Relevant bibliographies by topics / Composites ZrC

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Academic literature on the topic 'Composites ZrC'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Composites ZrC"

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Yu, Lei, Jian Yang, and Tai Qiu. "In Situ Preparation and Mechanical Properties of (ZrB2+ZrC)/Zr3[Al(Si)]4C6 Composites." Key Engineering Materials 602-603 (March 2014): 438–42. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.438.

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Fully dense (ZrB2+ZrC)/Zr3[Al (Si)]4C6 composites with ZrB2 content varying from 0 to 15 vol.% and fixed ZrC content of 10 vol.% were successfully prepared by in situ hot-pressing in Ar atmosphere using ZrH2, Al, Si, C and B4C as raw materials. With the increase of ZrB2 content, both the bending strength and fracture toughness of the composites increase and then decrease. The synergistic action of ZrB2 and ZrC as reinforcements shows significant strengthening and toughing effect to the Zr3[Al (Si)]4C6 matrix. The composite with 10 vol.% ZrB2 shows the optimal mechanical properties: 516 MPa for bending strength and 6.52 MPa·m1/2 for fracture toughness. With the increase of ZrB2 content, the Vickers hardness of the composites shows a near-linear increase from 15.3 GPa to 16.7 GPa. The strengthening and toughening effect can be ascribed to the unique mechanical properties of ZrB2 and ZrC reinforcements, the differences in coefficient of thermal expansion and modulus between them and Zr3[Al (Si)]4C6 matrix, fine grain strengthening and uniform microstructure derived by the in situ synthesis reaction.
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Yu, Lei, Hui Liu, Kai Liang, et al. "Isothermal Oxidation Resistance of Zr3[Al(Si)]4C6-Based Composite Ceramics at 1000-1300°C in Air." Solid State Phenomena 281 (August 2018): 444–49. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.444.

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The isothermal oxidation behavior of Zr3[Al(Si)]4C6-ZrB2-ZrC composite ceramics at 1000-1300 °C in air has been investigated. The oxidation kinetics of the composites and generally follows a parabolic law. At the same oxidation temperature and time, the weight gain per unit surface area, oxidation rate constant and oxide thickness of the composites are higher than those of monolithic Zr3[Al(Si)]4C6 ceramic. With the incorporation of ZrB2 and ZrC, the oxidation resistance of the composites becomes poor. The surfaces of the oxide layer have a loose and porous structure, consisting of mainly ZrO2 and little mullite, and there are no dense oxide films preventing the inward diffusion of oxygen element effectively.
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Gao, Meng Jiao, Lai Chen, Yong Sheng Hua, Mu Su Ren, and Jin Liang Sun. "Ablation Properties of C/C-ZrC-SiC Composites." Applied Mechanics and Materials 117-119 (October 2011): 866–69. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.866.

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The ablation properties of C/C-ZrC-SiC composites prepared by precursor infiltration and pyrolysis processes were studied by the H2-O2 ablation method. The results indicate that the C/C composite of 1.28 g•cm-3 was densified to C/C-ZrC-SiC composite of 1.42 g•cm-3 after infiltration and pyrolysis once, the density increased 10.94%. The linear ablation rate and mass ablation rate of the C/C-ZrC-SiC composites (ρ=1.42g•cm-3) were 7.22μm•s-1and 3.88mg•s-1, which decreased 79.31% and 65.46% comparing with C/C composite of 1.28 g•cm-3 respectively. The introduction of ZrC-SiC into the matrix greatly enhanced the anti-oxidative and ablation property of the C/C composite. The ablation mechanisms of the C/C-ZrC-SiC composites were supposed to be the synergistic effects of thermo-chemistry ablation (oxidation and sublimation) and mechanical erosion.
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Wang, Yu Jin, Lei Chen, Tai Quan Zhang, and Yu Zhou. "Effect of Iron Additive on the Sintering Behavior of Hot-Pressed ZrC-W Composites." Key Engineering Materials 368-372 (February 2008): 1764–66. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1764.

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The ZrC-W composites with iron as sintering additive were fabricated by hot-press sintering. The densification, microstructure and mechanical properties of the composites were investigated. The incorporation of Fe beneficially promotes the densification of ZrC-W composites. The relative density of the composite sintered at 1900°C can attain 95.3%. W2C phase is also found in the ZrC-W composite sintered at 1700°C. The content of W2C decreases with the increase of sintering temperature. However, W2C phase is not identified in the composite sintered at 1900°C. The flexural strength and fracture toughness of the composites are strongly dependent on sintering temperature. The flexural strength and fracture toughness of ZrC-W composite sintered at optimized temperature of 1800°C are 438 MPa and 3.99 MPa·m1/2, respectively.
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Gao, Meng Jiao, Lai Chen, Yong Sheng Hua, et al. "Ablation Properties of C/C-ZrC-SiC Composites by the Precursor Infiltration Pyrolysis." Advanced Materials Research 239-242 (May 2011): 1076–81. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.1076.

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The ablation properties of C/C-ZrC-SiC composites prepared by precursor infiltration and pyrolysis processes were studied by the H2-O2 ablation method. The results indicate that the ablation rate of C/C-ZrC-SiC composites decreases with increasing density of the composites. The linear ablation rate and mass ablation rate of the C/C-ZrC-SiC composites (ρ=1.69g·cm-3) were 0.00211mm·s-1 and 0.5179mg·s-1, only 20.6% and 31.6% of those of C/C composites (ρ=1.78g·cm-3) respectively. The introduction of ZrC-SiC into the matrix greatly enhanced the anti-oxidative and ablation property of the C/C composite. The ablation mechanisms of the C/C-ZrC-SiC composites were supposed to be the synergistic effects of thermo-chemistry ablation (oxidation and sublimation) and mechanical erosion.
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Wu, Wen Wen, Guo Jun Zhang, Yan Mei Kan, and Pei Ling Wang. "Reactive Synthesis and Mechanical Properties of ZrB2-SiC-ZrC Composites." Key Engineering Materials 368-372 (February 2008): 1758–60. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1758.

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ZrB2-SiC based composites with 0,5 and 15 vol% addition of ZrC were synthesized via reactive hot pressing at 1800°C using Zr, Si and B4C as raw materials. The mechanical properties of the composites were investigated. The composite of ZSC15 that contained 15 vol% of ZrC has the highest hardness. ZSC5 with 5 vol% of ZrC owns a most homogenous microstructure and the highest fracture toughness and flexural strength.
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Yang, Lu Ping, Yang Wang, Kai Jiang, et al. "The Preparation of Cf/ SiC-ZrC Composite Material by Adding SiC and ZrC Powders in Organic Precursors." Solid State Phenomena 281 (August 2018): 432–37. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.432.

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In this paper, we added inert filler SiC and ZrC powders in an organic precursor solution to prepare Cf/SiC-ZrC composites. The experiments of three different contents of slurry in the process of impregnation and pyrolysis for Cf/SiC-ZrC composites were studied. The microstructure and composition of Cf/SiC-ZrC composites were analyzed by scanning electron microscope (SEM) equipped with EDS. This study shows that the addition of inorganic powders in an organic precursor solution can shorten the period of preparation of the composite material and improve its strength. When the mass fraction of the inert filler is 15% in an organic precursor solution, the density of the composite material can be increased to 1.9 g·cm-3 rapidly in 8 periods of preparation. Meanwhile, the internal structure of the prepared composite material becomes more compact, and its mechanical properties are excellent.
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Kang, Bo, Ho Kim, Phil Oh, Jung Lee, Hyung Lee, and Seong Hong. "Characteristics of ZrC Barrier Coating on SiC-Coated Carbon/Carbon Composite Developed by Thermal Spray Process." Materials 12, no. 5 (2019): 747. http://dx.doi.org/10.3390/ma12050747.

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A thick ZrC layer was successfully coated on top of a SiC buffer layer on carbon/carbon (C/C) composites by vacuum plasma spray (VPS) technology to improve the ablation resistance of the C/C composites. An optimal ZrC coating condition was determined by controlling the discharge current. The ZrC layers were more than 70 µm thick and were rapidly coated under all spraying conditions. The ablation resistance and the oxidation resistance of the coated layer were evaluated in supersonic flames at a temperature exceeding 2000 °C. The mass and linear ablation rate of the ZrC-coated C/C composites increased by 2.7% and 0.4%, respectively. During flame exposure, no recession was observed in the C/C composite. It was demonstrated that the ZrC coating layer can fully protect the C/C composites from oxidation and ablation.
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Ma, B., X. Zhang, J. Han, and W. Han. "Fabrication of hot-pressed ZrC-based composites." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 223, no. 8 (2009): 1153–57. http://dx.doi.org/10.1243/09544100jaero483.

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In this work, ZrC-based composites reinforced with SiC particles were processed using the hot-pressing route. The influence of SiC content on the microstructure and mechanical properties of the hot-pressed composites was investigated. In all composites with different SiC contents, the highest relative density was obtained for ZrC-based composite containing 20 vol% SiC, having a value of 97 per cent. The flexural strength of ZrC-based composites increased modestly from 390 to 452 MPa as the SiC content increased from 10 to 20 vol%. The increase in strength was attributed to a decrease in grain size and improvement of the relative density. But the strength did not show great variation when the content of the SiC particles increased to 30 vol%, which may be because of the inhomogeneous microstructure and the low relative density. In contrast, toughness and hardness did not vary significantly with SiC content.
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Sha, Jianjun, Shouhao Wang, Jixiang Dai, Yufei Zu, Wenqiang Li, and Ruyi Sha. "High-temperature Mechanical Properties and Their Influence Mechanisms of ZrC-Modified C-SiC Ceramic Matrix Composites up to 1600 °C." Materials 13, no. 7 (2020): 1581. http://dx.doi.org/10.3390/ma13071581.

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In order to understand the influence of the mechanisms of ZrC nanoparticles on the high-temperature mechanical properties of C-SiC ceramic matrix composites, the mechanical properties were measured from room temperature (RT) to 1600 °C under vacuum. The microstructures features were characterized by scanning electron microscopy. In comparison with the composites without ZrC nanoparticles, the ZrC-modified composite presented better mechanical properties at all temperatures, indicating that the mechanical properties could be improved by the ZrC nanoparticles. The ZrC nanoparticles could reduce the residual silicon and improve the microstructure integrity of composite. Furthermore, the variation of flexural strength and the flexural modulus showed an asynchronous trend with the increase of temperature. The flexural strength reached the maximum value at 1200 °C, but the highest elastic modulus was obtained at 800 °C. The strength increase was ascribed to the decrease of the thermally-induced residual stresses. The degradation of mechanical properties was observed at 1600 °C because of the microstructure deterioration and the formation of strongly bonded fiber–matrix interface. Therefore, it is concluded that the high temperature mechanical properties under vacuum were related to the consisting phase, the matrix microstructure, and the thermally-induced residual stresses.
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Dissertations / Theses on the topic "Composites ZrC"

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Bouzat, Fabien. "Elaboration des composites SiC/ZrC par synthèse organométallique et par différentes voies de pyrolyse." Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0130/document.

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Dans le domaine des matériaux de structure destinés à des applications thermomécaniques sous conditions extrêmes, les carbures métalliques et, plus particulièrement, ceux de la famille de métaux de transition (i.e. titane, zirconium, hafnium) sont de bons candidats étant donné la nature à la fois métallique et covalente de leurs liaisons. De plus, parmi les céramiques non-oxydes, le carbure de silicium est le plus employé dans la réalisation de composites particulaires du fait de son bon comportement à l’oxydation à haute température. Les composites de type SiC/ZrC seraient de bons candidats pour des applications à haute température dans des atmosphères oxydantes car ils sont susceptibles de développer des propriétés thermostructurales intéressantes. Cependant, l’élaboration de composites particulaires, avec un bon contrôle de la distribution respective des deux phases carbures au sein de la microstructure, n’est pas parfaitement maîtrisée. En particulier, l’amélioration ou l’optimisation des performances thermomécaniques de ces céramiques avancées, exige le contrôle de leur composition chimique à l’échelle atomique et de leur nanostructuration. L’approche « Precursor Derived Ceramics » (PDCs) permet notamment de moduler la composition du matériau à l’échelle moléculaire et d’obtenir des matériaux de formes diverses et complexes (nanomatériaux, fibres, dépôts, composites). Cette méthode, appliquée au système Si/C/Zr, est basée sur la synthèse de polymères précéramiques par chimie click et hydrosilylation. Des poudres ultrafines obtenues après le traitement thermique par spray pyrolyse laser des précurseurs pourront suivre des étapes ultimes de mise en forme, de consolidation et de densification<br>In the field of structural materials for thermomechanical applications under extreme conditions, metal carbides, and more specifically, those of the transition metal family (i.e. titanium, zirconium, hafnium) are good candidates thanks to the nature of the both metallic and covalent bonds. Further, among the non-oxide ceramics, silicon carbide is the most used in the elaboration of particulate composites because of its good oxidation behavior at high temperature. SiC/ZrC composites would be good candidates for high temperature applications in oxidizing atmospheres thanks to their ability to develop interesting thermostructural properties. However, the development of particulate composites, with good control of the respective distribution of the two carbides phases in the microstructure is not well controlled. Particularly, improving or optimizing the thermomechanical performances of these advanced ceramics, requires to control the chemical composition at the atomic scale and their nanostructuration. The "Precursor Derived Ceramics" approach (PDCs) notably allows to modulate the composition of the material at the molecular level and to obtain materials of various and complex shapes (nanomaterials, fibers, deposits, composites). This method, applied to the Si/C/Zr system is based on the synthesis ofpreceramic polymers by click chemistry and hydrosilylation. Ultrafine powders obtained after laser spray pyrolysis heat treatment could be shaped, consolidated and densified
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Laadoua, Hatim. "Impact de l'utilisation de polycarbosilane dans l'élaboration de composites ZrC/SiC par frittage SPS." Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0098.

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Ces travaux de thèse ont été axés sur l’étude de l’impact de l’ajout d’un polycarbosilane comme source de SiC dans l’élaboration des composites ZrC/SiC par frittage SPS. L’enjeu principal de cette étude réside dans l’obtention de composites denses avec une distribution fine et homogène de la phase SiC au sein de la matrice ZrC. Pour ce faire, deux systèmes ZrC/polymère et ZrC fonctionnalisée/polymère ont été préparés en utilisant une voie dite « hybride ». Dans les deux cas de figure, les caractérisations microstructurales (MEB, MET) et chimiques (XPS) ont montré des similitudes avec la présence du polymère qui enrobe de manière homogène les particules de ZrC. La densification des deux systèmes a été entreprise par frittage SPS. Cette étape du procédé a nécessité la mise en place d’un traitement thermique de conversion/frittage spécifique qui a permis, après optimisation, d’obtenir des composites denses (ρrelative &gt; 96%) a relativement basse température (1700 °C). L’impact de l’utilisation d’un polycarbosilane a été mis en exergue à travers une étude comparative avec un composite préparé à partir d’un mélange de poudres ZrC et SiC. Afin de compléter ces travaux, une étude à haute résolution des joints de grains par MET a montré des disparités suivant la fonctionnalisation ou non de la surface des poudres de ZrC<br>This work focused on studying the impact of the addition of a polycarbosilane as SiC source in the production of ZrC / SiC composites by SPS sintering. The main challenge of this study lies in producing dense composites with a fine and homogeneous distribution of the SiC phase within the ZrC matrix. For this, two systems ZrC/polymer and ZrC functionalized/polymer were prepared using a so-called "hybrid" route. In both cases, the microstructural (SEM, TEM) and chemical (XPS) characterizations showed similarities with the presence of ZrC particles coated homogeneously by the polymer. The densification of the two systems was undertaken by SPS sintering. This step of the process required the implementation of a specific conversion/sintering heat treatment which, after optimization, made it possible to obtain dense composites (ρrelative &gt; 96%) at relatively low temperatures (1700 ° C). The impact of using a polycarbosilane was highlighted through a comparative study with a composite prepared from a mixture of ZrC and SiC powders. To complete this work, a high resolution study of grain boundaries by TEM showed disparities depending on the functionalization or not of the surface of ZrC powders
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Quet, Aurélie. "Composites de friction à matrice céramique : relation composition / structure / comportement tribologique." Bordeaux 1, 2007. http://www.theses.fr/2007BOR13512.

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Les composites C/C sont acutellement les matériaux les mieux adaptés aux exigences du freinage aéronautique. Ils présentent cependant un taux d'usure accru pour les freinages de taxiage. Les composites à matrice SiC se caractérisent par un lissage de cette bosse d'usure observée aux basses températures mais ils ne satisfont pas aux exigences du freinage de détresse. L'objectif de la thèse est d'introduire un autre carbure que le SiC dans la matrice des composites de friction et d'évaluer son influence sur le comportement tribologique des composites élaborés. Des composites C/C-ZrC et C/CTiC ont ainsi été élaborés via le procédé RMI (Reactive Melt Infiltration). Ces matériaux ont été caractérisés à travers des analyses morphologiques, chimiques et structurales. Une décohésion est présente à l'interface matrice de carbone/carbure. L'utilisation d'alliages, notamment à base de silicium, permet de limiter ce phénomène de décohésion. Les matériaux éléborés ont ensuite été testés sur un banc de simulation de freinage. Les composites C/C-ZrC e C/CTiC satisfont les conditions du RTO. Cependant, les composites à matrices ZrC montrent une usure très élevée à haute température en relation avec leur comportement à l'oxydation. Les composites à matrice TiC présentent une usure acceptable à haute température et une troncature de la bosse d'usure observée aux faibles températures, ce qui est lié à des coefficents de frottement faibles<br>C/C composites are nowadays the most suitable materials for needs of aircraft braking. However, they show a high wear during taxiing. SiC matrix composites are characterised by a smoothing of the wear peak noticed at low temperatures but they don't meet requirements of rejected take-off (RTO). The aim of this work is to put another carbide than SiC in the matrix of friction composites and to assess its influence on tribological properties of materials. C/C-ZrC and C/C-TiC composites were manufactured using RMI processing route (Reactive Melt Infiltration). Materials were characterised with mophological, chemical and structural analysis which reveal especially a decohesion between carbon phase and carbide phase. This gap can be limited using alloys as Zr-Si and Ti-Si alloys. Triboligical behaviour of the resulting materials was then investigated with an inertial dynamometer simulating brake stops. C/C-ZrC and C/C-TiC composites meet RTO requirements. Neverless, ZrC matrix composites have a high wear for high temperature brake stops linked to their oxidation behaviour. TiC matrix composites present moderate wear at high temperature and a lower wear at low temperature compared to C/C composites in relation to low friction coefficients
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Allemand, Alexandre. "Céramiques et composites pour applications en conditions extrêmes dans le nucléaire et le spatial." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0967/document.

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Le présent document obéit à un plan strict inhérent à tous les manuscrits de thèsepassée en Validation des Acquis de l’Expérience (VAE). Après un CV détaillé ledocument présente tout d’abord un retour réflexif sur le parcours professionnel c'està-dire, une synthèse sur les taches effectuées d’un travail de type projet vers uneimplication de plus en plus forte vers un travail de recherche à proprement parlé. Aprèsce retour réflexif qui permet d’avoir une vue d’ensemble de la progression du parcours,une synthèse est proposée, non pas de la totalité des travaux, mais de trois domainesbien précis et représentatifs du parcours de recherche. Ce choix s’est fait en cherchantun fil d’Ariane qui est tout simplement la nature chimique de la céramique étudiée ;dans le présent document il s’agit de carbures et plus précisément de SiC, TiC, ZrC,HfC. Tout d’abord le travail sur les céramiques monolithiques pour les applicationsnucléaires est abordé puis, les applications spatiales avec la mise au point deprotections contre l’oxydation à partir de poudres revêtues enfin, le document s’achèvepar des travaux d’infiltration de céramiques à partir d’un matériau intermétallique oucomment il est possible de faire des céramiques ultra réfractaires à basse température.Ces travaux étant originaux ils ont fait l’objet de brevets et de publications qui serontabordés dans la troisième partie<br>This document obeys a strict plan inherent in all PhD manuscripts passed in Validationof the Assets of Experiment (VAE). After a detailed resume this document first of all,presents a reflexive return on the career i.e., from a work of type project towards anincreasingly strong implication to a research task. After this reflexive return whichmakes it possible to have an overall picture of the progression of the course, asynthesis is proposed, not of total work, but of three fields quite precise andrepresentative of the course of research. This choice was done by seeking a wire ofARIANE which is the chemical nature of the studied ceramics; in this document it isabout carbides and more precisely about SiC, TiC, ZrC, HfC. First of all monolithicceramics for the nuclear applications is approached then, the space applications withthe elaborating of protections against oxidation made by core shell powders finally, thedocument is completed by ceramics infiltrations from an intermetallic material or howit is possible to make ultra refractory ceramics at low temperature. As these works areoriginal they were the object of patents and publications which will be approached inthe third part
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Xie, Yanli. "Solution-based synthesis and processing of nanocrystalline ZrB₂-based composites." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26640.

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Thesis (Ph.D)--Materials Science and Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Speyer, Robert; Committee Co-Chair: Sanders, Thomas; Committee Member: Gerhardt, Rosario; Committee Member: Sandhage, Kenneth; Committee Member: Snyder, Robert; Committee Member: Zhang, John. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Berthon-Fabry, Sandrine. "Synthèse de composites C/ZrB₂ par CVI : propriétés thermo-physiques à hautes températures." Bordeaux 1, 1994. http://www.theses.fr/1994BOR10573.

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Le systeme chimique heterogene zrbhcl a ete etudie, a ete etudie, a basse temperature et a basse pression, theoriquement et experimentalement. Les vecteurs gazeux utilises sont zrcl#4, bcl#3 et h#2. Une etude thermodynamique previsionnelle realisee a basse temperature a mis en evidence l'influence des parametres sur les rendements des phases solides zrb#2 et b des diagrammes donnant les domaines de depot des phases solides ont ete etablis. L'ajout d'un gaz neutre dans le systeme provoque l'augmentation du rendement de zr/b#2. Ces previsions, en accord avec les resultats d'essais sur substrats denses, ont permis de determiner un domaine experimental a priori favorable a l'infiltration. L'etude experimentale de densification de preformes poreuses repose sur la technique d'infiltration en phase gazeuse isotherme-isobare. La realisation d'un plan experimental rationnel a permis de determiner l'importance et le sens de l'influence des parametres sur l'infiltration du diborure de zirconium dans des pores modeles de differentes tailles. Dans la gamme parametrique exploree, le debit total et la temperature ont un role primordial sur la qualite de la densification. L'influence positive d'une faible dilution d'helium sur la cinetique et la morphologie des depots a ete mise en evidence. La qualite et la vitesse de l'infiltration ainsi qu'un compromis necessaire entre ces deux facteurs, ont ete quantifies dans l'optique d'une elaboration industrielle. Une application a la densification de preformes poreuses a base de fibres de carbone a ete realisee. L'evolution de la densification a ete suivie au cours du temps. Des determinations de proprietes thermo-physiques de couches et de composites de zrb#2 ont ete faites et des correlations avec les etats de surface ou de volume des materiaux ont ete degagees. L'emissivite spectrale directionnelle diminue lorsque la rugosite de surface du materiau s'accroit et augmente au cours de l'oxydation de zrb#2. Les proprietes de volume comme la conductivite et la diffusivite thermique de composites ont ete mesurees a des taux d'infiltration differents et comparees a celles de composites c/sic
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Santos, Rafaela Luiz Pereira. "Study of porcelain-zirconia composites for dental applications." Universidade Federal do Rio Grande do Norte, 2016. http://repositorio.ufrn.br/handle/123456789/21003.

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Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-20T21:46:40Z No. of bitstreams: 1 RafaelaLuizPereiraSantos_TESE.pdf: 5717758 bytes, checksum: 765e67dde7c80007f582df680380b1c9 (MD5)<br>Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-21T19:39:57Z (GMT) No. of bitstreams: 1 RafaelaLuizPereiraSantos_TESE.pdf: 5717758 bytes, checksum: 765e67dde7c80007f582df680380b1c9 (MD5)<br>Made available in DSpace on 2016-07-21T19:39:57Z (GMT). No. of bitstreams: 1 RafaelaLuizPereiraSantos_TESE.pdf: 5717758 bytes, checksum: 765e67dde7c80007f582df680380b1c9 (MD5) Previous issue date: 2016-01-22<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)<br>All-ceramic restorations have been widely used as aesthetic standard in nowadays dentistry, to replace the tooth structure (appearance and function). However, failures associated with chipping and delamination of the veneering porcelain from zirconia substructure still high when compared to metal-ceramic systems. This study aimed address these problems by improving the mechanical strength of veneering porcelain and by improving its adhesion to zirconia substrate. First, the addition of a stronger ceramic second phase (zirconia particles) to feldspathic porcelain was studied. This study began with the preliminary characterization of zirconia synthesized by Complex Polymerization Method (CPM) and commercial zirconia. It was found that the synthesized zirconia did not show improved properties when compared to commercial zirconia. Commercial zirconia powders were thus used thereafter. The influence of the type of powder (pre-sintered or agglomerated) in the mechanical properties and wear of porcelain composites (20vol.%) was evaluated. The pre-sintered powders increased the mechanical strength and wear of the composites compared to agglomerated powders. Then, it was determined the amount of second phase (0-50vol.%) that maximizes the mechanical properties of the porcelain-zirconia composites. It was concluded that the composites with 30vol.% of zirconia showed the best results for wear and flexural strength (198.5MPa). Finally, it was evaluated the influence of the type of surface treatment (sandblasting or holes) and the deposition of a composite interlayer (porcelain reinforced with 30vol.% of zirconia), on the zirconia surface, on the bond strength between the veneering porcelain and the zirconia substructure. The highest bond strength values were found for specimens having simultaneously holes on the surface of zirconia and the composite interlayer between the zirconia substructure and the veneering porcelain (138 ? 19MPa). It was demonstrated that the correct configuration of the interface between the zirconia substructure and the veneering porcelain can lead to all-ceramic restorations with enhanced mechanical strength and improved clinical performance.<br>Materiais comp?sitos restauradores representam um dos mais bem sucedidos biomateriais na pesquisa moderna, na substitui??o do tecido biol?gico em apar?ncia e fun??o. Nesta linha, a porcelana feldsp?tica tem sido largamente usada em odontologia devido suas interessantes qualidades como estabilidade de cor, propriedades est?ticas, elevada durabilidade mec?nica, biocompatibilidade, baixa condutividade t?rmica e elevada resist?ncia ao desgaste. Entretanto, este material ? fr?gil e pode falhar em ambiente oral devido ao micro-vazamento, baixa resist?ncia ? tra??o, descolagem ou fratura. Assim, para melhorar as propriedades mec?nicas da porcelana, a zirc?nia parcialmente estabilizada com ?tria (Y-TZP) pode ser uma boa alternativa para fortalecer e produzir infraestruturas totalmente cer?micas (coroas e pr?teses parciais fixas). Portanto, este estudo tem por objetivo avaliar as propriedades mec?nicas e caracter?sticas microestruturais da porcelana refor?ada com zirc?nia (3Y-TZP) em diferentes conte?dos e as vari?veis que afetam as propriedades mec?nicas destes materiais. O estudo de caracteriza??o revelou que a zirc?nia comercial apresenta melhores resultados quando comparada com a zirc?nia sintetizada pelo CPM. Assim, os estudos seguintes utilizaram a zirc?nia comercial para todos os testes requeridos. As part?culas de zirc?nia apresentam elevadas propriedades mec?nicas quando comparadas a zirc?nia aglomerada. Os diferentes conte?dos revelam que as propriedades mec?nicas dos comp?sitos aumentam com o aumento do conte?do volum?trico at? 30% vol.% (198,5Mpa), ou seja, maior resist?ncia ? flex?o quando comparada com os outros comp?sitos. Do mesmo modo, a resist?ncia ao desgaste para os comp?sitos com (30%, vol.% de zirc?nia) apresenta valores superiores quando comparado aos demais comp?sitos. Na ades?o cer?mico-cer?mico a porcelana exibe elevada ades?o para a superf?cie de zirc?nia porosa quando comparada a superf?cie rugosa. Os furos superficiais (PZ) e aplica??o de comp?sitos com camada intermedi?ria (RZI) na zirc?nia causam separadamente uma melhoria da resist?ncia ao cisalhamento da zirc?nia-porcelana quando comparados as amostras convencionais de zirc?nia-porcelana (RZ), embora n?o sejam estatisticamente significativas (p>0.05). A presen?a de uma camada intermediaria produz um aumento significativo na for?a de liga??o (~55%) em rela??o as amostras convencionais (RZ). Portanto, a correta a correta configura??o e tratamento superficial podem produzir subestruturas com qualidade e for?a de liga??o adequadas aos requisitos odontol?gicos.
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Tilton, Gregory J. "Finite Element Modeling of Thermal Expansion in Polymer/ZrW2O8 Composites." University of Toledo / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1321465255.

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Dick, Sami. "Préparation et propriétés de céramiques composites dans le système Al - Zr - Ce - O." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376131922.

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Dick, Sami. "Preparation et proprietes de ceramiques composites dans le systeme al-zr-ce-o." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13154.

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La dispersion d'inclusions de zro::(2) dans une matrice d'al::(2)o::(3) permet d'ameliorer certaines proprietes mecaniques de la ceramique. Des materiaux a base de al::(2)o::(3)-zro::(2)-ceo::(2) ont ete prepares par fusion ou frittage. La fusion en atmosphere reductrice conduit a la disparition d'une partie de al::(2)o::(3) et zro::(2) sous forme d'aluminate et de zirconate de ce, ce qui degrade les proprietes mecaniques. Le frittage a ete realise sur des poudres obtenues par coprecipitation ou par procede sol-gel. La coprecipitation par nh::(4)oh a conduit a des melanges homogenes et densifies a plus de 94% a une temperature de frittage (1250**(o)c) relativement faible. La preparation par voie sol-gel a permis de controler dans certains cas la morphologie et la taille des particules. Les ceramiques elaborees par ce procedelta e ont presente une mauvaise frittabilite meme aux alentours de 1400**(o)c
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Books on the topic "Composites ZrC"

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Zr-containing 4,4'-ODA/PMDA polyimide composites. National Aeronautics and Space Administration, Glenn Research Center, 2001.

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Zr-containing 4,4'-ODA/PMDA polyimide composites. National Aeronautics and Space Administration, Glenn Research Center, 2001.

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L, Illingsworth M., and NASA Glenn Research Center, eds. Zr-containing 4,4'-ODA/PMDA polyimide composites. National Aeronautics and Space Administration, Glenn Research Center, 2001.

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Book chapters on the topic "Composites ZrC"

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Ishigaki, Takamasa, Kimitoshi Sato, Yusuke Moriyoshi, Tadao Sato, and Toshikazu Sakai. "Sintering of ZrC-Al2O3 Composites." In Sintering ’87. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1373-8_76.

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Sagdic, Sumbule, Ipek Akin, Filiz Sahin, Onuralp Yücel, and Gultekin Goller. "Mechanical Properties of Spark Plasma Sintered ZrC-SiC Composites." In Supplemental Proceedings. John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118356074.ch73.

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Wu, Wen Wen, Guo Jun Zhang, Yan Mei Kan, and Pei Ling Wang. "Reactive Synthesis and Mechanical Properties of ZrB2-SiC-ZrC Composites." In High-Performance Ceramics V. Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.1758.

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Dai, J. X., J. J. Sha, Y. F. Zu, J. Q. Shao, S. H. Wang, and M. K. Lei. "Fabrication and Mechanical Properties of ZrC-Modified C/C-SiC Composites." In Ceramic Transactions Series. John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119407270.ch7.

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Zou, Linhua, Sergey Prikhodko, Timothy Stewart, Brian Williams, and Jenn-Ming Yang. "Microstructural Analysis of a Cf/ZrC Composites Produced by Melt Infiltration." In Advanced Ceramic Coatings and Materials for Extreme Environments II. John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118217474.ch17.

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Li, Guo-dong, Min Wu, Xiang Xiong, Ya-lei Wang, and Gang-yi Yang. "Preparation and Ablation Properties of ZrC-TaC CO-Deposition Coating for Carbon-Carbon Composites." In Ceramic Transactions Series. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118932995.ch65.

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Wang, Yu Jin, Lei Chen, Tai Quan Zhang, and Yu Zhou. "Effect of Iron Additive on the Sintering Behavior of Hot-Pressed ZrC-W Composites." In High-Performance Ceramics V. Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.1764.

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Song, G. M., Q. Xu, W. G. Sloof, S. B. Li, and S. van der Zwaag. "Toughening of a ZrC Particle-Reinforced Ti3AIC2 Composite." In Mechanical Properties and Processing of Ceramic Binary, Ternary, and Composite Systems. John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470456361.ch4.

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Salehi, Sedigheh, Omer Vander Biest, and Jozef Vleugels. "ZrO2-TiN Composites." In Materials Science Forum. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-439-1.135.

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Wu, Shoujun, Yiguang Wang, and Danming Gui. "Synthesis of ZrC-ZrB2 Composite Powders by Pirac Method." In Ceramic Transactions Series. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118932995.ch62.

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Conference papers on the topic "Composites ZrC"

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Mirovoy, Yu A., A. G. Burlachenko, and S. P. Buyakova. "Effects of low-modulus carbon additives on physical properties of ZrC/C heteromodulus composites." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON PHYSICAL MESOMECHANICS. MATERIALS WITH MULTILEVEL HIERARCHICAL STRUCTURE AND INTELLIGENT MANUFACTURING TECHNOLOGY. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0034079.

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Neel, Christopher, Naresh Thadhani, Mark Elert та ін. "SHOCK HUGONIOT OF COMPOSITES OF THV POLYMER MATRIX WITH 25 VOL.% 10 μM Al[sub 2]O[sub 3] OR ZrC PARTICLES". У SHOCK COMPRESSION OF CONDENSED MATTER 2009: Proceedings of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP, 2009. http://dx.doi.org/10.1063/1.3295033.

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Bestaoui-Spurr, Naima, Todd Adams, Christopher Rhodes, C. A. Edmondson, J. J. Fontanella, and M. C. Wintersgill. "Polymer Nanocomposites for High Energy Storage Capacitors." In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3900.

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The dielectric properties of a composite system based on polyimide filled with zirconium orthophosphate, ZrO(H2PO4)2·xH2O (ZrP), layered materials has been studied. The dielectric constant and loss of the polyimide/filler were studied over a broad range of frequencies and volume fractions of the layered filler. The dielectric breakdown strengths of the composite films were determined, and an analysis was carried out using a Weibull distribution. The dielectric constant and loss for the composite increase with increasing loading of the layered compound, and water contributes to both the dielectric constant and loss. The dielectric strength exhibits a maximum at a loading of about 5 wt-%, and the effect of water is to decrease the dielectric strength.
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Plumlee, Kevin G., and Christian J. Schwartz. "UHMWPE Composites for Orthopaedic Applications: A New Paradigm." In ASME/STLE 2009 International Joint Tribology Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/ijtc2009-15075.

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The authors investigated the viability of UHMWPE composites for use in orthopaedic bearing applications as an alternative to crosslinking. Two composite systems were used, both based on a UHMWPE matrix: PtZr quasicrystals and Zr particle fillers. Through wear testing and impact toughness measurement it was shown that these two fillers produced composites that had high wear resistance and more impact toughness than the crosslinked polymer. These results suggest that further investigation into the use of composites for implant bearing surfaces is warranted and that appropriate criteria for filler materials must be developed to spur development of longer-lasting devices.
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Zhang, Qingmao, Jinjiang He, Sen Yang, Minlin Zhong, and Wenjin Liu. "Microstructural characteristics of ZrC-reinforced composite coating produced by laser cladding." In ICALEO® 2001: Proceedings of the Laser Materials Processing Conference and Laser Microfabrication Conference. Laser Institute of America, 2001. http://dx.doi.org/10.2351/1.5059917.

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Mirovoy, Yu A., A. G. Burlachenko, and S. P. Buyakova. "OBTAINING OF HETEROMODULUS ZRC-BASED COMPOSITE MATERIALS, THEIR STRUCTURE AND PROPERTIES." In International Workshop "Multiscale Biomechanics and Tribology of Inorganic and Organic Systems" ; Mezhdunarodnaja konferencija "Perspektivnye materialy s ierarhicheskoj strukturoj dlja novyh tehnologij i nadezhnyh konstrukcij" ; VIII Vserossijskaja nauchno-prakticheskaja konferencija s mezhdunarodnym uchastiem, posvjashhennaja 50-letiju osnovanija Instituta himii nefti "Dobycha, podgotovka, transport nefti i gaza". Tomsk State University, 2019. http://dx.doi.org/10.17223/9785946218412/272.

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Mirovoy, Yu A., A. G. Burlachenko, and S. P. Buyakova. "Obtaining of heteromodulus ZrC-based composite materials, their structure and properties." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5132094.

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Zhenting Wang, Gang Liang, and Guogang Zhao. "Microstructure and wear resistance of in-situ ZrC/Ni composite coating by argon arc cladding." In 2011 6th International Forum on Strategic Technology (IFOST). IEEE, 2011. http://dx.doi.org/10.1109/ifost.2011.6020981.

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Baghchesara, M. A., H. R. Baharvandi, and H. Abdizadeh. "Investigation on mechanical properties and surfaces fracture of Al/ZrO 2 composite." In International Conference on Smart Materials and Nanotechnology in Engineering. SPIE, 2007. http://dx.doi.org/10.1117/12.791737.

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Rozana, Kharistya, and Muzakky. "Composite SiO2-ZrO2 of the side results of zirconium oxychloride (ZOC) processing." In 3RD INTERNATIONAL CONFERENCE ON CHEMISTRY, CHEMICAL PROCESS AND ENGINEERING (IC3PE). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0062341.

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Reports on the topic "Composites ZrC"

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Sandhage, Ken H. Fabrication of Dense, Near Net-Shaped W/ZrC Composites by the PRIMA-DCP Process. Defense Technical Information Center, 2004. http://dx.doi.org/10.21236/ada424454.

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MECHOLSKY, JR JOHN J. Report on the Fracture Analysis of HfB{sub 2}-SiC and ZrB{sub 2}-SiC Composites. Office of Scientific and Technical Information (OSTI), 2001. http://dx.doi.org/10.2172/789253.

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