Download or read book Friction and Wear Performance of Diamondlike Carbon Films Grown in Various Source Gas Plasmas written by and published by . This book was released on 2000 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, the authors investigated the effects of various source gases (methane, ethane, ethylene, and acetylene) on the friction and wear performance of diamondlike carbon (DLC) films prepared in a plasma enhanced chemical vapor deposition (PECVD) system. Films were deposited on AISI H13 steel substrates and tested in a pin-on-disk machine against DLC-coated M50 balls in dry nitrogen. They found a close correlation between friction coefficient and source gas composition. Specifically, films grown in source gases with higher hydrogen-to-carbon ratios exhibited lower friction coefficients and higher wear resistance than films grown in source gases with lower hydrogen-to-carbon (H/C) ratios. The lowest friction coefficient (0.014) was achieved with a film derived from methane with an WC ratio of 4, whereas the coefficient of films derived from acetylene (H/C = 1) was of 0.15. Similar correlations were observed for wear rates. Specifically, films derived from gases with lower H/C values were worn out and the substrate material was exposed, whereas films from methane and ethane remained intact and wore at rates that were nearly two orders of magnitude lower than films obtained from acetylene.
Download or read book Synthesis of Diamondlike Carbon Films with Superlow Friction and Wear Properties written by and published by . This book was released on 2000 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, the authors introduce a new diamondlike carbon (DLC) film providing a friction coefficient of 0.001 and wear rates of 10−9 to 10−1° mm3/N.m in inert-gas environments (e.g., dry nitrogen and argon). The film was grown on steel and sapphire substrates in a plasma enhanced chemical vapor deposition system that uses using a hydrogen-rich plasma. Employing a combination of surface and structure analytical techniques, they explored the structural chemistry of the resultant DLC films and correlated these findings with the friction and wear mechanisms of the films. The results of tribological tests under a 10-N load (creating initial peak Hertz pressures of 1 and 2.2 GPa on steel and sapphire test pairs, respectively) and at 0.2 to 0.5 m/s sliding velocities indicated that a close correlation exists between the friction and wear coefficients of DLC films and the source gas chemistry. Specifically, films grown in source gases with higher hydrogen-to-carbon ratios had the lowest fiction coefficients and the highest wear resistance. The lowest friction coefficient (0.001) was achieved with a film on sapphire substrates produced in a gas discharge plasma consisting of 25% methane and 75% hydrogen.
Download or read book Synthesis of Superlow Friction Carbon Films from Highly Hydrogenated Methane Plasmas written by and published by . This book was released on 2000 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, we investigated the friction and wear performance of diamondlike carbon films (DLC) derived from increasingly hydrogenated methane plasmas. The films were deposited on steel substrates by a plasma-enhanced chemical vapor deposition process at room temperature and the tribological tests were performed in dry nitrogen. Tests results revealed a close correlation between the hydrogen in source gas plasma and the friction and wear coefficients of the DLC films. Specifically, films grown in plasmas with higher hydrogen-to-carbon ratios had much lower friction coefficients and wear rates than did films derived from source gases with lower hydrogen-to-carbon ratios. The lowest friction coefficient (0.003) was achieved with a film derived from 25% methane--75% hydrogen, while a coefficient of 0.015 was found for films derived from pure methane. Similar correlations were observed for wear rates. Films derived from hydrogen-rich plasmas had the least wear, while films derived from pure methane suffered the highest wear. We used a combination of surface analytical methods to characterize the structure and chemistry of the DLC films and worn surfaces.
Download or read book Tribology of Diamond like Carbon Films written by Christophe Donnet and published by Springer Science & Business Media. This book was released on 2007-12-06 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Superlubricity and Wearless Sliding in Diamondlike Carbon Films written by and published by . This book was released on 2001 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diamondlike carbon (DLC) films have attracted great interest in recent years mainly because of their unusual optical, electrical, mechanical, and tribological properties. Such properties are currently being exploited for a wide range of engineering applications including magnetic hard disks, gears, sliding and roller bearings, scratch resistant glasses, biomedical implants, etc. Systematic studies on carbon-based materials in our laboratory have led to the development of a new class of amorphous DLC films that provide extremely low friction and wear coefficients of 0.001 to 0.005 and 10−11 to 10−1° mm3 /N.m, respectively, when tested in inert-gas or high-vacuum environments. These films were produced in highly hydrogenated gas discharge plasmas by a plasma enhanced chemical vapor deposition process at room temperature. The carbon source gases used in the deposition of these films included methane, acetylene, and ethylene. Tribological studies in our laboratory have established a very close correlation between the composition of the plasmas and the friction and wear coefficients of the resultant DLC films. Specifically, the friction and wear coefficients of DLC films grown in plasmas with higher hydrogen-to-carbon ratios were much lower than films derived from source gases with lower hydrogen-to-carbon ratios. Fundamental tribological and surface analytical studies have led us to conclude that hydrogen (within the film, as well as on the sliding surfaces) is extremely important for the superlubricity and wearless sliding behavior of these films. Based on these studies, a mechanistic model is proposed to explain the superlow friction and wear properties of the new DLC films.
Download or read book Synthesis and Characterization of Diamond like Carbon Coatings Deposited by Plasma Source Ion Implantation and Conventional Ion Beam Assisted Deposition Processes written by Brian M. Stout and published by . This book was released on 1999 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diamond-like carbon coatings produced by Plasma Source Ion Implantation (PSII) and beamline Ion Beam Assisted Deposition (IBAD) were synthesized and studied. Gas pressure and electrical current were used as variables to design four independent PSII test sets. Beamline IBAD samples were produced with a pre-optimized set of parameters. Profilometry measurements showed the films to have thicknesses between 1.44 +/- 09 and 1.64 +/- 04 microns and to possess very low roughness averages, ranging from 14 +/- 3 to 28 +/- 3 nm, which correlate with substrate surface roughness. Atomic Force Microscopy revealed that diamond-like carbon crystal sizes varied significantly with chamber pressure. Crystals were generally spherical in shape suggesting that films were highly amorphous. Microhardness and nanohardness test results showed the hardest films to be greater than 3 times the hardness of untreated steel. The elastic modulus of the films, measured during the nanohardness test, was directly related to film hardness. Fretting wear and Pin-on-Disk tests were performed to quantitatively assess the ability of films to resist wear. Fretting wear tests showed a dramatic decrease in friction for diamond-like carbon films with friction levels ranging from 10% to 30% of that of untreated steel. Pin-on-Disk tests revealed a significant improvement in wear resistance prior to stylus penetration into the substrate.
Download or read book Surface Modification and Mechanisms written by George E. Totten and published by CRC Press. This book was released on 2004-04-30 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Synthetic Diamond written by Karl E. Spear and published by John Wiley & Sons. This book was released on 1994-04-04 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt: A riveting look at the science, technology and people involved in overcoming early impracticalities of the fledgling chemical vapor deposition (CVD) synthesis method and its development in today's state of commercial readiness. Provides insights into numerous vapor phase techniques. Surveys the synthesis, structure, properties and applications of diamondlike carbon. Details current and rapidly emerging applications, manufacturing and markets.
Download or read book Cellular Response to Biomaterials written by Lucy Di Silvio and published by Elsevier. This book was released on 2008-12-22 with total page 649 pages. Available in PDF, EPUB and Kindle. Book excerpt: The response of cells to biomaterials is critical in medical devices. Traditionally inert biomaterials were used to minimise the reaction in cells in contact with the material. However, it has been realised that specific cell responses may be beneficial in such areas as encouraging adhesion, healing or cell multiplication. Cellular response to biomaterials discusses the response of cells to a wide range of biomaterials targeted at specific medical applications. Part one discusses cell responses to a variety of polymers and ceramics with chapters on such topics as degradable polymers and biocompatibility. Part two covers cell responses and regenerative medicine with coverage of themes such as vascular grafts, nerve repair and Bioglass®. Part three examines the effect of surfaces and proteins on cell response. Specific chapters review nano-engineered surfaces, the influence of plasma proteins on bone cell adhesion and surface modification of titanium implants. With its distinguished editor and team of international contributors, Cellular response to biomaterials is an essential read for those researching or studying medical devices in industry and academia. Examines the response of cells to a wide range of biomaterials targeted at specific medical applications Discusses cell responses and regenerative medicine with specific chapters on vascular grafts and nerve repair Assesses the effect of surfaces and proteins on cell response including the influence of plasma proteins on cell adhesion and surface modification of titanium implants
Download or read book Plasma deposited Amorphous Hydrogenated Carbon Films and Their Tribological Properties written by and published by . This book was released on 1989 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Encyclopedia of Biomaterials and Biomedical Engineering written by Gary Wnek and published by CRC Press. This book was released on 2008-05-28 with total page 3145 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by more than 400 subject experts representing diverse academic and applied domains, this multidisciplinary resource surveys the vanguard of biomaterials and biomedical engineering technologies utilizing biomaterials that lead to quality-of-life improvements. Building on traditional engineering principles, it serves to bridge advances in materials science, life sciences, nanotechnology, and cell biology to innovations in solving medical problems with applications in tissue engineering, prosthetics, drug delivery, biosensors, and medical devices. In nearly 300 entries, this four-volume Encyclopedia of Biomaterials and Biomedical Engineering, Second Edition, covers: essential topics integral to tissue engineering research: bioreactors, scaffolding materials and fabrication, tissue mechanics, cellular interaction, and development of major tissues and organs being attempted by researchers worldwide; artificial lungs and muscles, bio-artificial livers, and corneal, dental, inner ear, and total hip implants; tissue engineering of blood vessels, heart valves, ligaments, microvascular networks, skeletal muscle, and skin; bone remodeling, bone cement, and bioabsorbable bone plates and screws; controlled drug delivery, insulin delivery, and transdermal and ocular implant-based drug delivery; endovascular stent grafts, vascular grafts, and xenografts; 3-D medical imaging, electrical impedance imaging, and intravascular ultrasound; biomedical, protein adsorption, and in vivo cardiovascular modeling; polymer foams, biofunctional and conductive polymers, and electroactive polymeric materials; blood–material interactions, the bone–implant interface, host reactions, and foreign body responses and much more.
Download or read book Tribology of Mechanical Systems written by Jože Vižintin and published by American Society of Mechanical Engineers. This book was released on 2004 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a valuable resource for industry professionals as well as academics and researchers in the field."--Jacket.
Download or read book Diamond like Carbon Films Produced by Pulse biased DC Glow Discharge written by Ling Xie and published by . This book was released on 1994 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diamond Like Carbon Coatings written by Peerawatt Nunthavarawong and published by CRC Press. This book was released on 2022-08-08 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Friction and Wear Properties of Smooth Diamond Films Grown in Fullerene argon Plasmas written by and published by . This book was released on 1995 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, we describe the growth mechanism and the ultralow friction and wear properties of smooth (20-50 nm rms) diamond films grown in a microwave plasma consisting of Ar and fullerene (the carbon source). The sliding friction coefficients of these films against Si3N4 balls are 0.04 and 0.1 in dry N2 and air, which are comparable to that of natural diamond sliding against the same pin material, but is lower by factors of 5 to 10 than that afforded by rough diamond films grown in conventional H2-CH4 plasmas. Furthermore, the smooth diamond films produced in this work afforded wear rates to Si3N4 balls that were two to three orders of magnitude lower than those of H2-CH4 grown films. Mechanistically, the ultralow friction and wear properties of the fullerene-derived diamond films correlate well with their initially smooth surface finish and their ability to polish even further during sliding. The wear tracks reach an ultrasmooth (3-6 nm rms) surface finish that results in very little abrasion and ploughing. The nanocrystalline microstructure and exceptionally pure sp3 bonding in these smooth diamond films were verified by numerous surface and structure analytical methods, including x-ray diffraction, high-resolution AF-S, EELS, NEXAFS, SEM, and TEM. An AFM instrument was used to characterize the topography of the films and rubbing surfaces.
Download or read book Modern Tribology Handbook Two Volume Set written by Bharat Bhushan and published by CRC Press. This book was released on 2000-12-28 with total page 1760 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent research has led to a deeper understanding of the nature and consequences of interactions between materials on an atomic scale. The results have resonated throughout the field of tribology. For example, new applications require detailed understanding of the tribological process on macro- and microscales and new knowledge guides the rational
