Download or read book Tribological Evaluation of Magnetron Sputtered Coating for Military Applications written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a continuing requirement for high-performance tribological coatings in both commercial and military applications. To maximize system performance, corresponding improvements in wear resistance, high-temperature stability, Corrosion behavior, and bearing durability must be realized. In our ongoing study, a number of different coatings were applied to 52100 bearing steel, 4340 steel, Inconel 718, and Ti-6Al-4V to improve wear characteristics, corrosion resistance, and rolling contact fatigue behavior. This report deals with CrN, TiN, W, and Ta coatings deposited by magnetron sputtering. Data on corrosion, Falex annular wear, ball-on-disk, and rolling contact fatigue are presented.

Download or read book An Investigation of Material Properties and Tribological Performance of Magnetron Sputtered Thin Film Coatings written by Harpal Singh and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation is divided into two categories based upon lubrication functionality and its application. The categories are: Dry/Solid film lubrication with thin film coatings and Fluid film lubrication with thin film coatings. Thin film coatings examined in this work were deposited using closed field unbalanced magnetron sputtering and RF-DC coupled magnetron sputtering systems. In Dry/Solid film lubrication, the mechanical, structural and tribological properties of two Molybdenum disulphide (MoS2) based coatings are examined and evaluated. Among the two coatings, one coating is doped with Ti (Ti-MoS2) and the other is a combination of metal, lubricant and oxide (Sb2O3/Au - MoS2). These coatings are known to provide low friction in vacuum environments. The goal of this work was to evaluate friction and wear performance of MoS2 doped coatings in unidirectional and reciprocating sliding contact under different environmental conditions. Sliding contact results showed friction and wear dependence on temperature and humidity. The formation and removal of transfer films and the recrystallization and reorientation of basal layers on the steel counterface was observed as the mechanism for low friction. Structural analysis revealed a relationship between the microstructural properties and tribological performance. It was also observed that the addition of dopants (Ti, Au, Sb2O3) improved the mechanical properties as compared to pure MoS2 coatings. Further, the rolling contact performance of the coatings was measured on a five ball on rod tribometer and a Thrust bearing tribometer under vacuum and air environments. The rolling contact experiments indicated that life of the rolling components depend on the amount of material present between the contacts. Fluid film lubrication with thin film coatings investigates the possibilities to improve the performance and durability of tribological components when oils and thin films are synergistically coupled. In this work, the ability of a Diamond Like Carbon coating to increase the durability of contacting surfaces under boundary lubrication were studied. The performance of highly hydrogenated Diamond Like Carbon (DLC) was evaluated in a mixed sliding and rolling contact. Experimental results show significant improvement in fatigue life of steel specimens after coating with a highly hydrogenated Diamond Like Carbon coating. The improved fatigue life is attributed to the coating microstructure and the mechanical properties.

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1020 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wear of Engineering Materials written by Jeffery A. Hawk and published by CRC Press. This book was released on 1998-06 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Symposium proceedings contains information on some of the latest work involving the development, assessment, and application of wear-resistant materials. Nearly 60 papers by authors from more than 10 countries discuss fundamental and applied research in the areas of wear, erosion, and wear-corrosion of materials.

Download or read book Plasma Characterization and Tribological Evaluation of Sputter Deposited Molybdenum Disulfide base Solid Lubricated Coatings written by Asher Woolverton and published by . This book was released on 2001 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metals Abstracts written by and published by . This book was released on 1999-04 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tribological and Mechanical Properties of Multilayered Coatings written by Omer Ahmed and published by . This book was released on 2017 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface coatings are widely used to improve properties of materials. Thin films are deposited based on the properties of the substrate material and applications. Titanium nitride is a hard ceramic material, which has excellent mechanical properties. The superior properties of titanium nitride can be utilized for coating soft materials (such as aluminum). Titanium nitride has various applications in machine tool coatings, fastener coatings and as protective coatings in corrosive environment. However, the friction coefficient of titanium nitride was rather high. To improve the coefficient of friction of the titanium nitride film, a thin layer of molybdenum disulfide was coated that acted as a solid lubricant. Molybdenum disulfide is known for its lubricating properties and it is commonly used to decrease friction. The titanium nitride films were coated by RF magnetron sputtering method and molybdenum disulfide films were coated by vacuum thermal evaporation technique. Aluminum alloy of grade 1100 was used as the substrate material as it is most commonly used material in industrial applications. The effect of film thickness, fabricating technique, operating temperature, substrate heating, post deposition annealing have been studied. The frictional properties and wear were studied using a pin on disc tribometer. The effect of applied normal loads, speed, and interface material were also studied. Zinc oxide thin films were studied for their tribological performance. Zinc oxide was deposited using radio frequency magnetron sputtering and sol-gel method. The substrates were heat treated (annealed) to further investigate the effect of annealing. The effect of film thickness, fabricating technique, operating temperature, substrate heating, post deposition annealing of zinc oxide were studied. The tribological properties were evaluated using a pin on disc tribometer setup. The surface coatings were also tested for Vickers Hardness. The change in coefficient of friction was found to be dependent on the coating composition, deposition time, heat treatment of coatings after deposition and several other factors. The results showed a consistent and considerable decrease in friction coefficient of molybdenum disulfide and zinc oxide coatings that were deposited for longer duration on as-received aluminum substrates. Consistent increase in the friction coefficient was observed after annealing due to decrease in hardness. This study showed several important parameters for titanium nitride, molybdenum disulfide and zinc oxide thin film coatings and it was expected that these techniques could be used to improve the tribological properties and surface hardness. Collected data at various operating loads, speeds and temperatures could be used to design more selective coatings.

Download or read book Ion Beam Deposited Metal Oxide and Fluoride Composite Coatings for High Temperature Tribological Applications written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wide temperature, solid lubricant films offer payoffs for military turbomachinery components: rub seals, face seals, fretting interfaces and bearings. Multilayer films of B4C/Mo, B4C/Cr, Zn/W, Ni/Ti, Au/Cr, W/MoS and AlCuFeCr films were deposited by planar magnetron sputtering or ion bombardment assisted deposition (IBAD), and evaluated for adhesion, friction and wear properties from room temperature to as high as 1100 deg F. Oxidized Zn/W and W/MoS2 films exhibited low friction coefficients at room temperature. However, only AlFeCuCr quasicrystalline films consistently produced low friction coefficients at high temperature, suggesting that these films warrant further investigation. High friction coefficients obtained with IBAD Ni-Ti films at 1100 deg F were especially puzzling given previous Southwest Research Institute results that showed low friction values at high temperature.

Download or read book Tribological Evaluation of Hard Coatings written by Bojan Podgornik and published by . This book was released on 2015 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structural Mechanical and Tribological Characterization of Nanoscale Multilayer TiN CrN Coatings Synthesized by DC Unbalanced Magnetron Sputtering written by Manohar Shenoy Konchady and published by . This book was released on 2009 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies mechanical, structural, and tribological properties of nanoscale titanium nitride/chromium nitride (TiN/CrN) multilayer coatings and compares these with single layer TiN and CrN coatings. Optimizes process parameters for the deposition of TiN coating and CrN coating by reactive sputtering of titanium and chromium, respectively, in a nitrogen atmosphere. Correlates mechanical, structural, and tribological properties for multilayer Tin/CrN coatings.

Download or read book Tribological Evaluation of Foil and Thrust Runner Coatings for Use in Oil free Turbomachinery written by Christopher E. Fanning and published by . This book was released on 2005 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Coatings Tribology written by K. Holmberg and published by Elsevier. This book was released on 1994-07-15 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a general view on thin surface coatings used for tribological applications and it is based on the current state of understanding. The mechanisms of friction and wear in sliding and rolling contacts of coated surfaces are described. Basic information on coating techniques, tribology and surface mechanisms is given. Based on collected experimental works information is given on the properties of thin soft coatings, such as polymer, lamellar solid and soft metal coatings; thin hard coatings, such as nitride, carbide, oxide, boride and diamond and diamond-like coatings; and multi-component and multi-layer coatings. The influence of interface layers and lubricants is highlighted. The methods available for characterization of coated surfaces and for mechanical and chemical evaluation of their tribological properties are described. Tribological evaluation methods for accelerated and field testing and the need for standardization of quality assurance procedures are discussed. A methodology for the selection of thin coatings for tribological applications is presented and knowledge based expert system approaches for coating selection are reviewed. For different application examples, the basic tribological contact mechanisms are described and the possibilities for improving their tribological properties by using surface coatings are discussed. The application examples include sliding and rolling bearings, gears, tools for cutting and forming, erosion resistant applications, magnetic recording systems and bio-medical implants.

Download or read book The Foundations of Vacuum Coating Technology written by Donald M. Mattox and published by William Andrew. This book was released on 2018-08-21 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Foundations of Vacuum Coating Technology, Second Edition, is a revised and expanded version of the first edition, which was published in 2003. The book reviews the histories of the various vacuum coating technologies and expands on the history of the enabling technologies of vacuum technology, plasma technology, power supplies, and low-pressure plasma-enhanced chemical vapor deposition. The melding of these technologies has resulted in new processes and products that have greatly expanded the application of vacuum coatings for use in our everyday lives. The book is unique in that it makes extensive reference to the patent literature (mostly US) and how it relates to the history of vacuum coating. The book includes a Historical Timeline of Vacuum Coating Technology and a Historical Timeline of Vacuum/Plasma Technology, as well as a Glossary of Terms used in the vacuum coating and surface engineering industries. History and detailed descriptions of Vacuum Deposition Technologies Review of Enabling Technologies and their importance to current applications Extensively referenced text Patents are referenced as part of the history Historical Timelines for Vacuum Coating Technology and Vacuum/Plasma Technology Glossary of Terms for vacuum coating

Download or read book Tribologie Pour Les Syst mes A rospatiaux written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Structures and Materials Panel. Meeting and published by . This book was released on 1996 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Temperature Coatings written by Sudhangshu Bose and published by Butterworth-Heinemann. This book was released on 2017-11-27 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: High Temperature Coatings, Second Edition, demonstrates how to counteract the thermal effects of rapid corrosion and degradation of exposed materials and equipment that can occur under high operating temperatures. This is the first true practical guide on the use of thermally protective coatings for high-temperature applications, including the latest developments in materials used for protective coatings. It covers the make-up and behavior of such materials under thermal stress and the methods used for applying them to specific types of substrates, as well as invaluable advice on inspection and repair of existing thermal coatings. With his long experience in the aerospace gas turbine industry, the author has compiled the very latest in coating materials and coating technologies, as well as hard-to-find guidance on maintaining and repairing thermal coatings, including appropriate inspection protocols. The book is supplemented with the latest reference information and additional support to help readers find more application- and industry-type coatings specifications and uses. Offers an overview of the underlying fundamental concepts of thermally-protective coatings, including thermodynamics, energy kinetics, crystallography and equilibrium phases Covers essential chemistry and physics of underlying substrates, including steels, nickel-iron alloys, nickel-cobalt alloys and titanium alloys Provides detailed guidance on a wide variety of coating types, including those used against high temperature corrosion and oxidative degradation and thermal barrier coatings

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ceramic Coatings written by Feng Shi and published by BoD – Books on Demand. This book was released on 2012-02-24 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main target of this book is to state the latest advancement in ceramic coatings technology in various industrial fields. The book includes topics related to the applications of ceramic coating covers in enginnering, including fabrication route (electrophoretic deposition and physical deposition) and applications in turbine parts, internal combustion engine, pigment, foundry, etc.