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Author: Thi Lan Huong Pham
Publisher:
ISBN:
Category :
Languages : fr
Pages : 374
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Author: Thi Lan Huong Pham
Publisher:
ISBN:
Category :
Languages : fr
Pages : 374
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Author: Casan Anderson
Publisher:
ISBN: 9781632384577
Category : Tungsten carbide
Languages : en
Pages : 0
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Book Description
Tungsten carbide is an extremely hard grey compound created by reaction of tungsten and carbon at high temperatures. This book encompasses elementary and valuable data on tungsten carbide. It covers topics ranging from powder processing to machining sciences with the purpose of facilitating the industry in discovering more possible applications. Tungsten carbide has drawn the attention of engineers as well as academics due to its distinguished properties like hardness and wear-resistance, chemical inertness and high melting point. It has several applications across distinct fields like oil and gas, wear parts, aerospace, mold and die, semiconductors, marine technology, cutting and mining tools, automotive, etc. It holds great potential specifically because of its quality to resist extreme temperature conditions and exceptionally hard nature.
Author: Alexey S. Kurlov
Publisher: Springer
ISBN: 9783319005256
Category : Technology & Engineering
Languages : en
Pages : 242
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This book embraces the entire range of problems associated with phase equilibria in “tungsten – carbon” binary system and related ternary systems, nonstoichiometry, disorder and order in different tungsten carbides, electronic and crystal structure of these carbides. The main application of tungsten carbides is constituent in hardmetals for cutting tools. In the last 20 years, the most active efforts were made in synthesis and application of nanocrystalline tungsten carbide for the production of nanostructured hardmetals. The present book describes in detail different methods for production of nanocrystalline tungsten carbide. The peculiarities of sintering of Co hardmetals from nanocrystalline powders having different particle sizes are discussed. Materials scientists using tungsten carbide to create novel superhard and tough materials will find this book particularly useful.
Author: VALERIE.. KELLER
Publisher:
ISBN:
Category :
Languages : fr
Pages : 247
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Book Description
LE BUT DE CETTE THESE EST L'ETUDE DES CARBURES DE TUNGSTENES MASSIQUES COMME SUBSTITUTS POSSIBLES DES METAUX DE LA MINE DU PLATINE (PT, PD, IR, RH,...). UN DES RESULTATS LES PLUS REMARQUABLES EST L'INFLUENCE DE LA NATURE ET DE LA QUANTITE D'OXYGENE SUR L'ACTIVITE CATALYTIQUE DE CES MATERIAUX. EN EFFET, L'AJOUT DE QUANTITES MEME TRES FAIBLES D'OXYGENE PROVOQUE UN CHANGEMENT RADICAL DES PROPRIETES CATALYTIQUES DU CARBURE DE TUNGSTENE. CETTE VARIATION SE POURSUIVANT AU FUR ET A MESURE QUE L'ON AJOUTE DE L'OXYGENE, A CONDITION DE NE PAS ALLER JUSQU'AUX OXYDES. LE FAIT D'AJOUTER DE L'OXYGENE A DIFFERENTES TEMPERATURES ET POUR PLUSIEURS TEMPS D'EXPOSITION, NOUS A PERMIS DE METTRE EN EVIDENCE DIVERS TYPES D'OXYGENE RESPONSABLES DE MECANISMES REACTIONNELS DIFFERENTS. CES MECANISMES DE REACTION ONT EGALEMENT ETE ETUDIES PAR TRACAGE ISOTOPIQUE AU CARBONE 13. NOUS AVONS AINSI PU DETERMINER TROIS COMPORTEMENTS CATALYTIQUES: 1) UN CARACTERE PUREMENT METALLIQUE, COMPARABLE AUX METAUX CRAQUANTS TELS QUE LE RUTHENIUM, LE NICKEL OU LE RHODIUM, SUR CARBURES DE TUNGSTENE SANS OXYGENE; 2) UN CARACTERE BIFONCTIONNEL POUR DES CARBURES DE TUNGSTENE MODIFIES PAR DE L'OXYGENE CHIMISORBE, 3) UN CARACTERE PSEUDO-METALLIQUE SUR DES CARBURES DE TUNGSTENE MODIFIES PAR L'OXYGENE A HAUTE TEMPERATURE (700C). NOUS SUPPOSONS, DANS CE CAS, AVOIR INCORPORATION DE L'OXYGENE DANS LE RESEAU FORMANT UN OXYCARBURE
Author: David López Munuera
Publisher:
ISBN:
Category :
Languages : fr
Pages : 51
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Author: Salil Kumar Jha
Publisher:
ISBN:
Category :
Languages : en
Pages : 118
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Author: Thierry Radet
Publisher: Cetim
ISBN: 9782854006254
Category :
Languages : fr
Pages : 18
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Book Description
L'utilisation des plaquettes en carbure apporte des solutions économiquement intéressantes pour certains outils et machines agricoles, mais les fabricants de machines agricoles sont confrontés à des dispersions importantes de qualité. Ces difficultés sont liées notamment à la qualité du brasage des plaquettes sur leur support. Afin de recenser les causes imputables au brasage des irrégularités de performance des outils de travail du sol au carbure, nous avons conduit une étude bibliographique (sous-traitée à l'Institut de soudure), qui a été complétée par des données issues d'ouvrages spécialisés, de brochures, ou de contacts avec différents acteurs industriels. Ceci a conduit à élaborer des recommandations mettant en lumière les particularités de l'opération de brasage du carbure de tungstène sur l'acier, ainsi que des conseils pratiques utiles aux constructeurs d'outils agricoles.
Author: R. Freer
Publisher: Springer Science & Business Media
ISBN: 9400921012
Category : Technology & Engineering
Languages : en
Pages : 716
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Book Description
Carbides, nitrides and borides are families of related refractory materials. Traditionally they have been employed in applications associated with engineering ceramics where either high temperature strength or stability is of primary importance. In recent years there has been a growing awareness of the interesting electrical, thermal and optical properties exhibited by these materials, and the fact that many can be prepared as monolithic ceramics, single crystals and thin films. In practical terms carbides, nitrides and borides offer the prospect of a new generation of semiconductor materials, for example, which can function at very high temperatures in severe environmental conditions. However, as yet, we have only a limited understanding of the detailed physics and chemistry of the materials and how the preparation techniques influence the properties. Under the auspices of the NATO Science Committee an Advanced Research Workshop (ARW) was held on the Physics and Chemistry of Carbides, Nitrides and Borides (University of Manchester, 18-22 September, 1989) in order to assess progress to date and identify the most promising themes and materials for future research. An international group of 38 scientists considered developments in 5 main areas: The preparation of powders, monolithic ceramics, single crystals and thin films; Phase transformations, microstructure, defect structure and mass transport; Materials stability; Theoretical studies; Electrical, thermal and optical properties of bulk materials and thin films.
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:
Publisher:
ISBN:
Category : Corrosion and anti-corrosives
Languages : en
Pages : 584
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