Bibliografie tematiche / Porous metallic materials

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Letteratura scientifica selezionata sul tema "Porous metallic materials"

Autore: Grafiati
Pubblicato: 14 settembre 2024

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Articoli di riviste sul tema "Porous metallic materials"

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Fang, Yu Cheng, H. Wang, Yong Zhou e Chun Jiang Kuang. "Development of Some New Porous Metal Materials". Materials Science Forum 534-536 (gennaio 2007): 949–52. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.949.

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Porous metal materials have been widely used in various industrial fields in the world. This paper describes the recent research achievements of CISRI in the development of porous metal materials. High performance porous metal materials, such as large dimensional and structure complicated porous metal aeration cones and tube, sub-micron asymmetric composite porous metal, metallic membrane, metallic catalytic filter elements, lotus-type porous materials, etc, have been developed.
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Kou, Haibo, Yaowen Gao, Jiaxing Shao, Kaiyue Dou e Nan Wang. "Temperature-porosity-dependent elastic modulus model for metallic materials". REVIEWS ON ADVANCED MATERIALS SCIENCE 61, n. 1 (1 gennaio 2022): 769–77. http://dx.doi.org/10.1515/rams-2022-0270.

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Abstract Elastic modulus plays a key role in the application of porous metallic materials. However, to the best of our knowledge, few attempts have been made to model the simultaneous dependence of elastic modulus on temperature and porosity for metallic materials. The present article contributes to a rational temperature-porosity-dependent elastic modulus model for metallic materials with all parameters having definite physical significance. The model can well predict the elastic moduli of porous metallic materials, from extremely low temperature to ultrahigh temperature, and from dense material to about 0.9 porosity, with reference to an easy-to-access elastic modulus. In a special case, when intrinsic elastic modulus [M] = 2 and critical porosity P C = 1, a phenomenological parameter-free predictive model can be obtained. The model can be applied when the matrix Poisson ratio is 0.1 < v < 0.4 for Young’s modulus and 0.17 < v < 0.27 for shear modulus, which covers most metallic porous materials.
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Zhou, Z. Y., P. Q. Chen, W. B. Zhao, M. Shao e W. Xia. "Densification model for porous metallic powder materials". Journal of Materials Processing Technology 129, n. 1-3 (ottobre 2002): 385–88. http://dx.doi.org/10.1016/s0924-0136(02)00697-0.

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Martínez, M. A., F. Velasco e J. Abenojar. "Behaviour of Fluids in Porous Materials". Materials Science Forum 802 (dicembre 2014): 303–8. http://dx.doi.org/10.4028/www.scientific.net/msf.802.303.

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Abstract (sommario):
The pore structure and the presence of open and close porosity has always made difficult the study of the interaction between fluids and porous materials, being complicated the analysis of liquids wettability and permeability, capillarity or speed of wetting, among others. This work tries to deal with these problems in a simple way, from a theoretical point of view, applying hydrostatic laws and the effect of capillarity to address the effect of open porosity. Moreover, surface roughness of these materials is the consequence of surface finishing (e.g. polishing) and porosity. This work also faces this aspect of wettability of surfaces, important to understand sealing conditions or lubricant retention in powder metallurgical components. From a practical point of view, the speed of fluids through metallic filters is compared to that through metallic meshes.
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Liu, Shi Feng, Xiao Chen Ge, Hui Ping Tang e Xin Yang. "Research Advancement of Porous Fiber Metals". Advanced Materials Research 750-752 (agosto 2013): 569–73. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.569.

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Porous fiber metals are a kind of metallic materials which have a through-pore structure by forming and sintering.They have the advantages of light weight,high surface area and high specific strength.They are widely used in engineering field.This paper described the progress and application of porous fiber metals.And analysed the progresses of titanium fiber porous materials,nickel fiber porous materials,FeCrAl fibrous porous materials,copper fiber porous materials and stainless steel fiber porous materials,and prospected their further development.
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Chen, Jianru, e Da Zhang. "Multifunctional properties and applications of ultra-light porous metal materials". MATEC Web of Conferences 380 (2023): 01026. http://dx.doi.org/10.1051/matecconf/202338001026.

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Abstract (sommario):
Porous metallic material is a new type of material with a special structure, which undergoes structural changes under certain conditions, thus forming a new structural unit. Due to their unique porosity and pore size structure, ultralight porous metallic materials have unique multifunctional properties, such as absorption and buffering of vibration energy, energy absorption and weight reduction, thermal insulation, vibration and noise reduction, and tunable performance, and thus are widely used in aerospace, energy industry, transportation, and biomedical fields. This paper reviews the research progress of ultra-light porous metal materials at home and abroad in recent years, including the basic structure and main properties of ultra-light porous metal materials, and discusses their application fields. Although China started late in this field, it has taken a place in the international arena with the continuous research work. In the future, we should focus on basic research and engineering application research to lay a solid foundation for China to achieve technological breakthrough in this field.
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Wong, Pei-Chun, Sin-Mao Song, Pei-Hua Tsai, Muhammad Jauharul Maqnun, Wei-Ru Wang, Jia-Lin Wu e Shian-Ching (Jason) Jang. "Using Cu as a Spacer to Fabricate and Control the Porosity of Titanium Zirconium Based Bulk Metallic Glass Foams for Orthopedic Implant Applications". Materials 15, n. 5 (3 marzo 2022): 1887. http://dx.doi.org/10.3390/ma15051887.

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In this study, a porous titanium zirconium (TiZr)-based bulk metallic foam was successfully fabricated using the Cu spacer by employing the hot press method. TiZr-based bulk metallic foams with porosities ranging from 0% to 50% were fabricated and analyzed. The results indicate that thermal conductivity increased with the addition of Cu spacer; the increased thermal conductivity reduced the holding time in the hot press method. Moreover, the compressive strength decreased from 1261 to 76 MPa when the porosity of the TiZr-based bulk metallic foam increased to 50%, and the compressive strength was predictable. In addition, the foam demonstrated favorable biocompatibility in cell viability, cell migration capacity, and calcium deposition tests. Moreover, the pore size of the porous TiZr-based bulk metallic foam was around 120 µm. In conclusion, TiZr-based bulk metallic foam has favorable biocompatibility, mechanical property controllability, and porous structure for bone ingrowth and subsequent enhanced osteointegration. This porous TiZr-based bulk metallic foam has great potential as an orthopedic implant to enhance bone healing and decrease healing time.
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Chen, Mo. "Metal Materials Research Progress of Bone Injuries Repair". Academic Journal of Science and Technology 11, n. 3 (12 luglio 2024): 161–64. http://dx.doi.org/10.54097/37cqt915.

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Repairing large bone defects caused by trauma or disease poses a significant clinical challenge. Metallic materials with good mechanical properties, biocompatibility and manufacturing processes can be used to repair bone defects. Materials utilized for mending bone defects encompass autogenous bone, allograft bone, metallic substances, bioceramics, polymers, and diverse composites. Biodegradable metallic materials such as iron, magnesium and zinc alloys are considered ideal for bone repair. Emerging metallic materials such as porous tantalum and bismuth alloys are of interest due to their affinity and versatility with bone. Although these materials have shown strong reconstructive capabilities in bone repair, there are still many challenges to overcome. However, there are still many practical difficulties associated with these metallic materials that need to be improved.
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Kim, S. Y., M. H. Lee, T. S. Kim e B. S. Kim. "Co Oxidation Properties Of Selective Dissoluted Metallic Glass Composites". Archives of Metallurgy and Materials 60, n. 2 (1 giugno 2015): 1227–29. http://dx.doi.org/10.1515/amm-2015-0103.

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Abstract Porous metallic materials have been widely used in many fields including aerospace, atomic energy, electro chemistry and environmental protection. Their unique structures make them very useful as lightweight structural materials, fluid filters, porous electrodes and catalyst supports. In this study, we fabricated Ni-based porous metallic glasses having uniformly dispersed micro meter pores by the sequential processes of ball-milling and chemical dissolution method. We investigated the application of our porous metal supported for Pt catalyst. The oxidation test was performed in an atmosphere of 1% CO and 3% O2. Microstructure observation was performed by using a scanning electron microscope. Oxidation properties and BET (Brunauer, Emmett, and Teller) were analyzed to understand porous structure developments. The results indicated that CO Oxidation reaction was dependent on the specific surface area.
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He, Jenny X., Shruti Baharani e Yong X. Gan. "Processing and Electrochemical Property Characterization of Nanoporous Electrodes for Sustainable Energy Applications". Research Letters in Nanotechnology 2009 (2009): 1–5. http://dx.doi.org/10.1155/2009/313962.

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Preparation and electrocatalytic reactions of nanoporous materials in biodegradable fluids were studied. Electrochemical etching was conducted to selectively extract metallic elements from alloys to form porous structures. Electrocatalytic properties of the porous electrodes were characterized. Comparative studies on the electrochemical activities of the nanoporous metallic electrodes with bulk metallic wire catalysts were performed. It is found that the current density at the nanoporous electrode is three times higher than that of the bulk electrode.
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Più fonti

Tesi sul tema "Porous metallic materials"

1

Wittee, Lopes Christian. "Characterization of metallic species on porous materials by in situ XAS". Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/107953.

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El objetivo de esta tesis es estudiar la agrupación y el crecimiento de especies metálicas confinadas o soportadas en materiales porosos mediante espectroscopia de absorción de rayos X in situ. Para lograrlo, las especies de paladio y plata se han introducido en materiales porosos (¿-alúmina, carbón activo y zeolitas) mediante impregnación vía húmeda y métodos de intercambio iónico, respectivamente. Luego, el agrupamiento de estas especies metálicas se ha controlado mediante tratamientos de activación en diferentes atmósferas (inerte, oxidativa y reductiva) y seguido por XAS de manera detallada. El objetivo principal del trabajo actual es demostrar que tanto XANES como EXAFS pueden proporcionar información valiosa y, en cierto punto, innovadora durante el control de especies metálicas (en términos de tipo y tamaño de las especies). Aprovechando los procedimientos de análisis inusuales, como el análisis de los cumulantes, el ajuste de la parte imaginaria de la transformada de Fourier y otros, es posible obtener información refinada sobre los sistemas investigados. En la sección de introducción, se proporciona una compilación de estudios en los que se ha utilizado XAS como técnica importante para caracterizar especies metálicas en materiales porosos. Conscientes de que las personas pueden usar dicha introducción como base para estudios más complejos en el futuro, la discusión se ha dirigido tentativamente hacia este objetivo. El capítulo 4 se centra en el estudio de la influencia de los precursores de paladio y la naturaleza del soporte en las nanopartículas resultantes. El proceso de activación completo, es decir, la transformación precursor --> nanopartícula, ha sido seguido por XAS in situ. El análisis estuvo compuesto por el punto de partida (material impregnado), calcinación en flujo de O2 y reducción posterior con H2. La consecuencia del uso de diferentes precursores metálicos y soportes se ha discutido en términos del número de coordinación promedio obtenido a partir del análisis de datos de EXAFS, que fue respaldado por técnicas de caracterización de laboratorio. El capítulo 5 está dedicado al estudio de la agrupación de plata durante y después de los tratamientos de activación utilizando zeolitas de poro pequeño intercambiadas con plata como precursores y nanocontenedores. Se ha estudiado la influencia de la estructura y la composición química de los materiales basados en plata sobre las especies metálicas formadas en diferentes condiciones de agrupamiento y redispersión del metal (calcinación usando atmósferas distintas, reducción en H2, redispersión en O2) utilizando métodos de caracterización in situ o ex situ. Después, se discuten las consecuencias catalíticas de las zeolitas que contienen Ag en la reacción de SCO-NH3. En esta sección, la combinación de XAS in situ con varias técnicas de laboratorio ha demostrado ser fundamental para un completo entendimiento del trabajo. Finalmente, una lista de proyectos desarrollados en paralelo a esta tesis se proporciona al final de este documento.
The aim of this thesis is to study the clustering and growth of metallic species either confined or supported in porous materials by in situ X-ray absorption spectroscopy. To accomplish this task, palladium and silver species were introduced into porous materials (¿-alumina, activated carbon and zeolites) by wetness impregnation and ion-exchange methods, respectively. Then, the clustering of these metallic species was controlled by activation treatments in different atmospheres (inert, oxidative and reductive) and followed by XAS in a comprehensive way. The principal goal of current work is to demonstrate that both XANES and EXAFS can provide valuable and, at certain point, innovative information during tuning of metallic species (in terms of type and size). Taking advantage of unusual analysis procedures, such as cumulant approach, fitting of imaginary part of Fourier transform and others, it is possible to obtain refined information about the investigated systems. In the introduction section, a compilation of studies in which XAS was used as important technique to characterize metallic species in porous materials is provided. Conscious that people can use such introduction as a basis for more complex studies in the future, the discussion has been tentatively directed toward this goal. The chapter 4 is focused on the study of the influence of palladium precursors and the nature of support on the resultant nanoparticles. The whole activation process, i.e. the transformation precursor --> nanoparticle, was followed in situ by XAS. The analysis pathway was composed by the starting point (as-impregnated), calcination in O2 flow and posterior reduction with H2. The consequence of using distinct metal precursors and supports were discussed in terms of average coordination number obtained from EXAFS data analysis, which was co-supported by laboratory characterization techniques. The chapter 5 is dedicated to the study of silver clustering during and after activation treatments using Ag-containing small-pore zeolites as precursors and nanocontainers. The influence of framework structure and chemical composition of Ag-based materials on formed Ag species at different clustering and metal redispersion conditions (calcination using distinct atmospheres, reduction in H2, redispersion in O2) were studied using either in situ or ex situ characterization methods. After, the catalytic consequences of tuned Ag-containing zeolites in SCO-NH3 are discussed. In this section, the combination of in situ XAS with several laboratory techniques proved to be pivotal to have a full picture of the investigated system. Finally, a list of projects developed in parallel to this thesis is provided at the end of this document.
L'objectiu d'aquesta tesi és estudiar l'agrupació i el creixement d'espècies metàl·liques confinades o suportades en materials porosos mitjançant espectroscòpia d'absorció de raigs X in situ. Per a això, les espècies de pal·ladi i plata s'han introduït en materials porosos (¿-alúmina, carbó activat i zeolites) per mitjà de la impregnació via humida i mètodes d'intercanvi iònic, respectivament. Una vegada preparats els materials, l'agrupament de les espècies metàl·liques s'ha controlat fent ús de tractaments d'activació en diferents atmosferes (inert, oxidant i reductora) s'ha estudiat exhaustivament per XAS. L'objectiu principal del treball és demostrar que tant el XANES com l'EXAFS proporcionen informació rellevant i, en certa manera, innovadora per al control d'espècies metàl·liques (en termes de tipus i grandària d'aquestes espècies). Fent ús de procediments de tractament de dades no molt habituals com l'anàlisi de cumulants, l'ajust de la part imaginària de la transformada de Fourier i altres, és possible obtenir informació detallada sobre els sistemes estudiats. En l'apartat de la introducció, es proporciona una recopilació d'estudis en els quals s'ha utilitzat XAS com a tècnica principal per a caracteritzar les anomenades espècies metàl·liques en materials porosos. Aquesta introducció ha estat redactada per a que puga servir com a punt de partida per a futurs estudis que requereixen la utilització de XAS per a la caracterització de les espècies metàl·liques presents en els catalitzadors. El capítol 4 es centra en l'estudi de la influència dels precursors de pal·ladi i la naturalesa del suport front a les nanopartícules resultants. El procés d'activació, és a dir, la transformació precursor --> nanopartícula, ha sigut estudiat per XAS in situ. L'anàlisi per XAS va comprendre els següents passos: punt de partida (material impregnat), calcinació en flux d'O2 i reducció posterior amb H2. La utilització de diferents precursors i suports metàl·lics ha permès dur a terme una discussió, referent al nombre de coordinació mitjà obtingut a partir de l'anàlisi de dades de la zona EXAFS, que ha estat recolzat per altres tècniques de caracterització. El capítol 5 s'ha dedicat a l'estudi de l'agrupació de plata intercanviada en els catalitzadors durant i després dels tractaments d'activació. S'han utilitzat zeolites de porus xicotet, com la CHA i RHO, intercanviades amb plata. L'estudi de la influència de l'estructura zeolítica i la composició química dels materials enfront dels diferents tractaments d'activació (calcinació utilitzant diferents atmosferes, reducció en presència d'H2, re-dispersió en atmosfera d'O2) es va realitzar fent ús de mètodes de caracterització in situ o ex situ. A continuació, es discuteix la influència d'aquestes espècies metàl·liques formades, utilitzant els diferents mètodes d'activació, per a la reacció d'SCO-NH3. En aquest sentit, s'ha demostrat que la combinació de XAS in situ amb diverses tècniques habituals de laboratori és fonamental per al desenvolupament d'aquest treball. Finalment, es presenta una llista de projectes, en els quals també s'ha treballat paral·lelament, on s'ha utilitzat XAS com a tècnica de caracterització.
Wittee Lopes, C. (2018). Characterization of metallic species on porous materials by in situ XAS [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/107953
TESIS
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Brennan, Daniel P. "Small molecule and polymer templating of inorganic materials". Diss., Online access via UMI:, 2006.

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Guazzone, Federico. "Engineering of Substrate Surface for the synthesis of Ultra-Thin Composite Pd and Pd-Cu Membranes for H2 Separation". Digital WPI, 2006. https://digitalcommons.wpi.edu/etd-dissertations/442.

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Abstract (sommario):
This work describes a novel technique to prepare ultra-thin composite Pd-porous metal membranes for H2 separation. This novel technique consists of the gradual smoothing of the Porous Metal (PM) support's surface with several layers of pre-activated alumina particles of different sizes. The deposition of coarse, fine and ultra-fine alumina particles resulted in the narrowing of the PM' surface pore size distribution. The excellent surface smoothness achieved after the grading of the PM 's surface support allowed for the preparation of gas tight Pd layers as thin as 5.6?m. The Pd layers were extremely uniform due to the presence of the grade layer and strongly attached to the support. Composite Pd membranes prepared on graded supports showed H2 permeance as high as 50 m3/(m2 h bar0.5) at 500ºC and ideal selectivities (H2/He) as high as 27000. Moreover, the H2 permeance and ideal selectivity were stable over 1100 hours at 500ºC in H2 atmosphere. Composite Pd-Cu membranes showed H2 permeance as high as 30 m3/(m2 h bar0.5) at 450ºC and ideal selectivities (H2/He) as high as 900. The H2 permeance and ideal selectivity of Pd-Cu membranes were stable over 500 hours at 450ºC in H2 atmosphere. The outstanding long-term H2 permeance and ideal selectivity stability of all composite Pd and Pd-Cu membranes represented a breakthrough in composite Pd membrane synthesis. The thermal stresses arising from the mismatch in the coefficient of thermal expansion between the Pd film and the support were determined by means of x-ray diffraction. The results indicated that the release of stresses began to occur at temperatures close to 400ºC. Also, the release of stresses took place with a visible sintering of Pd clusters within the thin Pd film. The stresses due to the absorption of H2 were also studied and modeled. It was estimated that the maximum compressive stress under which these composite Pd membranes were characterized was equal to 260 MPa.
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Caputo, Matthew P. "4-Dimensional Printing and Characterization of Net-Shaped Porous Parts Made from Magnetic Ni-Mn-Ga Shape Memory Alloy Powders". Youngstown State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1525436335401265.

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Zhang, Liping. "Development of Bismuth Oxide-Based Materials for Iodide Capture and Photocatalysis". Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1542652670479038.

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Poudyel, Ghimire Pramila. "DEVELOPMENT OF PHENOLIC RESIN-DERIVED CARBONS AND THEIR COMPOSITES WITH TAILORED COMPOSITION, POROSITY AND MORPHOLOGY". Kent State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent157384419976016.

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Cuzacq, Laurent. "Élaboration et caractérisation de matériaux métalliques poreux par fabrication additive par dépôt de matière (Extrusion Additive Manufacturing) et par métallurgie des poudres". Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0144.

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L'aluminium (Al) est le métal non-ferreux le plus utilisé au monde. Ses propriétés physiques particulières en font un matériau de choix pour un grand nombre de domaines industriels comme les transports, la construction, l'alimentaire ou encore l'électronique. Sa faible densité est idéale pour réduire le poids des structures. Les matériaux poreux à base d'Al, présentent, de surcroit, l’avantage de présenter une très grande surface d'échange avec le milieu. Comme tous les métaux, l'Al est très facilement usinable. Toutefois, certaines formes, plus complexes, ne sont pas réalisables en utilisant les techniques d'usinage conventionnelles. Depuis plusieurs années, la recherche se tourne vers la fabrication additive pour surmonter ce problème.Dans ce manuscrit, nous utilisons une technique appelée fabrication additive par extrusion de pâte afin de réduire les coûts de productions et les pertes de matières premières occasionnés par l'impression 3D laser. Cette technique consiste à incorporer de la poudre métallique dans un gel composé d'un polymère et d'un solvant. Dans notre cas, nous utilisons un gel d'hydroxypropylcellulose (HPC) dans le butanol et nous y incorporons de la poudre d'Al ou un mélange de poudres à base d'Al. Cette pâte est ensuite conditionnée dans une seringue et placée dans l'imprimante 3D afin d'extruder des cordons à travers une buse de 0,86 mm de diamètre. Ces cordons sont déposés et empilés par le bras mécanique de l'imprimante 3D pour former des objets de formes prédéterminées. Une fois séchés, les objets sont traités thermiquement afin d'éliminer l'HPC et de ne garder que l'Al. Nous avons choisi d'élaborer des objets présentant à la fois des macroporosités et des microporosités afin d'augmenter la surface d'échange avec le milieu extérieur. Les propriétés de dissipations thermiques de ces objets ont été mesurées pour voir s'ils pouvaient être utilisés comme dissipateurs thermiques dans le domaine électronique. Les propriétés mesurées de ces objets se sont avérées supérieures à celles d'un bloc d'Al dense. Des objets composés d'un mélange d'Al et de AlSi12 ont également pu être imprimés et ont également montré de très bonnes propriétés de dissipation thermique.Dans la deuxième partie de ce manuscrit, nous nous sommes intéressés à la fin de vie de nos matériaux. Le recyclage des alliages d'Al n'est pas simple car au fur et à mesure des cycles de recyclage, une perte des éléments d'alliages peut être observée. Il faut donc réfléchir à un moyen de revaloriser les déchets d'Al ou d'alliages à base d'Al en fin de vie. Dans ce but, des matériaux modèles ont été synthétisés par métallurgie des poudres. En contrôlant le temps, la température et la pression appliquée lors du frittage, il a été possible de contrôler le taux de porosité au sein des échantillons. Par réaction chimique dans une solution aqueuse d'hydroxyde de sodium, nous avons pu créer de l'hydrogène qui pourrait ensuite être utilisé comme carburant dans les voitures (Toyota Miraï par exemple). Nous avons également montré que la cinétique de libération de l'hydrogène pouvait être contrôlée en contrôlant le taux de porosité au sein des échantillons. Enfin, nous avons travaillé sur un alliage Al-Mg permettant de créer de l'hydrogène non pas dans la soude, qui est un milieu très agressif, mais dans l'eau de mer. Ce dernier résultat permet de montrer que revaloriser des déchets d'alliages d'Al est faisable dans un milieu très peu toxique et très présent à la surface de la Terre
In this manuscript, we employ a technique called paste extrusion additive manufacturing to reduce production costs and raw material losses associated with laser 3D printing. This technique involves incorporating metallic powder into a gel composed of a polymer and a solvent. In our case, we use a gel of hydroxypropylcellulose (HPC) in butanol and incorporate aluminum powder or a mixture of aluminum-based powders. This paste is then loaded into a syringe and placed in the 3D printer to extrude filaments through a 0.86 mm diameter nozzle. These filaments are deposited and stacked by the 3D printer's mechanical arm to form objects of predetermined shapes. Once dried, the objects are thermally treated to remove the HPC, leaving only the aluminum. We chose to fabricate objects with both macroporosity and microporosity to increase the surface area for exchange with the external environment. The thermal dissipation properties of these objects were measured to assess their suitability as heat sinks in the electronics field. The measured properties of these objects were found to be superior to those of a dense aluminum block. Objects composed of a mixture of aluminum and AlSi12 were also successfully printed and exhibited excellent thermal dissipation properties.In the second part of this manuscript, we focused on the end-of-life of our materials. Recycling aluminum alloys is challenging because with each recycling cycle, a loss of alloying elements may occur. Therefore, it is necessary to consider ways to valorize end-of-life aluminum or aluminum-based alloy waste. For this purpose, model materials were synthesized via powder metallurgy. By controlling the time, temperature, and pressure applied during sintering, it was possible to control the porosity within the samples. Through a chemical reaction in an aqueous solution of sodium hydroxide, we were able to generate hydrogen, which could then be used as fuel in vehicles (such as the Toyota Mirai, for example). We also demonstrated that the kinetics of hydrogen release could be controlled by manipulating the porosity rate within the samples. Finally, we worked on an Al-Mg alloy to generate hydrogen not in caustic soda, which is a highly aggressive medium, but in seawater. This latter result demonstrates that valorizing aluminum alloy waste is feasible in a minimally toxic and abundant environment on Earth's surface
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Junqueira, Silvio Luiz de Mello. "Caracterização numerica e experimental da atenuação da radiação laser em espuma metalica". [s.n.], 1996. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265058.

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Orientador: Jose Luis Lage, Luiz Fernando Milanez
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-11-08T18:36:48Z (GMT). No. of bitstreams: 1 Junqueira_SilvioLuizdeMello_D.pdf: 23366873 bytes, checksum: 40ff350275cdc60184b7883f90658798 (MD5) Previous issue date: 1996
Resumo: O presente trabalho trata do estudo teórico e experimental dos efeitos térmicos causados pela aplicação da radiação laser sobre meios porosos e objetiva a determinação do coeficiente de atenuação de um meio poroso imerso em fluido. O modelamento matemático proposto utiliza a técnica dos volumes finitos, para resolver numericamente a equação do transporte do calor em coordenadas.cilíndricas. Um sistema de aquisição de dados baseado no conceito de instrumentos virtuais é elaborado para analisar o processo de aquecimento pela radiação de um laser de Argônio sobre uma matriz porosa de Alumínio 6101 imersa em quatro fluidos diferentes: ar, água, óleo polialfaolefina e Mercúrio. Uma metodologia inversa, estabelecida pela comparação de resultados numéricos e experimentais, é empregada para obter o coeficiente de atenuação da espuma metálica saturada. A análise inclui o emprego de duas metodologias de cálculo da condutividade térmica equivalente. Uma correlação entre os coeficientes de atenuação e um número de Prandtl equivalente do meio poroso é estabelecida
Abstract: In the present work, an investigation of thermal effects due to laser application is accomplished in order to determine the attenuation coeflicient of a porous matrix immersed in fluido The study included both theoretical and experimental analisys. In the theoretical analisys a numerical mo deI based on control volume method is developed to simulate the lasing process by solving the energy equation in cilindrical coordinates. A data acquisition system based on virtual instruments concept is elaborated to analyse the heating process result,ing from Argon Laser radiation over an Aluminum foam porous medium immersed in four different fluids, namely air, water, polyalphaolefin oil and Mercury. An inverse methodology, estabilished by comparison of numerical and experimental results, is used to obtain the attenuation coeflicient of the saturated metal foam. Calculations also included the use of two models for the effective thermal conductivity. Results indicated the existence of a linear correlation between laser attenuation and a defined equivalent Prandtl number
Doutorado
Termica e Fluidos
Doutor em Engenharia Mecânica
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9

Wollmann, Philipp, Matthias Leistner, Ulrich Stoeck, Ronny Grünker, Kristina Gedrich, Nicole Klein, Oliver Throl et al. "High-throughput screening: speeding up porous materials discovery". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138648.

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A new tool (Infrasorb-12) for the screening of porosity is described, identifying high surface area materials in a very short time with high accuracy. Further, an example for the application of the tool in the discovery of new cobalt-based metal–organic frameworks is given
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich
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Starykevich, Maksim. "Electrosynthesis of 1-D metallic nanoparticles from DES using porous anodic templates". Doctoral thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/21694.

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Doutoramento em Ciência e Engenharia de Materiais
O método de síntese de nanoparticulas 1-D assistido por um modelo tornou-se um tópico em voga na química após o desenvolvimento de filmes anódicos com poros bem ordenados. Contudo, a maioria dos trabalhos nesta área tem sido feita utilizando filmes porosos destacados devido à presença de uma barreira no fundo dos poros. No entanto, esta estratégia segue demasiados passos, o que aumenta o seu custo, torna mais difícil a execução e impõe várias limitações. Consequentemente, existe a necessidade de uma técnica que permita o enchimento (electrofilling) dos tubos sem remover a camada barreira – esta tese representa o nosso contributo para esse trabalho. Utilizámos uma técnica mais simples que permite a electrodeposição e “electrofilling” de nanoestruturas directamente nos modelos sobre o substrato metálico, utilizando solventes eutécticos profundos à base de cloreto de colina como electrólito. Relativamente à água, os solventes eutécticos profundos demonstram superior estabilidade térmica e uma janela electroquímica mais alargada, o que aumenta o número de materais secundários depositados. Como materiais a investigar foram escolhidos titânia e alumina dada a sua capacidade para formar estruturas porosas altamente ordenadas, propriedades eletroquímicas distintas e uso generalizado em síntese assistida por padrão. O estudo aqui apresentado encontra-se dividido em duas etapas. Primeiramente, a influência da camada barreira foi investigada em sistemas modelo através da utilização de filmes barreira densos na superfície dos elétrodos. Para os filmes de alumina e titânia, identificaram-se vários parâmetros que afectam a electrodeposição, dos quais se destacam a influência da voltagem de anodização, a espessura da camada de barreira, a dupla camada eléctrica e o perfil de corrente. Durante esta etapa detectaram-se efeitos nefastos, como a formação de uma densa camada orgânica na superfície do eléctrodo, que foram ultrapassados aumentando a temperatura ou alternando o potencial aplicado. A segunda etapa consistiu em passar de elétrodos planos (primeira etapa) para modelos porosos (segunda etapa). Foi realizado, com sucesso, o preenchimento dos poros de alumina e dos poros de titânia. Parâmetros como o perfil de corrente, temperatura de solução, entre outras, foram ajustadas para melhorar o fator de preenchimento e a homogeneidade do preenchimento. Foi desenvolvido um processo de preenchimento de moldes de alumina anódica em duas etapas, nucleação AC (1º passo) e preenchimento galvanostático (2º passo). Foram utilizadas três condições diferentes de modelos de titânia anódica porosa no “electrofilling”. O primeiro é sem modificação e demonstrou que a electroredução do zinco ocorre de forma aleatória ao longo de todo o comprimento do poro, o que leva ao fecho do poro e a um enchimento não homogéneo. A segunda modificação, cristalização total por têmpera, permite a preparação de estruturas coaxiais devido à deposição uniforme de zinco nas paredes dos poros. A última modificação foi a cristalização selectiva do fundo do poro. Foi descoberto que uma anodização adicional em eletrólitos não agressivos leva à cristalização da parte barreira dos tubos (fundo) e, consequentemente, a maior condutividade na parte inferior do que nas paredes. Este efeito permite um enchimento ascendente dos modelos porosos de titânia. As estratégias aqui apresentadas alargam a gama de possibilidades para a aplicação de modelos porosos anódicos na electrodeposição de diferentes nanoestruturas.
The template assisted method of 1-D nanoparticles synthesis has become a hot topic in Chemistry after the development of high-ordered porous anodic films. Most studies in this field have focused on the use of detached porous films due to the presence of the barrier layer on the pore bottom. However, this strategy follows a great number of steps, which raises its cost while decreasing convenience of operation and imposing several limitations. Consequently, there is a need for a technique which allows electrofilling of tubes without removing the barrier layer – this thesis represents our contribution to that enterprise. We have devised a simpler technique which allows electrodeposition of nanostructures directly in the templates on metallic substrate, using choline chloride based deep eutectic solvents (DES) as electrolyte. Compared to water, DES have improved thermal stability and a wider electrochemical window, dramatically increasing the number of possible secondary materials deposited. Titania and alumina were chosen as materials under study due to their known capacity to form highly-ordered porous structures, different electrochemical profiles and widespread use in template assisted synthesis. The present work is divided in two parts. First, the influence of the barrier layer has been investigated by using dense barrier films on the electrode surface as a model system. For both alumina and titania films, several parameters affecting the electrodeposition of zinc have been identified, notably the influence of the anodization voltage, barrier layer thickness, electrical double layer and current profile. During this stage, some negative effects have been detected, such as a dense organic layer formation on electrode surface, a hurdle which has been overcome by either increasing the temperature or applying the alternating potential. The second stage consisted in transferring the method from the flat electrodes (the first stage) to the porous templates. The successful filling of both porous alumina and porous titania, has been achieved. Parameters such as current profile, solution temperature, among others, have been tuned to improve the fill factor and homogeneity of the filling. A two-step porous anodic alumina template filling with AC nucleation (1st step) and galvanostatic filling (2nd step) has been developed. Three different types of porous anodic titania templates have been used for electrofilling. The first one was used as-prepared, showing that zinc electroreduction occurs in random places along all pore length, resulting in pore sealing and non-homogeneous filling. The second modification, full crystallization by annealing, allows the preparation of coaxial structures due to uniform zinc deposition on the pore walls. The last modification is selective bottom crystallization. It has been found that additional anodization in unaggressive electrolytes leads to crystallization of the barrier (bottom) part of the tubes and, thus, to higher conductivity of the bottom part than that of the walls. This effect allows a bottom-up filling of the titania porous template. The strategies presented here widen the range of possibilities for the application of porous anodic templates in the electrodeposition of different nanostructures.
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Libri sul tema "Porous metallic materials"

1

Gultekin, Goller, e United States. National Aeronautics and Space Administration., a cura di. Wear and friction behavior of metal impregnated microporous carbon composites. [Washington, D.C: National Aeronautics and Space Administration, 1997.

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2

Porous Metals and Metallic Foams. Trans Tech Publications, Limited, 2018.

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3

Wear and friction behavior of metal impregnated microporous carbon composites. [Washington, D.C: National Aeronautics and Space Administration, 1997.

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4

Metals & Materials Society Minerals. Proceedings of the 11th International Conference on Porous Metals and Metallic Foams (MetFoam 2019). Springer, 2020.

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5

Rabjei, Afsaneh. Porous Metals and Metallic Foams: 8th International Conference, June 23-26, 2013, Raleigh, North Carolina. DEStech Publications, Incorporated, 2013.

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Capitoli di libri sul tema "Porous metallic materials"

1

Cazacu, Oana, Benoit Revil-Baudard e Nitin Chandola. "Anisotropic Plastic Potentials for Porous Metallic Materials". In Solid Mechanics and Its Applications, 503–81. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-92922-4_8.

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Abe, Hiroya, e Kazuyoshi Sato. "Syntheses of Composite Porous Materials for Solid Oxide Fuel Cells". In Novel Structured Metallic and Inorganic Materials, 315–27. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7611-5_21.

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Polyakov, Victor V., Sergei V. Kucheryavski e Alexander V. Egorov. "Investigation of Fractal Properties of the Microstructure of Porous Metal Materials". In Metal Matrix Composites and Metallic Foams, 7–10. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527606203.ch2.

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Rodríguez-Méndez, Francisco, Bruno Chiné e Marcela Meneses-Guzmán. "Thermo-mechanical Stress Modeling of La(Fe,Co,Si)13 Thin Films Deposited on Porous Structures". In Proceedings of the XV Ibero-American Congress of Mechanical Engineering, 84–90. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-38563-6_13.

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AbstractThe thermo-mechanical behavior of a La(Fe,Co,Si)13 thin film deposited on a porous aluminum structure with a uniform geometry has been studied. Computational simulation techniques have been applied to the magnetocaloric material to model the thin film as a material with visco-plastic properties for thermal cycling at room temperature. The values obtained for stress, equivalent strain and cycles necessary for the material failure show a significant improvement in the mechanical stability and fatigue resistance of the metallic porous structure with the La(Fe,Co,Si)13 thin film, when compared to a model with the same geometry, but made entirely of La(Fe,Co,Si)13. These encouraging results prove the potential that this approach may have in the design and manufacture of magnetocaloric materials for magnetic refrigeration applications.
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Singh, Nand Kishore, Shashi Kant Kumar, Satish K. S. N. Idury, K. K. Singh e Ratneshwar Jha. "Dynamic Compression Response of Porous Zirconium-Based Bulk Metallic Glass (Zr41Ti14Cu12.5Ni10Be22.5) Honeycomb: A Numerical Study". In Structural Integrity of Additive Manufactured Materials & Parts, 308–21. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2020. http://dx.doi.org/10.1520/stp163120190136.

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Wong, Ka C. "From Angel Food Cake to Porous Titanium – A Novel Powder Metallurgical Approach for Metallic Foam Utilizing Food Processing and Ceramic Processing Techniques". In Materials Science Forum, 353–56. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-462-6.353.

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Kitazono, Koichi, Keiji Matsuo, Takuya Hamaguchi e Yuta Fujimori. "Design of Energy-Absorbing Materials for Space Crafts Based on Voronoi Diagrams". In Proceedings of the 11th International Conference on Porous Metals and Metallic Foams (MetFoam 2019), 3–10. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42798-6_1.

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Zhou, Jikou. "Porous Metallic Materials". In Advanced Structural Materials, 103–24. CRC Press, 2006. http://dx.doi.org/10.1201/9781420017465.ch5.

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"Porous Metallic Materials". In Advanced Structural Materials, 115–36. CRC Press, 2006. http://dx.doi.org/10.1201/9781420017465-9.

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"Porous Coatings on Metallic Implant Materials". In Materials for Medical Devices, 307–19. ASM International, 2012. http://dx.doi.org/10.31399/asm.hb.v23.a0005656.

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Atti di convegni sul tema "Porous metallic materials"

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Amoafo-Yeboah, N. T. "Surface Emissivity Effect on the Performance of Composite Metal Foam against Torch Fire Environment". In Porous Metals and Metallic Foams. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903094-1.

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Abstract. According to the US Department of Transportation (DOT), there are millions of liters of hazardous materials (HAZMATS) transported each year via railroad. This has translated to stringent safety measures taken to alleviate the effects of accidents involving tank cars carrying these HAZMATs. One of such measures is in the creation of the thermal protection system of tank cars in which the tank car must have sufficient thermal resistance when subjected to a simulated pool fire for 100 mins and a torch fire for 30 mins without its back plate temperature exceeding 427 ºC at any point of time. This requires a suitable material as a thermal blanket and insulation in tank car lining. Steel-steel composite metal foam (S-S CMF) is a novel metal foam with unique properties of high strength to density ratio, lightweight, and high energy absorption. It consists of metallic hollow spheres that are closely packed within a metal matrix. The large percentage of air within the hollow spheres provide both lightweight and insulating effects for CMF. S-S CMF is being investigated using the standard torch fire test requirement to determine its suitability as a material for tank car thermal protection. This is accomplished by developing a numerical model using the Fire dynamics simulator (FDS) as a form of validation for experimental work done. To properly evaluate this, there are various thermal properties of S-S CMF that need to be established for predicting CMF’s thermal response. Surface emissivity has been a challenging property to evaluate and hence this study focuses on developing an experimental and numerical procedure in evaluating this property for composite materials such as CMF. Preliminary data shows an acceptable prediction of emissivity, which will be applied to the FDS model for the torch fire test.
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Chacko, Z. "Thermal Conductivity of Steel-Steel Composite Metal Foam through Computational Modeling". In Porous Metals and Metallic Foams. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903094-3.

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Abstract. Thermal capabilities of Steel-Steel composite metal foam (CMF) against extremely high temperatures using computational methods have been investigated and contrasted with the characteristics of the base bulk steel materials. A physics-based three-dimensional model of CMF was constructed using Finite Element Analysis software for analyzing its thermal conductivity. The model built and analyzed in ANSYS Fluent was based on high temperature guarded-comparative longitudinal heat flow technique. ANSYS Fluent allows for the inclusion of air in the model, which is the main contributor to the low thermal conductivity of CMF compared to its constituent material. The model's viability was checked by comparing the computational and experimental results, which indicated approximately 2% deviation throughout the investigated temperature range. Excellent agreement between the experimental and computational model results shows that the CMF can be first modeled and analyzed using the proposed computational technique for the desired thermal insulation application before manufacturing. Based on the ratios of the matrix to the spheres and the thickness of the sphere walls, CMF can be tailored to the density requirements and then checked for its thermal performance using the model, thereby lowering the cost involved in its manufacturing and thermal characterization experiments.
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Cance, J. C. "Characterization of 316L Stainless Steel Composite Metal Foam Joined by Solid-State Welding Technique". In Porous Metals and Metallic Foams. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903094-2.

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Abstract. In previous studies, composite metal foams (CMF) have shown exemplary mechanical performance under impact which has made them prime candidates for protection of transported passengers and cargo. [1] Materials utilized in such applications often require joining to form structures and geometries that are far more complex or impossible to produce in an as-manufactured state. Welding methods are popular in the joining of metals with solid-state welding processes such as induction welding being of particular interest in the studies to be discussed. In this study, various thicknesses of 316L stainless steel CMF are manufactured through powder metallurgy technique and welded using Induction Welding. The mechanical properties of the weldments were studied through uniaxial tensile tests while microstructural characterization of the weldment within the joint interface and heat-affected zone (HAZ) are evaluated using scanning electron microscopy. The combination of these evaluations grant insight on the effects of various weld parameters (e.g., welding temperature, workpiece thickness, flux, and welding environment) as well as the suitability and restrictions of induction welding in the joining of 316L Stainless Steel CMF.
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del Val, J., A. Riveiro, R. Comesaña, F. Lusquiños, M. Bountinguiza, F. Quintero e J. Pou. "Laser-assisted manufacturing of porous metallic structures". In ICALEO® 2012: 31st International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2012. http://dx.doi.org/10.2351/1.5062413.

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Chen, Qiyong, Enqiang Lin, Victor K. Champagne, Aaron Nardi e Sinan Müftü. "Impact Mechanics of Spherical Metallic Particles with Uniformly Distributed Porosity". In ITSC2019, a cura di F. Azarmi, K. Balani, H. Koivuluoto, Y. Lau, H. Li, K. Shinoda, F. Toma, J. Veilleux e C. Widener. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.itsc2019p0846.

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Abstract In this study, finite element models are used to simulate the impact of porous WC-Co and Al particles cold sprayed onto substrates of the same materials. Effects of high strain rate, heat generation due to plasticity, interfacial friction, heat transfer, and material damage and failure are taken into account as are differences in the initial kinetic energy and strength of the materials. It was found that the influence of porosity increases with impact velocity and that the pores channel stress waves in unique ways not observed for solid particles. The results suggest that using porous particles for solid-state consolidation, as in cold spraying, could have advantages in terms of energy dissipation, although further investigation is required.
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Zhang, Bo, e Jian Zhu. "Inverse methods of determining the acoustical parameters of porous sound absorbing metallic materials". In 22nd International Congress on Acoustics: Acoustics for the 21st Century. Acoustical Society of America, 2016. http://dx.doi.org/10.1121/2.0000329.

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KNAAK, K. "Micro-mechanical study of damage evolution in isotropic metallic materials". In Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-155.

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Abstract. Virtual tests enable the expansion of the knowledge base accessible by direct experimentation. In particular, the role of microstructure on damage can be investigated using unit-cell models for porous materials. Additionally, it is of great interest to assess the role of the loading history on the response. In this paper, we present a dedicated user-defined element (U.E.L.) that was developed and implemented in the finite element (F.E.) code, ABAQUS. Verification of the capabilities of the U.E.L. is provided. The simulation results presented provide insights into the effect of J3 on the mechanical response and porosity evolution.
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Lee, Shen Huei Wynton, Hui Leng Choo, Sui Him Mok, Xin Yi Cheng e Yupiter Harangan Prasada Manurung. "Fabrication of porous metallic materials by controlling the processing parameters in selective laser melting process". In 13TH INTERNATIONAL ENGINEERING RESEARCH CONFERENCE (13TH EURECA 2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0001632.

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9

Riveiro, A., F. Lusquiños, R. Comesaña, F. Quintero e J. Pou. "Obtaining thermal damping metallic porous coating on ceramics by means of supersonic laser spray technique". In ICALEO® 2008: 27th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2008. http://dx.doi.org/10.2351/1.5061233.

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10

Jeng, T. M., T. Y. Wu, P. L. Chen, S. F. Chang e Y. H. Hung. "Flow Friction Behavior in Porous Channels". In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80168.

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A series of experimental studies on the flow friction behavior in a rectangular channel filled with various porous metallic foam materials have been performed. The rectangular channel has a cross-sectional area 60mm × 25.4mm with a length of 60mm. The parameters and conditions of interest in the study are the Reynolds number (Re) and medium porosity/pore density (ε/PPI). The ranges of the above-mentioned parameters are: Re=2058-6736 and ε=0.7-0.93/5-40PPI. Their effects on flow friction characteristics in such porous metallic foam channels have been systematically explored. In the study, the porous flow parameters including the Darcy number (Da), inertia coefficient (CF) and Darcy friction factor (f) are investigated. The combined effects of foam porosity and Reynolds number are examined in detail. From the results, the relevant new empirical correlations of Da and CF are proposed, respectively; and a new correlation of the friction factor in terms of ε, Da and Re is presented. Besides, the results reveal that all the ratios of f/fε=1 are much greater than unity and reach the orders of around hundreds to thousands. This manifests that it needs more pumping power to maintain the same flow rate as in a hollow channel. Finally, the experimental data of f/fε=1 is correlated in the study.
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