Effects Of Thermal Gradient And Cyclic Oxidation On The Delamination And Lifetime Of High Temperature Protective Coatings
DOWNLOAD
Download Effects Of Thermal Gradient And Cyclic Oxidation On The Delamination And Lifetime Of High Temperature Protective Coatings PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Effects Of Thermal Gradient And Cyclic Oxidation On The Delamination And Lifetime Of High Temperature Protective Coatings book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Effects Of Thermal Gradient And Cyclic Oxidation On The Delamination And Lifetime Of High Temperature Protective Coatings
DOWNLOAD
Author : Shuhong Dong
language : en
Publisher:
Release Date : 2018
Effects Of Thermal Gradient And Cyclic Oxidation On The Delamination And Lifetime Of High Temperature Protective Coatings written by Shuhong Dong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Thermal barrier coatings have been widely used to provide thermal protection to components in the hot section of gas turbines. This research focuses on two influencing factors on coating behavior: thermal gradient and cyclic oxidation. The delamination mechanics under thermal gradient is analyzed, taking thermally grown oxide into consideration. Coatings experience thermal gradients at different stages during actual service flight. One is due to engine power shut down when landing and the other due to internal cooling of the substrate. Thermally grown oxide (TGO) also acts as a critical factor in delamination mechanics. The induced stress gradient and corresponding energy release rate for interface delamination and shallower delamination are presented. Mechanism maps that explain the criteria for preventing delamination from developing and propagating are established. Three cooling trajectories are envisaged to analyze the variation in the possibility of delamination. Multilayer coatings used in components of the hot section of aero turbine engines also experience cyclic temperature variation during flight cycles. As experiment conditions vary and coating performance is improved, the time required to run through the test of coating failure can be both time-consuming and prohibitive. Therefore, protocols providing prediction of quantified coating behavior are in demand to shorten life-time tests. Curves of mass change are obtained from quantifying scale growth and loss by different models such as Cyclic Oxidation Spall Program (COSP). A modification is made by combining COSP and a mechanic based model to obtain critical parameters for lifetime prediction from short time experiment. The time for coatings to reach peak temperature during cycling is discovered to influence prominently on modeling results. Predictions for several coating compositions and cycling conditions are consistent with the data from the existing experiments of the coating system.
Metallurgical Coatings And Thin Films 1990
DOWNLOAD
Author : B.D. Sartwell
language : en
Publisher: Elsevier
Release Date : 2012-12-02
Metallurgical Coatings And Thin Films 1990 written by B.D. Sartwell and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-02 with Technology & Engineering categories.
Metallurgical Coatings and Thin Films 1990 presents the Proceedings of the 17th International Conference on Metallurgical Coatings and 8th International Conference on Thin Films, held in San Diego, California on April 2-6, 1990. It contains 219 papers covering a wide range of topics related to metallurgical coatings and thin films, including high temperature coatings, hard coatings, diamond films, tribology, and ion beam modification. Organized into 99 chapters, this volume begins with a discussion of a thermochemical model for diamond growth from the vapor phase and an experiment in large area diamond coating using a combustion flame torch in its traversing mode. It then explores the properties of diamond films, preparation of diamond-like carbon films using various ion-beam-assisted techniques, deposition of diamond-like films by laser ablation, and coating of cubic BN films on different substrates. The book examines surface processes and rate-determining steps in plasma-induced chemical vapor deposition, and addition of rare earths to improve scale adherence on heat-resisting alloys and coatings. The reader is introduced to high temperature wear and clearance control coatings, thermal barrier coatings, and corrosion resistant coatings. The book also discusses modification of coatings/surfaces to reduce friction; the mechanics of the tribology of thin films systems; mechanochemical interactions in the tribological behavior of materials; analysis and micromechanical testing of tribological coatings; surface modification using directed ion beams; and industrial equipment and processes. This book is a valuable resource for students and researchers interested in metallurgical coatings and thin films.
Thermal Spray Fundamentals
DOWNLOAD
Author : Maher I. Boulos
language : en
Publisher: Springer Nature
Release Date : 2021-10-19
Thermal Spray Fundamentals written by Maher I. Boulos and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-10-19 with Technology & Engineering categories.
This fully revised, industry-standard resource offers practical details on every aspect of the fundamentals necessary for understanding thermal spray technology, from powder all the way to the final part. The second edition is presented in a reader-friendly format that is split into four parts. Part I presents a review of thermal spray coating and its position in the broad field of surface modification technologies. Highlights of combustion and thermal plasmas are given with an expanded treatment of in-flight plasma-particle interactions. The second and third parts deal respectively with an updated presentation of thermal spray technologies and coating formation, including solution and suspension plasma spraying. The last part of the book includes a comparative analysis of different thermal spray processes, which is essential for the optimal selection of the appropriate thermal spray process in a given application. Coverage of system integration has been expanded with the addition of a detailed discussion of online instrumentation and process diagnostics and numerous examples of industrial scale spray booth designs. Attention is also given to coating finishing and health and safety issues. An extensive review is presented of thermal spray applications grouped in terms of process objectives and present use in different industrial sectors. This book will serve as an invaluable resource as a textbook for graduate courses in the field and as an exhaustive reference for professionals involved in the thermal spray field.
Oxidation Behaviour Of Mcralx Coatings
DOWNLOAD
Author : Pimin Zhang
language : en
Publisher: Linköping University Electronic Press
Release Date : 2018-02-12
Oxidation Behaviour Of Mcralx Coatings written by Pimin Zhang and has been published by Linköping University Electronic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-02-12 with categories.
MCrAlY coatings (M=Ni and/or Co) have been widely used for the protection of superalloy components against oxidation and hot corrosion in the hot sections of gas turbines. The drive to improve engine combustion efficiency while reducing emissions by increasing the operation temperature brings a big challenge for coating design. As a result, the need for improvement of MCrAlY coatings for better oxidation resistance is essential. Formation of a stable, dense, continuous, and slow-growing ?-Al2O3 layer, on the MCrAlY coating surface, is the key to oxidation protection, since the protective ?-Al2O3 scale offers superior oxidation resistance due to its lower oxygen-diffusion rate as compared with other oxides. The ability of a MCrAlY coating to form and maintain such a protective scale depends on the coating composition and microstructure, and can be improved through optimization of deposition parameters, modification of coating surface conditions, and so on. Part of this thesis work focuses on studying the effect of post-deposition surface treatments on the oxidation behavior of MCrAlX coatings (X can be yttrium and/or other minor alloying elements). The aim is to gain fundamental understanding of alumina scale evolution during oxidation which is important for achieving improved oxidation resistance of MCrAlX coatings. Oxide scale formed on coatings at initial oxidation stage and the effect of surface treatment were investigated by a multi-approach study combining photo-stimulated luminescence, microstructural observation and weight gain. Results showed that both mechanically polished and shot-peened coatings exhibited superior performance due to rapid formation of ?-Al2O3 fully covering the coating and suppressing growth of transient alumina, assisted by the high density of ?-Al2O3 nuclei on surface treatment induced defects. The early development of a two-layer alumina scale, consisting of an inward-grown inner ?-Al2O3 layer and an outer layer transformed from outward-grown transient alumina, resulted in a higher oxide growth rate of the as-sprayed coating. The positive effect of the surface treatments on retarding oxide scale growth and suppressing formation of spinel was also observed in oxidation test up to 1000 hrs. As the oxidation proceeds to the close-to-end stage, a reliable criterion to estimate the capability of coating to form ?-Al2O3 is of great importance to accurately evaluate coating lifetime, which is the aim of the other part of the thesis work. Survey of published results on a number of binary Ni-Al and ternary Ni-Cr-Al, Ni-Al-Si systems shows that the empirical Al-concentration based criterion is inadequate to properly predict the formation of a continuous ?-Al2O3 scale. On the other hand, correlating the corresponding Al-activity data, calculated from measured chemical compositions using the Thermo-Calc software, to the experimental oxidation results has revealed a temperature dependent, critical Al-activity value for forming continuous ?-Al2O3 scale. To validate the criterion, long-term oxidation tests were performed on five MCrAlX coatings with varying compositions and the implementation of the Al-activity based criterion on these coatings successfully predicted ?-Al2O3 formation, showing a good agreement with experiment results.
Production Properties And Applications Of High Temperature Coatings
DOWNLOAD
Author : Pakseresht, Amir Hossein
language : en
Publisher: IGI Global
Release Date : 2018-01-12
Production Properties And Applications Of High Temperature Coatings written by Pakseresht, Amir Hossein and has been published by IGI Global this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-01-12 with Technology & Engineering categories.
Heat resistant layers are meant to withstand high temperatures while also protecting against all types of corrosion and oxidation. Therefore, the micro-structure and behavior of such layers is essential in understanding the functionality of these materials in order to make improvements. Production, Properties, and Applications of High Temperature Coatings is a critical academic publication which examines the methods of creation, characteristics, and behavior of materials used in heat resistant layers. Featuring coverage on a wide range of topics such as, thermal spray methods, sol-gel coatings, and surface nanoengineering, this book is geared toward students, academicians, engineers, and researchers seeking relevant research on the methodology and materials for producing effective heat resistant layers.
Ceramic Coatings For High Temperature Environments
DOWNLOAD
Author : Amirhossein Pakseresht
language : en
Publisher: Springer Nature
Release Date : 2024-01-06
Ceramic Coatings For High Temperature Environments written by Amirhossein Pakseresht and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-01-06 with Technology & Engineering categories.
This book addresses the recent trends in thermal and environmental barrier coatings and their applications in extreme environments. It introduces the state of the art in coating materials and processes for high and ultrahigh-temperature environments and identifies areas for improvement in materials selection, performance upgrades, design considerations, and manufacturing methods. This book also covers fundamental studies involving modelling, creating coating architectures, coating preparation methods, and coating capability throughout a wide temperature range. The book examines a variety of high-temperature coatings prepared through various synthesis processes such as thermal spraying, electron beam evaporation, and sol–gel methods. This book also covers ultrahigh-temperature ceramic (UHTC) materials and provides a brief overview of the synthesis method, densification processes, and coating methods along with the properties and applications of emerging high entropy UHTCs. With contributions from international researchers active in the field, this edited book features the most recent and up-to-date literature references for a broad readership consisting of academic and industrial professionals. It is suitable for graduate students as well as materials scientists and engineers working in the area of high and ultrahigh-temperature ceramic materials.
Furnace Cyclic Oxidation Behavior Of Multi Component Low Conductivity Thermal Barrier Coatings
DOWNLOAD
Author : Dong-Ming Zhu
language : en
Publisher: BiblioGov
Release Date : 2013-07
Furnace Cyclic Oxidation Behavior Of Multi Component Low Conductivity Thermal Barrier Coatings written by Dong-Ming Zhu and has been published by BiblioGov this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-07 with categories.
Ceramic thermal barrier coatings will play an increasingly important role in advanced gas turbine engines because of their ability to further increase engine operating temperatures and reduce cooling, thus helping achieve future engine low emission, high efficiency and improved reliability goals. Advanced multi-component zirconia-based thermal barrier coatings are being developed using an oxide defect clustering design approach to achieve the required coating low thermal conductivity and high temperature stability. Although the new composition coatings were not yet optimized for cyclic durability, an initial durability screening of the candidate coating materials was conducted using conventional furnace cyclic oxidation tests. In this paper, furnace cyclic oxidation behavior of plasma-sprayed zirconia-based defect cluster thermal barrier coatings was investigated at 1163 C using 45 min hot cycles. The ceramic coating failure mechanisms were studied using scanning electron microscopy (SEM) combined with X-ray diffraction (XRD) phase analysis after the furnace tests. The coating cyclic lifetime is also discussed in relation to coating processing, phase structures, dopant concentration, and other thermo-physical properties.
Development And Evaluation Of High Temperature Protective Coatings For Columbium Alloys Part Ii Coating Evaluation
DOWNLOAD
Author : R. A. JEFFERYS
language : en
Publisher:
Release Date : 1961
Development And Evaluation Of High Temperature Protective Coatings For Columbium Alloys Part Ii Coating Evaluation written by R. A. JEFFERYS and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with categories.
A comparative evaluation was made of 18 coatingbase metal systems, six different coatings applied to 3 Nb base materials (D-31 alloy, F-48 alloy and unalloyed Nb). The 18 coating-base metal systems were tested under the same conditions in cyclic oxidation (2300 and 2500 F), thermal shock (2 00 to 250 F), bend-oxidation (2500 F) nd stress-oxidation (2500 F) plus tensile tests. The tests produced directly comparable data between the coating-base metal systems relating to the protective nature of each coating and the effect of the coating and the coating treatment on the mechanical properties of the substrate. (Author).
Coatings For High Temperature Environments
DOWNLOAD
Author : Amirhossein Pakseresht
language : en
Publisher: Springer Nature
Release Date : 2023-12-05
Coatings For High Temperature Environments written by Amirhossein Pakseresht and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-12-05 with Technology & Engineering categories.
This book addresses the recent trends in high-temperature coatings that are used to provide oxidation and wear resistance to metallic/ceramic components in extreme environments. Ceramics, intermetallics, organosilicon polymers, cermets, and other materials with great thermal stability have long been recognized for these applications. This book introduces the state of the art in coating materials and processes for high-temperature environments and identifies areas for improvement in materials selection, performance upgrades, design considerations, and manufacturing methods. The book covers a variety of high-temperature coatings prepared through various synthesis processes such as thermal spraying, physical vapor deposition, electrodeposition, and sol–gel methods. It covers corrosion/oxidation, phase stability, and thermal and mechanical behavior of high-temperature coating materials having greater thermal stability. With contributions from international researchers active in the field, this edited book features the most recent and up-to-date literature references for a broad readership consisting of academic and industrial professionals. It is suitable for graduate students as well as scientists and engineers working in the area of anti-corrosion and anti-wear resistant high-temperature coatings for industrial applications.
Development And Evaluation Of High Temperature Protective Coatings For Columbium Alloys Part I Coating Development
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1961
Development And Evaluation Of High Temperature Protective Coatings For Columbium Alloys Part I Coating Development written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with categories.
A detailed study was made of the formation and protective nature of surface alloy diffusion coatings for columbium. Vacuum vapor deposited, diffusion alloy coatings combining chromium, titanium and silicon were found to protect D-31 alloy f-48 alloy an unalloyed colu bium from surface oxidation or internal contamination for considerable lengths of time in air in the range of 2000 to 2600 F and for shorter periods up to 2800 F. Tests on the coating-base metal systems included cyclic oxidation, thermal shock and high velocity-hot gas erosion in a plasma flame. (Author).