black Bearing Balls From a Space Shuttle Body Flap Actuator." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63539.

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A significantly deteriorated ball bearing mechanism from a body flap actuator on Space Shuttle OV-103 was disassembled and the balls submitted for analysis in conjunction with Return to Flight activities. The OV-103 balls, referred to as the “black balls”, were subjected to X-ray photoelectron spectroscopy (XPS), Fourier Transform Infrared (FT-IR) and Raman micro spectroscopy, surface profilometry, and optical and electron microscopy. The spectroscopic results in combination with microscopy analysis allowed a determination of the lubricant degradation pathway. The chemical attack mechanism does not adequately explain the unique visual appearance of the black balls. Numerous efforts have unsuccessfully focused on duplication of the phenomena causing this unique surface structure and appearance of the black balls. Further detail will be presented supporting these conclusions along with plausible explanations of the unique black appearance to the balls.
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Tani, Hiroshi, Yuta Shibahara, Renguo Lu, Shinji Koganezawa, and Norio Tagawa. "TOF-SIMS Analysis of Accumulated PFPE Lubricant Smear Following Laser Heating." In ASME-JSME 2018 Joint International Conference on Information Storage and Processing Systems and Micromechatronics for Information and Precision Equipment. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/isps-mipe2018-8515.

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The structural and molecular weight changes to lubricant picked up following laser heating in heat-assisted magnetic recording (HAMR) were analyzed using time-of-flight secondary ion mass spectrometry (TOF-SIMS). The intensity of the ion mass fragments depended on the decomposition pathways and changed drastically, as did the average molecular weight of the picked-up lubricant as heating temperature increased. The fragment series formed by the dissociation of end groups with low molecular weights (CH3O+) showed a high intensity at temperatures under 300 °C, whereas at temperatures over 400 °C, the fragments series formed by the dissociation of the end-group component (C5H9O4F2+) increased. Overall, the results presented herein suggest that the chemical and thermal stability of the hydrocarbon terminal ends of lubricants should be improved in order to decrease depletion of the lubricant film and lubricant pickup by laser heating in HAMR.
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Pfaendtner, Jim, Linda J. Broadbelt, and Q. Jane Wang. "Strategies for Constructing Reaction Networks of Lubricant Degradation." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64008.

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Automated mechanism generation is an essential tool to be able to create mechanistic models of lubricant degradation chemistry. To date, modeling of lubricant degradation has been accomplished only through the use of lumped or pathways-style approaches. These methods have yielded important insights into major degradation pathways but lack predictive power and fail to produce some key trends in the product distribution, even qualitatively. Mechanistic models of lubricant degradation include reactivity of individual species as well as the role of secondary reactions. Such models have much to offer in terms of fundamental understanding of degradation chemistry. Furthermore, they may be exploited to directly study the effect of radical stabilizers and additives. Key results obtained include a quantitative description of the degradation of a model lubricant as well as detailed kinetic correlations for estimating rate constants. This poster presents our efforts to construct detailed reaction mechanisms of lubricant degradation. The underlying theories of automated network generation and preliminary results are presented.
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Morales, Wilfredo, Kenneth W. Street, Victor R. Koch, and Ryan M. Richard. "Evaluation of Vapor Pressure and Ultra-High Vacuum Tribological Properties of Ionic Liquids (2) Mixtures and Additives." In STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71044.

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Ionic liquids are salts, many of which are typically viscous fluids at room temperature. The fluids are characterized by negligible vapor pressures under ambient conditions. These properties have led us to study the effectiveness of ionic liquids containing both organic cations and anions for use as space lubricants. In the previous paper we have measured the vapor pressure and some tribological properties of two distinct ionic liquids under simulated space conditions. In this paper we will present vapor pressure measurements for two new ionic liquids and friction coefficient data for boundary lubrication conditions in a spiral orbit tribometer using stainless steel tribocouples. In addition we present the first tribological data on mixed ionic liquids and an ionic liquid additive. Post mortem infrared and Raman analysis of the balls and races indicates the major degradation pathway for these two organic ionic liquids is similar to those of other carbon based lubricants, i.e. deterioration of the organic structure into amorphous graphitic carbon. The coefficients of friction and lifetimes of these lubricants are comparable to or exceed these properties for several commonly used space oils.
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