The Effects of Surface Modification on Properties of Solid Lubricant Additives PDF Download
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Author: Yang Jiao
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Yang Jiao
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Chuanli Zhao
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The present work investigates the tribological properties of solid particles as lubricant additives in lubricants. Two types of solid particles, Ceria nanoparticles (CeO2) and Zinc borate ultrafine powders (ZB UFPs), were used as the lubricant additives in this study. The friction and wear behaviours of these lubricant additives in different base lubricants were identified. With an appropriate application of these solid lubricant additives, the friction reduction and wear resistance properties of the lubricant have been successfully improved. Without assistance of surfactant or surface modification, the two types of solid particles behave very differently. Evident performance was observed that pure ZB UFPs were capable of considerably reducing the friction coefficient of sunflower oil and liquid paraffin when they were used as a lubricant additive without further treatment. On the contrary, CeO2 nanoparticles did not show noticeable contribution to friction reduction when they were used as the only additive in water. Only when surfactant Sorbitan monostearate was employed to enhance the dispersibility of CeO2 nanoparticles in water, the application of this additive was capable of reducing friction coefficient of the water based lubricant effectively. Surface modification of the solid particles was carried out to improve the dispersibility of these particles in base lubricants. Oleic acid (OA) and Hexadecyltrimethoxysilane (HDTMOS) were selected as the modification agents. Modified CeO2 nanoparticles and ZB UFPs revealed outstanding wear resistance property. An improvement of up to 15 times was identified although this improvement on wear resistance, in this case, was often companied by a rise in friction coefficient. Tribo-films generated by tribo-chemical reaction were observed on most of the worn surfaces and the formation of this tribo-film appeared to have played an important role in the friction and wear behaviours of a system. A tenacious tribo-film with good surface coverage was only generated on the worn surface when HDTMOS modified solid particles were used as lubricant additives. The mechanical properties and elemental composition of the tribo-film were studied with nano-indentation and energy-dispersive X-ray spectroscopy (EDS). Finally, based on the experimental evidence, different functionalities of CeO2 nanoparticles and ZB UFPs as solid lubricant additives were recognized.
Author: Ranjan Kumar Mohapatra
Publisher: Bentham Science Publishers
ISBN: 9815036823
Category : Technology & Engineering
Languages : en
Pages : 250
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Book Description
Chemical Modification of Solid Surfaces by the Use of Additives brings ten comprehensive chapters covering different types of solid surface modifications by using surfactants or other chemicals. Each chapter explains different types of chemical surface modifications that are important for a large variety of applications. The uses of each type of modification is summarized to give the reader an overview of recent developments in this field of materials science. The book also highlights the importance of surface modification for the biomedical application of polysaccharides, sensing application of carbon electrode, metal coating substrate surfaces, microelectronic, microwave applications of perovskite material and the role of nanotechnology. This book is a useful reference for chemical engineering and civil engineering students who wish to understand the surface chemistry of additive materials. Scholars undertaking courses in nanotechnology and environmental science will also benefit from the information presented by the book.
Author: Leslie R. Rudnick
Publisher: CRC Press
ISBN: 0824747402
Category : Science
Languages : en
Pages : 766
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Book Description
This text details the design of cost-effective, environmentally friendly lubricant additive technologies and components for the automotive, industrial, manufacturing, food, and aerospace industries. Presenting methods to improve the performance and stability of lubricants, protect metal surfaces against wear, and to control deposits and contaminant
Author: Eric Reeves Braithwaite
Publisher:
ISBN:
Category : Lubrication and lubricants
Languages : en
Pages : 310
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Book Description
Author: George Wypych
Publisher: Elsevier
ISBN: 1774670151
Category : Technology & Engineering
Languages : en
Pages : 857
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Book Description
Databook of Surface Modification Additives, Second Edition contains data on 10 groups of additives, including anti-scratch and mar-preventing additives, additives for surface tension reduction and wetting, hydrophobization additives, gloss enhancement and surface matting additives, additives for formation of tack-free surface and tackifiers, and stain inhibiting additives. The information on each is divided into five sections, including General Information, Physical- chemical Properties, Health and Safety, Ecological Properties and Use and Performance. This data is provided for approximately 360 of the most important surface modification additives produced and used today. This databook will be an extremely useful resource for engineers, researchers and technicians interested in using additives to modify and improve the surface properties of materials. Provides detailed, up-to-date, essential data on 10 groups of additives Covers general information, physical-chemical properties, health and safety, ecological properties, and use and performance Includes recommendations for specific products, applications, processing methods and the concentrations used
Author: George E. Totten
Publisher: CRC Press
ISBN: 9780203021545
Category : Science
Languages : en
Pages : 776
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Book Description
Navigating through an extensive compilation of surface modification reactions and processes for specific tribological results, this reference compiles detailed studies, many not found in other texts, on various residual stresses, reaction processes and mechanisms, heat treatment methods, plasma-based techniques, laser impingement, nanometer scale surface modification, and more. Surface Modification and Mechanisms: Friction, Stress, and Reaction Engineering offers guidelines for the consideration and design of wear and frictional performance and provides a unique understanding of surface structural changes that occur during various engineering procedures.
Author: George Wypych
Publisher: Elsevier
ISBN: 1774670259
Category : Technology & Engineering
Languages : en
Pages : 263
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Book Description
Handbook of Surface Improvement and Modification, Second Edition covers additives and the modification processes that determine the surface properties of many materials. These additives can modify or improve scratch and mar resistance, improve gloss or flatten the surface, increase or decrease tack and inhibit staining. Mechanisms of damage, protection and property improvements are also discussed, making this an essential handbook for engineers, researchers and technicians interested in using additives to modify and improve the surface properties of materials. A companion book, Databook of Surface Modification and Additives, is also available with more information on the additives commercially available to improve materials. Focuses on the improvement of surface properties, with detailed coverage of the additives used, including the process of selection and examples of application Presents the mechanisms of damage, protection and property improvements based on research data Aids the user in formulating products that fit specific requirements and applications
Author: Phillip Warren Centers
Publisher:
ISBN:
Category : Friction
Languages : en
Pages : 452
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Book Description
Oxide and sulfide additions to molybdenum disulfide and graphite solid lubricants were evaluated experimentally. Results indicate that the tribologically beneficial effect of bulk additions to solid lubricants originates in the ability of the additive to deform under asperity contact conditions to permit the solid lubricant to attain and retain preferred tribological orientation for overall improvement in tribological condition. Such improvement is evident in scanning electron microscopic examination of worn compact surfaces. Thermal mechanical analyses of solid lubricant compacts and calculated asperity flash temperatures indicate that the mechanism proposed is plausible. Studies of antimony trioxide as an additive to molybdenum disulfide support the hypothesis. Previous hypothesis offered to explain the beneficial effect of Sb2O3, retardation of Mos2 oxidation by Sb2O3, or formation of a eutectic of antimony and molybdenum oxides to improve transfer film formation are refuted. In summary, lubricant compact properties and selection of bulk additions for improved tribological performance are hypothesized to be determined by the test or application conditions, the shear strength at asperity contact temperature of the additive and properties of the solid lubricant. Keywords: Solid Lubricant Additives.
Author: S.P. Srivastava
Publisher: CRC Press
ISBN:
Category : Medical
Languages : en
Pages : 480
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Book Description
It is understood that hydrogen is going to be the future clean fuel, which can either be used in fuel cells or directly in engines. This will mean that there will be challenges to the lubricant developers to meet the requirements of new engines using hydrogen as fuel, where there would be no soot, no sulphur, and no carbon deposits from fuels. Lubricating base oil technology has changed during the last decade. API group III oils produced through hydro processes and GTL base oils are free from sulphur and nitrogen and have high viscosity index. Therefore the engine oil formulations would have to change considerably in the near future. The use of biodegradable lubricants mainly based on vegetable oils or genetically modified vegetable oils, would increase in the agricultural and forest sector. This book incorporates up-to-date information on these important subjects, which shall enable the readers to understand the dynamics of lubricant additive technology and tribology. The book will be useful to all those engaged in education and research in the field of lubricant additives and lubricants.
