Friction and Wear Performance of Low-friction Carbon Coatings Under Oil Lubrication PDF Download
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Languages : en
Pages : 12
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Book Description
Amorphous carbon coatings with very low friction properties were recently developed at Argonne National Laboratory. These coatings have shown good promise in mitigating excessive wear and scuffing problems associated with low-lubricity diesel fuels. To reduce the negative effect of sulfur and other lubricant additives in poisoning the after-treatment catalyst, a lubricant formulation with a low level of sulfur may be needed. Exclusion of proven sulfur-containing extreme pressure (EP) and antiwear additives from oils will require other measures to ensure durability of critical lubricated components. The low-friction carbon coating has the potential for such applications. In the present study, we evaluated the friction and wear attributes of three variations of the coating under a boundary lubrication regime. Tests were conducted with both synthetic and mineral oil lubricants using a ball-on-flat contact configuration in reciprocating sliding. Although the three variations of the coating provided modest reductions in friction coefficient, they all reduced wear substantially compared to an uncoated surface. The degradation mode of oxidative wear on the uncoated surface was replaced by a polishing wear mode on the coated surfaces.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Book Description
Amorphous carbon coatings with very low friction properties were recently developed at Argonne National Laboratory. These coatings have shown good promise in mitigating excessive wear and scuffing problems associated with low-lubricity diesel fuels. To reduce the negative effect of sulfur and other lubricant additives in poisoning the after-treatment catalyst, a lubricant formulation with a low level of sulfur may be needed. Exclusion of proven sulfur-containing extreme pressure (EP) and antiwear additives from oils will require other measures to ensure durability of critical lubricated components. The low-friction carbon coating has the potential for such applications. In the present study, we evaluated the friction and wear attributes of three variations of the coating under a boundary lubrication regime. Tests were conducted with both synthetic and mineral oil lubricants using a ball-on-flat contact configuration in reciprocating sliding. Although the three variations of the coating provided modest reductions in friction coefficient, they all reduced wear substantially compared to an uncoated surface. The degradation mode of oxidative wear on the uncoated surface was replaced by a polishing wear mode on the coated surfaces.
Author: Simon Donald A. J. Lawes
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The UK produces>150 million tonnes of CO2 annually, a large proportion of which comes from the transport sector. The UK looks to lead the way in CO2 emission reduction, committing to an 80% reduction by 2050. Meeting this target is going to be a huge challenge for engineers in all sectors of industry, and improved component efficiency will have a large role to play. This study has looked at the three novel friction and wear reduction techniques that may find application in the valve-train component of the automotive internal combustion engine. The aim of this study has been to establish the effectiveness of a range of: i) diamond-like carbon (DLC) coatings; ii) carbon nitride (CNx) coatings, and; iii) ionic liquid based lubricants, at reducing friction and wear in the valve-train. The main focus of this work has been the study of thin, wear resistant, and lubricious DLC coatings. A range of DLC coatings have been investigated to determine their performance in an instrumented valve-train test rig and compared to coating mechanical properties. Similar work has been conducted with CNx coatings, which are also thin, wear resistant and lubricious, whilst maintaining a lower hardness to elastic modulus ratio. It has been confirmed in this work that coating adhesion, hardness and abrasion resistance are key to coating durability in the valve-train along with the novel observation that impact toughness, particularly resistance to high angle inclined impact, is a very important factor in determining coating lifetimes. Also work has also been done to investigate the lubrication properties of ionic liquids. These liquids have very different chemistry to traditional hydrocarbon based lubricants but have demonstrated values of friction coefficient similar to that of engine oil. The mechanism by which these liquids are retained in the contact and provide lubrication bears further investigation.
Author:
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Category :
Languages : en
Pages : 12
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Book Description
Author: Kenneth Holmberg
Publisher: Elsevier
ISBN: 0080931464
Category : Technology & Engineering
Languages : en
Pages : 577
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Book Description
The surface coating field is a rapidly developing area of science and technology that offers new methods and techniques to control friction and wear. New coating types are continually being developed and the potential applications in different industrial fields are ever growing, ranging from machine components and consumer products to medical instruments and prostheses. This book provides an extensive review of the latest technology in the field, addressing techniques such as physical and chemical vapour deposition, the tribological properties of coatings, and coating characterization and performance evaluation techniques. Eleven different cases are examined in close detail to demonstrate the improvement of tribological properties and a guide to selecting coatings is also provided. This second edition is still the only monograph in the field to give a holistic view of the subject and presents all aspects, including test and performance data as well as insights into mechanisms and interactions, thus providing the level of understanding vital for the practical application of coatings. * An extensive review of the latest developments in the field of surface coatings * Presents both theory and practical applications * Includes a guide for selecting coatings
Author: Gwidon W. Stachowiak
Publisher: John Wiley & Sons
ISBN: 0470017015
Category : Technology & Engineering
Languages : en
Pages : 478
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Book Description
Tribology is emerging from the realm of steam engines and crank-case lubricants and becoming key to vital new technologies such as nanotechnology and MEMS. Wear is an integral part of tribology, and an effective understanding and appreciation of wear is essential in order to achieve the reliable and efficient operation of almost any machine or device. Knowledge in the field has increased considerably over recent years, and continues to expand: this book is intended to stimulate its readers to contribute towards the progress of this fascinating subject that relates to most of the known disciplines in physical science. Wear – Materials, Mechanisms and Practice provides the reader with a unique insight into our current understanding of wear, based on the contributions of numerous internationally acclaimed specialists in the field. Offers a comprehensive review of current knowledge in the field of wear. Discusses latest topics in wear mechanism classification. Includes coverage of a wide variety of materials such as metals, polymers, polymer composites, diamonds, and diamond-like films and ceramics. Discusses the chemo-mechanical linkages that control tribology, providing a more complete treatment of the subject than just the conventional mechanical treatments. Illustrated throughout with carefully compiled diagrams that provide a unique insight into the controlling mechanisms of tribology. The state of the art research on wear and the mechanisms of wear featured will be of interest to post-graduate students and lecturers in engineering, materials science and chemistry. The practical applications discussed will appeal to practitioners across virtually all sectors of engineering and industry including electronic, mechanical and electrical, quality and reliability and design.
Author: Robert W. Bruce
Publisher: CRC Press
ISBN: 142006908X
Category : Technology & Engineering
Languages : en
Pages : 1173
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Book Description
Since the publication of the best-selling first edition, the growing price and environmental cost of energy have increased the significance of tribology. Handbook of Lubrication and Tribology, Volume II: Theory and Design, Second Edition demonstrates how the principles of tribology can address cost savings, energy conservation, and environmental protection. This second edition provides a thorough treatment of established knowledge and practices, along with detailed references for further study. Written by the foremost experts in the field, the book is divided into four sections. The first reviews the basic principles of tribology, wear mechanisms, and modes of lubrication. The second section covers the full range of lubricants/coolants, including mineral oil, synthetic fluids, and water-based fluids. In the third section, the contributors describe many wear- and friction-reducing materials and treatments, which are currently the fastest growing areas of tribology, with announcements of new coatings, better performance, and new vendors being made every month. The final section presents components, equipment, and designs commonly found in tribological systems. It also examines specific industrial areas and their processes. Sponsored by the Society of Tribologists and Lubrication Engineers, this handbook incorporates up-to-date, peer-reviewed information for tackling tribological problems and improving lubricants and tribological systems. The book shows how the proper use of generally accepted tribological practices can save money, conserve energy, and protect the environment.
Author: Peter J. Blau
Publisher: Elsevier
ISBN: 9780080447360
Category : Technology & Engineering
Languages : en
Pages : 826
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Book Description
These proceedings of the 15th International Conference on Wear of Materials focus on the friction and wear of materials in various applications under different environments from the nanometer scale to the meter scale. The conference provides a unique international forum for researchers and practitioners from different disciplines to exchange latest results. Coverage includes: . Wear assessment and monitoring . Wear modeling, mechanisms, mapping and prediction . Wear-corrosion testing and control . Surface engineering for wear and wear-corrosion control . Development of new wear test methods and wear test methodologies . Wear of materials for biomedical applications . Wear of non-equilibrium materials: from atomic dimensions to the micro-scale . Wear of hard and superhard materials . Wear of materials in the earthmoving, minerals processing and mining industries
Author: Peerawatt Nunthavarawong
Publisher: CRC Press
ISBN: 1000630137
Category : Technology & Engineering
Languages : en
Pages : 329
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Book Description
Diamond-like carbons (DLCs) display a number of attractive properties that make them versatile coating materials for a variety of applications, including extremely high hardness values, very low friction properties, very low gas permeability, good biocompatibility, and very high electrical resistivity, among others. Further research into this material is required to produce hydrogen-free DLC films and to synthesize it together with other materials, thereby obtaining better film properties. Diamond-Like Carbon Coatings: Technologies and Applications examines emerging manufacturing technologies for DLCs with the aim of improving their properties for use in practical applications. Discusses DLC coatings used in mechanical, manufacturing, and medical applications Details recent developments in the novel synthesis of DLC films Covers advances in understanding of chemical, structural, physical, mechanical, and tribological properties for modern material processing Highlights methods to yield longer service life Considers prospects for future applications of emerging DLC technologies This work is aimed at materials science and engineering researchers, advanced students, and industry professionals.
Author: Mohd Fadzli Bin Abdollah
Publisher: Malaysian Tribology Society
ISBN: 9671362524
Category :
Languages : en
Pages : 540
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Book Description
This ebook is a compilation of 234 papers presented at the 6th Asia International Conference on Tribology (ASIATRIB2018): Kuching, Sarawak - Malaysia from 17 to 20 September 2018.
Author: Christophe Donnet
Publisher: Springer Science & Business Media
ISBN: 0387498915
Category : Technology & Engineering
Languages : en
Pages : 673
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Book Description
This book highlights some of the most important structural, chemical, mechanical and tribological characteristics of DLC films. It is particularly dedicated to the fundamental tribological issues that impact the performance and durability of these coatings. The book provides reliable and up-to-date information on available industrial DLC coatings and includes clear definitions and descriptions of various DLC films and their properties.
