Grain Boundary Studies of Doped Yttria-stabilized Zirconia PDF Download
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Author:
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ISBN:
Category :
Languages : en
Pages : 4
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Book Description
Achieving superplasticity in fine-grained ceramics is a potential method to lower energy costs associated with ceramic manufacturing via net shape forming. Superplasticity is intrinsic in 3-mol%-yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP), and can be enhanced by addition of glass to form intergranular phases which are thought to both limit grain growth and promote grain boundary sliding. However, superplasticity has not been observed in 8-mol%-yttria-stabilized cubic zirconia (8Y-CSZ), ostensibly due to its larger grain size and high grain growth rates. As part of a larger study, high-spatial-resolution energy-dispersive X-ray spectrometry (EDS) has been performed to characterize intergranular compositions of 3Y-TZP and 8Y-CSZ doped with various glassy phases.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
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Book Description
Achieving superplasticity in fine-grained ceramics is a potential method to lower energy costs associated with ceramic manufacturing via net shape forming. Superplasticity is intrinsic in 3-mol%-yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP), and can be enhanced by addition of glass to form intergranular phases which are thought to both limit grain growth and promote grain boundary sliding. However, superplasticity has not been observed in 8-mol%-yttria-stabilized cubic zirconia (8Y-CSZ), ostensibly due to its larger grain size and high grain growth rates. As part of a larger study, high-spatial-resolution energy-dispersive X-ray spectrometry (EDS) has been performed to characterize intergranular compositions of 3Y-TZP and 8Y-CSZ doped with various glassy phases.
Author: Hui Li
Publisher:
ISBN: 9780438629882
Category :
Languages : en
Pages :
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Book Description
Nanocrystalline materials have been attracting wide attention because of their advanced technological application owing to their superior properties such as enhanced mechanical strength and ionic conductivity. The intrinsic presence of excess interfacial areas in nanomaterials causes their properties and functionalities to be strongly dependent on interfacial properties. From a thermodynamics perspective, this suggests both crystallographic stability and microstructural evolution are largely affected by interfacial energies, implying those energies can be used for microstructural control. However, there is still a dearth of understanding on the relationships between interfacial energies and processes such as sintering and coarsening of nanocrystalline ceramics, in particular in what concerns the usage of ionic dopants as sintering aids working on the modification of interfacial energies rather than from the classical kinetic approach (dopants affecting mechanisms of sintering). In this dissertation, nanocrystalline ceramic yttria stabilized zirconia (YSZ) was used as a model system to concomitantly evaluate the quantitative effect of dopants on both kinetics and thermodynamics of densification in order to provide a more comprehensive picture to allow refined control of sintering evolution. Doped and pure YSZ nanoparticles were synthesized using co-precipitation method and used as the starting powders for sintering. By using sophisticated calorimetric approaches, the interfacial energies of the nanoparticles were quantified, while the kinetic analysis was carried out using Kissinger method applied with sintering experiment in differential scanning calorimetry (DSC) with different heating rates. Manganese and lanthanum were the studied dopants, selected based on potential for segregation to interfaces, which would hypothetically cause a more pronounced interfacial energy change. Remarkable decrease in both surface and grain boundary energies, as well as an increase in the calculated dihedral angles, was observed with increasing Mn concentration in YSZ. Mn also caused a decrease in activation energy of densification of this system that could achieve high densities at moderate temperatures albeit with massive grain growth. La-doping, on the other hand, whilst decreasing interfacial energies and increasing dihedral angles in a similar manner as Mn, did not affect the activation energy of the process. Inhibition of both densification and grain growth was observed, implying that the design of favorable thermodynamic states is a necessary but not sufficient condition for densification to take place. Utilizing similar methodologies, studies proceeded on magnesium aluminate spinel with manganese and titanium as dopants to test if the concepts developed for YSZ could be extended to other systems. The results from analyzing Mn-doped spinel were perfectly aligned with the conclusions from the YSZ studies, such that a favorable thermodynamics and kinetics helped improve densification of the spinel. However, Ti-doped spinel showed significant deviations from the predicted behavior, as it had favorable thermodynamic and kinetic conditions but high densification could not be obtained during sintering. This anomalous behavior was attributed to abnormal grain growth that hindered pore elimination due to likely an energetic anisotropy in the grain boundaries.
Author: M., Bannister
Publisher: CRC Press
ISBN: 1000940322
Category : Technology & Engineering
Languages : en
Pages : 881
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Book Description
This book is based on the Fifth International Conference that was held on 16-21 August, 1992 in Melbourne, Australia, in conjunction with AUSTCERAM 92. It demonstrates that the field of Zirconia ceramics remains one of scientific challenge and technical attraction.
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Publisher: ScholarlyEditions
ISBN: 1464963312
Category : Technology & Engineering
Languages : en
Pages : 7150
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Book Description
Issues in Materials and Manufacturing Research: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Materials and Manufacturing Research. The editors have built Issues in Materials and Manufacturing Research: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Materials and Manufacturing Research in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Materials and Manufacturing Research: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Author: Mary Elizabeth Trahanovsky
Publisher:
ISBN:
Category :
Languages : en
Pages : 388
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Book Description
Author: M., Bannister
Publisher: CRC Press
ISBN: 9781566760737
Category : Technology & Engineering
Languages : en
Pages : 890
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Book Description
Zirconia V drew 122 contributions from 19 countries. The papers provide an up-to-date picture of zirconia research and development around the world. There is still considerable interest in the theory and practice of transformation toughening together with the application of zirconia toughening to increasingly more complex composite systems. They also reflect a prominent development of recent years, the resurgence of international interst in the zirconia-based solid oxide fuel cell.
Author: Adrian Baddeley
Publisher: CRC Press
ISBN: 1135438366
Category : Mathematics
Languages : en
Pages : 412
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Book Description
Setting out the principles of stereology from a statistical viewpoint, this book focuses on both basic theory and practical implications. The authors discuss ways to effectively communicate statistical issues to clients, draw attention to common methodological errors, and provide references to essential literature. The first full text on design-based stereology opens with a review of classical and modern stereology, followed by a treatment of mathematical foundations and then on to core techniques. The final chapters discuss implementing techniques in practical sampling designs, summarize understanding of the variance of stereological estimators, and describe open problems for further research. The book also details isotropic, vertical or local sampling designs for estimating stereological parameters such as volume, surface area, particle number and spatial distribution. This extensive text offers support to statistical consultants using examples, applications and unique Advice to Consultants sections. It contains numerous literature references, bibliographic notes and nearly 150 illustrations.
Author: S.C. Singhal
Publisher: Elsevier
ISBN: 0080508081
Category : Technology & Engineering
Languages : en
Pages : 423
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Book Description
High Temperature Solid Oxide Fuel Cells: Fundamentals, Design and Applications provides a comprehensive discussion of solid oxide fuel cells (SOFCs). SOFCs are the most efficient devices for the electrochemical conversion of chemical energy of hydrocarbon fuels into electricity, and have been gaining increasing attention for clean and efficient distributed power generation. The book explains the operating principle, cell component materials, cell and stack designs and fabrication processes, cell and stack performance, and applications of SOFCs. Individual chapters are written by internationally renowned authors in their respective fields, and the text is supplemented by a large number of references for further information. The book is primarily intended for use by researchers, engineers, and other technical people working in the field of SOFCs. Even though the technology is advancing at a very rapid pace, the information contained in most of the chapters is fundamental enough for the book to be useful even as a text for SOFC technology at the graduate level.
Author: James F. Shackelford
Publisher: Springer Science & Business Media
ISBN: 0387733620
Category : Technology & Engineering
Languages : en
Pages : 209
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Book Description
This is a concise, up-to-date book that covers a wide range of important ceramic materials used in modern technology. Chapters provide essential information on the nature of these key ceramic raw materials including their structure, properties, processing methods and applications in engineering and technology. Treatment is provided on materials such as alumina, aluminates, Andalusite, kyanite, and sillimanite. The chapter authors are leading experts in the field of ceramic materials. An ideal text for graduate students and practising engineers in ceramic engineering, metallurgy, and materials science and engineering.
Author: Ralf Riedel
Publisher: John Wiley & Sons
ISBN: 9783527311552
Category : Technology & Engineering
Languages : en
Pages : 624
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Book Description
Although ceramics have been known to mankind literally for millennia, research has never ceased. Apart from the classic uses as a bulk material in pottery, construction, and decoration, the latter half of the twentieth century saw an explosive growth of application fields, such as electrical and thermal insulators, wear-resistant bearings, surface coatings, lightweight armour, or aerospace materials. In addition to plain, hard solids, modern ceramics come in many new guises such as fabrics, ultrathin films, microstructures and hybrid composites. Built on the solid foundations laid down by the 20-volume series Materials Science and Technology, Ceramics Science and Technology picks out this exciting material class and illuminates it from all sides. Materials scientists, engineers, chemists, biochemists, physicists and medical researchers alike will find this work a treasure trove for a wide range of ceramics knowledge from theory and fundamentals to practical approaches and problem solutions.
