Cinétique d'oxydation d'un composite carbone/carbone et influence sur le comportement mécanique PDF Download

Author: Emmanuel Duvivier
Publisher:
ISBN:
Category :
Languages : fr
Pages : 214

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Book Description
LA DUREE DE VIE DES COMPOSITES C/C EST CONDITIONNEE, DANS DE NOMBREUSES APPLICATIONS, PAR LA NATURE DE L'ENVIRONNEMENT OXYDANT RENCONTRE. LEUR OXYDATION A D'ABORD ETE CARACTERISEE SUR LE PLAN PHYSICO-CHIMIQUE EN FONCTION DES CONDITIONS D'OXYDATION (TEMPERATURE, HUMIDITE ET PRESENCE DE CATALYSEUR TEL QUE LE CARBONATE DE POTASSIUM). PUIS LES PERTES DE PROPRIETES MECANIQUES ONT ETE QUANTIFIEES ET CORRELEES AUX CONDITIONS D'OXYDATION. EN ABSENCE DE CATALYSEUR, LES CARACTERISTIQUES MECANIQUES CHUTENT DES LES PREMIERS POURCENTS D'OXYDATION SUITE A L'ATTAQUE PREFERENTIELLE DE LA ZONE INTERFACIALE FIBRE/MATRICE. LA PRESENCE DE K#2CO#3 ENTRAINE UNE AUGMENTATION DE LA VITESSE D'OXYDATION MAIS UNE CHUTE MOINDRE DES PROPRIETES MECANIQUES A ISO-TAUX D'OXYDATION SUITE A UNE OXYDATION LOCALISEE PLUS EN SURFACE. LA PRESENCE D'HUMIDITE NE FAIT QUE RENFORCER L'ACTION DU CATALYSEUR

Author: L. P. Cook
Publisher: Wiley-American Ceramic Society
ISBN:
Category : Science
Languages : en
Pages : 204

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Book Description
This book provides a state-of-the-art collection of recent papers on interfaces in heterogeneous ceramic systems presented at the 6th Pacific Rim Conference on Ceramic and Glass Technology (PacRim 6) in September of 2005 in Maui, Hawaii. The book is logically divided into 5 sections on interfaces, including theory and modeling, wetting phenomena, heterogeneous interfaces in high-temperature superconductors, bio-interfaces, and new developments in instrumentation that aid in the characterization of interfaces.

Author: Fabienne Rabillaud
Publisher:
ISBN:
Category :
Languages : fr
Pages : 248

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Book Description
Les fibres de carbone sont les constituants essentiels des matériaux composites C/C (renforts fibreux) et, bien qu'elles possèdent de remarquables propriétés mécaniques en milieux neutres ou réducteurs, elles sont très vulnérables aux milieux oxydants dès 500°C. L'étude porte sur un domaine de températures compris entre 800 et 1400°C. Les protections solides ne permettent pas de conserver intacts les matériaux carbones à ces températures en raison de contraintes mécaniques et thermiques (décohésion de l'interface carbone/solide conduisant à la perte d'efficacité de la couche protectrice). Les travaux envisagent des méthodes de protection gazeuse en milieu inerte (gaz rares et argon) et/ou halogènes (chlore) expérimentés sur la fibre de carbone haut-module. Les techniques expérimentales utilisées sont plus particulièrement la thermogravimétrie et l'analyse par spectrométrie de masse qui permettent de déterminer les cinétiques d'oxydation et la composition gazeuse du milieu réactionnel. La nature du gaz inerte influe sur la cinétique d'oxydation dans la mesure ou ces derniers créent une barrière de diffusion gazeuse autour du solide carbone. L'inhibition est de nature chimique pour les températures inférieures à 1000°C (création de complexes C/Cl) ; le facteur d'inhibition atteint à 800°C est de l'ordre de 40 et le phénomène présente une rémanence lorsque le débit chloré est stoppé. Aux températures supérieures, l'interaction C/Cl est moins efficace et elle est fragilisée par les chocs moléculaires entre la surface carbonée et les molécules gazeuses

Author: Wonbong Choi
Publisher: CRC Press
ISBN: 1439861889
Category : Science
Languages : en
Pages : 374

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Book Description
Since the late 20th century, graphene-a one-atom-thick planar sheet of sp2-bonded carbon atoms densely packed in a honeycomb crystal lattice-has garnered appreciable attention as a potential next-generation electronic material due to its exceptional properties. These properties include high current density, ballistic transport, chemical inertness,

Author: Don Montague
Publisher: Taylor & Francis
ISBN: 9780419199106
Category : Architecture
Languages : en
Pages : 472

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Book Description
This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

Author: Ahmed Belasri
Publisher: Springer Nature
ISBN: 9811554447
Category : Technology & Engineering
Languages : en
Pages : 659

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Book Description
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.

Author: Ellis L. Krinitzsky
Publisher:
ISBN:
Category : Gravel
Languages : en
Pages : 178

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Book Description

Author: Narottam P. Bansal
Publisher: John Wiley & Sons
ISBN: 1118832892
Category : Technology & Engineering
Languages : en
Pages : 725

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Book Description
This book is a comprehensive source of information on various aspects of ceramic matrix composites (CMC). It covers ceramic and carbon fibers; the fiber-matrix interface; processing, properties and industrial applications of various CMC systems; architecture, mechanical behavior at room and elevated temperatures, environmental effects and protective coatings, foreign object damage, modeling, life prediction, integration and joining. Each chapter in the book is written by specialists and internationally renowned researchers in the field. This book will provide state-of-the-art information on different aspects of CMCs. The book will be directed to researchers working in industry, academia, and national laboratories with interest and professional competence on CMCs. The book will also be useful to senior year and graduate students pursuing degrees in ceramic science and engineering, materials science and engineering, aeronautical, mechanical, and civil or aerospace engineering. Presents recent advances, new approaches and discusses new issues in the field, such as foreign object damage, life predictions, multiscale modeling based on probabilistic approaches, etc. Caters to the increasing interest in the application of ceramic matrix composites (CMC) materials in areas as diverse as aerospace, transport, energy, nuclear, and environment. CMCs are considered ans enabling technology for advanced aeropropulsion, space propulsion, space power, aerospace vehicles, space structures, as well as nuclear and chemical industries. Offers detailed descriptions of ceramic and carbon fibers; fiber-matrix interface; processing, properties and industrial applications of various CMC systems; architecture, mechanical behavior at room and elevated temperatures, environmental effects and protective coatings, foreign object damage, modeling, life prediction, integration/joining.

Author: Alfonso Jiménez
Publisher: Royal Society of Chemistry
ISBN: 1849738793
Category : Science
Languages : en
Pages : 374

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Book Description
A comprehensive overview of the synthesis, characterisation, properties and applications of poly(lactic acid) science and technology covering scientific, ecological, social and economic issues.

Author: Maren Roman
Publisher: OUP USA
ISBN: 9780841269651
Category : Science
Languages : en
Pages : 0

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Book Description
This book provides an overview of the different methods of model cellulosic surface preparation and presents recent studies on the properties of these surfaces. The topics covered are considered relatively new and would serve as the launch pad for further research in this area.