Дисертації з теми "E. Reactive infiltration"
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San, Marchi Christopher William. "Processing of aluminum-nickel intermetallics by reactive infiltration." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43369.
Повний текст джерелаIncludes bibliographical references (p. 107-111).
by Christopher William San Marchi.
Ph.D.
Ventakesh, T. A. 1970. "Reactive infiltration processing and compression creep of NiAl and NiAl composites." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50458.
Повний текст джерелаIncludes bibliographical references (p. 116-118).
Reactive infiltration processing of bulk and composite NiAl was investigated with powder and wire preforms of nickel. Inhomogeneous microstructures were often obtained with powder preforms because their high surface-to-volume ratio, low permeability, and irregular infiltration paths lead to simultaneous infiltration and reaction. Homogenous NiAl could be obtained with nickel-wire preforms which had a lower surface-to-volume ratio, higher permeability, and regular infiltration paths, because infiltration was completed before the onset of reaction. Composites with continuous tungsten (W) and sapphire fibers were also successfully fabricated by reactive infiltration, while composites with molybdenum particulates and short-fibers showed significant dissolution in NiAl. The high-temperature uni-axial compression creep behavior of uni-directionally reinforced continuous fiber composite materials was investigated using NiAl-W as a model system for the case where both the NiAl matrix and the W fiber underwent plastic deformation by creep. The creep behavior of the constituents NiAl and W and NiAl composites reinforced with 5-20 volume % W was characterized at 1025 °C and 715 °C. At 1025°C, the NiAl-W composites exhibited three stage creep behavior with distinct primary, secondary, and tertiary creep, wherein the composite creep-rate decreased monotonically, remained constant, and increased rapidly, respectively. At 715C, the NiAl-W composites exhibited insignificant primary and tertiary creep but significant secondary creep. Microstructurally, primary and secondary creep were characterized by pure uni-axial compression of W fibers while brooming, bulging, buckling, and kinking were four fiber deformation modes that contributed to tertiary creep. The composite primary creep was modeled by solving for transient stress-states while loads transferred from the weaker phase (matrix) to the stronger phase (fiber) as the composite transitioned from the elastic state present at loading to steady-states attained at later times. The effects of primary creep of the constituents on the primary creep of the composite were also captured. Composite primary creep strains were predicted to be significant at high applied composite stresses and for high fiber volume fraction composites, while the composite primary time was uniquely related to the composite steady-state creep-rate by a power-law at a given temperature and for the stress range investigated. Good correlation between the primary creep model predictions and experiments was obtained when the observed composite steady-state creep behavior converged to the McLean steady-state. The composite secondary creep was observed to correlate reasonably well with the rule-of-mixtures model developed by McLean. The composite tertiary creep was modeled by solving for global or local kink-band evolution with composite deformation respectively contributing to fiber buckling or kinking. The model predicted the critical threshold strain for the onset of tertiary stage to be most sensitive to the initial kink angles while being relatively insensitive to the initial kink-band heights and varied inversely with the volume fraction of fiber in the composite. Reasonable correlation between the model and experiments was obtained when the observed composite steady-state correlated well with the McLean steady-state.
by T.A. Venkatesh.
Ph.D.
Caccia, Mario. "Synthesis and Processing of SiC-based Composite Materials by Reactive Infiltration." Doctoral thesis, Universidad de Alicante, 2016. http://hdl.handle.net/10045/72732.
Повний текст джерелаZHOU, HONG. "KINETICS, PROCESSING, AND PROPERTIES OF Si/SiC COMPOSITES FABRICATED BY REACTIVE-MELT INFILTRATION." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin994941745.
Повний текст джерелаKütemeyer, Marius [Verfasser], and D. [Akademischer Betreuer] Koch. "Development of Ultra High Temperature Matrix Composites using a Reactive Melt Infiltration Process / Marius Kütemeyer ; Betreuer: D. Koch." Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1230475699/34.
Повний текст джерелаFatehi, Pouladi Soheil. "Phosphorus Removal from Domestic Wastewater Using Dual Reactive Materials Polonite® and Absol®." Thesis, KTH, Miljögeokemi och ekoteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-95429.
Повний текст джерелаValhondo, Cristina. "A reactive barrier to enhance the removal of emerging organic compounds during artificial recharge of aquifers through infiltration basins." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/405794.
Повний текст джерелаLa recarga artificial de acuíferos a través de balsas de infiltración (AR) mejora la calidad del agua y aumenta recursos de aguas subterráneas, convirtiéndola en una técnica apropiada para la renaturalización de las aguas afectadas directa o indirectamente por los efluentes de aguas residuales. En este tipo de aguas la presencia de compuestos orgánicos emergentes (EOCs) es más que frecuente. Durante la recarga artificial este tipo de compuestos es eliminado principalmente debido a la adsorción y a la biotransformación. Para mejorar la eliminación de los EOCs durante la infiltración del agua de recarga se instaló una barrera reactiva en una balsa de infiltración. La barrera consistía en arena, compost vegetal, óxidos de hierro y arcilla. La finalidad del compost vegetal era por un lado la de aportar carbono orgánico disuelto para ser utilizado como principal fuente de carbono por la comunidad microbiana promoviendo así la generación de diversas condiciones redox, y por otro lado la de adsorber EOCs neutros. La Arcilla y los óxidos de hierro se pusieron con la intención de aumentar los sitios de adsorción para los EOCs catiónicos y aniónicos, respectivamente. La efectividad de la barrera en el campo se estudió comparando el comportamiento de los indicadores redox y de los EOCs antes y después de la instalación de la barrera. Mediante un ensayo de trazadores tipo pulso se obtuvieron las distribuciones de los tiempos de residencia del agua de recarga a los puntos de observación. Estas distribuciones se utilizaron para calibrar un modelo de flujo y transporte conservativo del acuífero. Por último, las tasas de degradación de primer orden y los factores de retardo de varios EOCs se estimaron mediante el ajuste de los resultados del modelo con las concentraciones observadas. Las tasas de degradación y los factores de retardo estimados se compararon con valores encontrados en la bibliografía. La barrera reactiva cumple su función aportando carbono orgánico y generando diversas condiciones redox. Muchos de los EOCs estudiados mostraron una mejor transformación cuando la recarga se realizó con la barrera reactiva. Las tasas de degradación y factores de retardo estimados en la barrera son mayores que los estimados para el resto del acuífero, y del mismo orden o superiores a los encontrados en la bibliografía. En resumen, la barrera reactiva propuesta mejora significativamente el rendimiento de la recarga artificial a través de balsas de infiltración, contribuyendo así a la renaturalización de las aguas recargadas
Richet, Nicolas. "Elaboration et caractérisation d'une protection anti-oxydation pour matériaux carbonnes : le système HfB(2)-SiC." Limoges, 2003. http://www.unilim.fr/theses-doctorat/2003LIMO0023/html/index-frames.html.
Повний текст джерелаThe aim of this work is the elaboration and the caracterisation of HfB2SiC oxidation protection coating for carbon based materials. Silicon carbide is formed by reactive infiltration of silicon through a porous carbon/HfB2 grains layer. The coating microstructure is composed of HfB2 grains surrounded by SiC nanoparticles and a phase containing Hf-B-Si-C at the interface between HfB2 and Sic. The oxidation behaviour was studied between 1 and 200 mbar by linear increase of temperature and under isothermal conditions. A sealing refractory glass, more stable than pure silica, is formed. The oxidation kinetic follows very quickly a slow parabolic law up to 1 700°C
Quet, Aurélie. "Composites de friction à matrice céramique : relation composition / structure / comportement tribologique." Bordeaux 1, 2007. http://www.theses.fr/2007BOR13512.
Повний текст джерелаC/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
Mills, Kevin. "The response of reactive clay soils to wetting agents in the presence of active vegetation." Thesis, Queensland University of Technology, 1998.
Знайти повний текст джерелаEveborn, David. "Bed filters for phosphorus removal in on-site wastewater treatment : Removal mechanisms and sustainability." Licentiate thesis, KTH, Land and Water Resources Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12048.
Повний текст джерелаFor many surface waters, phosphorus (P) leaching is a serious problem that should be minimized to prevent eutrophication. In Sweden there is a demand for physical and technical development of high-performance P removal techniques to reduce phosphorus leaching from on-site wastewater treatment systems to the Baltic Sea. However, although these systems are designed to reduce eutrophication there are also other environmental impacts to be considered when implementing them in on-site systems; energy use and global warming potential are two examples. This study has investigated several bed filter materials (reactive media and natural soils) for their total environmental impact (in commercial applications) as well as for the predominating chemical phosphorus removal mechanisms. The use of life cycle assessment revealed that several reactive bed filters are relatively energy-consuming due to the material manufacturing process. Characterization of phosphorus compounds in used reactive media provided evidence for calcium phosphate precipitation as the predominating P removal mechanism in alkaline filter materials. However, in soil treatment systems with noncalcareous soils, batch experiments and extractions suggested that aluminium compounds were important for P removal. According to mass balance calculations that compared accumulated P with the estimated P load in a soil treatment system, the long term P removal capacity was very low; only 6.4 % of the applied phosphorus had been removed during 16 years of operation.
Liégaut, Caroline. "Élaboration de composites à matrice céramique ultra-réfractaire résistants aux très hautes températures sous flux gazeux." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0035/document.
Повний текст джерелаSince many decades, Carbon/Carbon composites are used as structural parts in rocket engines due to their excellent thermomechanical properties. However, under highly oxidizing/corrosive atmosphere and high gas flow rates, carbon suffers from severe oxidation. To improve oxidation resistance of these composites, Ultra High Temperature Ceramics (UHTC) can be used as a protection. To protect the whole composite, the introduction of UHTC as a matrix has been done using a liquid phase process combining: (i) slurry infiltration process and (ii) reactive melt infiltration. Matrix constituents belong to the (B;C;Si;Zr) system. Material characterisation allowed a better understanding of the infiltration mechanisms and of the phase distribution and composition in respect to the processing conditions. To select the best composition, oxyacetylene torch testing has been done to recreate spacecraft launch environmental conditions. Post-test characterisation has been done to evaluate protection efficiency of each matrix composition for single use and possible reuse. Finally, advantages and drawbacks assessment of each composition allowed to highlight the most protective composition and phase distribution
Dutto, Mathieu. "Procédé micro-ondes pour l’élaboration de composites B4C-SiC par infiltration et réaction de silicium, en vue d’applications balistiques." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEM021/document.
Повний текст джерелаMany studies have shown the feasibility of processing silicon-boron carbide composite by infiltration of molten silicon through a porous preform made of boron carbide (Reaction Bonding Process). Using this method, the obtained composite contains a large amount of boron carbide, which is the hardest and the most interesting phase for ballistic application. In our developed process, the maximum processing temperature is 1600°C, which is far below the usual high temperature stage/pressure conditions commonly used to sinter B4C by conventional method (respectively 2200°C and40MPa). The main goal of this thesis is to develop a novel reaction bonded process based on microwave heating. Microwaves heating has many interesting features, including fast heating process, selective heating mechanism (in case of heating multi-materials) and volumetric heating distribution. . To fulfill our goal, many technological issues need to be addressed (working in controlled atmosphere and under microwave field, high temperature ...). This thesis reports the development of this novel process, and materials made from it, exhibit similar properties compared to those made conventionally. However, some microstructural differences were observed in SiC resulting phases. This thesis has allowed to-find out the boron carbide composite piece fabrication conditions in microwave cavity (Argon/Hydrogen10%, slight overpressure: 14bars)-show that mechanical properties (hardness, Young’s modulus…) obtained are comparable to those measured on conventionally reaction bonded produced materials. -show that formed SiC has some microstructural peculiarities, between vacuum samples (for conventional) and ones obtained in hydrogenous argon (using microwave).-show that it is possible to produce larger size piece (66mm of diameter). These results are shown to be promising for ballistic applications, including the fabrication of bulletproof jacket and light armor
Kleine, Barbara I. "How do metamorphic fluids move through rocks? : An investigation of timescales, infiltration mechanisms and mineralogical controls." Doctoral thesis, Stockholms universitet, Institutionen för geologiska vetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-115172.
Повний текст джерелаAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Manuscript. Paper 4: Manuscript.
Keedi, Caroline Bosquê. "Análise do efeito do dimetacrilato contra a infiltração bacteriana pela interface implante/componente protético através da PCR Real Time: um estudo in vivo." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/23/23150/tde-18032015-154447/.
Повний текст джерелаThe implant/prosthetic component interface often has gaps that serve as niches for bacterial colonization. The purpose of this study is to verify the effectiveness sealing this interface with dimethacrylate. Twenty two Straumann ® Bone Level implants was installed in areas with indication for single cemented prosthetic rehabilitation. The prosthetic components were installed in the control and experimental groups following the fabricant instructions, and adding the dimethacrylate in the interface of the experimental group. An initial collection and a second collection at the end of 90 days within each implant were performed, and after that, the technique of quantitative PCR was developed to analyze whether there was infiltration and detection of four bacterial species: Porphyromonas gingivalis, Treponema denticola, Tannerella forsythia. In the control group, all samples showed quantification of microorganisms, confirming bacterial percolation. In the control group, only 30% of the samples submitted quantification after the study period. Thus, the absence of bacteria in the experimental group was associated with the treatment for the period dimethacrylate. Considering the presence of at least one specific bacteria in the samples studied, the difference was also statistically significant. However, more studies should be conducted to verify that the seal will be effective for longer periods.
Mazilu, Irina. "Nanoparticules métalliques déposées sur des matériaux poreux multifonctionnels pour des applications catalytiques." Thesis, Poitiers, 2017. http://www.theses.fr/2017POIT2268.
Повний текст джерелаThe objective of the Ph.D. thesis is the development of new catalytic systems based on non-noble metal nanoparticles (Cu and/or Co MNPs) hosted in functional mesostructured hosts. To this aim, various supports are prepared by doping SBA-15 with Al, Ga and Fe heteroatoms using the two-step pH-adjustment method or by coating the SBA-15 surface with Al, Ga and Fe oxides using the melt infiltration approach. Likewise, hybrid organic-silica SBA-15 supports are obtained by partial extraction of the Pluronic P123 surfactant. The characterization and catalytic results show that the functionalization of SBA-15 supports with heteroatoms or with polyether groups originating from the native surfactant represents new strategic lines to achieve an enhanced control on the local environments of hosted MNPs and to engineer both the metal-support interaction and nanoparticle size, ultimately to fine tuning the performances of Cu and/or Co-based nanocatalysts in terms of activity and chemoselectivity for the liquid-phase hydrogenation of unsaturated aldehydes, such as cinnamaldehyde. Furthermore, SBA-15 materials containing Fe species in isolated and/or highly dispersed states are evaluated for the Fenton-type peroxidation of Reactive Red 120 azo dye, exhibiting excellent catalytic properties for the dye degradation
Laduye, Guillaume. "CVD du carbure de silicium à partir du système SiHxCl4-x/CyHz/H2 : étude expérimentale et modélisation." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0116/document.
Повний текст джерелаSilicon carbide (SiC) is material of choice for the matrix of Ceramic Matrix Composites (CMC).CH3SiCl3/H2 mixtures are currently used as gas precursor for the synthesis of the CVI-SiC matrices.The present work considers the dual-source approach with two separate carbon and silicon precursorsmolecules.In the case of SiHCl3/C3H8/H2 mixture, systematic studies of total flow rate, temperature, total pressureand C/Si ratio of initial gaseous phase are realized. Kinetics obtained with growth rate measurements and solid composition are compared with results from CH3SiCl3/H2 mixture. On the basis of the apparent reaction orders and activation energies, experimental kinetic laws are derived. Through IRTF analysis of the gas phase, the partial pressures of the different stable products are correlated with deposition kinetic and solid composition. Results obtained in gas-phase kinetic simulation show a good correlation with the experimental results and a mechanism of homogeneous decomposition is proposed. A better understanding of the role of the principal species in homogenous and heterogeneous phase is obtained through the study of six other gas systems and the roles of some effective precursors are discussed. Finally, infiltration results of porous material models with different precursor systems reveal significant improvements as homogeneity of kinetic deposit.Hence, favourable conditions to silicon carbide infiltration can be obtained by adapting the reactivity of the gas phase, with the choice of initial precursors and homogeneous chemistry associated. Asystematic study of the process evidences promising working windows for the infiltration of pure SiCin porous performs
沈宗憲. "Fabrication of the ceramic/metal composites by reactive infiltration." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/09689197866075200449.
Повний текст джерелаXie, Zhen Ming, and 謝振銘. "Application of polymers in reactive infiltration of silicon carbide preforms." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/61124202715314721376.
Повний текст джерелаNasery, Hesam. "Fabrication of AlN-MgO-MgAl2O4 ceramic composite by spontaneous reactive infiltration." Thesis, 2008. http://spectrum.library.concordia.ca/975845/1/MR40916.pdf.
Повний текст джерелаShamekh, Mohammed. "Processing and Characterization of Mg Matrix Composites Reinforced with TiC and TiB2 Phases using an In-situ Reactive Infiltration Technique." Thesis, 2011. http://spectrum.library.concordia.ca/36024/1/Shamekh_PhD_F2011.pdf.
Повний текст джерелаRoulier, Stephanie. "Caractérisation hydro-dispersive in situ de sols non saturés par infiltration d'eau et de soluté : cas de sols structures et de sols hétérogènes." Phd thesis, 1999. http://tel.archives-ouvertes.fr/tel-00802313.
Повний текст джерелаSithebe, Humphrey Samkelo Lungisani. "The preparation and characteristics of cBN ceramics with Al-based binder phases." Thesis, 2008. http://hdl.handle.net/10539/5876.
Повний текст джерелаGhanem, Hanadi [Verfasser]. "Processing of biomorphic porous ceramics by chemical vapor infiltration and reaction technique (CVI-R) = Herstellung biomorpher, poröser Keramiken mittels chemischer Gasphaseninfiltration und Reaktion / vorgelegt von Hanadi Ghanem." 2008. http://d-nb.info/991601882/34.
Повний текст джерелаAlmeida, Streitwieser Daniela [Verfasser]. "Kinetic investigation of the chemical vapor infiltration and reaction (CVI-R) process for the production of SiC and TiC biomorphic ceramics from paper preforms = Kinetische Untersuchung der chemischen Gasphaseninfiltration und Reaktion zur Hertsellung von SiC- und TiC-biomorphen Keramiken aus Papier-Vorformen / Daniela Almeida Streitwieser." 2005. http://d-nb.info/974205966/34.
Повний текст джерелаBoily, Nicolas. "Caractérisation du microbiote tumoral influençant la réponse immunitaire et de son importance pronostique dans le cancer du sein." Thèse, 2017. http://hdl.handle.net/1866/20432.
Повний текст джерела