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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 143 for “"Carbides"”.
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Modelling Precipitation of Carbides in Martensitic Steels
… developed for the precipitation of needle-shaped carbides, and a new model for plate-shaped carbides. The models are then verified experimentally, using five steels designed specifically for this purpose. Using the chemical compositions of the steels and thermodynamic data, the carbide …
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Hydrogen Chemisorption and Oxidation on Transition Metal Carbides
Made available in DSpace on 2014-12-14T15:24:03Z (GMT). No. of bitstreams: 1 8004134.pdf: 3664469 bytes, checksum: 930bba133afa8c68baa82325bbb4f927 (MD5) Previous issue date: 1979
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Electron energy loss spectroscopy of transition-metal carbides
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T14:57:08Z No. of bitstreams: 1 1983_allison.pdf: 3824629 bytes, checksum: c0a995c7c2bcca1cad4a44e6d628a004 (MD5)
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Microstructural formations and phase transformation pathways in tantalum carbides
Transition metal carbides have a large assortment of applications because of their high hardness, chemical resistance, and high melting temperatures. Tantalum carbide (TaC) and its sub-stoichiometric Ta2C and Ta4C3 phases have emerged as candidate materials for ultra-high temperature structural …
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THE REACTIVITY OF SOME TRANSITION METAL NITRIDES AND CARBIDES
… and oxidation of transition metal nitrides and carbides is reviewed and the crystal structures and types of bonding are discussed. Types of nitrides and carbides are categorized in terms of physical and chemical properties and type of bonding. The principles of sintering are summarised. Tlie …
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One pot synthesis of metal, carbides and polymeric aerogels
… aerogels, refractory Cr, Ti, Hf oxides yield carbides. By casting a conformal polymer coating on the RF-MOx interpenetrating nanoparticle networks, or by controlling the drying process and thus the compactness of the network"--Abstract, page iv.</p>
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Microstructure and Microchemistry of Titanium-Carbide Coated Cemented Carbides
… microstructural analysis of TiC-coated cemented carbides has been performed using a variety of contemporary micro-analytical techniques: Auger Electron Spectroscopy, STEM X-ray microchemical analysis and electron energy loss spectroscopy. As most of the analytical technique
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Study of the properties of cemented carbides from industrial production
Cemented carbides are composite materials formed by high amount of WC bonded by a soft phase, usually Co. They are used in many applications, such as drawing dies, cutting tools and hot rolls due to theirs remarkable properties of high hardness and wear resistance. Mechanical properties are …
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Resistivity, Superconductivity, and Order-Disorder Transformations in Carbides and Carbohydrides
… electron transport in transition-metal carbides with special attention to ordering effects in substoichiometric carbides and to the influence of hydrogenation.
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Resistivity, Superconductivity, and Order-Disorder Transformations in Carbides and Carbohydrates
Submitted by Jesse Garrison (jagarris@illinois.edu) on 2011-06-08T17:25:26Z No. of bitstreams: 1 1981_dy.pdf: 2053914 bytes, checksum: 4f61aedb006514e90490992ec38e786e (MD5)
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Carbon formation on metal carbides in chlorine-containing gases at high temperature.
Carbon formation on metal carbides in chlorine-containing gases at high temperature.
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Laser surface treatment of materials with presence of carbides at the surface.
Some of the studies associated with laser assisted processing including machining, surface treatment applications, and electrochemical response of the selective surfaces were carried out prior to the thesis work by the thesis author. In the light of the previous studies, additional study on laser …
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Electronic structure and optical properties of layered ternary transition-metal carbides and nitrides
… method. These layered ternary transition-metal carbides and nitrides are also commonly referred to as "MAX phases". Trends were observed for the calculated density of states (DOS) at Fermi-level, with respect to elemental variations and number of M and X layers. A local minimum of DOS(Ef) was …
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NOVEL TYPES OF TWO-DIMENSIONAL METAL CARBIDES AND THEIR APPLICATIONS: FIRST PRINCIPLES STUDIES
… Following this strategy, two types of 2D metal carbides are theoretically designed. The family presents high stability and tunable electronic properties, indicating substantial potential for diverse applications. To substantiate this, the applications of designed 2D metal carbides in …
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Synthesis, characterization and chemistry of two-dimensional transition metal carbides and nitrides (MXenes)
… of two-dimensional (2D) early transition-metal carbides and nitrides first synthesized in 2011 from bulk layered crystalline MAX phases. Because of their 2D structure and unique combination of high conductivity and hydrophilicity, MXenes have raised a significant interest for various …
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Synthesis and characterization of transition metal nitrides and carbides for catalysis and electrochemistry application
It was the goal of this work to explore two different synthesis pathways using green chemistry. The first part of this thesis is focusing on the use of the urea-glass route towards single phase manganese nitride and manganese nitride/oxide nano-composites embedded in carbon, while the second part …
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First principles phase diagram calculations in group IV carbides and Mg2SiO4 liquid from Molecular Dynamics
Atomistic simulations on stability and physical properties of Earth materials are playing an increasingly important role in high pressure mineralogy. Such computations can provide guidance for experimental studies and insight into underlying causes of observations, or explore conditions and …
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Thermal conductivity and electrical resistivity of cemented carbides, titanium diboride and high temperature ceramic superconductors
… superconductors, cemented transition-metal carbides and Ti~~. These interactions were studied via measurement and analysis of thermal conductivity and electrical resistivity from 15-1400 oK. It has been reported that YB8:2CU:-sO-7--,.. exhibits a significant rise in thermal conductivity just …
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Determination of the linear thermal expansion coefficients of the refractory carbides by X-ray diffraction
Thesis: B.S., Massachusetts Institute of Technology, Department of Metallurgy, 1961
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