Transformation Toughening Of Composite Ceramics
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Transformation Toughening Of Composite Ceramics
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Author :
language : en
Publisher:
Release Date : 1990
Transformation Toughening Of Composite Ceramics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Research is underway into the application of martensitic transformations in ceramics to toughen a variety of ceramic-ceramic composites, i.e., to reduce their brittleness. The toughening agents of interest and their volume changes are dicalcium silicate (Ca2SiO4, 12%), nickel sulfide (NiS, 4%), lanthanide sesquioxides (Ln2O3, 8%) and lutentium borate (LuBO3, 8%). Ceramic processing routes have been developed to fabricate different types of toughened composites, viz., either by using a dispersed second phase microstructure or as a fine grained, single phase material. Specifically, Ca2SiO4 has been dispersed in CaZrO3 and the mechanical properties measured by bend tests. The critical importance of matrix toughness and grain size, as well as role of intergranular microcracking has been established. Dense pellets of fine grained, pure beta- Ca2SiO4 have been sintered and their transformability by grinding established. Their microstructures were examined by TEM and preliminary micromechanical studies made on it, and on Gd2O3, by indentation and SEM techniques. NiS inclusions in glass were examined by TEM and EDS and a sol gel processing route to precipitate NiS in glass has been identified. Composites of Dy2O3 in SiC and powders of LuBO3 in B2O3 have been fabricated.
Transformation Toughening Of Ceramics
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Author : David J. Green
language : en
Publisher: CRC Press
Release Date : 2018-02-06
Transformation Toughening Of Ceramics written by David J. Green and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-02-06 with Technology & Engineering categories.
The aim of this book is to provide a coherent and up-to-date discussion of the scientific work concerning the transformation toughening of ceramics. We hope the book is useful to scientists, engineers and students who are new to these materials. It is intended both as a source of learning and information to those who are new to these materials. It is intended both as a source of learning behaviour and microstructural relationships in transformation-toughened ceramics. While it has been our aim to present a book that is current as possible at the time of publication, the subject is still expanding in many areas; so our hope is that the reader will also gain an insight into the direction of future advances.
Tailoring Multiphase And Composite Ceramics
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Author : Richard E. Tressler
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Tailoring Multiphase And Composite Ceramics written by Richard E. Tressler and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
The proceedings of the Twenty-First University Conference on Ceramic Science held at The Pennsylvania State University, University Park, PA on July 17, 18 and 19, 1985 are compiled in this volume "Tailoring Multiphase and Composite Ceramics". This Conference emphasized the' discussion and analysis of the properties of multiphase ceramic materials in which the microstructure is deliberately tailored for specific applications or properties. Inter nationally recognized authorities presented keynote and invited lectures on topics dealing with processing and fabrication of multiphase and com posite electroceramics, fiber reinforced composites and high temperature multiphase ceramics. Results of recent research were presented in oral and poster sessions by leading researchers from several countries. This collection of papers represents the state of the art in our understand ing of the processing-structure-property interrelationships for these materials which possess unique and useful electrical, magnetic, optical, mechanical and thermal properties as a result of their multiphase nature. We are grateful for the financial support of the National Science Foundation, the Office of Naval Research, the Air Force Office of Scien tific Research, and the Defense Advanced Research Projects Agency for this conference. We gratefully acknowledge Prof. Robert Davis' leader ship role in steering and expanding this university conference series on ceramic science. We thank Ron Avillion and Linda Rose for their expert assistance in planning and coordinating the meeting. Thanks are due to Ms. Marian Reed, Ms. Judy Bell and Ms.
Microstructurally Developed Toughening Mechanisms In Ceramics Transformation Toughening In The A1 Sub 2 O Sub 3 Zro Sub 2 Composite System
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Author : F. F. Lange
language : en
Publisher:
Release Date : 1979
Microstructurally Developed Toughening Mechanisms In Ceramics Transformation Toughening In The A1 Sub 2 O Sub 3 Zro Sub 2 Composite System written by F. F. Lange and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
Three A1203/ZrO2 composites series, containing 0, 2, and 7.5 mole % Y203, respectively, were fabricated. For the A1203/ZrO2(+2M/oY203) series, tetragonal ZrO2 was retained from one end-member to the other. Significant increases in fracture toughness and strength were observed for materials in this system. Strengths decreased with increasing temperature. These results are consistent with previous theoretical predictions. (Author).
Transformation Toughening Of Ceramics
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Author :
language : en
Publisher:
Release Date : 1995
Transformation Toughening Of Ceramics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
This report summarizes the results from a 3-year research program aimed at developing a basic understanding of the microstructural design, fabrication, and properties of multilayered zirconia-based composites with high toughness and oxidation resistance. Most of the effort focused on multilayered composites of Ce-ZrO2 and Al2O3 which have strongly bonded interfaces. The design of the layered composite microstructure was based on micromechanics analysis: the layers modify the shape and extent of a crack tip transformation zone, leading to toughnesses over 20 MPa.m1/2. Optimum layer thicknesses were determined and related to effects of autocatalytic transformation and crack tip advance mechanisms. Crack resistance curves were measured at various temperatures: the very high toughnesses (> 10 MPa.m1/2) were limited to temperature range of approx. 100 deg C above the Ms temperature for the martensitic transformation. A preliminary study of multilayered composites containing weakly bonded layers (which achieve toughening by debonding) indicated that rare earth phosphates (LaPO4 and CePO4) are potentially suitable layers for Y- and Ce-stabilized zirconia composites. jg.
Mechanics Of Transformation Toughening And Related Topics
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Author : J.H. Andreasen
language : en
Publisher: Elsevier
Release Date : 1996-05-01
Mechanics Of Transformation Toughening And Related Topics written by J.H. Andreasen and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996-05-01 with Technology & Engineering categories.
Since the benefit of stress-induced tetragonal to monoclinic phase transformation of confined tetragonal zirconia particles was first recognized in 1975, the phenomenon has been widely studied and exploited in the development of a new class of materials known as transformation toughened ceramics (TTC). In all materials belonging to this class, the microstructure is so controlled that the tetragonal to monoclinic transformation is induced as a result of a high applied stress field rather than as a result of cooling the material below the martensitic start temperature. The significance of microstructure to the enhancement of thermomechanical properties of TTC is now well understood, as are the mechanisms that contribute beneficially to their fracture toughness. The micromechanics of these mechanisms have been extensively studied and are therefore presented here in a cogent manner. The authors also review dislocation formalism for the modelling of cracks and Eshelby's technique. In compiling this monograph the authors present the most up-to-date and complete review of the field and include several topics which have only recently been fully investigated.
The Shearing Contribution In Transformation Toughening Of Brittle Materials
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Author : P. Sofronis
language : en
Publisher:
Release Date : 1985
The Shearing Contribution In Transformation Toughening Of Brittle Materials written by P. Sofronis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
A simple constitutive law is proposed for the description of a ceramic composite which undergoes stress induced martensitic transformation. This law is used in finite element calculations to investigate the shear effect on the transformation zone near a crack tip. A formula describing the stress intensity factor change due to the shear contribution of the transformation is given. Significant loss of toughness is observed in the case of a stationary crack and is attributed entirely to the shear component of the transformation is given. Significant loss of toughness is observed in the case of a stationary crack and is attributed entirely to the shear component of the transformation. As the crack grows, the wake of the transformed material left behind the crack constitutes a source of toughening. This toughening is due to both dilatancy and shear in the phase change and rises to a maximum level just after a propagation comparable with the zone height. Finally, it is shown that the shear component can be important when prediction of the fracture toughness of the transformation toughened ceramics are made.
Advanced Structural Ceramics
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Author : Bikramjit Basu
language : en
Publisher: John Wiley & Sons
Release Date : 2011-10-11
Advanced Structural Ceramics written by Bikramjit Basu and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-10-11 with Technology & Engineering categories.
This book covers the area of advanced ceramic composites broadly, providing important introductory chapters to fundamentals, processing, and applications of advanced ceramic composites. Within each section, specific topics covered highlight the state of the art research within one of the above sections. The organization of the book is designed to provide easy understanding by students as well as professionals interested in advanced ceramic composites. The various sections discuss fundamentals of nature and characteristics of ceramics, processing of ceramics, processing and properties of toughened ceramics, high temperature ceramics, nanoceramics and nanoceramic composites, and bioceramics and biocomposites.
Designing With Structural Ceramics
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Author : R.W. Davidge
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Designing With Structural Ceramics written by R.W. Davidge and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
The last 30 years have seen a steady development in the range of ceramic materials with potential for high temperature engineering applications: in the 60s, self-bonded silicon carbide and reaction-bonded silicon nitride; in the 70s, improved aluminas, sintered silicon carbide and silicon nitrides (including sialons); in the 80s, various toughened Zr0 materials, ceramic matrix composites reinforced with silicon 2 carbide continuous fibres or whiskers. Design methodologies were evolved in the 70s, incorporating the principles of fracture mechanics and the statistical variation and time dependence of strength. These have been used successfully to predict the engineering behaviour of ceramics in the lower range of temperature. In spite of the above, and the underlying thermodynamic arguments for operations at higher temperatures, there has been a disappointing uptake of these materials in industry for high temperature usc. Most of the successful applications are for low to moderate temperatures such as seals and bearings, and metal cutting and shaping. The reasons have been very well documented and include: • Poor predictability and reliability at high temperature. • High costs relative to competing materials. • Variable reproducibility of manufacturing processes. • Lack of sufficiently sensitive non-destructive techniques. With this as background, a Europhysics Industrial Workshop sponsored by the European Physical Society (EPS) was organised by the Netherlands Energy Research Foundation (ECN) and the Institute for Advanced Materials of the Joint Research Centre (JRC) of the EC, at Petten, North Holland, in April 1990 to consider the status of thermomechanical applications of engineering ceramics.
2nd European Symposium On Engineering Ceramics
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Author : F.L. Riley
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
2nd European Symposium On Engineering Ceramics written by F.L. Riley and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
This volume contains the proceedings of the 2nd European Symposium on Engineering Ceramics held in London, 23-24 November 1987. The meeting was attended by almost 200 scientists and engineers, primarily drawn from industry, and the Sessions were chaired by Mr Eric Briscoe, past President of the Institute of Ceramics. Very effective symposium organisation was provided by IBC Technical Services Ltd. The engineering ceramics are a class of materials which has over some 50 years found well-established applications based on the materials' chemical stability and wear resistance. The last 20 years have seen intensified efforts to extend applications for these materials into areas traditionally occupied by metals, but in which the typical metallic weaknesses of wear, and of high temperature creep and oxidation, are now creating significant problems. These efforts have, however, in many cases been undermined on the one hand by the inherent ceramic weaknesses of brittleness and flaw sensitivity, and on the other by an inadequate understanding, and control, of the basic ceramic fabrication processes required for the low-cost mass production of relatively complex components. The positive results of the efforts of the last 20 years have been the development of a large new group of ceramic materials believed to possess intrinsic mechanical property advantages, of which the transformation toughened zirconias, and the ceramic matrix composites are good examples, together with improved powder production methods and powder shaping processes.