Journal articles: 'Porous metallic materials'

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Fang, Yu Cheng, H. Wang, Yong Zhou, and Chun Jiang Kuang. "Development of Some New Porous Metal Materials." Materials Science Forum 534-536 (January 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, and Nan Wang. "Temperature-porosity-dependent elastic modulus model for metallic materials." REVIEWS ON ADVANCED MATERIALS SCIENCE 61, no. 1 (January 1, 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, and W. Xia. "Densification model for porous metallic powder materials." Journal of Materials Processing Technology 129, no. 1-3 (October 2002): 385–88. http://dx.doi.org/10.1016/s0924-0136(02)00697-0.

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

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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, and Xin Yang. "Research Advancement of Porous Fiber Metals." Advanced Materials Research 750-752 (August 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, and 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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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, and 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, no. 5 (March 3, 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, no. 3 (July 12, 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, and B. S. Kim. "Co Oxidation Properties Of Selective Dissoluted Metallic Glass Composites." Archives of Metallurgy and Materials 60, no. 2 (June 1, 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, and 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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Colandini, Valérie, Michel Legret, Yves Brosseaud, and Jean-Daniel Baladès. "Metallic pollution in clogging materials of urban porous pavements." Water Science and Technology 32, no. 1 (July 1, 1995): 57–62. http://dx.doi.org/10.2166/wst.1995.0014.

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Porous pavements infiltrated with stormwater are faced with clogging problems: runoff particles seep and clog the pervious surface layer of these structures. Clogging material samples (in the form of sludge) have been collected in cleaning operations on the pervious asphalt. This study aims at characterizing these materials, particle size distribution, heavy metal contents by particle size, and studying interactions between metals and particles. A sequential extraction procedure proposed by the experts of the Community Bureau of Reference (B.C.R.) was applied to provide information about heavy metal distribution on particles and to evaluate interaction strength, and consequently potential metal mobility when chemical variations occurred in the environment. Mainly made up of sand, the materials are polluted with lead, copper, zinc and cadmium. The concentrations appeared to be linked with road traffic intensity. The heavy metal contents by particle size showed that the finer are the particles, the higher are the heavy metal concentrations. Heavy metals were found potentially labile; metals contents in the residual fraction (mineral fraction) represented less than 20 % of the total concentration. Cadmium and zinc were apparently more labile than lead and copper.

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Depczynski, Wojciech, Robert Kazala, Krzysztof Ludwinek, and Katarzyna Jedynak. "Modelling and Microstructural Characterization of Sintered Metallic Porous Materials." Materials 9, no. 7 (July 12, 2016): 567. http://dx.doi.org/10.3390/ma9070567.

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Kostornov, A. G., and V. N. Klimenko. "Electrical conductivity and contact phenomena in porous metallic materials." Powder Metallurgy and Metal Ceramics 37, no. 11-12 (November 1998): 602–6. http://dx.doi.org/10.1007/bf02680113.

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Bakarinova, V. I., and V. K. Portnoi. "Composite materials with metallic matrix and ceramic porous filler." Metal Science and Heat Treatment 37, no. 8 (August 1995): 331–34. http://dx.doi.org/10.1007/bf01151978.

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Lichy, P., V. Bednarova, and T. Elbel. "Casting Routes for Porous Metals Production." Archives of Foundry Engineering 12, no. 1 (January 1, 2012): 71–74. http://dx.doi.org/10.2478/v10266-012-0014-0.

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Casting Routes for Porous Metals Production The last decade has seen growing interest in professional public about applications of porous metallic materials. Porous metals represent a new type of materials with low densities, large specific surface, and novel physical and mechanical properties, characterized by low density and large specific surface. They are very suitable for specific applications due to good combination of physical and mechanical properties such as high specific strength and high energy absorption capability. Since the discovery of metal foams have been developed many methods and techniques of production in liquid, solid and gas phases. Condition for the use of metal foams - advanced materials with unique usability features, are inexpensive ways to manage their production. Mastering of production of metallic foams with defined structure and properties using gravity casting into sand or metallic foundry moulds will contribute to an expansion of the assortment produced in foundries by completely new type of material, which has unique service properties thanks to its structure, and which fulfils the current demanding ecological requirements. The aim of research conducted at the department of metallurgy and foundry of VSB-Technical University Ostrava is to verify the possibilities of production of metallic foams by conventional foundry processes, to study the process conditions and physical and mechanical properties of metal foam produced. Two procedures are used to create porous metal structures: Infiltration of liquid metal into the mold cavity filled with precursors or preforms and two stage investment casting.

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Jang, Seohyeon, Jihyeon Kang, Soomin Park, and Inho Nam. "Synthesis of Porous Metallic Structure and Its Application for Energy Storage Materials." Ceramist 25, no. 2 (June 30, 2022): 206–17. http://dx.doi.org/10.31613/ceramist.2022.25.2.07.

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Porous metal or metal oxide frameworks have been comprehensively applicated to numerous fields such as catalyst, energy storage system, and bio-filtration. Here, we introduce a de-alloying method prior to a facile polymer gel-templating to synthesize a self-supporting porous metal/metal oxide frameworks (e.g. Au, Ag, Ag/CuO, Au/MnO2, etc.). The template methods based on polymer gel suggest easy preparation of porous metal/metal oxide frameworks, prepared by heating a metal precursor impregnated in polymer gel. Compared to de-alloying Ag65A35 method, polymer gel based soft template serves numerous advantages as follows; 1) facile fabrication of porous transition metal structure, 2) atom economy, 3) high-loading of precious metals, 4) harmless to human and environment, 5) natural abundance, 6) easy to scale-up and control the pore size by differentiate the polymer content ratio, 7) mild reaction conditions, and 8) structural controllability, 9) cost-effectiveness, etc. We report the methodologies to synthesis bicontinuous metal/ metal oxide architectures, derived from porous gel soft templates, and they are applicated to the energy storage system such as, supercapacitor, pseudocapacitor, and battery.

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Seramak, Tomasz, Waldemar Serbiński, and Andrzej Zieliński. "Formation of Porous Structure of the Metallic Materials Used on Bone Implants." Solid State Phenomena 183 (December 2011): 155–62. http://dx.doi.org/10.4028/www.scientific.net/ssp.183.155.

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Research on improvement of structure and fabrication methods of the bone implants are carried out for many years. Research are aimed to shape the structures, that will have a Young's modulus value similar to the value of the human bones Young's modulus. Depending on the porosity, Young’s moduli can even be tailored to match the modulus of bone closer than solid metals can, thus reducing the problems associated with stress shielding of a human bones. The designed structure should also be characterized by a high abrasion and corrosion resistance to and allow bone ingrowth in the implant material to make the best bone-implant fixation. For this purpose, implants should have a porous structure with an appropriate pore size and with open-cell porosity. Material for bone implants must also have a high biocompatibility and bioactivity. Following these requirements, the metallic porous materials appear to be the most suitable material for bone implants. In this paper a various methods of a porous materials fabrication for bone implants are listed. It was shown that titanium and its alloys (e.g. Ti6Al4V or Ti13Nb13Zr) are widely used as biomaterials for implants. Research in order to increase their wear and corrosion resistance and to improve their biocompatibility and bioactivity are still carried out. One of the most effective methods of manufacturing the porous materials is a powder metallurgy (PM). In this paper the results of research under shaping the structure of the porous titanium alloy Ti13Nb13Zr are also presented. As a manufacturing method of the porous material from the investigated and mentioned above Ti alloy, the powder metallurgy (PM) was choosen - with and without the use of a space holders. Method of fabrication a spherical powder from the aforementioned Ti alloy and results of its morphology research are discussed. The applied powder compaction method (with use and without use of space holders) and the influence of a sintering process on the final microstructure morphology of porous material obtained from Ti13Nb13Zr alloy are also presented and discussed.

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Zadpoor, Amir A. "Additively manufactured porous metallic biomaterials." Journal of Materials Chemistry B 7, no. 26 (2019): 4088–117. http://dx.doi.org/10.1039/c9tb00420c.

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Additively manufactured (AM, =3D printed) porous metallic biomaterials with topologically ordered unit cells have created a lot of excitement and are currently receiving a lot of attention given their great potential for improving bone tissue regeneration and preventing implant-associated infections.

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Zhang, Haifeng, Aimin Wang, Hong Li, Wensheng Sun, Bingzhe Ding, Zhuangqi Hu, Hongnian Cai, Lu Wang, and Wen Li. "Quasi-static compressive property of metallic glass/porous tungsten bi-continuous phase composite." Journal of Materials Research 21, no. 6 (June 1, 2006): 1351–54. http://dx.doi.org/10.1557/jmr.2006.0166.

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A metallic glass/porous tungsten bi-continuous phase composite was prepared by pressure infiltration whose quasi-static compressive stress and strain to macroscopic failure are much higher than those of all the previous tungsten-reinforced metallic glass matrix composites. It deserves to be mentioned that because of its high-yield strength and high elastic strain limit, metallic glass seems to be used as the reinforcement to strengthen the crystalline materials in the bi-continuous phase composite materials.

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Wilhelm, M., M. Adam, M. Bäumer, and G. Grathwohl. "Synthesis and Properties of Porous Hybrid Materials containing Metallic Nanoparticles." Advanced Engineering Materials 10, no. 3 (March 2008): 241–45. http://dx.doi.org/10.1002/adem.200800019.

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Xu, Shoujun, Elad Harel, David J. Michalak, Charles W. Crawford, Dmitry Budker, and Alexander Pines. "Flow in porous metallic materials: A magnetic resonance imaging study." Journal of Magnetic Resonance Imaging 28, no. 5 (November 2008): 1299–302. http://dx.doi.org/10.1002/jmri.21532.

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Okulov, Artem, Stefan Berger, and Ilya Okulov. "Influence of β-Stabilizer Element on Microstructure and Mechanical Behavior of Porous Titanium Alloy Synthesized by Liquid Metal Dealloying." Materials 16, no. 16 (August 19, 2023): 5699. http://dx.doi.org/10.3390/ma16165699.

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The metallic implant materials for load-bearing applications typically possess a significantly higher stiffness when compared with that of human bone. In some cases, this stiffness mismatch leads to a stress-shielding effect and eventual loosing of the implant. Porous metallic materials are suitable candidates to overcome this problem. In this study, we synthesized low modulus open porous TiFe alloy by liquid metal dealloying of the precursor Ti47.5Fe2.5Cu50 (at.%) material in liquid Mg. Upon liquid metal dealloying, Cu was selectively dissolved from the precursor, and the remaining Ti and Fe elements were reorganized into a bicontinous porous structure. The synthesized TiFe alloy is composed of α-titanium and β-titanium phases. The average measured ligament size is in the micrometer range. It was found that a higher dealloying temperature leads to a pronounced coarsening of the microstructure. The open porous TiFe alloy possesses a low elastic modulus of about 6.4–6.9 GPa. At the same time, its yield strength value reaches about 185 MPa due to the α + β microstructure. Its attractive mechanical properties for biomedical applications, together with its open porous structure, indicate the potential of porous TiFe alloys to be used as implants.

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Kostornov, A. G., A. A. Shapoval, and I. V. Shapoval. "Skeletal heat conductivity of porous metal fiber materials." Kosmìčna nauka ì tehnologìâ 27, no. 2 (May 17, 2021): 70–77. http://dx.doi.org/10.15407/knit2021.02.070.

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The influence of a number of physical characteristics and parameters of metallic fiber materials on their thermal conductivity is studied in this work. Such porous materials are intended, among other things, for their effective use in two-phase heat transfer devices (heat pipes). The use of heat pipes in aircraft and space vehicles provides a number of thermophysical advantages. In particular, heat pipes significantly expand the possibilities of air cooling of heat-loaded technical devices. The thermal conductivity of capillary-porous materials-structures, which are important elements of heat pipes, significantly affects the intensity of two-phase heat transfer inside heat pipes. Frame thermal conductivity is equivalent to the thermal conductivity of materials that are conditionally continuous medium. Studies of the influence of structural characteristics of porous materials, such as porosity and parameters (dimensions) of discrete particles-fibers (fractions of the studied materials), were performed using special experimental equipment created at the I.M. Frantsevich Institute for Problems of Materials Science of the National Academy of Sciences of Ukraine (Kyiv). Porous metal structures (coatings) made of copper, nickel, and steel fibers (MPM) were investigated under conditions similar to those for space heat pipes. The porosity values of the prototypes of materials were in the range of 40 to 93%. The research results showed that the following physical characteristics of capillary structures, such as values of thermal conductivity of metallic materials (fiber fractions), the porosity of capillary-porous metal materials (structures), significantly affect the value of thermal conductivity of porous materials. The dimensions of discrete particles-fibers also affect in a certain way the value of the MBM thermal conductivity but to a lesser degree. The results obtained in this work are summarized in the form of empirical dependencies – formulas, providing engineering calculations of the thermal conductivity values of metal fiber materials. The research results are intended for practical application in aviation and spacecraft apparatus engineering. In particular, the presented results are necessary for the development and creation of effective heat pipes with metal fiber capillary structures.

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Tighadouini, Said, Smaail Radi, and Yann Garcia. "Selective chemical adsorption of Cd(ii) on silica covalently decorated with a β-ketoenol-thiophene-furan receptor." Molecular Systems Design & Engineering 5, no. 6 (2020): 1037–47. http://dx.doi.org/10.1039/c9me00140a.

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Kroupová, I., V. Bednářová, T. Elbel, and F. Radkovský. "Proposal of Method of Removal of Mould Material from the Fine Structure of Metallic Foams used as Filters." Archives of Metallurgy and Materials 59, no. 2 (June 1, 2014): 727–30. http://dx.doi.org/10.2478/amm-2014-0120.

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Abstract Metallic foams are materials that are subject of an ongoing research with the broad applicability in many different areas (e.g. automotive industry, building industry, medicine, etc.). These metal materials contain in their structure artificially created pores. These pores give them specific properties, such as: large rigidity at low density, high thermal conductivity, capability to absorb energy, etc. Since the discovery of porous metallic materials numerous methods of production have been developed. The aim of the paper is to introduce effective casting methods of manufacturing of metallic foams, namely cast metal filters from the aluminum alloy. Research deals with investment casting with use of pattern made of polymeric foam, which is used for production of metallic foam with open pores. The main disadvantage of this procedure consists in removing the mould material without damaging the fine structure of the cast filter. Plaster is used as the mould material and the most important result of this paper is the presentation of the effective procedure of plaster removal from the porous structure of cast filters.

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Pope, Edward J. A., and J. D. Mackenzie. "Ultrafine Metal Particles in Porous and Dense Silica Gels." MRS Bulletin 13, no. 3 (March 1988): 20–23. http://dx.doi.org/10.1557/s0883769400066100.

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The present trend of developing electronic devices with increasingly fine dimensions borders on a number of fundamental scientific questions about the very nature of how materials at ultrafine dimensions behave. This article addresses some of these questions. The fabrication of discrete metallic phases in porous and nonporous glassy matrices presents a number of exciting device possibilities. Methods of fabricating ultrafine metallic phases in silica via the sol-gel route are presented.In attempting to fabricate materials with ultrafine physical dimensions for a wide variety of applications, several fundamental questions arise about the nature of materials behavior. For example, how many metal atoms are necessary to form a cluster exhibiting “metallic“ properties? Moreover, does the number of atoms necessary depend upon which metallic property is examined? This question has been partly addressed by D.C. Johnson and co-workers with regard to magnetism in osmium clusters. Their results show a threefold increase in magnetic susceptibility between clusters containing 3–10 osmium atoms.Another important question, especially when considering device applications, is how the relative contributions of surface and bulk thermodynamics affect such properties as phase transformations. In addition, ultrafine phase dimensions interact with the fundamental unit lengths of a wide range of processes, including the wavelength of visible light, the mean free path lengths of conduction processes, the wavelengths of phonon vibrations, etc. How do these interactions affect optical, thermal, and electronic properties?Fabrication of ultrafine metallic particles in porous and nonporous matrices may lead to many possible device applications including heterogeneous catalysts, nonlinear optic devices, highvoltage switching devices based on interparticle tunneling, and perhaps even new types of charge storage devices (capacitors).

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Sonoda, Tsutomu, Kiyotaka Katou, and Tadashi Asahina. "Porous Structure and Mechanical Properties of the Cellular Metallic Materials Fabricated by Sintering Al Powder Coated with Sn." Materials Science Forum 591-593 (August 2008): 277–81. http://dx.doi.org/10.4028/www.scientific.net/msf.591-593.277.

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The deposition of pure tin onto pure aluminum powder in its self-convective motion by magnetron DC sputtering was examined in order to prepare Al-Sn composite powder and thereby to improve the sintering of the aluminum particles, aiming at the development of highly structure-controlled porous aluminum materials. The fabrication of porous aluminum materials was carried out by space-holder method using the prepared Al-Sn composite powder in ordinary powder metallurgy processing. The effects of the sputterdeposition of tin on porous structure and mechanical properties of the sintered compact were investigated. It was found that the porous structure of the sintered porous materials with the porosity 80% was better regulated by the sputter-deposition, compared to that without the deposition. Regarding their compressive properties, it was found that the plateau stress of the sintered porous materials reached by the sputter-deposition twice as high as that without the deposition. Therefore it was concluded that coating of aluminum powder with tin deposits enables the porous-structure to be controlled more effectively in fabricating sintered highly porous aluminum materials, as well as improves their mechanical property.

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Kroupová, Ivana, Martina Gawronová, Petr Lichý, Václav Merta, and Filip Radkovský. "Use of Molding Mixtures for the Production of Cast Porous Metals." Metals 12, no. 7 (July 1, 2022): 1134. http://dx.doi.org/10.3390/met12071134.

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This paper aims to present the possibility of producing cast porous metals (or metallic foams) in a low-tech way by the use of conventional foundry technologies, i.e., the common procedures and materials. Due to the technological and economic complexity of the production processes of cast metallic foams, research into this material currently focuses on the development of less demanding technologies. The introduction of such production processes may help to exploit the full application potential of metallic foams. Within the framework of our proposed procedure, molding and core mixtures are used for the production of molds and filler material (space holder), also called precursors. It is the shape, size, and relative position of the individual precursors that determines the shape of the internal structure of the resulting metallic foam. The core mixture for the production of precursors is evaluated in terms of changes in properties with respect to storage time. Attention is focused on one of the most common bonding systems, furan no-bake. Casting tests are carried out for the possibility of making cast porous metals from aluminum alloy with different shapes of internal cavities depending on the different shapes of the filler material. The collapsibility of the cores after casting is evaluated for the test castings. The results show that even using commonly available materials and processes, cast metallic foams with complex internal structures can be produced.

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Trushlyakov, V. I., I. Yu Lesnyak, and V. A. Sevoyan. "Creation of experimental base for investigation the effect of laser radiation on intensity of process of evaporation of liquid from porous metal structures." Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering 5, no. 2 (2021): 88–97. http://dx.doi.org/10.25206/2588-0373-2021-5-2-88-97.

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A review of existing methods for drying porous structures including porous metallic materials, is carried out, and a method based on electromagnetic action, in particular, laser radiation, is selected. Recommendations have been developed for physical models of the evaporation process of a model liquid from the developed versions of experimental samples that simulate various investigated porous metallic materials, an experimental stand. A program and methodology have been developed for preliminary experimental studies of the process of exposure to laser radiation on model liquid taking into account the dynamics of the surface and evaporation of model liquid for various experimental samples options including for working out the modes and parameters of laser radiation exposure. Preliminary experimental results have been obtained for the implementation of the developed program of the processes of laser radiation influence on the breast for two variants of experimental samples

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Le Droumaguet, Benjamin, Romain Poupart, Mohamed Guerrouache, Benjamin Carbonnier, and Daniel Grande. "Metallic Nanoparticles Adsorbed at the Pore Surface of Polymers with Various Porous Morphologies: Toward Hybrid Materials Meant for Heterogeneous Supported Catalysis." Polymers 14, no. 21 (November 3, 2022): 4706. http://dx.doi.org/10.3390/polym14214706.

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Hybrid materials consisting of metallic nanoparticles (NPs) adsorbed on porous polymeric supports have been the subject of intense research for many years. Such materials indeed gain from intrinsic properties, e.g., high specific surface area, catalytic properties, porous features, etc., of both components. Rational design of such materials is fundamental regarding the functionalization of the support surface and thus the interactions required for the metallic NPs to be strongly immobilized at the pore surface. Herein are presented some significant scientific contributions to this rapidly expanding research field. This contribution will notably focus on various examples of such hybrid systems prepared from porous polymers, whatever the morphology and size of the pores. Such porous polymeric supports can display pores with sizes ranging from a few nanometers to hundreds of microns while pore morphologies, such as spherical, tubular, etc., and/or open or closed, can be obtained. These systems have allowed some catalytic molecular reactions to be successfully undertaken, such as the reduction of nitroaromatic compounds or dyes, e.g., methylene blue and Eosin Y, boronic acid-based C–C homocoupling reactions, but also cascade reactions consisting of two catalytic reactions achieved in a row.

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Li, Yu Yan, and Xie Qing Huang. "The Effect of Heat Treatment Technology on Nonlinear Constitutive Relationship of Metallic Rubber." Advanced Materials Research 160-162 (November 2010): 200–203. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.200.

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In order to solve technological key problem of metallic rubber in the respect of engineering application, based on porous materials theory, this paper explored the method of nonlinear constitutive relationship constructed, thus in view of the effect of heat treatment technology on nonlinear constitutive relationship of metallic rubber, static experiments are made for seven kinds of tempered metallic rubber and seven kinds of untempered metallic rubber, it was found that each coefficient of nonlinear constitutive relationship of tempered metallic rubber was bigger than that of untempered metallic rubber, and the deformation of tempered metallic rubber was smaller than that of untempered metallic rubber. Lastly it concluded that appropriate heat treatment technology could improve mechanical properties of metallic rubber.

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Tam, C. Y., and C. H. Shek. "Effects of alloying on oxidation of Cu-based bulk metallic glasses." Journal of Materials Research 20, no. 10 (October 2005): 2647–53. http://dx.doi.org/10.1557/jmr.2005.0336.

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The oxidation kinetics and the effects of alloying on the oxidation behaviors of copper-based bulk metallic glasses were studied. The oxidation kinetics, oxide compositions, and structures were investigated by thermogravimetric analysis (TGA), x-ray diffraction, x-ray photoelectron spectroscopy (XPS), and scanning electron microscopy. Both the TGA results and the XPS depth profile measurements showed that the oxidation resistance of Cu60Zr30Ti10 bulk metallic glass was improved by adding Hf, but it deteriorated when it was alloyed with Y. The oxide phases were found to be ZrO2, Cu2O, and CuO in samples heated at 573 K while an additional metallic Cu phase was detected in the ones heated at 773 K. A porous oxide structure was observed in the (Cu0.6Zr0.3Ti0.1)98Y2 metallic glass oxidized at 673 K, and the poor oxidation resistance of the alloy is attributed to the porous structure.

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Ueda, Masato, and Masahiko Ikeda. "Controlling of mechanical property in additive manufactured porous titanium by structural control and alloying for bone substitutes." MATEC Web of Conferences 321 (2020): 05004. http://dx.doi.org/10.1051/matecconf/202032105004.

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Mechanical properties of metallic materials can be controlled by not only alloy design but also constructing appropriate structure. A porous material with adequate pore structure showing appropriate mechanical properties has long been sought as the ideal bone substitute, because it exhibits low Young’s modulus and bone ingrowth. Additive manufacturing (AM) can produce metallic tailor-made products such as artificial bone, several joints etc. The purpose of this work was to control the mechanical property of porous Ti by controlling the porous structure. In addition, the characteristics of Ti-Zr-Fe alloys were also investigated as the materials for the AM. First, porous polylactic acid with rhombicuboctahedron-derived structure was prepared by a 3D printer to determine appropriated structure for bone substitutes. The compressive strength and Young’s modulus was strongly influenced by the minimum cross-sectional area fraction perpendicular to the loading direction. Then the porous Ti with similar structures were prepared by a laser AM. The strength and Young’s modulus were extremely low compared with the expected ones. Then Ti-xmass%Zr-1mass%Fe alloys (x=0, 5, 10) were prepared as the materials for the AM. Vickers hardness increased almost linearly with Zr content by solution hardening. Ideal bone substitutes would be produced by such structural design and alloying.

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Chen, Z. T., and Shou Wen Yu. "On the Dynamic Ductilc Damage and Fragmentation in Porous Metallic Materials." Key Engineering Materials 145-149 (October 1997): 285–90. http://dx.doi.org/10.4028/www.scientific.net/kem.145-149.285.

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Chen, Biao, Guan-Jun Yang, Chang-Jiu Li, and Cheng-Xin Li. "Preparation of hierarchical porous metallic materials via deposition of microporous particles." Materials Letters 176 (August 2016): 237–40. http://dx.doi.org/10.1016/j.matlet.2016.04.083.

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JAYARAJ, J., B. PARK, D. KIM, W. KIM, and E. FLEURY. "Nanometer-sized porous Ti-based metallic glass." Scripta Materialia 55, no. 11 (December 2006): 1063–66. http://dx.doi.org/10.1016/j.scriptamat.2006.07.054.

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37

Devi, Mamta, and Urvashi Gupta. "ROTATING CASSON NANOFLUID CONVECTION FOR Au, Ag, CuO, AND Al2O3 NANOPARTICLES EMBEDDED BY DARCY-BRINKMAN POROUS MEDIUM." Special Topics & Reviews in Porous Media: An International Journal 14, no. 3 (2023): 31–47. http://dx.doi.org/10.1615/specialtopicsrevporousmedia.v14.i3.30.

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The present paper investigates convection in a Casson nanofluid layer in porous medium under the influence of Coriolis force using Darcy-Brinkman model. The analysis is carried out using linear stability theory, normal mode technique, and one term Galerkin type weighted residual method for various metallic and non-metallic nanoparticles. The outcomes are compared with previously published results, and fine agreements are noted for the permissible range of parameters. Numerical simulation for porous media is carried out for blood (Casson fluid) using the software Mathematica to make the investigation helpful for practical applications. The effect of porous medium, rotation, Casson parameter, and nanoparticle parameters is discussed. Interestingly, it is found that though Casson fluids are more stable as compared to regular fluids, the Casson parameter itself has a destabilizing effect on the system. The main objective of the study is to consider the impact of Coriolis force on a Casson nanofluid layer with metallic and non-metallic nanoparticles. This effect is of paramount importance in geophysical studies, particularly in the extraction of crude oils. Further, by increasing the rotation parameter, the axial velocity of the blood-based Casson fluid increases, which may help in the treatment of stenosis of arteries and throat. The importance and novelty of the study is the fact that Coriolis force can stabilize various nanoparticle-based Casson fluid layer systems, which were otherwise unstable. As far as metallic and non-metallic nanoparticles are concerned, the stability pattern followed by metallic nanofluids is iron-blood > copper-blood > silver-blood > gold-blood, and for non-metallic nanofluids is silica-blood > alumina-blood > titanium oxide-blood > copper oxide-blood.

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Anderson, Christopher, Forest Shaner, Walter Smith, and Claudia Luhrs. "Incorporation of Phase Change Materials into the Surface of Aluminum Structures for Thermal Management." Materials 15, no. 19 (September 27, 2022): 6691. http://dx.doi.org/10.3390/ma15196691.

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This article explores the concept of generating a porous anodic layer on the surface of a metallic component to host a phase change material (PCM) aiming to reduce the peak temperatures that the host structure will experience. The conditions to fabricate a porous anodic layer on top of an aluminum substrate were determined through varying anodization conditions: solution concentration, voltage employed, and anodization times. Pore sizes were characterized using scanning electron microscopy. The alkane n-eicosane was selected as PCM, introduced within the porous anodic annealed layer using vacuum impregnation and the thin film composite structure sealed. Epoxy resin and a metallic paste were tested as sealants. Thermal tests were performed to compare the behavior of aluminum alloy substrates anodized and sealed with and without PCM. The results showed pores with diameters in the 5–85 nm range, with average values that increased as the time of anodization was extended. The aluminum alloy impregnated with n-eicosane presents lowered surface peak temperatures during heating cycles than the samples that were only anodized or than the base alloy, demonstrating the potential of PCM incorporated in the superficial microstructure of anodic structures to manage, to a certain extent, peak transient thermal loads.

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Bautista, A., E. Arahuetes, F. Velasco, C. Moral, and R. Calabrés. "Oxidation Behavior of Highly Porous Metallic Components." Oxidation of Metals 70, no. 5-6 (September 11, 2008): 267–86. http://dx.doi.org/10.1007/s11085-008-9120-3.

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Shen, Fangning, Yu Yang, Zhuangzhuang Chu, and Zhuohong Yang. "Polymer-Assisted Metal Deposited Wood-Based Composites with Antibacterial and Conductive Properties." Coatings 12, no. 8 (August 11, 2022): 1161. http://dx.doi.org/10.3390/coatings12081161.

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Compressible metallic porous materials (CMPMs) have great potential for development in the energy and environmental fields. However, the scale-up preparation of CMPMs with stable metal layers, excellent elasticity, and multifunctionality remains exceedingly challenging. In this study, we designed a novel strategy with the aid of polymer-assisted metal deposition to synthesize metallic porous wood (Ni-PW) with a hierarchical cellular structure and excellent elasticity. Our approach can produce highly compressible MPW using intrinsically porous delignified wood with only 15.16% strain loss under a large compressive strain of 40% after 1000 loading-unloading cycles and 129.4 μm of the average porous size of the Ni-PW measured by mercury injection method. The resulting Ni-PW displays excellent antibacterial properties for Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) and electric conductivity (Resistance < 7 ty), which renders great potential in energy and environmental applications. This research provides a new insight into the fabrication of CMPMs in a cost-effective (~56.5 ¥ m−2) and scalable way.

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Kuganathan, Navaratnarajah, and Alexander Chroneos. "Lithium Storage in Nanoporous Complex Oxide 12CaO•7Al2O3 (C12A7)." Energies 13, no. 7 (March 26, 2020): 1547. http://dx.doi.org/10.3390/en13071547.

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Porous materials have generated a great deal of interest for use in energy storage technologies, as their architectures have high surface areas due to their porous nature. They are promising candidates for use in many fields such as gas storage, metal storage, gas separation, sensing and magnetism. Novel porous materials which are non-toxic, cheap and have high storage capacities are actively considered for the storage of Li ions in Li-ion batteries. In this study, we employed density functional theory simulations to examine the encapsulation of lithium in both stoichiometric and electride forms of C12A7. This study shows that in both forms of C12A7, Li atoms are thermodynamically stable when compared with isolated gas-phase atoms. Lithium encapsulation through the stoichiometric form (C12A7:O2−) turns its insulating nature metallic and introduces Li+ ions in the lattice. The resulting compound may be of interest as an electrode material for use in Li-ion batteries, as it possesses a metallic character and consists of Li+ ions. The electride form (C12A7:e−) retains its metallic character upon encapsulation, but the concentration of electrons increases in the lattice along with the formation of Li+ ions. The promising features of this material can be tested by performing intercalation experiments in order to determine its applicability in Li-ion batteries.

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Finkelstein, Arkady, Dmitry Husnullin, and Konstantin Borodianskiy. "Design and Fabrication of Highly Porous Replicated Aluminum Foam Using Double-Granular Space Holder." Materials 14, no. 7 (March 26, 2021): 1619. http://dx.doi.org/10.3390/ma14071619.

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Porous materials are widely employed in a wide variety of industrial applications due to their advanced functional performance. Porous aluminum is among the most attractive metallic materials. It can be produced using repeatable methods involving a replicated Al foam that also provides porosity control. In this work, a highly porous replicated Al foam was fabricated. First, the model of multifunctional packing density was used and corrected to select the appropriate space holders. Then, Al foam was produced using a double-granular sodium chloride space holder. The obtained results showed a maximum porosity of 65% that was achieved using a mix of coarse, irregular granules with spherical granules of intermediate size.

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Zhang, Jun Zhe, Xiao Peng Wang, Bo Zhang, and Li Hong Zhang. "Experimental Study of Acoustic Performance of Porous Metals at High Temperatures." Materials Science Forum 933 (October 2018): 373–79. http://dx.doi.org/10.4028/www.scientific.net/msf.933.373.

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Based on an improved two-microphone transfer function method, a testing system for the exploration of acoustic performance of porous materials under high temperature conditions was developed with porous foam copper as one of research objects. The acoustic performances of some porous metallic materials were studied in the temperature range of 300°C to 700°C under the premise of ensuring the temperature stability that makes the measurement uncertainty be ± 6°C at high temperatures. The sound absorption coefficient and the acoustic impedance ratio of porous coppers at different ambient temperatures were acquired accordingly. And then the influence of the variation of temperature fields on the acoustic properties of porous metals was analyzed. The experimental results are in good agreement with the theoretical analysis, which proves the rationality of design of the device and provides important references and specific guidance for future study of the acoustic properties of porous metal materials.

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Zhao, Ming, Koh-ichi Maruyama, and Satoshi Tanaka. "Solvothermal Fabrication of Mesoporous Pd Nano-Corals at Mild Temperature for Alkaline Hydrogen Evolution Reaction." Nanomaterials 14, no. 10 (May 17, 2024): 876. http://dx.doi.org/10.3390/nano14100876.

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Porous metallic nanomaterials exhibit interesting physical and chemical properties, and are widely used in various fields. Traditional fabrication techniques are limited to metallurgy, sintering, electrodeposition, etc., which limit the control of pore size and distribution, and make it difficult to achieve materials with high surface areas. On the other hand, the chemical preparation of metallic nanoparticles is usually carried out with strong reducing agents or at high temperature, resulting in the formation of dispersed particles which cannot evolve into porous metal. In this study, we reported the simple fabrication of coral-like mesoporous Pd nanomaterial (Pd NC) with a ligament size of 4.1 nm. The fabrication was carried out by simple solvothermal reduction at a mild temperature of 135 °C, without using any templates. The control experiments suggested that tetrabutylammonium bromide (TBAB) played a critical role in the Pd(II) reduction into Pd nanoclusters and their subsequent aggregation to form Pd NC, and another key point for the formation of Pd NC is not to use a strong reducing agent. In alkaline water electrolysis, the Pd NC outperforms the monodisperse Pd NPs and the state-of-the-art Pt (under large potentials) for H2 evolution reaction, probably due to its mesoporous structure and large surface area. This work reports a simple and novel method for producing porous metallic nanomaterials with a high utilization efficiency of metal atoms, and it is expected to contribute to the practical preparation of porous metallic nanomaterials by solvothermal reductions.

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Pérez-Mayoral, Elena, Inês Matos, Maria Bernardo, and Isabel Fonseca. "New and Advanced Porous Carbon Materials in Fine Chemical Synthesis. Emerging Precursors of Porous Carbons." Catalysts 9, no. 2 (February 1, 2019): 133. http://dx.doi.org/10.3390/catal9020133.

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The efficiency of porous carbons in fine chemical synthesis, among other application fields, has been demonstrated since both the porous structure and chemical surface provide the appropriated chemical environment favoring a great variety of relevant chemical transformations. In recent years, metal organic frameworks (MOFs) and covalent organic frameworks (COFs) have emerged as interesting opportunities in the preparation of porous carbons with improved physico-chemical properties. Direct calcination of MOFs or COFs, in the presence or not of others carbon or heteroatom sources, could be considered an easy and practical approach for the synthesis of highly dispersed heteroatom-doped porous carbons but also new porous carbons in which single atoms of metallic species are present, showing a great development of the porosity; both characteristics of supreme importance for catalytic applications. The goal of this review is to provide an overview of the traditional methodologies for the synthesis of new porous carbon structures together with emerging ones that use MOFs or COFs as carbon precursors. As mentioned below, the catalytic application in fine chemical synthesis of these kinds of materials is at present barely explored, but probably will expand in the near future.

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Abd, Osama Ibrahim. "Experimental analysis on metallic foams-a response surface methodology approach." International Journal of Engineering & Technology 4, no. 1 (January 18, 2015): 149. http://dx.doi.org/10.14419/ijet.v4i1.4033.

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This study aimed to fabricate metallic porous materials using powder metallurgy (PM) space-holder technique. In the PM route, Al powder was mixed with different ratios (7%, 10%, and 20%) and sizes (500 and 1000 μm) of sodium chloride granules as space-holder agent. The mixture was then compacted at different compacting pressures (150, 200, and 250 MPa) and then heated to 280 °C for sintering. Subsequently, sodium chloride granules were removed by dissolving in water to obtain the porous structure. Tests were performed on all porous Al specimens, and characteristics such as density and porosity were measured. A statistical approach was used to optimize processing parameters. ANOVA statistical tool was used to obtain the final evaluation of the most significant features, namely, relative density and porosity fraction.

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Calbo, Joaquín, Matthias J. Golomb, and Aron Walsh. "Redox-active metal–organic frameworks for energy conversion and storage." Journal of Materials Chemistry A 7, no. 28 (2019): 16571–97. http://dx.doi.org/10.1039/c9ta04680a.

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We review progress in the study of electroactive MOFs with redox activity for energy conversion and storage. Recent advances in mixed-valence MOFs are highlighted, which have led to record conductivities towards metallic porous materials.

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48

Fan, Hong Wei, Bing Hai Lv, Ju Long Yuan, Q. F. Deng, and W. F. Yao. "Fillers and Dissolvent in Porous Self-Generating Fine Super-Hard Abrasive Tool." Advanced Materials Research 135 (October 2010): 398–403. http://dx.doi.org/10.4028/www.scientific.net/amr.135.398.

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In order to obtain low surface damage and high machining efficiency for advanced ceramics, overcome clogging and dressing difficulties of traditional metal bonded super-hard abrasive, a novel fine super-hard abrasive with porous self-generating ability is proposed in this paper. And the matching of filler and dissolvent in abrasive are studied. Soluble filler is a key technology of porous self-generating fine super-hard abrasive. In this paper, metal, metal oxide and non-metallic oxide are respectively used as soluble fillers. Results of the experimental shows: In metal bonded super-hard abrasive, metal, metal oxide and non-metallic oxide as soluble filler are feasible, correspondingly, FeCl3 solution, aqueous solution and weak alkaline solution are used as dressing dissolvent, respectively. It can be met the requirement of high precision machining for advanced ceramic materials, hard and brittle machining materials.

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Xue, Xin, Guojian Shen, Xueqian Wu, Yunlingzi Xiong, Juan Liao, and Hongbai Bai. "Thermo-mechanical performances of elastic–porous materials with metallic wire mesh structures." Composite Structures 297 (October 2022): 115918. http://dx.doi.org/10.1016/j.compstruct.2022.115918.

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Kirichenko, O. V., A. A. Dubikovskaya, and V. G. Lapshin. "A properties comparison for porous materials from various metallic fibers and powders." Soviet Powder Metallurgy and Metal Ceramics 31, no. 1 (January 1992): 41–44. http://dx.doi.org/10.1007/bf00793641.

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Journal articles on the topic 'Porous metallic materials'

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