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Languages : en
Pages : 34
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The processing, properties, and performance of zirconium diboride-ceramics were studied. The initial phase of the work focused on improving the properties of zirconium diboride silicon carbide ceramics prepared from commercial powders by minimizing the-impurity content and controlling the grain size of ceramics prepared by conventional hot pressing. Strengths of more than 1000 MPa (1 GPa) were measured for zirconium diboride containing 20 or-30 volume percent silicon carbide, much higher than previous reports. Another aspect of the work focused on controlling the meso-scale architecture of zirconium diboride based ceramics using co-extrusion processing. The resulting fibrous monolithic-ceramics demonstrated non-catastrophic failure behavior. As part of this research, a pressureless sintering process was developed whereby zirconium diboride could be sintered to near theoretical density without applied pressure or liquid phase sintering aids. Development of the sintering process continues under follow-on funding through the Air Force Research Laboratory. The oxidation behavior of zirconium diboride ceramics was-examined in static oxidation testing and arc jet testing. Finally, reactive processes were developed to produce zirconium diboride and zirconium diboride-silicon carbide ceramics.
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Category :
Languages : en
Pages : 34
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Book Description
The processing, properties, and performance of zirconium diboride-ceramics were studied. The initial phase of the work focused on improving the properties of zirconium diboride silicon carbide ceramics prepared from commercial powders by minimizing the-impurity content and controlling the grain size of ceramics prepared by conventional hot pressing. Strengths of more than 1000 MPa (1 GPa) were measured for zirconium diboride containing 20 or-30 volume percent silicon carbide, much higher than previous reports. Another aspect of the work focused on controlling the meso-scale architecture of zirconium diboride based ceramics using co-extrusion processing. The resulting fibrous monolithic-ceramics demonstrated non-catastrophic failure behavior. As part of this research, a pressureless sintering process was developed whereby zirconium diboride could be sintered to near theoretical density without applied pressure or liquid phase sintering aids. Development of the sintering process continues under follow-on funding through the Air Force Research Laboratory. The oxidation behavior of zirconium diboride ceramics was-examined in static oxidation testing and arc jet testing. Finally, reactive processes were developed to produce zirconium diboride and zirconium diboride-silicon carbide ceramics.
Author: Mrityunjay Singh
Publisher: John Wiley & Sons
ISBN: 1119407281
Category : Technology & Engineering
Languages : en
Pages : 693
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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: Dipankar Ghosh
Publisher: Elsevier Inc. Chapters
ISBN: 0128057165
Category : Technology & Engineering
Languages : en
Pages : 75
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Category :
Languages : en
Pages :
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Zirconium- and titanium- based compounds (borides, carbides and nitrides) are of importance because of their attractive properties including: high melting temperature, high-temperature strength, high hardness, high elastic modulus and good wear-erosion-corrosion resistance. The ultra high temperature ceramics (UHTCs) - zirconium diboride (ZrB2) and zirconium carbide (ZrC) in combination with SiC are potential candidates for ultra-high temperature applications such as nose cones for re-entry vehicles and thermal protection systems, where temperature exceeds 2000°C. Titanium nitride (TiN) and titanium diboride (TiB2) composites have been considered for cutting tools, wear resistant parts etc. There are problems in the processing of these materials, as very high temperatures are required to produce dense composites. This problem can be overcome by the development of composites through reactive hot processing (RHP). In RHP, the composites are simultaneously synthesized and densified by application of pressure and temperatures that are relatively low compared to the melting points of individual components. There have been earlier studies on the fabrication of dense ZrB2-ZrC, ZrB2-SiC and TiN-TiB2 composites by the following methods: Pressureless sintering of preformed powders at high temperatures (1800-2300°C) with MoSi2, Ni, Cr, Fe additions Hot pressing of preformed powders at high temperatures (1700-2000°C) with additives like Ni, Si3N4, TiSi2, TaSi2, TaC Melt infiltration of Zr/Ti into B4C preform at 1800-1900°C to produce ZrB2-ZrC-Zr and TiB2-TiC composites RHP of Zr-B4C, Zr-Si-B4C and Ti-BN powder mixtures to produce ZrB2-ZrC, ZrB2-SiC and TiN-TiB2 powder mixtures at 1650-1900°C Spark plasma sintering of powder mixtures at 1800-2100°C There has been a lack of attention paid to the conditions under which ceramic composites can be produced by simple hot pressing (~50 MPa) with minimum amount of additives, which will not affect the mechanical properties of the composi.
Author: William G. Fahrenholtz
Publisher: Wiley-American Ceramic Society
ISBN: 9781118700785
Category : Technology & Engineering
Languages : en
Pages : 0
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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: Narottam P. Bansal
Publisher: John Wiley & Sons
ISBN: 0470522178
Category : Technology & Engineering
Languages : en
Pages : 268
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Book Description
A valuable reference for those interested in innovative approaches to the synthesis and processing of ceramics and composites, as well as their properties. Twenty-two papers describing the latest developments in the areas of combustion synthesis, microwave processing, reaction forming, polymer processing, chemical vapor deposition, electrophoresis, spark plasma sintering, mechanical amorphization, thin films, composites, and more are included in this volume.
Author: It-Meng Low
Publisher: Engineering Science Reference
ISBN: 9781466640665
Category : Ceramic-matrix composites
Languages : en
Pages : 0
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Book Description
"This book investigates a new class of ultra-durable ceramic materials, which exhibit characteristics of both ceramics and metals, and 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"--
Author: Tatsuki Ohji
Publisher: John Wiley & Sons
ISBN: 9780470456217
Category : Technology & Engineering
Languages : en
Pages : 249
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Book Description
This volume provides a one-stop resource, compiling current research on advanced processing and manufacturing technologies for structural and multifunctional materials. It is a collection of papers from The American Ceramic Society s 32nd International Conference on Advanced Ceramics and Composites, January 27-February 1, 2008. Topics include advanced processing and manufacturing technologies for a wide variety of non-oxide and oxide based structural ceramics, ultra-high temperature ceramics and composites, particulate and fiber reinforced composites, and multifunctional materials. This is a valuable, up-to-date resource for researchers in the field.
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Languages : en
Pages : 116
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Book Description
The US Air Force is interested in developing fiber-reinforced ceramic composites that perform at ultra-high temperatures (greater or more than 1500 degrees C) under oxidative conditions, especially for hypersonic vehicles. Two potential approaches are: (a) Utilizing existing carbon-fiber-reinforced carbon-matrix composites (C/C) or carbon-fiber-reinforced silicon carbide-matrix composites (C/SiC) coated by thick (>100 um) ultra-high temperature ceramic (UHTC) coatings, or (b) Replacing the C and SiC matrices of such composites with an ultra-high temperature matrix, processed by conventional composite techniques. The most investigated UHTCs are ZrB2/SiC and HfB2/SiC particulate composites (70:30 to 80:20 volume ratio). Wet processing via slurries is potentially a practical method for making such thick coatings and matrices. The project focused on developing slurry processing for thick ZrB2/SiC coatings on SiC and, to a limited extent, C/SiC composite substrates using preceramic and precarbon polymers combined with inert fillers and/or reactive metals. The evolved coatings were tested for their oxidation resistance under various conditions. A limited effort to assess the capability of bulk compositions made of slurries suitable for processing matrices for fiber-reinforced composites was also performed. Out of two distinctly different approaches and various compositions and preceramic polymers, the most promising stepwise approach was determined to be (1) forming ZrB2/C porous coatings ("preforms") processed from phenolic-based slurries, then (2) reacting the preform coatings with molten Si to form SiC and (3) converting residual Si to SiC. This technique resulted in highly dense, well adhering composite coatings that were 100 um thick and over. Thick coatings made by this approach provided much better characteristics and performance than other formulations and processes.
Author: Tatsuki Ohji
Publisher: Wiley-American Ceramic Society
ISBN: 9780470344996
Category : Technology & Engineering
Languages : en
Pages : 236
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Book Description
This volume provides a one-stop resource, compiling current research on advanced processing and manufacturing technologies for structural and multifunctional materials. It is a collection of papers from The American Ceramic Society s 32nd International Conference on Advanced Ceramics and Composites, January 27-February 1, 2008. Topics include advanced processing and manufacturing technologies for a wide variety of non-oxide and oxide based structural ceramics, ultra-high temperature ceramics and composites, particulate and fiber reinforced composites, and multifunctional materials. This is a valuable, up-to-date resource for researchers in the field.
