Upper Temperature Limit of Environmental Barrier Coatings Based on Mullite and BSAS PDF Download

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 28

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Author: Kang N. Lee
Publisher: MDPI
ISBN: 3039365177
Category : Science
Languages : en
Pages : 168

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Book Description
The global increase in air travel will require commercial vehicles to be more efficient than ever before. Advanced engine hot section materials are a key technology required to keep fuel consumption and emission to a minimum in next-generation gas turbines. Ceramic matrix composites (CMCs) are the most promising material to revolutionize gas turbine hot section materials technology because of their excellent high‐temperature properties. Rapid surface recession due to volatilization by water vapor is the Achilles heel of CMCs. Environmental barrier coatings (EBCs) is an enabling technology for CMCs, since it protects CMCs from water vapor. The first CMC component entered into service in 2016 in a commercial engine, and more CMC components are scheduled to follow within the next few years. One of the most difficult challenges to CMC components is EBC durability, because failure of EBC leads to a rapid reduction in CMC component life. Key contributors to EBC failure include recession, oxidation, degradation by calcium‐aluminum‐magnesium silicates (CMAS) deposits, thermal and thermo‐mechanical strains, particle erosion, and foreign object damage (FOD). Novel EBC chemistries, creative EBC designs, and robust processes are required to meet EBC durability challenges. Engine-relevant testing, characterization, and lifing methods need to be developed to improve EBC reliability. The aim of this Special Issue is to present recent advances in EBC technology to address these issues. In particular, topics of interest include but are not limited to the following: • Novel EBC chemistries and designs; • Processing including plasma spray, suspension plasma spray, solution precursor plasma spray, slurry process, PS-PVD, EB-PVD, and CVD; • Testing, characterization, and modeling; • Lifing.

Author: Amirhossein Pakseresht
Publisher: Springer Nature
ISBN: 3031408098
Category : Technology & Engineering
Languages : en
Pages : 493

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Book Description
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.

Author: Rodrigo Martín Gómez
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Current gas turbines have reached their maximum operating temperature due to the limitations imposed by the turbine blades materials. In order to improve the gas turbine efficiency it is mandatory to be able to achieve higher temperatures in the combustion chamber. Therefore, ceramic materials are excellent candidates for turbine blades materials. Silicon based ceramics like silicon carbide have shown great properties for this application, but they suffer severe hot corrosion in combustion environments. Thus, several environmental barrier coatings (EBCs) solutions based on mullite has been tested for years, as it presents great thermal expansion match with silicon based ceramics. One of the researches in this field involves the deposition of mullite by chemical vapour deposition (CVD), which allows the gradation of the composition to alumina-rich mullite at the outer surface that gives great results at inhibiting the environmental degradation of these materials. The evaluation of the mechanical properties of these coatings is, therefore, relevant in order to grant their adherence and avoid their pull out after thermal cycles or little impacts. Hence, different CVD mullite coated silicon carbide samples have been studied in order to extract their mechanical properties, estimate their fracture toughness and study their behaviour under scratch conditions. Furthermore, the possible evolution of these properties after long term expositions to high temperatures was also assed in order to grant the mechanical stability of these coatings. The results show a relation between the mechanical properties and the characteristics of the coating, especially with the Al/Si ratio. Good adherence to the substrate and a high tendency of the coating to absorb damage without delamination were also found, with higher ductility in the case of the near stoichiometric mullite samples. In addition, thanks to the heat treatment applied to samples, it was found that samples with low Al/Si ratio tend to improve their hardness and elastic modulus, but behave slightly more brittlely; while the samples with higher ratios apparently maintain their properties but may suffer severe cracking as a result of possible residual stresses introduced during the deposition process.

Author: Dongming Zhu
Publisher: John Wiley & Sons
ISBN: 0470291737
Category : Technology & Engineering
Languages : en
Pages : 334

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Book Description
Recent advances in coating development, processing, microstructure and property characterization, and life prediction are included in this book, which came from the proceedings of the 30th International Conference on Advanced Ceramics and Composites, January 22-27, 2006, Cocoa Beach, Florida. Organized and sponsored by The American Ceramic Society and The American Ceramic Society's Engineering Ceramics Division in conjunction with the Nuclear and Environmental Technology Division.. Integrated structural, environmental properties and functionality through advanced coating processing and structural design are emphasized in this book.

Author: Nuria Espallargas
Publisher: Elsevier
ISBN: 0857097741
Category : Science
Languages : en
Pages : 301

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Future Development of Thermal Spray Coatings discusses the latest developments and research trends in the thermal spray industry. The book presents a timely guide to new applications and techniques. After an introduction to thermal spray coatings by the editor, Part One covers new types and properties of thermal spray coatings. Chapters look at feedstock suspensions and solutions, the application of solution precursor spray techniques to obtain ceramic films and coatings, cold spray techniques and warm spray technology amongst others. Part Two of the book moves on to discuss new applications for thermal spray coatings such as the use of thermal spray coatings in environmental barrier coatings, thermal spray coatings in renewable energy applications and manufacturing engineering in thermal spray technologies by advanced robot systems and process kinematics. Timely guide on the current advancements and research trends in thermal spray technology Reviews different types of thermal spray coatings Presents a wide variety of applications for this emerging technology

Author: Mrityunjay Singh
Publisher: John Wiley & Sons
ISBN: 1119407532
Category : Technology & Engineering
Languages : en
Pages : 590

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Book Description
Global population growth and tremendous economic development has brought us to the crossroads of long-term sustainability and risk of irreversible changes in the ecosystem. Energy efficient and ecofriendly technologies and systems are critically needed for further growth and sustainable development. While ceramic matrix composites were originally developed to overcome problems associated with the brittle nature of monolithic ceramics, today the composites can be tailored for customized purposes and offer energy efficient and ecofriendly applications, including aerospace, ground transportation, and power generation systems. The 9th International Conference on High Temperature Ceramic Matrix Composites (HTCMC 9) was held in Toronto, Canada, June 26-30, 2016 to discuss challenges and opportunities in manufacturing, commercialization, and applications for these important material systems. The Global Forum on Advanced Materials and Technologies for Sustainable Development (GFMAT 2016) was held in conjunction with HTCMC 9 to address key issues, challenges, and opportunities in a variety of advanced materials and technologies that are critically needed for sustainable societal development. This Ceramic Transactions volume contains a collection of peer reviewed papers from the 16 below symposia that were submitted from these two conferences Design and Development of Advanced Ceramic Fibers, Interfaces, and Interphases in Composites- A Symposium in Honor of Professor Roger Naslain Innovative Design, Advanced Processing, and Manufacturing Technologies Materials for Extreme Environments: Ultrahigh Temperature Ceramics (UHTCs) and Nano-laminated Ternary Carbides and Nitrides (MAX Phases) Polymer Derived Ceramics and Composites Advanced Thermal and Environmental Barrier Coatings: Processing, Properties, and Applications Thermomechanical Behavior and Performance of Composites Ceramic Integration and Additive Manufacturing Technologies Component Testing and Evaluation of Composites CMC Applications in Transportation and Industrial Systems Powder Processing Innovation and Technologies for Advanced Materials and Sustainable Development Novel, Green, and Strategic Processing and Manufacturing Technologies Ceramics for Sustainable Infrastructure: Geopolymers and Sustainable Composites Advanced Materials, Technologies, and Devices for Electro-optical and Medical Applications Porous Ceramics for Advanced Applications Through Innovative Processing Multifunctional Coatings for Sustainable Energy and Environmental Applications

Author: Hua-Tay Lin
Publisher: John Wiley & Sons
ISBN: 1118807693
Category : Technology & Engineering
Languages : en
Pages : 141

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Ceramic Engineering and Science Proceedings Volume 34, Issue 3 - Advanced Ceramic Coatings and Materials for Extreme Environments III A collection of 12 papers from The American Ceramic Society’s 37th International Conference on Advanced Ceramics and Composites, held in Daytona Beach, Florida, January 27-February 1, 2013. This issue includes papers presented in the Advanced Ceramic Coatings and Systems and Next Generation Technologies for Innovative Surface Coatings symposia.

Author: Mateus Lenz Leite
Publisher: Cuvillier Verlag
ISBN: 3736965826
Category : Science
Languages : en
Pages : 130

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Book Description
In face of an accelerating climate change, the reduction and substitution of fossil fuels is crucial to decarbonize energy production. Gas turbines can operate with versatile fuel sources like natural gas and future fuels such as hydrogen and ammonia. In a next future, thermal efficiencies above 65% are expected to be achieved by implementing non-oxide silicon-based (i.e. Si₃N₄, SiC and SiC/SiC) ceramic components. However, water vapor is one of the main combustion products, which leads to rapid corrosion due to the volatilization of the protective SiO₂ layer above 1200 °C. Hence, an in situ generated Yb₂Si₂O₇ double layered environmental barrier coating system composed of silazanes and the active fillers Yb2O3 and Si was processed at 1415 °C for 5 h in air to protect Si3N4, SiC and SiC/SiC from corrosion. The easy to apply coating system exhibits a dense microstructure with a thickness of up to 150 µm, besides an excellent adhesion strength (36.9 ± 6.2 MPa), hardness (6.9 ± 1.6 GPa) and scratch resistance (28 N). It remarkably overcomes over 15 thermal cycles between 1200 and 20 °C and shows almost no mass loss after harsh hot gas corrosion at 1200 °C for 200 h (pH2O = 0.15 atm, v = 100 m s⁻¹).

Author: Sam Zhang
Publisher: CRC Press
ISBN: 1000408418
Category : Technology & Engineering
Languages : en
Pages : 375

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Book Description
Hard or protective coatings are widely used in conventional and modern industries and will continue to play a key role in future manufacturing, especially in the micro and nano areas. Protective Thin Coatings Technology highlights the developments and advances in the preparation, characterization, and applications of protective micro-/nanoscaled films and coatings. This book Covers technologies for sputtering of flexible hard nanocoatings, deposition of solid lubricating films, and multilayer transition metal nitrides Describes integrated nanomechanical characterization of hard coatings, corrosion and tribo-corrosion of hard coatings, and high entropy alloy films and coatings Investigates thin films and coatings for high-temperature applications, nanocomposite coatings on magnesium alloys, and the correlation between coating properties and industrial applications Features various aspects of hard coatings, covering advanced sputtering technologies, structural characterizations, and simulations, as well as applications This first volume in the two-volume set, Protective Thin Coatings and Functional Thin Films Technology, will benefit industry professionals and researchers working in areas related to semiconductors, optoelectronics, plasma technology, solid-state energy storages, and 5G, as well as advanced students studying electrical, mechanical, chemical, and material engineering.