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Author: Tianqi Ren
Publisher:
ISBN:
Category :
Languages : en
Pages : 213
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Book Description
Tantalum carbide (TaC) belongs to a class of materials known as ultra-high temperatureceramics (UHTCs) with unique combinations of physical, chemical and electronic properties. The following study presents for the first time the morphologically controlled synthesis of TaC nanoparticles using a modified solvothermal method. X-ray diffraction revealed that highly crystalline TaC can be obtained with excellent phase purity. Doping by metallic species is shown to have significant impact on the final morphology of TaC nanoparticles. The shape selectivity and morphology evolution from round/irregular shapes to cubes and cuboctahedrons varies with the type of dopant, including Ni, Fe, Co, Y and Ni-Ti co-doping. Statistical abundance of over 80% particles with high-faceted morphologies were observed, significantly surpassing that of undoped samples (around 10%). Experimental interpretation was coupled by the Density Functional Theory (DFT) based calculation to probe the fundamental mechanisms responsible for the dopant-induced change in the growth habit of TaC nanoparticles. It was found that the major formation mechanisms include surface segregation of dopants, atomic orbital interaction between dopants and carbon, which caused the change in relative growth rate of facets. The probability of forming one type of faceted particles over another is governed by the surface energy distributions. The mechanisms and techniques explored herein are expected to be generally applicable to other transition metal-based ceramics thereby providing an unprecedented pathway towards the morphology tailoring of high-temperature materials. Principles of crystal growth and prior works for morphologically controlled synthesis of a variety of inorganic materials were also thoroughly reviewed.
Author: Tianqi Ren
Publisher:
ISBN:
Category :
Languages : en
Pages : 213
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Book Description
Tantalum carbide (TaC) belongs to a class of materials known as ultra-high temperatureceramics (UHTCs) with unique combinations of physical, chemical and electronic properties. The following study presents for the first time the morphologically controlled synthesis of TaC nanoparticles using a modified solvothermal method. X-ray diffraction revealed that highly crystalline TaC can be obtained with excellent phase purity. Doping by metallic species is shown to have significant impact on the final morphology of TaC nanoparticles. The shape selectivity and morphology evolution from round/irregular shapes to cubes and cuboctahedrons varies with the type of dopant, including Ni, Fe, Co, Y and Ni-Ti co-doping. Statistical abundance of over 80% particles with high-faceted morphologies were observed, significantly surpassing that of undoped samples (around 10%). Experimental interpretation was coupled by the Density Functional Theory (DFT) based calculation to probe the fundamental mechanisms responsible for the dopant-induced change in the growth habit of TaC nanoparticles. It was found that the major formation mechanisms include surface segregation of dopants, atomic orbital interaction between dopants and carbon, which caused the change in relative growth rate of facets. The probability of forming one type of faceted particles over another is governed by the surface energy distributions. The mechanisms and techniques explored herein are expected to be generally applicable to other transition metal-based ceramics thereby providing an unprecedented pathway towards the morphology tailoring of high-temperature materials. Principles of crystal growth and prior works for morphologically controlled synthesis of a variety of inorganic materials were also thoroughly reviewed.
Author: William G. Fahrenholtz
Publisher: John Wiley & Sons
ISBN: 111892441X
Category : Technology & Engineering
Languages : en
Pages : 601
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Book Description
The first comprehensive book to focus on ultra-high temperature ceramic materials in more than 20 years Ultra-High Temperature Ceramics are a family of compounds that display an unusual combination of properties, including extremely high melting temperatures (>3000°C), high hardness, and good chemical stability and strength at high temperatures. Typical UHTC materials are the carbides, nitrides, and borides of transition metals, but the Group IV compounds (Ti, Zr, Hf) plus TaC are generally considered to be the main focus of research due to the superior melting temperatures and stable high-melting temperature oxide that forms in situ. Rather than focusing on the latest scientific results, Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications broadly and critically combines the historical aspects and the state-of-the-art on the processing, densification, properties, and performance of boride and carbide ceramics. In reviewing the historic studies and recent progress in the field, Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications provides: Original reviews of research conducted in the 1960s and 70s Content on electronic structure, synthesis, powder processing, densification, property measurement, and characterization of boride and carbide ceramics. Emphasis on materials for hypersonic aerospace applications such as wing leading edges and propulsion components for vehicles traveling faster than Mach 5 Information on materials used in the extreme environments associated with high speed cutting tools and nuclear power generation Contributions are based on presentations by leading research groups at the conference "Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications II" held May 13-19, 2012 in Hernstein, Austria. Bringing together disparate researchers from academia, government, and industry in a singular forum, the meeting cultivated didactic discussions and efforts between bench researchers, designers and engineers in assaying results in a broader context and moving the technology forward toward near- and long-term use. This book is useful for furnace manufacturers, aerospace manufacturers that may be pursuing hypersonic technology, researchers studying any aspect of boride and carbide ceramics, and practitioners of high-temperature structural ceramics.
Author: Low, I. M.
Publisher: IGI Global
ISBN: 1466640677
Category : Technology & Engineering
Languages : en
Pages : 679
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Book Description
Ceramics are a versatile material, more so than is widely known. They are thermal resistant, poor electrical conductors, insulators against nuclear radiation, and not easily damaged, making ceramics a key component in many industrial processes. MAX Phases and Ultra-High Temperature Ceramics for Extreme Environments investigates a new class of ultra-durable ceramic materials, which exhibit characteristics of both ceramics and metals. Readers will explore recent advances in the manufacturing of ceramic materials that improve their durability and other physical properties, enhancing their overall usability and cost-effectiveness. This book will be of primary use to researchers, academics, and practitioners in chemical, mechanical, and electrical engineering. This book is part of the Research Essentials collection.
Author: Jose Luis Clabel Huaman
Publisher: Elsevier
ISBN: 0323907105
Category : Technology & Engineering
Languages : en
Pages : 626
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Book Description
Perovskite-based ceramics are a significant class of innovative materials with fascinating physical properties, which are now receiving intensive research attention in condensed matter physics and in the area of practical device applications. Perovskite Ceramics provides a state-of-the-art review on the latest advances in perovskite-based ceramic materials, as well as the development of devices from these materials for different applications. Perovskite Ceramics: Recent Advances and Emerging Applications is divided into two main parts. The first part focuses on the basics of perovskite-based ceramic materials and includes chapters on the fundamentals, synthesis and processing, characterization, and properties of these materials. Chapters are also included on bulk and thin materials, phase transitions, polaronic effects and the compensation and screening of ferroelectricity. This section will allow the reader to familiarize themselves with the standard traditional approach, but it will also introduce new concepts that are fast evolving in this field. The second part presents an extensive review of up-to-date research on new and innovative advances in perovskite-based ceramic materials. Chapters cover multiferroic applications, lead-free perovskites, energy storage applications, perovskite-based memories, light manipulation and spectral modifications, and solar cells and fuel cells. All these fields of research are rapidly evolving, so the book acts a platform to showcase latest results on optical strategies and materials for light manipulation, and spectral up- and down-conversion too (mainly rare earth doped oxides and complexes). The book will be an essential reference resource for academic and industrial researchers working in materials research and development particularly in functional and oxide ceramics and perovskites. - A comprehensive and systematic review of advanced research in perovskite-based ceramics - Covers both oxide and halide perovskites, their synthesis, processing, properties and applications - Presents advanced methods of synthesis as well as latest applications - Discusses all aspects from theory to production - Covers the most important advances both in terms of new materials and application strategies
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 956
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Book Description
Author:
Publisher:
ISBN:
Category : Ceramics
Languages : en
Pages : 500
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Book Description
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 486
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Book Description
Author: Rajat Banerjee
Publisher: Elsevier
ISBN: 0857093495
Category : Technology & Engineering
Languages : en
Pages : 617
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Book Description
Ceramic nanocomposites have been found to have improved hardness, strength, toughness and creep resistance compared to conventional ceramic matrix composites. Ceramic nanocomposites reviews the structure and properties of these nanocomposites as well as manufacturing and applications.Part one looks at the properties of different ceramic nanocomposites, including thermal shock resistance, flame retardancy, magnetic and optical properties as well as failure mechanisms. Part two deals with the different types of ceramic nanocomposites, including the use of ceramic particles in metal matrix composites, carbon nanotube-reinforced glass-ceramic matrix composites, high temperature superconducting ceramic nanocomposites and ceramic particle nanofluids. Part three details the processing of nanocomposites, including the mechanochemical synthesis of metallic–ceramic composite powders, sintering of ultrafine and nanosized ceramic and metallic particles and the surface treatment of carbon nanotubes using plasma technology. Part four explores the applications of ceramic nanocomposites in such areas as energy production and the biomedical field.With its distinguished editors and international team of expert contributors, Ceramic nanocomposites is a technical guide for professionals requiring knowledge of ceramic nanocomposites, and will also offer a deeper understanding of the subject for researchers and engineers within any field dealing with these materials. - Reviews the structure and properties of ceramic nanocomposites as well as their manufacturing and applications - Examines properties of different ceramic nanocomposites, as well as failure mechanisms - Details the processing of nanocomposites and explores the applications of ceramic nanocomposites in areas such as energy production and the biomedical field
Author: Ram Gupta
Publisher: Elsevier
ISBN: 0323986293
Category : Technology & Engineering
Languages : en
Pages : 606
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Book Description
Advanced Flexible Ceramics: Design, Properties, Manufacturing, and Emerging Applications provides detailed information on the properties and applications of advanced flexible ceramics. Sections cover materials dependent flexible behavior, microstructure and phases, the operational life of ceramics, how flexible materials can influence smart behavior (shape memory and self-healing), and thermal, physical, mechanical, electrical and optical properties. Various processing routes such as powder metallurgy, both physical and chemical vapor deposition, sol-gel, 3D print, and roll-to-roll processing are also explained in detail. The later section of the book provides detailed coverage of emerging technological applications. Additional chapters cover cost-effectiveness and the global market and recycling and future challenges and perspectives. This will be an essential reference resource for academic and industrial researchers working in the fields of refractory linings, high-temperature equipment, shielding, and MEMS/NEMS. - Covers a new class of flexible ceramic materials for advanced technological applications - Discusses a broad range of topics, including characterization, synthesis, microstructure and properties - Provides advanced technological aspects such as applications, manufacturing processes, industrial assessments and economics
Author: Committee on Advanced Fibers for High-Temperature Ceramic Composites
Publisher: National Academies Press
ISBN: 0309569036
Category : Technology & Engineering
Languages : en
Pages : 112
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Book Description
High-temperature ceramic fibers are the key components of ceramic matrix composites (CMCs). Ceramic fiber properties (strength, temperature and creep resistance, for example)-along with the debonding characteristics of their coatings-determine the properties of CMCs. This report outlines the state of the art in high-temperature ceramic fibers and coatings, assesses fibers and coatings in terms of future needs, and recommends promising avenues of research. CMCs are also discussed in this report to provide a context for discussing high-temperature ceramic fibers and coatings.
