Download or read book OXYDATION THERMIQUE DES METAUX DANS LA VAPEUR D EAU CAS DU NICKEL ET DU TITANE written by YVES.. WOUTERS and published by . This book was released on 1996 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES CINETIQUES D'OXYDATION A HAUTE TEMPERATURE DE NOMBREUX METAUX ET ALLIAGES METALLIQUES, AINSI QUE LA MORPHOLOGIE DES COUCHES DE CORROSION FORMEES, PEUVENT ETRE TRES INFLUENCEES PAR LA PRESENCE DE VAPEUR D'EAU DANS L'ATMOSPHERE OXYDANTE. CEPENDANT L'INTERPRETATION DES RESULTATS EST LA PLUPART DU TEMPS VAGUE ET LES MECANISMES D'OXYDATION RESTENT MAL CONNUS. POUR PORTER UN ECLAIRAGE NOUVEAU SUR CE DOMAINE DE LA CINETIQUE HETEROGENE, CETTE THESE TENTE DE RELIER LES ASPECTS CLASSIQUES DE MODELISATION MACROSCOPIQUE DE L'OXYDATION THERMIQUE DES METAUX ET CEUX, PLUS NOVATEURS, DE PERCEPTION MICROSCOPIQUE DES PHENOMENES PHYSIQUES IMPLIQUES. POUR CE FAIRE, NOUS AVONS MENE UNE ETUDE CINETIQUE PARAMETRIQUE ET UNE CARACTERISATION DES COUCHES UTILISANT NOTAMMENT LES METHODES PHOTO-ELECTROCHIMIQUES EX-SITU, DANS LE CAS DU NICKEL ET DU TITANE. POUR LA PREMIERE FOIS, L'UTILISATION SYSTEMATIQUE DE LA PHOTO-ELECTROCHIMIE, APPORTE DES ECLAIRAGES INATTENDUS SUR LES ECARTS A LA STOECHIOMETRIE, LE NIVEAU DE CONTRAINTE ET LA NATURE DES DEFAUTS DES OXYDES FORMES. CES RESULTATS PERMETTENT DE PROPOSER UNE MODELISATION CINETIQUE EN ACCORD AVEC LA TOTALITE DES OBSERVATIONS EXPERIMENTALES

Download or read book Influence de la vapeur d eau sur l oxydation haute temp rature des m taux written by Marie-Rose De Nicola and published by . This book was released on 1993 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: BIEN QUE L'ON SACHE DEPUIS LONGTEMPS QUE DES TRACES DE VAPEUR D'EAU PEUVENT MODIFIER LARGEMENT LA CINETIQUE D'OXYDATION DES METAUX, TRES PEU D'ETUDES SYSTEMATIQUES ONT ETE EFFECTUEES. NOUS EXAMINONS DANS CE TRAVAIL LES CAS DU TANTALE, DU TITANE ET DU NICKEL. CES TROIS METAUX ONT ETE CHOISIS PARCE QU'ILS REPRESENTENT ASSEZ BIEN LES DIFFERENTS TYPES DE LOIS CINETIQUES. POUR CHAQUE METAL, UNE ETUDE COMPARATIVE DE L'OXYDATION PAR L'OXYGENE, PAR LA VAPEUR D'EAU ET PAR DES MELANGES OXYGENE-VAPEUR D'EAU A ETE EFFECTUEE. PARALLELEMENT A L'ETUDE CINETIQUE, LES PRODUITS DE REACTION ONT ETE CARACTERISES PAR DIFFERENTES TECHNIQUES. IL APPARAIT QUE LES METAUX CHOISIS A PRIORI, COUVRENT BIEN LES DEUX GRANDS MODES D'INTERVENTION DE LA VAPEUR D'EAU SUR L'OXYDATION: SOIT PAR UNE ACTION SE MANIFESTANT PAR UNE INHIBITION CINETIQUE. C'EST CE QUI A ETE OBSERVE DANS LE CAS DU TANTALE OU L'OXYDE FORME NE SEMBLE PAS ETRE MODIFIE PAR LA PRESENCE DE VAPEUR D'EAU; SOIT PAR UNE ACTION INDUITE SUR LES PROPRIETES DE TRANSPORT DE L'OXYDE FORME, QUI PEUT SE TRADUIRE PAR UNE INHIBITION OU UNE EXACERBATION CINETIQUE. C'EST CE QUI A ETE OBSERVE DANS LE CAS DU TITANE. DES MODIFICATIONS MORPHOLOGIQUES DE LA COUCHE D'OXYDE SONT ALORS MISES EN EVIDENCE. POUR LE NICKEL, LES DEUX TYPES D'ACTION PEUVENT ETRE ENVISAGES

Download or read book Proceedings of the 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems Water Reactors written by Gabriell Ilevbare and published by Springer. This book was released on 2017-07-17 with total page 2354 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 15th Edition of the International Conference on Materials Degradation in Light Water Reactors focuses on subject areas critical to the safe and efficient running of nuclear reactor systems through the exchange and discussion of reseach results as well as field operating and management experience.

Download or read book Approche des m canismes d oxydation thermique par l mission acoustique written by Minh-Thi Tran and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'oxydation thermique est souvent étudiée par les méthodes classiques : mesure thermogravimétrie et observations MEB. L'utilisation de l'EA n'a pas encore été largement développée dans le domaine de l'oxydation thermique. Le présent travail vise à utiliser l'EA pour suivre in-situ l'oxydation et détecter les phénomènes physiques se produisant à haute température. Il porte sur deux groupes de matériaux : sensibles à l'oxydation catastrophique (Ti, Zy-4) et passifs (Cr, Ni). Ce travail présente tout d'abord l'oxydation du Ti pur à 900°C sous 150 mbar d'O2, en tant que matériau modèle. Il aborde également l'influence de la température, de l'atmosphère et de l'état de surface sur le comportement d'EA. L'oxydation du Zy-4, du Cr pur et du Ni pur sous oxygène et/ou sous vapeur d'eau est ensuite étudiée. Les ondes élastiques issues de l'oxydation sont converties en signaux d'EA via un capteur, lequel est collé au côté froid d'un guide d'onde en alumine. Une corrélation entre les mesures d'EA et les résultats classiques a été mise en évidence. La technique d'EA est capable de détecter l'oxydation catastrophique et d'identifier le mode de rupture de l'oxyde. Au-delà des paramètres discriminants d'EA, nous observons deux populations distinctes : la population dite normale est attribuée au bruit de fond et aux relaxations des contraintes dans l'oxyde associées à des phénomènes de fluage micro-mécanique, probablement situé aux joints de grains. La vitesse d'EA peut alors dépendre du niveau de ces contraintes et/ou de leurs relaxations. La population post-transitoire est associée à l'endommagement de l'oxyde conduisant à l'oxydation catastrophique. Selon le niveau d'énergie de transition, le mode de rupture de l'oxyde pourra être identifié. En revanche, l'EA n'a pas donné de résultats probants sur les matériaux passifs. Des signaux enregistrés ont pour principale origine le bruit de fond.

Download or read book La Tribune du CEBEDEAU written by and published by . This book was released on 1982 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Etudes Et Documentation Metallurgiques written by and published by . This book was released on 1955 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book A German English Dictionary for Chemists written by Austin M 1876-1956 Patterson and published by Scholar Select. This book was released on 2015-08-08 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Download or read book Analytical Methods in the Nuclear Fuel Cycle written by and published by . This book was released on 1972 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Uranium Ore Processing and Recovery from Non conventional Resources written by International Atomic Energy Agency and published by Agency. This book was released on 1985 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ultra High Temperature Ceramics written by William G. Fahrenholtz and published by John Wiley & Sons. This book was released on 2014-10-10 with total page 601 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book The Boundaries of the West African Craton written by Nasser Ennih and published by Geological Society of London. This book was released on 2008 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermodynamic Data for Mineral Technology written by L. B. Pankratz and published by . This book was released on 1984 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Ceramic Composites written by Narottam P. Bansal and published by Springer Science & Business Media. This book was released on 2006-08-25 with total page 547 pages. Available in PDF, EPUB and Kindle. Book excerpt: This valuable handbook has been compiled by internationally renowned researchers in the field. Each chapter is focused on a specific composite system or a class of composites, presenting a detailed description of processing, properties, and applications.

Download or read book Applied Mineralogy in the Mining Industry written by W. Petruk and published by Elsevier. This book was released on 2000-11-29 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: Techniques of performing applied mineralogy investigations, and applications and capabilities of recently developed instruments for measuring mineral properties are explored in this book intended for practicing applied mineralogists, students in mineralogy and metallurgy, and mineral processing engineers. The benefits of applied mineralogy are presented by using in-depth applied mineralogy studies on base metal ores, gold ores, porphyry copper ores, iron ores and industrial minerals as examples. The chapter on base metal ores includes a discussion on the effects of liberation, particle sizes and surfaces coatings of Pb, Cu, Fe, Ca and So4- on the recoveries of sphalerite, galena and chalcopyrite. The chapter on gold discusses various methods of determining the quantities of gold in different minerals, including 'invisible' gold in pyrite and arsenopyrite, so that a balance of the distribution of gold among the minerals can be calculated. This book also discusses the roles of pyrite, oxygen, moisture and bacterial (thiobacillus ferrooxidans) on reactions that produce acidic drainage from tailings piles, and summarizes currently used and proposed methods of remediation of acidic drainage.

Download or read book Dictionnaire des termes de m decine written by Henry Eugène de Méric and published by . This book was released on 1899 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Guide to Nuclear Power Cost Evaluation Equipment costs written by Kaiser Engineers and published by . This book was released on 1962 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: