Relevant bibliographies by topics / Metal carbide

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Metal carbide'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Metal carbide"

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Penghui, Yang, Hanguang Fu, Lin Jian, Cheng Haiqiang, and Lei Yongping. "Experimental and ab initio study of the influence of a compound modifier on carbidic ductile iron." Metallurgical Research & Technology 116, no. 3 (2019): 306. http://dx.doi.org/10.1051/metal/2018124.

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To improve the morphology of carbides in carbidic ductile iron, a compound modifier consisting of 0.1% Nb + 0.1% Ti + 0.1 wt.% Y was added to the base ductile iron with chemical composition of 3.72% C, 2.77% Si, 0.51% Mn, 0.99% Cr and balance Fe (wt.%). The effect of this compound modifier on the microstructures of carbidic ductile iron was studied. Also, first-principles calculations were carried out to better understand the modification mechanisms. The results showed that the maximum diameter of spheroidal graphite nodules decreased from 58 to 34 µm after the addition of compound modifier, and continuous carbide networks changed into a broken network. The roundness of graphite nodules decreased slightly, and the percent nodularity of the graphite nodules and the number of carbides decreased by 3 and 1.8%, respectively. Compounds with higher melting point are formed thanks to the compound modifier which acts as heterogeneous core, and the remaining Ti and Nb elements can be selectively attracted by (010) surface of Fe8Cr4C4. Furthermore, Cr elements can be easily replaced by Ti and Nb in the carbides to form more stable Fe8Cr3TiC4 and Fe8Cr3NbC4, which can prevent the continuing growth of carbide on the Fe8Cr4C4 (010) crystal surface and break the continuous network M3C. Y atoms cannot be directly adsorbed onto Fe8Cr4C4 (010) surfaces. They combine first with oxygen in the ductile iron to form Y2O3. The work of adhesion of the interface between a Y2O3 (100) and a Fe8Cr4C3 (010) is predicted to be 0.3 J/m2. The addition of Y element is found to have a positive effect on breaking up the continuity of the carbide network.
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De Bonis, Angela, Mariangela Curcio, Antonio Santagata, Agostino Galasso, and Roberto Teghil. "Transition Metal Carbide Core/Shell Nanoparticles by Ultra-Short Laser Ablation in Liquid." Nanomaterials 10, no. 1 (January 14, 2020): 145. http://dx.doi.org/10.3390/nano10010145.

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Transition metal carbide nanoparticles are a class of technological interesting materials with a wide range of applications. Among metal carbides, tantalum carbides have good compatibility with the biological environment while molybdenum carbides are used as catalyst in electrochemical reactions. Laser ablation of bulk transition metal targets in some liquids is here reported and laser ablation in organic solvents is used as simple synthetic strategy for the production of carbide nanostructures. Herein, the nanoparticles produced by ultra-short laser ablation of tantalum and molybdenum in water, acetone, ethanol and toluene have been characterized by TEM, XRD and XPS analysis. The combined effect of metal and solvent chemical and physical properties on the composition of the nanomaterials obtained has been pointed out. In particular, the different reactivity of Ta and Mo with respect to oxidizing species determines the composition of particles obtained in water, on the other hand the organic solvents decomposition allows to obtain transition metal carbide (TMC) nanoparticles. The observed carbonaceous shell formed on TMC allows to protect the particle’s carbidic core and to improve and tailor the applications of these nanomaterials.
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He, Bao, Jing Li, Cheng-bin Shi, and Hao Wang. "Effect of Mg addition on carbides in H13 steel during electroslag remelting process." Metallurgical Research & Technology 115, no. 5 (2018): 501. http://dx.doi.org/10.1051/metal/2018071.

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The effect of Mg on carbides precipitation in H13 steel was studied based on the Thermo-Calc thermodynamic calculation. The results showed that the precipitation temperature of MC phase was significantly improved by adding Mg. The Mg addition had no effect on the type of precipitated carbides. The as-cast microstructure and the characteristic of carbides in Mg-containing H13 steel were analyzed by OM and SEM-EDS. The results showed that the segregation of as-cast microstructure was released and the size of carbides was reduced by increasing Mg. The distribution of carbides was more homogeneous. The formed MgO · Al2O3 arising from Mg treatment provided preferred nucleation site for TiN, which was the core of heterogeneous nucleation of carbides, resulted in decreasing the size of carbides. Furthermore, partial Mg would melt into the carbides, which would change the morphology of carbide and induce the formation of leaf-like carbides. The electron probe micro-analysis (EPMA) results showed that the segregation of V and Mo in H13 steel was inhibited by Mg, and the dissolved Mg in carbide promoted the heterogeneous nucleation of carbides.
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Guerra, Francisco Vapeani, Arnoldo Bedolla-Jacuinde, Jorge Zuno-Silva, Ignacio Mejia, Edgar Cardoso-Legorreta, and Alberto Arenas-Flores. "Effect of the simultaneous Ti and W addition on the microstructure and wear behavior of a high chromium white cast iron." Metallurgical Research & Technology 116, no. 6 (2019): 602. http://dx.doi.org/10.1051/metal/2019031.

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The present work analyzes the effect of 0.7%Ti and 1.7%W addition to a 17% chromium white iron in as-cast condition and after destabilization heat treatment. These alloys are commonly used in applications where a high abrasive wear resistance is required. For this reason, in addition to the characterization, a complementary wear test was performed. The alloys were characterized by optical and electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. The simultaneous Ti and W addition promoted the (Ti,W)C primary carbides formation which grow in the early stages of solidification. These carbides were found well distributed in the iron matrix with an average hardness value of 2450 HV. Moreover, tungsten was found partially distributed in the different phases increasing the microhardness by solid solution and refining the eutectic carbide. These microstructural modifications resulted in the increase of the bulk hardness and abrasive wear resistance of the alloyed iron. After destabilization heat treatment, the carbide precipitation and the matrix transformation produced a secondary hardening reducing the wear losses. Based in the results of the present study, the simultaneous addition of these elements to promote the (Ti,W)C carbide formation during solidification represents an effective method to increase the hardness and wear resistance of these kind of alloys via small additions.
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Krutskii, Yuriy L., Tatiana M. Krutskaya, Tatiana S. Gudyma, Konstantin B. Gerasimov, Roman R. Khabirov, and Anna V. Mass. "Carbothermal and boron carbide reduction of oxides of some transition metals." MATEC Web of Conferences 340 (2021): 01040. http://dx.doi.org/10.1051/matecconf/202134001040.

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The study presents a possible mechanism to produce carbides and diborides of transition metals, such as titanium, vanadium, chromium and zirconium. The carbothermal synthesis of transition metal carbides has defined the direct dependence between the thermodynamic stability of oxides and the temperature range of the reduction onset (the stronger the oxide, the higher the value of the temperature is). It reaches 2000-2100, 1500-1600, 1300-1400 and 2100-2200°C for such carbides as TiC, VC0,88, Cr3C2 and ZrC respectively. The same dependence has not been found for the diborides of these metals. Optimum synthesis temperatures for all these compounds lie in the range of 1600-1700 °C. This viable method to produce transition metal carbides consists in the transfer of vaporous higher and lower oxides. Diborides preparation involves the transfer of oxides and boron vapors onto the surface of the carbon material with the subsequent chemical interaction. In the case of carbide-boron reduction of zirconium oxide in excess of boron carbide, the reaction product will be a composite material (B4C – ZrB2). The ceramics based on this composite possesses high performance properties.
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Sharin, P. P., M. P. Akimova, and S. P. Yakovleva. "Structural-Phase State of the Interphase Boundary at Thermal Diffusion Metallization of Diamond Grains by Cr and Ti." Materials Science Forum 992 (May 2020): 670–75. http://dx.doi.org/10.4028/www.scientific.net/msf.992.670.

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Structural-phase state of the diamond-metallized coating interphase boundary after thermal diffusion metallization of diamond grains by transition metals Cr, Ti were studied. Metallization were conducted under temperature-time mode corresponding to the sintering of cemented carbide matrices with Cu impregnation. The structural-phase state of the metallized coating and diamond-coating interphase boundary was studied by scanning electron microscopy, X-ray phase analysis and Raman spectroscopy. It was found that a thin continuous metal carbide coating chemically bonded to the diamond and consisting of the corresponding metal, their carbides and small amount of graphite phases is formed during thermal diffusion metallization of diamond by Cr and Ti under the conditions specified in the experiment. It was shown that graphite is formed not by a continuous layer, but in the form of local inclusions. This ensures a strong adhesion of the metallized coating to the diamond through the carbides of the corresponding metals. The results can be useful in the development of compositions and technological methods that provide an increased level of diamond retention in the matrices of tools based on cemented carbide powder mixtures.
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Weinberger, Christopher R., and Gregory B. Thompson. "The crystal structure and phase stability of the zeta phase in the group VB transition metal carbides: a computational investigation." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 75, no. 5 (September 20, 2019): 870–79. http://dx.doi.org/10.1107/s2052520619011302.

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The crystal structure and composition of the zeta phase in the group VB transition metal carbides are not completely understood despite decades of experimental studies. As such, the phase rarely appears on phase diagrams of the group VB transition metal carbides. There is currently renewed interest in this phase, as tantalum carbide composites exhibit high fracture toughness in the presence of this phase. This work extends the initial computational study using density functional theory of the phase stability of the zeta phase in the tantalum carbide system, where the tantalum carbide zeta-phase crystal structure and stability were determined, to the niobium and vanadium carbides. It is shown that the zeta phases in the three systems share the same crystal structure and it is an equilibrium phase at low temperatures. The carbon atom ordering in the three different phases is explored and it is demonstrated that the zeta phase in the tantalum carbides prefers to order carbon atoms differently than in the niobium and vanadium carbide zeta phases. Finally, the properties of this crystal are computed, including elastic constants, electronic densities of states and phonon dispersion curves, to illustrate that this crystal structure is similar to other transition metal carbides.
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Li, Qing, Guangxu Cheng, Mu Qin, Yafei Wang, and Zaoxiao Zhang. "Research on Carbide Characteristics and Their Influence on the Properties of Welding Joints for 2.25Cr1Mo0.25V Steel." Materials 14, no. 4 (February 13, 2021): 891. http://dx.doi.org/10.3390/ma14040891.

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The carbide characteristics of 2.25Cr1Mo0.25V steel have an extremely important influence on the mechanical properties of welding joints. In addition, hydrogen resistance behavior is crucial for steel applied in hydrogenation reactors. The carbide morphology was observed by scanning electron microscopy (SEM) and the carbide microstructure was characterized by transmission electron microscopy (TEM). Tensile and impact tests were carried out and the influence of carbides on properties was studied. A hydrogen diffusion test was carried out, and the hydrogen brittleness resistance of welding metal and base metal was studied by tensile testing of hydrogenated samples to evaluate the influence of hydrogen on the mechanical properties. The research results show that the strength of the welding metal was slightly higher and the Charpy impact value was significantly lower compared to the base metal. The hydrogen embrittlement resistance of the welding metal was stronger than that of the base metal. The presence of more carbides and inclusions was the main cause of the decreased impact property and hydrogen brittleness resistance of the welding metal. These conclusions have certain reference value for designing and manufacturing hydrogenation reactors.
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Wyzga, Piotr, Lucyna Jaworska, Piotr Putyra, Marcin Podsiadlo, and Jolanta Cyboron. "Characterization of Metal-Like Carbides-Graphene Composite Prepared by SPS Method." Key Engineering Materials 655 (July 2015): 87–91. http://dx.doi.org/10.4028/www.scientific.net/kem.655.87.

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High hardness, good thermal and electrical conductivity make carbides technologically important materials. The high melting temperature and low coefficients of self-diffusion make it difficult to obtain full dense material. In this paper the results of Spark Plasma Sintering (SPS) of transition metal carbides: NbC, TaC, TiC, ZrC, VC with the addition of graphene 10-20 nm x 14 microns in an amount of 2.5 mass % are presented. Powders were mixed in isopropyl alcohol in a planetary ball mill for 1h. The sintering processes was carried out at 2200°C at two different times: 5 and 30 min. Microstructure of the samples was analyzed using scanning electron microscopy. The measurements of density, Young's modulus hardness and electrical properties were carried out, also. The best properties were obtained for titanium carbide powder, sintered for 30 min. The most significant density increase of the sintered carbide–graphene composite by about 5.3% (depending on increasing sintering duration) was obtained for niobium carbide, while the smallest densities change for zirconium carbide.
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ZURER, PAMELA. "Caged Metal Carbide." Chemical & Engineering News 79, no. 4 (January 22, 2001): 16. http://dx.doi.org/10.1021/cen-v079n004.p016a.

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Dissertations / Theses on the topic "Metal carbide"

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Tengstrand, Olof. "Transition metal carbide nanocomposite and amorphous thin films." Doctoral thesis, Linköpings universitet, Tunnfilmsfysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-104929.

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This thesis explores thin films of binary and ternary transition metal carbides, in the Nb-C, Ti-Si-C, Nb-Si-C, Zr-Si-C, and Nb-Ge-C systems. The electrical and mechanical properties of these systems are affected by their structure and here both nanocomposite and amorphous thin films are thus investigated. By appropriate choice of transition metal and composition the films can be designed to be multifunctional with a combination of properties, such as low electric resistivity, low contact resistance and high mechanical strength. Electrical contacts are one example of application that has been of special interest in this thesis. Since some industrially important substrates used in electrical contacts soften at higher temperature, all films were deposited with dc magnetron sputtering at a low substrate temperature (200-350 °C). I show that the electrical resistivity and mechanical properties of composites consisting of nanocrystalline NbC grains (nc-NbC) in a matrix of amorphous C (a-C) depend strongly on the amount of amorphous C. The best combination of hardness (23 GPa) and electrical resistivity (260 μΩ*cm) are found in films with ~15 at.% a-C phase. This is a higher hardness and lower resistivity than measured for the more well studied Ti-C system if deposited under similar conditions. The better results can be explained by a thinner matrix of amorphous C phase in the case of NbC. The nc-NbC/a-C is therefore interesting as a material in electrical contacts. Si can be added to further control the structure and thereby the properties of binary Me-C systems. There are however, different opinions in the literature of whether Si is incorporated on the Ti or C site in the cubic NaCl (B1) structure of TiC. In order to understand how Si is incorporated in a Me-Si-C material I use a model system of epitaxial TiCx (x ~0.7). In this model system a few atomic percent of Si can be incorporated in the cubic TiC structure. The experimental results together with theoretical stability calculations suggest that the Si is positioned at the C sites forming Ti(Si,C)x. The calculation further shows a strong tendency for Si segregation, which is seen at higher Si contents in the experiments, where Si starts segregate out from the TiCx to the grain boundaries causing a loss of epitaxy. If Si is added to an Nb-C nanocomposite, it hinders the grain growth and thus a reduced size of the NbC grains is observed. The Si segregates to the amorphous matrix forming a-SiC. At the same time the resistivity increases and the hardness is reduced. With even higher amounts of Si (>25 at.%) into the Nb-Si-C material, grain growth is no longer possible and the material becomes amorphous. In order to separate between effects from the addition of Si and the choice of transition metal I compare the Nb-Si-C system to already published results for the Zr-Si-C system. I find that the hardness of the material depends on the amount of strong Si-C bonds rather than the type of transition metal. The reduced elastic modulus is, however, dependent on the choice of transition metal. I therefore suggest that it is possible to make Me-Si-C films with high wear resistance by an appropriate choice of transition metal and composition. Electron microscopy was of importance for determining amorphous structures of Nb-Si-C and Zr-Si-C at high Si contents. However, the investigations were obstructed by electron beam induced crystallization. Further investigations show that the energy transferred from the beam electrons to C and Si atoms in the material is enough to cause atomic displacements. The displacements cause volume fluctuations and thereby enhance the mobility of all the atoms in the material. The result is formation of MeC grains, which are stable to further irradiation. Finally, I have studied substitution of Ge for Si in a ternary system looking at Nb-Ge-C thin films. I show that the films consist of nc-NbC/a-C/a-Ge and that Ge in a similar way to Si decreases the size of the crystalline NbC grains. However, a transition to a completely amorphous material is not seen even at high Ge contents (~30 at.%). Another dissimilarity is that while Si bonds to C and forms a matrix of a-SiC, Ge tends to bond to Ge.
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Garg, Aaron R. "Transition metal carbide and nitride nanoparticles with Noble metal shells as enhanced catalysts." Thesis, Massachusetts Institute of Technology, 2018. https://hdl.handle.net/1721.1/121890.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemical Engineering, 2018
Cataloged from PDF version of thesis. Page 157 blank. Vita.
Includes bibliographical references (pages 137-153).
Core-shell nanostructures represent a promising and versatile design platform for enhancing the performance of noble metal catalysts while reducing the cost. Early transition metal carbides (TMCs) and nitrides (TMNs) have been identified as ideal core materials for supporting noble metal shells owing to their earth-abundance, thermal and chemical stability, electrical conductivity, and their ability to bind strongly to noble metals while still being immiscible with them. Unfortunately, the formation of surface oxides or carbon on TMCs and TMNs presents a difficult synthetic challenge for the deposition of atomically thin, uniform noble metal layers. Recent advances have enabled the synthesis of TMC core nanoparticles with noble metal shells (denoted as NM/TMC), although applicability toward TMN cores has not been previously demonstrated. Furthermore, the complete properties of these unique materials are still unknown.
This thesis conducts a detailed investigation of the synthesis, characterization, and catalytic performance of NM/TMC and NM/TMN core-shell nanoparticles to provide a comprehensive understanding of their material properties and the underlying phenomena. First, in-situ studies yielded insight into the mechanism behind the high temperature self-assembly of NM/TMC particles, indicating the presence of a metallic alloy phase preceding the formation of the core-shell structure upon insertion of carbon into the lattice. Next, the synthesis of NM/TMN nanoparticles was demonstrated via nitridation of a parent NM/TMC, and the structural and electronic properties of both core-shell materials were examined through in-situ X-ray absorption spectroscopy (XAS). The analysis revealed significant alterations to the electronic structure of the noble metal shell due to bonding interactions with the TMC and TMN cores, which led to weakened adsorbate binding energies.
Finally, the materials displayed improved performance for the oxygen reduction reaction (ORR), a critical challenge for fuel cell technologies. Notably, particles with complete, uniform shells exhibited unprecedented stability during electrochemical ageing at highly oxidizing conditions, highlighting the great potential of core-shell architectures with earth-abundant TMC and TMN cores for future ORR applications. Overall, this work will provide new opportunities toward the design of enhanced noble metal catalysts and enable further optimization of their performance.
by Aaron R. Garg.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Chemical Engineering
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Tan, Keng Ean. "Quantum mechanical modelling of refractory transition metal carbide films." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294188.

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Lai, Chung-Chuan. "Phase Formation of Nanolaminated Transition Metal Carbide Thin Films." Doctoral thesis, Linköpings universitet, Tunnfilmsfysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-137367.

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Research on inherently nanolaminated transition metal carbides is inspired by their unique properties combining metals and ceramics, such as higher damage tolerance, better machinability and lower brittleness compared to the binary counterparts, yet retaining the metallic conductivity. The interesting properties are related to their laminated structure, composed of transition-metalcarbide layers interleaved by non-transition-metal (carbide) layers. These materials in thin-film form are particularly interesting for potential applications such as protective coatings and electrical contacts. The goal of this work is to explore nanolaminated transition metal carbides from the aspects of phase formation and crystal growth during thin-film synthesis. This was realized by studying phases in select material systems synthesized from two major approaches, namely, fromdirect-deposition and post-deposition treatment. The first approach was used in studies on the Mo-Ga-C and Zr-Al-C systems. In the former system, intriguing properties have been predicted for the 3D phases and their 2D derivatives (socalled MXenes), while in the latter system, the phases are interesting for nuclear applications. In this work, the discovery of a new Mo-based nanolaminated ternary carbide, Mo2Ga2C, is evidenced from thin-film and bulk processes. Its structure was determined using theoretical and experimental techniques, showing that Mo2Ga2C has Ga double-layers in simple hexagonal stacking between adjacent Mo2C layers, and therefore is structurally very similar to Mo2GaC, except for the additional Ga layers. For the Zr-Al-C system, the optimization of phase composition and structure of Zr2Al3C4 in a thin-film deposition process was studied by evaluating the effect of deposition parameters. I concluded that the formation of Zr2Al3C4 is favored with a plasma flux overstoichiometric in Al, and with a minimum lattice-mismatch to the substrates. Consequently, epitaxial Zr2Al3C4 thin film of high quality were deposited on 4H-SiC(001) substrates at 800 °C. With the approach of post-deposition treatment, the studies were focused on a new method of thermally-induced selective substitution reaction of Au for the non-transition-metal layers in nanolaminated carbides. Here, the reaction mechanism has been explored in Al-containing (Ti2AlC and Ti3AlC2) and Ga-containing (Mo2GaC and Mo2Ga2C) phases. The Al and Ga in these phases were selectively replaced by Au while the carbide layers remained intact, resulting in the formation of new layered phases, Ti2Au2C, Ti3Au2C2, Mo2AuC, and Mo2(Au1-xGax)2C, respectively. The substitution reaction was explained by fast outward diffusion of the Al or Ga being attracted to the surface Au, in combination with back-filling of Au, which is chemically inert to the carbide layers,to the vacancies. The substitution reaction was further applied to Ga-containing nanolaminated carbides, (Cr0.5Mn0.5)2GaC and Mo2GaC, motivated by development of novel magnetic nanolaminates. The former experiment resulted in the formation of (Cr0.5Mn0.5)2AuC, where the retained (Cr0.5Mn0.5)2C layers allowed a comparative study on the magnetic properties under the exchange of Ga for Au. After Au substitution, reduction in the Curie temperature and the saturation magnetization were observed, showing a weakened magnetic exchange interaction of the magnetic (Cr0.5Mn0.5)2 Clayers across the Au. In the Mo2GaC case, an Fe-containing MAX phase, Mo2AC with 50 at.% of Fe on the A site, was synthesized through selective substitution of Au-Fe alloy for the Ga layers, showing the first direct evidence for Fe in the MAX-phase structure. The substitution of Fe did not take place on another Mo2GaC sample tested for Fe exchange only, indicating the essential role of Au in catalyzing the Fe-substitution reaction. The knowledge gained from this thesis work contributes to improved approaches for attaining thin films of nanolaminated transition metal carbides with desired phase composition and crystal quality. The reports on the new nanolaminated phases through exchange interactions are likely to expand the family of nanolaminated carbides and advance their properties, and trigger more studies on related (quasi-) 2D materials.
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Hunt, Sean Thomas. "Engineering carbide nanoparticles coated with noble metal monolayers for catalysis." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104207.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemical Engineering, 2016.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 231-249).
The noble metals (NMs) comprise ruthenium (Ru), rhodium (Rh), palladium (Pd), silver (Ag), osmium (Os), iridium (Ir), platinum (Pt), and gold (Au). Together, these corrosion-resistant elements serve as nature's universal catalysts by binding reactant molecules neither too strongly nor too weakly. This allows for rapid catalytic transformations of reactants into useful products. Modern society, its current technologies, and its emerging renewable energy technologies are underpinned by precious metal catalysts. However, the noble metals are the least abundant elements in the lithosphere, making them prohibitively scarce and expensive for future global-scale technologies. Furthermore, the traditional catalyst engineering toolkit is ill-equipped to optimize the reactivity, stability, and loading of NM catalysts. The technologies developed in this thesis have two overarching implications. First, a method is developed to engineer non-sintered and metal-terminated transition metal carbide (TMC) nanoparticles. Featuring "noble metal-like" surface reactivity, TMCs are earth-abundant and exhibit many useful catalytic properties, such as carbon monoxide and sulfur tolerance. By designing TMC nanoparticles with controlled surface properties, this thesis offers new avenues for replacing noble metal catalysts with inexpensive alternatives. Second, a method is developed to synthesize TMC nanoparticles coated with atomically-thin noble metal monolayers. This offers new directions for improved catalyst designs by substantially enhancing reactivity and stability while reducing overall noble metal loadings. These synthetic achievements in nanoscale core-shell catalyst engineering were guided by computational quantum chemistry, model thin film studies, and advanced spectroscopic techniques. Examination of the catalytic utility of these new materials was performed in the context of water electrolysis, proton exchange membrane fuel cells, direct methanol fuel cells, and high temperature thermal reforming.
by Sean Thomas Hunt.
Ph. D.
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Sallom, Zuhair Kamil. "Evolution of particle characteristics in sintered hard metal." Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236236.

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Kieschke, Robert Richard. "The interface region in titanium reinforced with silicon carbide monofilaments." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335165.

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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 unsuccessful because silicon oxidized and amount of silicon remaining after silica formation was not sufficient to suppress cementite. On the other hand, germanium does not form a stable oxide in the conditions employed. A alloying with germanium did prevent Fe3C formation, but not dusting, which resulted from an alternative mechanism. Dusted particles were confirmed to be cementite for pure iron specimens (where cementite scale formed) and ferrite for alloys that did not form cementite. These observations are inconsistent with the prior model. In addition, the general features of metal dusting corrosion have been characterized. Kinetics of coking and metal wastage for ferritic materials (Fe, Fe-Si, Fe-Ge and Fe-Ge-Ni) were found to be linear in nature, though respective rates may vary due to the differences in alloy catalytic activity and reaction morphologies. The carbon diffusion coefficient in cementite was evaluated from Fe3C scaling rates. Crystallographic orientations of different forms of cementite were established. Internal cementite precipitates in pure iron accounted for by a very high degree of supersaturation with respect to carbon, indicating a non-equilibrium situation. Coking and dusting rates were found to be strongly correlated and their gas composition dependence indicate the contribution of the Boudouard reaction. Reactions with fixed carbon activity gases demonstrated that kinetics rather than thermodynamics control the reaction rates. However, at a particular temperature, these rates increase with carbon activity. Activation energies for coking and dusting are equal for a given alloy, meaning that the same process controls them. For Fe-lOGe alloy, in the early stages of reaction, grains with near (001) surfaces were more susceptible to graphitization than grains having near (110) surfaces, but the underlying cause has not been revealed.
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Kinzer, Raymond Edward. "Fourier transform infrared spectroscopy study of small transition-metal carbide clusters." [Fort Worth, Tex.] : Texas Christian University, 2009. http://etd.tcu.edu/etdfiles/available/etd-10152009-103514/unrestricted/kinzer.pdf.

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Rubiano, Rodrigo R. (Rubiano Ray). "Low temperature deposition of metal carbide films from single source precursors." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/34692.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994, and Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Materials Science & Engineering, 1994.
Includes bibliographical references (leaves 71-73).
by Rodrigo R. Rubiano.
B.S.
M.S.
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Books on the topic "Metal carbide"

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Upadhyaya, G. S., and Gopal S. Upadhyaya. Cemented tungsten carbides: Production, properties, and testing. Westwood, N.J: Noyes Publications, 1998.

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Buarzaiga, Mohamed M. Corrosion behavior of as-cast silicon carbide particulate/aluminum alloy metal-matrix composites. Ottawa: National Library of Canada, 1994.

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Fisher, G. T. Effects of composition and processing variables on transverse rupture strength and hardness of nickel-alloy-bonded titanium carbide. Pittsburgh, Pa: U.S. Dept. of the Interior, Bureau of Mines, 1987.

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Kreißl, F. R., ed. Transition Metal Carbyne Complexes. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1666-4.

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R, Kreissl F., and North Atlantic Treaty Organization. Scientific Affairs Division., eds. Transition metal carbyne complexes. Dordrecht: Kluwer Academic, 1993.

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Farrell, Michael A. Highly polarisable derivatives of bridging carbene and carbyne di-iron complexes. Dublin: University College Dublin, 1998.

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Gubanov, V. A. Electronic structure of refractory carbides and nitrides. Cambridge [England]: Cambridge University Press, 1994.

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Anasori, Babak, and Yury Gogotsi, eds. 2D Metal Carbides and Nitrides (MXenes). Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19026-2.

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Howard, Cottrell Alan. Chemical bonding in transition metal carbides. London: Institute of Materials, 1995.

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U, Schubert, ed. Advances in metal carbene chemistry. Dordrecht, Netherlands: Kluwer Academic Publishers, 1989.

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Book chapters on the topic "Metal carbide"

1

Tachikawa, Mamoru, and E. L. Muetterties. "Metal Carbide Clusters." In Progress in Inorganic Chemistry, 203–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470166291.ch3.

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Tilak, Vinayak. "Inversion Layer Electron Transport in 4H-SiC Metal-Oxide-Semiconductor Field-Effect Transistors." In Silicon Carbide, 267–90. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527629077.ch11.

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Reshanov, Sergey A., Konstantin V. Emtsev, Florian Speck, Kun-Yuan Gao, Thomas K. Seyller, Gerhard Pensl, and Lothar Ley. "Effect of an Intermediate Graphite Layer on the Electronic Properties of Metal/SiC Contacts." In Silicon Carbide, 35–50. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527629077.ch3.

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Hargreaves, J. S. J. "Chapter 4. Metal Carbide Catalysts." In Alternative Catalytic Materials, 71–83. Cambridge: Royal Society of Chemistry, 2018. http://dx.doi.org/10.1039/9781788013222-00071.

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Mellinger, Zachary J., and Jingguang G. Chen. "Metal-Modified Carbide Anode Electrocatalysts." In Lecture Notes in Energy, 27–42. London: Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-4911-8_2.

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Gribkov, A. N. "Composites of the aluminium—silicon carbide system." In Metal Matrix Composites, 440–86. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-1266-6_8.

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Ochoa, R., X. X. Bi, A. M. Rao, and P. C. Eklund. "Transition metal nitride and carbide nanoparticles." In The Chemistry of Transition Metal Carbides and Nitrides, 489–510. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1565-7_27.

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Leclercq, L., A. Almazouari, M. Dufour, and G. Leclercq. "Carbide-oxide interactions in bulk and supported tungsten carbide catalysts for alcohol synthesis." In The Chemistry of Transition Metal Carbides and Nitrides, 345–61. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1565-7_18.

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Liu, L. M., Song Quang Wang, and Heng Qiang Ye. "Segregation Effects on the Metal-Carbide Interface." In Materials Science Forum, 4251–54. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-960-1.4251.

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Ishizawa, Y., and T. Tanaka. "Fermi surface of hexagonal tungsten carbide." In The Chemistry of Transition Metal Carbides and Nitrides, 121–33. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-009-1565-7_6.

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Conference papers on the topic "Metal carbide"

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LAPIN, Juraj. "Cast in-situ TiAl-based matrix composites reinforced with carbide particles." In METAL 2019. TANGER Ltd., 2019. http://dx.doi.org/10.37904/metal.2019.747.

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Dyer, P. N., D. Garg, M. A. Pellman, and J. J. Sheridan. "CVD Tungsten Carbide and Titaniutm Carbide Coatings for Aerospace Components." In Annual Aerospace/Airline Plating and Metal Finishing Forum and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1989. http://dx.doi.org/10.4271/890933.

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WORASAEN, Kaweewat, Suttipong WANNAPAIBOON, Karuna TUCHINDA, and and Piyada SUWANPINIJ. "Characterization of Secondary Carbide in Martensitic Stainless Steel after Deep-Cryogenic Treatment Processes." In METAL 2019. TANGER Ltd., 2019. http://dx.doi.org/10.37904/metal.2019.715.

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PELACHOVÁ, Tatiana, and Juraj LAPIN. "Fracture initiation and propagation in in-situ TiAl matrix composite reinforced with carbide particles." In METAL 2019. TANGER Ltd., 2019. http://dx.doi.org/10.37904/metal.2019.751.

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Vitiaz, P., A. Verstak, T. Azarova, T. Talako, and E. Lugscheider. "Titanium Carbide in Wear Resistant Coatings." In ITSC 1996, edited by C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0169.

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Abstract The poblems of metal-titanium carbide coatings processing by air, low pressure and underwater plasma as well as high velocity oxygen fuel spraying are under consideration. Among the different methods of metal-TiC powders production, like mixing of carbides with scale structure metals, agglomeration with binders, a matter of special interest is the high temperature synthesis of TiC in presence of metallic alloy. The characteristic features of these materials include the carbide phases forming, their bonding with the alloy and reactions during spraying, grain size and their distribution, alloy behavior during synthesis and spraying. Finally, the abrasive wear and erosion resistance of Al-Si/TiC, Fe-Cr/TiC and Ni-Cr/TiC coatings is analyzed.
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BAGROWSKA, Magdalena, Adam GOŁASZEWSKI, and Wiesław ŚWIĄTNICKI. "The influence of Q&P parameters on carbide precipitation and mechanical properties of high-Cr martensitic steel." In METAL 2019. TANGER Ltd., 2019. http://dx.doi.org/10.37904/metal.2019.719.

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ŠTAMBORSKÁ, Michaela, Juraj LAPIN, and Oto BAJANA. "ANALYTICAL AND NUMERICAL ANALYSIS OF COMPRESSIVE DEFORMATION BEHAVIOR OF CAST IN-SITU TiAl MATRIX COMPOSITES REINFORCED WITH CARBIDE PARTICLES." In METAL 2019. TANGER Ltd., 2019. http://dx.doi.org/10.37904/metal.2019.746.

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Liang, Cai, Barton C. Prorok, Prateek Gupta, Marcin Tlustochovicz, Ranyi Zhu, and Michael McNallan. "Conversion of metal carbides to carbide derived carbon by reactive ion etching in halogen gas." In Defense and Security Symposium, edited by Thomas George and Zhong-Yang Cheng. SPIE, 2006. http://dx.doi.org/10.1117/12.665054.

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Klein, B. "Dynamic Response of Titanium Carbide-Steel, Ceramic-Metal Composites." In Shock Compression of Condensed Matter - 2001: 12th APS Topical Conference. AIP, 2002. http://dx.doi.org/10.1063/1.1483734.

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Sun, S. C., H. Y. Tsai, and S. J. Wang. "Refractory metal carbide based diffusion barriers for copper metallization." In Proceedings of the IEEE 2001 International Interconnect Technology Conference. IEEE, 2001. http://dx.doi.org/10.1109/iitc.2001.930060.

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Reports on the topic "Metal carbide"

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Speyer, Robert F. Synthesis and Processing of Ultra-High Temperature Metal Carbide and Metal Diboride Nanocomposite Materials. Fort Belvoir, VA: Defense Technical Information Center, April 2008. http://dx.doi.org/10.21236/ada483547.

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Lambrecht, Walter R. First-Principles Theory of Transition Metal Impurities in Silicon Carbide. Fort Belvoir, VA: Defense Technical Information Center, December 2000. http://dx.doi.org/10.21236/ada389332.

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Way, J. Douglas, and Colin A. Wolden. Nanoporous, Metal Carbide, Surface Diffusion Membranes for High Temperature Hydrogen Separations. Office of Scientific and Technical Information (OSTI), September 2013. http://dx.doi.org/10.2172/1121750.

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Howell, Paul R. Microstructural Development in a Spray Formed Aluminum-Silicon Carbide Based Metal Matrix Composite. Fort Belvoir, VA: Defense Technical Information Center, May 1992. http://dx.doi.org/10.21236/ada251425.

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Davis, Paul R., and William A. Mackie. Development of Transition Metal Carbide Field Emitters for Use in FEA Display Systems. Fort Belvoir, VA: Defense Technical Information Center, December 2000. http://dx.doi.org/10.21236/ada389243.

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Kang, S., J. H. Selverian, H. Kim, D. O'Niel, and K. Kim. Analytical and experimental evaluation of joining silicon nitride to metal and silicon carbide to metal for advanced heat engine applications. Office of Scientific and Technical Information (OSTI), April 1990. http://dx.doi.org/10.2172/6767279.

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Chiang, Tai C. Electronic Struture and Quantum Effects of Thin Metal Film Systems Based on Silicon Carbide. Fort Belvoir, VA: Defense Technical Information Center, May 2013. http://dx.doi.org/10.21236/ada577620.

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Griffin, Timothy E. Pulsed Capacitance Measurement of Silicon Carbide (SiC) Schottky Diode and SiC Metal Oxide Semiconductor. Fort Belvoir, VA: Defense Technical Information Center, November 2006. http://dx.doi.org/10.21236/ada458317.

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Perry, Scott S. Spectroscopic Studies of Perfluorinated Lubricants and Additive Interfacial Reactivity at Metal Carbide and Nitride Surfaces. Fort Belvoir, VA: Defense Technical Information Center, September 2000. http://dx.doi.org/10.21236/ada383270.

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Kang, S., J. Selverian, D. O`Neil, H. Kim, and K. Kim. Analytical and experimental evaluation of joining silicon nitride to metal and silicon carbide to metal for advanced heat engine applications. Final report. Office of Scientific and Technical Information (OSTI), May 1993. http://dx.doi.org/10.2172/10176461.

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