Projection par plasma de dépôts de dioxyde de titane [microforme] : contribution à l'étude de leurs microstructures et propriétés électriques PDF Download

Author: Nadège Branland
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612867178
Category :
Languages : fr
Pages : 400

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Author: Nadège Branland
Publisher:
ISBN:
Category :
Languages : fr
Pages : 201

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L'objectif de ce travail de thèse est, à partir de la caractérisation des particules à l'impact (vitesse et température), d'essayer de comprendre l'influence des paramètres de projection plasma sur la microstructure des dépôts de dioxyde de titane et l'influence de cette dernière sur leur résistivité électrique, pour des conditions de substrat fixés. La stratégie expérimentale a consisté à utiliser deux procédés de projection plasma (plasma d'arc et plasma inductif) ce qui a permis d'obtenir une gamme étendue de vitesses et températures des particules conduisant à des dépôts avec des microstructures spécifiques. Malgré la stoechiométrie de la poudre de départ, tous les dépôts obtenus sont sous-stoechiométriques, la perte d'oxygène étant favorisée par l'augmentation de la température des particules à l'impact. En isolant l'influence de la stoechiométrie, il a été montré que la résistivité électrique des dépôts est surtout due à la diminution du nombre de mauvais contacts interlamellaires.

Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 692

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Author: Bénédicte Haller-Chastagnier
Publisher:
ISBN:
Category :
Languages : fr
Pages : 123

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Les propriétés physico-chimiques de la plupart des matériaux céramiques rendent difficile l'obtention de dépôts par projection plasma. Ce travail propose un procédé d'obtention de dépôts combinant projection plasma et réaction auto-entretenue (SHS) : nous nous proposons d'introduire dans les particules projetées une source de chaleur via réaction fortement exothermique (SHS) entre deux matériaux, le titane et le graphite dans notre cas. La première partie de ce travail a consisté à mettre au point des granulés plus ou moins cohésifs contenant du titane et du graphite en proportions stoechiométriques. Des dépôts ont ensuite été réalisés avec chaque type de granulés. La projection plasma de granulés peu cohésifs conduit à la formation d'un oxycarbure de titane de composition TiO0,81C0,04 alors que la projection plasma de granulés cohésifs conduit à des dépôts constitués de carbure de titane, de l'oxycarbure TiO0,81C0,04, d'oxycarbures de compositions très différentes et d'oxydes de titane. Enfin, des analyses thermodynamiques des systèmes ont été réalisées afin de proposer des mécanismes de formation de chacune des phases observées.

Author: Canadian Intellectual Property Office. Patent Office
Publisher:
ISBN:
Category : Copyright
Languages : un
Pages : 1220

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Author: Donald L. Smith
Publisher: McGraw Hill Professional
ISBN: 9780070585027
Category : Technology & Engineering
Languages : en
Pages : 648

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Publisher's Note: Products purchased from Third Party sellers are not guaranteed by the publisher for quality, authenticity, or access to any online entitlements included with the product.

Author: P. Misaelides
Publisher: Springer Science & Business Media
ISBN: 9780792333241
Category : Science
Languages : en
Pages : 702

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The development of advanced materials with preselected properties is one of the main goals of materials research. Of especial interest are electronics, high-temperature and superhard materials for various applications, as well as alloys with improved wear, corrosion and mechanical resistance properties. The technical challenge connected with the production of these materials is not only associated with the development of new specialised preparation techniques but also with quality control. The energetic charged particle, electron and photon beams offer the possibility of modifying the properties of the near-surface regions of materials without seriously affecting their bulk, and provide unique analytical tools for testing their quality. Application of Particle and Laser Beams in Materials Technology provides an overview of this rapidly expanding field. Fundamental aspects concerning the interactions and collisions on atomic, nuclear and solid state scale are presented in a didactic way, along with the application of a variety of techniques for the solution of problems ranging from the development of electronics materials to corrosion research and from archaeometry to environmental protection. The book is divided into six thematic units: Fundamentals, Surface Analysis Techniques, Laser Beams in Materials Technology, Accelerator-Based Techniques in Materials Technology, Materials Modification and Synchrotron Radiation.

Author: Sanjeevi Rajagopal
Publisher: Springer Science & Business Media
ISBN: 1461416973
Category : Technology & Engineering
Languages : en
Pages : 491

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The use of water for industrial purposes is of foremost importance. It is used as a coolant and industrial activities dealing with power generation, steel and iron, paper and pulp and oil require very large amounts of water. The industry, therefore, resorts to large scale abstraction of water from natural water bodies. This water is often treated with chemicals to combat operational problems like biofouling and corrosion. Such withdrawal and subsequent discharge of large amounts of water have the potential to impart significant impact on the recipient water body. The organisms drawn along with the cooling water, as well as those residing at the discharge zone, are subjected to a combination of mechanical, thermal and chemical stress on a continuous basis.

Author: Christine Vauthier
Publisher: Springer
ISBN: 3319414216
Category : Medical
Languages : en
Pages : 649

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This volume serves as a valuable handbook for the development of nanomedicines made of polymer nanoparticles because it provides researchers, students, and entrepreneurs with all the material necessary to begin their own projects in this field. Readers will find protocols to prepare polymer nanoparticles using different methods, since these are based on the variety of experiences that experts encounter in the field. In addition, complex topics such as, the optimal characterization of polymer nanoparticles is discussed, as well as practical guidelines on how to formulate polymer nanoparticles into nanomedicines, and how to modify the properties of nanoparticles to give them the different functionalities required to become an efficient nanomedicine for different clinical applications. The book also discusses the translation of technology from research to practice, considering aspects related to industrialization of preparation and aspects of regulatory and clinical development.

Author: A. Schoutens
Publisher:
ISBN: 9781461528395
Category :
Languages : en
Pages : 398

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