Transformation Toughening Of Ceramics

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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.

Transformation Toughening Of Ceramics

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Author : D. B. Marshall
language : en
Publisher:
Release Date : 1987

Transformation Toughening Of Ceramics written by D. B. Marshall and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.

The mechanical properties of high toughness magnesia partially stabilized zirconia were found to be severely degraded by a single cooling cycle between room temperature and 196 C. In-situ Raman spectroscopy and optical interference measurements, and room temperature x-ray diffraction were used to correlate the changes in mechanical properties with structural changes; cooling to temperatures below approximately -100C caused transformation of most of the tetragonal precipitates that are responsible for toughening to a new phase was stable with heating to 300 C, but at 400 C it transformed back to the tetragonal structure. After heating to 400 C the original high toughness mechanical properties were also restored. A new approach for measuring the nature and distribution of strains within transformation zones surrounding cracks in transformation toughened materials was demonstrated, using Mg-PSZ. The method involves measuring out-of-plane distortions adjacent to a surface-breaking crack and comparing the measurements with computed displacements. The fraction of transformation was found to be strongly varying function of distance from the crack plane.

A Micromechanical Approach To Transformation Toughening In Ceramics

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Author : Geert Stam
language : en
Publisher:
Release Date : 1994

A Micromechanical Approach To Transformation Toughening In Ceramics written by Geert Stam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.

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 Martensitic Transformation In Ceramics Its Role In Transformation Toughening

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Author : Patrick M. Kelly
language : en
Publisher:
Release Date : 2002

The Martensitic Transformation In Ceramics Its Role In Transformation Toughening written by Patrick M. Kelly and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Ceramic materials categories.

Transformation Toughening In Ceramics

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Author :
language : en
Publisher:
Release Date : 1980

Transformation Toughening In 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 1980 with categories.

The origin of transformation toughening in ceramics is examined using two separate approaches: one based on the stress field ahead of the crack and the other on the changes in thermodynamic potential during a crack increment. Both approaches yield essentially similar predictions of trends in toughness with particle size, temperature, composition, etc. The stress intensity analysis provides fully quantitative predictions of the toughness. These indicate that the shielding of the crack by the transformation zone only develops in the presence of a transformed wake, leading to R-curve behavior.

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.

Micromechanics And Transformation Toughening Of Ceramics

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Author : J. H. Andreasen
language : en
Publisher:
Release Date : 1992

Micromechanics And Transformation Toughening Of Ceramics written by J. H. Andreasen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.

Transformation Toughening Of Ceramics

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Author : Materials Information (Information service)
language : en
Publisher:
Release Date : 1987

Transformation Toughening Of Ceramics written by Materials Information (Information service) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Ceramic materials categories.

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.