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Tesi sul tema "Carbides"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 25 luglio 2025

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1

Chrysanthou, Andreas. "Formation of some transition metal carbides." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/37972.

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2

Mao, Ou. "Formation and stability of Sm2Fe17 carbides." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=42089.

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Phase formation and transformation in mechanically alloyed iron-rich Sm-Fe-C is the principal subject of this thesis. Ternary Sm-Fe-C is a complicated system. The strategy was therefore to start with a binary system. A series of mechanically alloyed R$ sb2$Fe$ sb{17}$ powders were investigated for a better understanding of both the Sm-Fe alloy system in general and the Sm$ sb2$Fe$ sb{17}$ compound in particular. The objective was to learn (1) what is the steady-state in the mechanically alloyed R$ sb2$Fe$ sb{17},$ and (2) how the 2-17 structure is formed from the mechanically alloyed precursor
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3

Riaz, Shahid. "Titanium based composites containing particulate carbides." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264184.

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4

Gasparrini, Claudia. "Oxidation of zirconium and uranium carbides." Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/59006.

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Oxidation of uranium carbide (UC) was investigated because it is used as a preliminary treatment prior to storage and permanent disposal of carbide nuclear fuels. Working with UC present some challenges, mainly related to its radioactivity and pyrophoricity, therefore initial studies were conducted on zirconium carbide (ZrC) which is isostructural and exhibits similar chemistry to UC. High temperature environmental scanning electron microscopy (HT-ESEM) was used to examine in situ the oxidation of both ZrC and UC. Oxide products were subsequently analysed using macro to nano characterisation t
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5

Lindahl, Bonnie. "Equilibrium Study of Chromium Containing Cemented Carbides : Solubility of chromium in tungsten carbide and η-phase". Thesis, KTH, Materialvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-49974.

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This project treats the W-C-Co-Cr quaternary system at low carbon contents. The main goals with this project were to find a four phase equilibrium between WC, Co-binder phase, η-phase (M6C) and a fourth unknown phase, to discover which the fourth phase is and to establish whether or not WC dissolves any chromium. In order to answer these questions a number of alloys were prepared, the compositions were chosen using thermodynamic calculations and observations from previous alloys. The samples were prepared using a powder metallurgical route and they were sintered at 1410oC. The samples were pre
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6

Markström, Andreas. "Thermodynamic modelling of carbides in multicomponent systems." Licentiate thesis, KTH, Materials Science and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10013.

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<p>This thesis concerns thermodynamic modeling of carbides in multicomponent systems. Focus has been made on systems interesting for cemented carbide production but the results are also useful for many other application were the material consist of different carbides, for example tool steels/high speed steels. The Co-W-C system forms the basis in cemented carbide production. An accurate thermodynamic description of this system is therefore crucial for extrapolation into higher order systems. New experimental results on the liquid+fcc+graphite+WC and liquid+fcc+WC+M6C equilibrium temperatures,
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7

Yamasaki, Shingo. "Modelling precipitation of carbides in martensitic steels." Thesis, University of Cambridge, 2004. https://www.repository.cam.ac.uk/handle/1810/218538.

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The purpose of this work was to model carbide precipitation in steels of a quaternary system which includes two substitutional elements. The work focuses on secondary hardening steels which are used for high-strength components, where hydrogen embrittlement is one of the major factors responsible for failure. It is believed that carbide particles can act as hydrogen trapping sites, thus reducing the risk of embrittlement. The thesis begins with a review of the physical metallurgy of secondary hardening steels and the phenomena of hydrogen embrittlement and hydrogen trapping. The basic theory f
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8

Haglund, Sven. "Sintering of cemented carbides : experiments and modeling /." Stockholm : Tekniska högsk, 1998. http://www.lib.kth.se/abs98/hagl0529.pdf.

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9

Liu, Chunxin. "Alternative binder phases for WC cemented carbides." Thesis, KTH, Materialvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168229.

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WC cemented carbides are composites consisting of WC and a binder phase. WC/Co is widely used as cutting tools due to its excellent combination of hardness and toughness. This thesis work was performed at the R&amp;D department of Sandvik Coromant and aimed to find the alternative binder phase to substitute cobalt. Several compositions of Fe-Ni and Fe-Ni-Co binder have been investigated in this study. The WC/Co reference samples were also prepared. The initial compositions were decided by the CALPHAD method. The samples were then produced by the means of powder metallurgy. The producing condit
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10

Kaplan, Bartek. "Equilibrium aspects of Cr-alloyed cemented carbides." Doctoral thesis, KTH, Termodynamisk modellering, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175856.

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In view of the extensive use of Cr as a grain growth inhibitor in WC-Co cemented carbides this thesis comprises a combined experimental and ab initio study of a number of critical issues pertaining to phase equilibria of the subsystems to the W-Co-Cr-C system. To be able to predict which of the stable Cr-carbides forms above the solubility limits of Cr and C in the fcc phase the respective solubility of Co in Cr23C6, Cr7C3 and Cr3C2 are investigated experimentally. Furthermore, the site occupancies of Co in Cr7C3 are investigated by neutron diffraction as a first step towards a more realistic
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11

Salmasi, Armin. "Simulation of Gradient Formation in Cemented Carbides." Thesis, KTH, Materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192654.

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The aim of the present work is to study the formation of the cubic carbide phase (gamma phase) free gradient zone and the gamma cone structure at the edges of gradient sintered cemented carbides. Four types of cemented carbides; WCTi(C,N)-Co, WC-Ti(C,N)-Ni, WC-Ti(C,N)-Fe, WC-(Ti,Ta,NB)(C,N)-Co were gradient sintered and the thicknesses of the gradients were measured. Formation of the gradients is simulated and the simulations results are compared with experimental data. For all of the one-dimensional simulations, the DICTRA [1] software is used. The two-dimensional simulations are carried out
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12

Singh, Handa Sukhdeep. "Precipitation of Carbides in a Ni-based Superalloy." Thesis, Högskolan Väst, Avd för tillverkningsprocesser, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-6867.

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Alloy B is relatively new precipitation hardening superalloy. It´s applications are in the hot sections of the aero engines, rocket nozzles, gas turbines and in the chemical and petro-leum applications. The alloy is characterized by keeping high strength at elevated tempera-tures and high creep resistance. It´s excellent mechanical properties and corrosion resis-tance are due to the balanced amount of the coherent γ' matrix, combined with other alloy-ing elements and carbides. There are three types of carbides which can be found in nickel-based superalloys: MC, M 23C6 and M6C. Primary MC carbi
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13

Olajire, Kabiru Ayinde. "Machining of aerospace steel alloys with coated carbides." Thesis, Coventry University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301195.

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14

Brungs, A. J. A. "Transition metal carbides as catalysts for methane reforming." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365881.

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15

Borchardt, Lars, Claudia Hoffmann, Martin Oschatz, et al. "Preparation and application of cellular and nanoporous carbides." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138910.

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A tutorial review on cellular as well as nanoporous carbides covering their structure, synthesis and potential applications. Especially new carbide materials with a hierarchical pore structure are in focus. As a central theme silicon carbide based materials are picked out, but also titanium, tungsten and boron carbides, as well as carbide-derived carbons, are part of this review<br>Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich
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16

Lindersson, Sebastian. "Reactivity of Galinstan with Specific Transition Metal Carbides." Thesis, Uppsala universitet, Oorganisk kemi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227110.

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17

Bojestig, Eric. "Adhesion of CVD coatings on new cemeted carbides." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-298648.

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Steel turning inserts cemented carbides have a binder phase consisting of cobalt (Co). However, in recent years a study from the United States National Toxicity Program (NTP) found that cobalt powder is carcinogenic upon inhalation. The European Union's REACH have therefore also classified cobalt powder as carcinogenic upon inhalation. The worldwide search to find a replacement has therefore lately intensified. It is important that the alternative binder phase has no negative effects on the properties of the insert. In this thesis the adhesion between a multilayer ceramic chemical vapor deposi
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18

Alshibane, Ihfaf. "Phase transformations of ternary carbides, nitrides and carbonitrides." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/30702/.

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The development of novel efficient catalytic materials to improve the efficiency of industrial processes has been the driving force for many academic and industrial studies. The general approach adopted to enhance the activity of a given catalytic formulation is usually based on enhancing the structural and structural properties (e.g. crystal size and surface area) by adopting new synthesis methods, by supporting the active phase or by modifying the reactivity of the parent materials by adding dopants. However, in a less studied approach, it has been shown that the presence of interstitial spe
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19

Engman, Alexander. "Mechanical properties of bulk alloys and cemented carbides." Thesis, KTH, Materialvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230897.

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The usage of cobalt (Co) as binder phase material in cemented carbides has been questioned becauseof the potential health hazards associated with cobalt particle inhalation. Cobalt is used because ofits excellent adhesive and wetting properties, combined with adequate mechanical properties. Thepurpose of this work is to investigate the mechanical properties of Fe-Ni bulk alloys and WC-Cocemented carbides using Integrated Computational Materials Engineering (ICME) methods com-bined with FEM data. The report investigates the mechanical properties of several bulk alloys inthe Fe-Ni system as a fu
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20

Owais, Tariq Muhammad. "Impact of pressure on Sintering of Cemented Carbides." Thesis, KTH, Materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-123170.

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In this Master Thesis work, the effect of pressure on sintering of cemented carbides is investigated. Special focus hasbeen given to the residual porosity after sintering. It is well known that sintering shrinkage depends on binder phasecontent, grain size, temperature and pressure. Thus 4 different cemented carbides grades were selected. The gradeswere pressed into standard products and TRS (Tensile Rupture Strength) rods with two different shrinkage factors.These were then sintered at different pressures and temperatures. Thereafter the impact of pressure on propertiessuch as Density, Coerci
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21

Borchardt, Lars, Claudia Hoffmann, Martin Oschatz, et al. "Preparation and application of cellular and nanoporous carbides." Royal Society of Chemistry, 2012. https://tud.qucosa.de/id/qucosa%3A27792.

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Abstract (sommario):
A tutorial review on cellular as well as nanoporous carbides covering their structure, synthesis and potential applications. Especially new carbide materials with a hierarchical pore structure are in focus. As a central theme silicon carbide based materials are picked out, but also titanium, tungsten and boron carbides, as well as carbide-derived carbons, are part of this review.<br>Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
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22

Kerr, David Donaldson Carleton University Dissertation Engineering Mechanical. "Corrosion, erosion and oxidation of new cemented carbides." Ottawa, 1989.

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23

Lai, Chung-Chuan. "Thin Film Synthesis of New Nanolaminated Ternary Carbides." Licentiate thesis, Linköpings universitet, Tunnfilmsfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-125289.

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Ternary transition metal carbides with inherently nanolaminated crystal structure are a class of materials with typically higher damage tolerance, better machinability and lower brittleness compared to the binary counterparts, yet retaining their satisfactory electrical and thermal conductivity. Their interesting properties can be related to the laminated structure. Though studies of their properties based on calculations and bulk materials have suggested potential thin film applications, such as high temperature hard coatings and electrical contacts, a relatively small number of these phases
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24

Al-Motin, Md Abdulla Materials Science &amp Engineering Faculty of Science UNSW. "Effects of metastable carbide destabilization on metal dusting of ferritic iron." Awarded by:University of New South Wales. Materials Science & Engineering, 2008. http://handle.unsw.edu.au/1959.4/41514.

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Metal dusting corrosion has been known for more than a 100 years as an industrial problem. As a result of extensive research over the last five decades several mechanisms have been evolved involving ferritic materials. However, a complete understanding is yet lacking. One of the most referred models, developed by Hochman-Grabke, suggests that formation of metastable cementite and its subsequent decomposition is the central aspect of the process. To verify this hypothesis, an Fe-Si model was designed based on silicon's ability to retard cementite formation. However, this strategy was unsuccessf
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25

Weigert, Erich. "An ex-situ and in-situ evaluation of carbides as potential electrocatalysts." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 156 p, 2008. http://proquest.umi.com/pqdweb?did=1456296211&sid=11&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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26

TONELLO, KAROLINA P. dos S. "Compositos a base de Alsub(2)Osub(3) com adicoes de NbC e de MgO." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11780.

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Made available in DSpace on 2014-10-09T12:55:44Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:05:13Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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27

Tarragó, Cifre Jose María. "Damage tolerance of cemented carbides under service-like conditions." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/403888.

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Hardmetal industry is continuously seeking for high-performance products at reduced costs. In addition, it is strongly struggled by the high and volatile prices of raw materials. At this juncture, producers and end-users are deeply concerned in increasing the performance and enhancing service-life and reliability of engineering products, and replacing current constituents by alternative and less critical materials. Premature and unexpected fracture, together with wear, is the main damage phenomenon limiting the life in most cemented carbide applications. In the vast majority of cases such rupt
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28

Sandoval, Ravotti Daniela Andreina. "Small-scale testing of micromechanical response of cemented carbides." Doctoral thesis, TDX (Tesis Doctorals en Xarxa), 2019. http://hdl.handle.net/10803/668049.

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Cemented carbides are composite materials widely used in different industry fields within applications involving wear, due to their outstanding wear resistance. The most commonly used are WC-Co grades, for Co wettability with the carbide and adhesion characteristics. Emergence of new applications, the existence of advanced characterization techniques, economic and environmental aspects, among others, encourages the development of a new cemented carbides generation containing other binding phases as Ni and Fe or alloys of them. Furthermore, Co powder has been classified as very toxic for the hu
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29

Mao, Ou. "Formation and stability of Sm¦2Fe¦1¦7 carbides." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30331.pdf.

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30

Sundberg, Jill. "Triboactive Low-Friction Coatings Based on Sulfides and Carbides." Doctoral thesis, Uppsala universitet, Oorganisk kemi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-230989.

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For sustainable development, it is highly important to limit the loss of energy and materials in machines used for transportation, manufacturing, and other purposes. Large improvements can be achieved by reducing friction and wear in machine elements, for example by the application of coatings. This work is focused on triboactive coatings, for which the outermost layer changes in tribological contacts to form so-called tribofilms. The coatings are deposited by magnetron sputtering (a physical vapor deposition method) and thoroughly chemically and structurally characterized, often theoretically
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31

Clark, Jeremy Neil. "The reactivity of some transition metal nitrides and carbides." Thesis, University of Plymouth, 1995. http://hdl.handle.net/10026.1/1891.

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The formation 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 theory and applications of thermal analytical techniques are reviewed. Surface area determination and estimation of average crystallite size by the BET method utilizing the adsorption of nitrogen gas at -196 X are explained along with the application of x-ray dififractometry ajid scanning ele
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32

Sipola, Josefin. "Quality Management during Sintering of Cemented Carbides and Cermets." Thesis, Uppsala universitet, Oorganisk kemi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-253946.

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The magnetic properties, coercivity, Hc, and weight-specific magnetic saturation, CoM, are two important quality characteristics in cemented carbides and ceramic metals, cermets. These properties give information about grain size and binder phase content, and are influenced by the different stages in the sintering process. This master thesis aim to investigate how the magnetic properties in cemented carbides are influenced by the top temperature during sintering and how the sintering processes used for cermets can be optimized in order to gain better magnetic properties in the final products.
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33

Berglund, Lina. "The Effect of Cooling Rate on Sintered Cemented Carbides." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-288541.

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Magnetic measurements are useful tools for quality control of cemented carbides. Previous work at Sandvik Mining and Rock Technology has shown that the coercivity increases with increased cooling rate during sintering for a specific grade.  This study aims to investigate why the coercivity changes with the cooling rate and if this is true for other cemented carbide grades as well. Three different cemented carbide grades were sintered with different cooling rates and evaluated with coercivity, Cobalt-magnetic saturation and hardness measurements, and with microscopy and Electron Backscatter Dif
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34

Kennedy, Jennifer Louise. "Rapid microwave synthesis and characterisation of group 13 carbides." Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6504/.

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This thesis describes the rapid microwave synthesis and subsequent structural characterisation of the group 13 carbides; specifically aluminium carbide, Al4C3 and boron carbide, typically B4C or B13C2. Due to practical considerations, which will be described in Chapters Three and Four, syntheses were conducted using elemental precursors. Using a multi-mode microwave cavity (MMC) with an operating frequency of 2.45 GHz it was necessary to make use of a sealed and inert environment for the synthesis of oxide-free products. This was rationalised by the high stability of the oxides of aluminium (f
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35

Heiligers, Christiané. "On the microstructure and physical properties of hot pressed (Hf, Ti) C." Thesis, Nelson Mandela Metropolitan University, 2007. http://hdl.handle.net/10948/523.

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The microstructure and physical properties of hot pressed (Hf, Ti) C have been investigated with the aim of producing a cutting tool material with similar hardness to that of WC-Co and TiC-based cermets. Sintered samples were hot pressed from HfC0.7 and TiC0.9 powders using powder metallurgical techniques and the processing cycle was optimized for this system. Ni was used as a binder in selected samples and C black was added to compensate for sub-stoichiometry and to aid in the reduction of oxides formed during milling. Microstructural analyses were performed by scanning and transmission elect
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36

Hashe, Nobom Gretta. "Characterization of WC-VC-Co and WC-VC-TiC-Co hardmetals." Thesis, Nelson Mandela Metropolitan University, 2007. http://hdl.handle.net/10948/522.

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This thesis contains the results of a study focused on cubic carbide and carbonitride grain growth retardation in hardmetals. Large additions of VC, or VC and TiC, or (W,V)C were made to the WC-Co hardmetal, which was then sintered in vacuum or nitrogen. The effectiveness of Ti as the grain growth inhibitor, and the influence of nitrogen sintering on grain coarsening were investigated using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffractrometry (XRD) and atom probe field ion microscope (APFIM). Analysis of vacuum-sintered WC-VC-Co revealed that the cu
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37

Shao, Huifang. "Bimetallic carbides as catalysts for dry reforming and steam reforming." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4761.

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Thesis (Ph. D.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains x, 174 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 155-166).
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38

Ren, Qiao. "Tungsten carbides as anode electrocatalyst of direct methanol fuel cell." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 97 p, 2007. http://proquest.umi.com/pqdweb?did=1400426011&sid=12&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Thesis (M.S.)--University of Delaware, 2007.<br>Principal faculty advisors: Jingguang G. Chen, Dept. of Chemical Engineering; and Thomas P. Beebe, Jr., Dept. of Chemistry & Biochemistry. Includes bibliographical references.
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39

Larsson, Niklas. "Gradient formation in cemented carbides with 85Ni:15Fe-binder phase." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-256503.

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In today’s inserts used for metal cutting the binder phase consists of cobalt (Co).However, EU’s REACH programme and the U.S’s National Toxicity Programme(NTP) classified Co as toxic/carcinogenic. Therefore, there is a strong need toinvestigate alternative binder phases. This thesis covers sintering and characterisationof cemented carbide with a binder phase consisting of nickel (Ni) and iron (Fe) withthe composition of 85Ni:15Fe. The aim was to study the gradient formation of turninginsert and find sintering processes to achieve a gradient structure with the targetedthickness of 26 microns. S
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40

Vallance, Simon. "Microwave synthesis and mechanistic examination of the transition metal carbides." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10548/.

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This thesis aims to describe the ultra-rapid synthesis of a number of important transition metal carbides as well as investigating their reaction mechanisms. 4 binary systems are discussed; Nb-C, Mo-C, Ta-C and W-C, and work carried out on the ternary system, Nb-Ta-C, is also evaluated. Carbide production was investigated from both the oxide and elemental precursors. Ultra-rapid synthesis has been achieved through the development of a reproducible experimental technique and the investigation into a plethora of reaction variables as well as microwave applicators and powers. This resulted in, sp
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41

Sun, Weiwei. "Ab initio study of transition metal carbides and actinide compounds." Doctoral thesis, KTH, Materialteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158005.

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Two classes of materials are investigated using ab intio methods based on density functional theory. The structural properties, electronic structure and thermodynamic properties of binary and ternary transition metal carbides are discussed in details. In addition, two actinide compounds will be presented. A new actinide monoxide, ThO, is predicted to be stable under pressure, and the weakly correlated UN is investigated as regards to its magnetic properties and electronic structure. The atomic and electronic structures of various types of single defects in TiC such as vacancies, interstitial d
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42

Edström, Daniel. "Growth and Mechanical Properties of Transition Metal Nitrides and Carbides." Doctoral thesis, Linköpings universitet, Tunnfilmsfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-132272.

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The atomic-scale dynamical processes at play during film growth cannot be resolved by even the most advanced experimental methods. As such, computational methods, and chiefly classical molecular dynamics, are the only available research tools to study these processes. The investigation of key dynamical processes during thin film growth yields a deeper understanding of the film growth evolution, ultimately allowing for the optimization of experimental parameters and tailoring of film properties. This thesis details the study of fundamental surface dynamics processes, and the role played by prim
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43

Dall'Agnese, Yohan. "Study of early transition metal carbides for energy storage applications." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30025/document.

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La demande urgente d'innovations dans le domaine du stockage de l'énergie est liée au développement récent de la production d'énergie renouvelable ainsi qu'à la diversification des produits électroniques portables qui consomment de plus en plus d'énergie. Il existe plusieurs technologies pour le stockage et la conversion électrochimique de l'énergie, les plus notables étant les batteries aux ions lithium, les piles à combustible et les supercondensateurs. Ces systèmes sont utilisés de façon complémentaire des uns aux autres dans des applications différentes. Par exemple, les batteries sont plu
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44

Walbrühl, Martin. "ICME guided development of cemented carbides with alternative binder systems." Doctoral thesis, KTH, Materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-214108.

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The development of alternative binder systems for tungsten carbide (WC) based cemented carbides has again become of relevance due to possible changes in EU regulations regarding the use of Cobalt (Co). A framework for the ICME (Integrated Computational Materials Engineering) based Materials Design is presented to accelerate the development of alternative binder systems. Part one of this work deals with the design of the cemented carbide composite hardness. It has been shown that the intrinsic binder hardness is comparable to a bulk metal alloy and that based on the binder solubilities a solid
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45

Cassidy, Brett. "Stimulation of catalytic activity of transitional metal nitrides and carbides." Thesis, Cassidy, Brett (2017) Stimulation of catalytic activity of transitional metal nitrides and carbides. Honours thesis, Murdoch University, 2017. https://researchrepository.murdoch.edu.au/id/eprint/40452/.

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Current estimations show hydrogen production to be in excess of 55 million tonnes annually. With consumption growing globally by six percent annually, new feedstocks such as ammonia need to be explored to meet demand. Ammonia has many attractive characteristics as a source for hydrogen, such as its product stream when decomposed producing no carbon oxides or sulfurs. Research currently is limited on the decomposition of ammonia to produce hydrogen supported by transitional metal catalysts. This lack of research has suppressed the development of this technology. This thesis project is intended
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46

Jammula, Chaitanya Krishna. "Correlating the microstructure with wear properties of aluminium silicon carbides." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Industriell produktutveckling, produktion och design, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45820.

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Aluminium is one of the metals playing a prominent role in automobile industry after cast iron. Because of its light weight property and good mechanical properties. When aluminium reinforced with silicon carbide showing good tribological properties and improved strength. Aluminium silicon carbide needs some good wear and frictional properties to use it as break disc. Aluminium reinforced with 15% and 20% silicon carbide and casted in two different ways, liquid casting and stir casting. Four different composites are compared in this paper. Hardness test was carried out on the samples. Increase
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47

Emanuelli, Lorena. "Study of the properties of cemented carbides from industrial production." Doctoral thesis, Università degli studi di Trento, 2018. https://hdl.handle.net/11572/368569.

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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 strongly related to microstructure, namely the binder amount and the carbide grain size. Increasing the binder content and the carbide grain size, the hardness decreases ad the fracture toughness increases. In this PhD, the correlations between the mechanical properties of WC-Co and the microstructural char
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48

Emanuelli, Lorena. "Study of the properties of cemented carbides from industrial production." Doctoral thesis, University of Trento, 2018. http://eprints-phd.biblio.unitn.it/3360/1/PhD_thesis_LORENA_EMANUELLI_definitiva.pdf.

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Abstract (sommario):
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 strongly related to microstructure, namely the binder amount and the carbide grain size. Increasing the binder content and the carbide grain size, the hardness decreases ad the fracture toughness increases. In this PhD, the correlations between the mechanical properties of WC-Co and the microstructural char
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49

TONELLO, KAROLINA P. dos S. "Compósitos de alumina com adições de NbC, TaC e TiC para aplicação em ferramentas de corte." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10206.

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Made available in DSpace on 2014-10-09T12:36:00Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:59:33Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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50

Ehrenborg, Anna. "Investigation of the Cr solubility in the MC phase where M = Ti, Ta." Thesis, Uppsala universitet, Strukturkemi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-285897.

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In this work the chromium solubility in MC, and M in Cr3C2 and Cr7C3 carbides in the Ti-Cr-C and Ta-Cr-C system have been examined experimentally. Special attention is given to the cubic MC phase due to its frequent use in industrial cemented carbides. A sample series was made where half of the samples were arc-melted and all samples were heat-treated at different temperatures. By arc-melting some of the samples it was possible to compare the arc-melted and non arc-melted samples to confirm equilibrium. Three phases were expected in each sample. The microstructure was examined by LOM and SEM.
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