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Articles de revues sur le sujet « Nanostructured heterophasic material »

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Auteur : Grafiati
Publié le 11 mars 2023

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1

Ordanyan, S., V. Rumyantsev et Andrey Osmakov. « Structure and Properties of Heterophase Nanostructured Ceramics ». Advances in Science and Technology 45 (octobre 2006) : 1456–61. http://dx.doi.org/10.4028/www.scientific.net/ast.45.1456.

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The paper is dedicated to the study of the interdependence of structure and properties of sintered heterophase ceramic composition based on ultra-fine (nanosized) powders. The compositions based on brittle oxygen-free high-strength compounds under certain conditions are able to demonstrate micro-plasticity. Microstructure of such materials typically features homogeneous fine grains with certain critical maximum grain size. The substantial contribution of interphase boundaries and their dislocation structure to the non-trivial mechanical properties is discussed. Special features of interphase boundaries are demonstrated to contribute to the change in rupture resistance of the heterophase ceramics. Correlations between strength and elastic properties and results of tribological tests using «pin and disk» arrangement were studied. Increased fracture resistance, wear resistance, and micro-plasticity of heterophase ceramics is found to be due to the modification microstructure size parameters and distinctive features of interphase boundaries. The generally formulated purpose of the present study is a search for the solution to the problem of production of the advanced structural ceramic materials based upon oxygen-free refractory compounds with improved physical and mechanical properties.
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2

Silchenko, O. B., M. V. Siluyanova, V. Е. Nizovtsev, D. A. Klimov et A. A. Kornilov. « On the prospects of application of nanostructured heterophase polyfunctional composite materials inengine building industry ». Voprosy Materialovedeniya, no 1(93) (6 janvier 2019) : 50–57. http://dx.doi.org/10.22349/1994-6716-2018-93-1-50-57.

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The paper gives a brief review of properties and applications of developed extra-hard nanostructured composite materials and coatings based on them. The presentresearch suggestsaerospace applications of nanostructured composite materials based on carbides, carbonitrides and diboridesof transition and refractory metals. To improve the technical and economic performance of gas turbine engines, it is advisable to use new composite structural materials whose basic physicomechanical properties are several times superior to traditional ones. The greatest progress in developing new composites should be expected in the area of materials created on the basis of polymer, metal, intermetallic and ceramic matrices. Currently components and assemblies of gas turbine engines and multiple lighting power units with long operation life and durability will vigorously develop. Next-generation composites are studied in all developed countries, primarily in the United States and Japan.
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3

Afanasjev, V. P., et A. A. Petrov. « Nanostructured heterophase thin films of lead zirconate titanate ». Physics of the Solid State 51, no 7 (juillet 2009) : 1332–36. http://dx.doi.org/10.1134/s1063783409070038.

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4

Nizovtsev, V. E., D. A. Klimov, A. D. Bortnikov et O. V. Nizovtsevа. « Prospects of application of nanostructured heterophase polyfunctional composite materials in aero-engine manufacturing ». VESTNIK of the Samara State Aerospace University 14, no 3-1 (1 décembre 2015) : 122. http://dx.doi.org/10.18287/2412-7329-2015-14-3-1-122-127.

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5

Nizovtsev, V. E., D. A. Klimov, A. D. Bortnikov et O. V. Nizovtsev�. « Prospects of application of nanostructured heterophase polyfunctional composite materials in aero-engine manufacturing ». VESTNIK of the Samara State Aerospace University 14, no 3-1 (1 décembre 2015) : 122. http://dx.doi.org/10.18287/2412-7329-2015-14-3-122-127.

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6

Han, Mi-Kyung, Sol Kim, Ha-Yeong Kim et Sung-Jin Kim. « An alternative strategy to construct interfaces in bulk thermoelectric material : nanostructured heterophase Bi2Te3/Bi2S3 ». RSC Advances 3, no 14 (2013) : 4673. http://dx.doi.org/10.1039/c3ra23197f.

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7

Shur, V. Ya. « Polarization Switching in Heterophase Nanostructures : PLZT Relaxor Ceramics ». Physics of the Solid State 47, no 7 (2005) : 1340. http://dx.doi.org/10.1134/1.1992615.

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8

Joh, Dong Woo, Amjad Hussain, TAE-Hun KIM, Jong-Eun Hong, Seungbok Lee, Tak-Hyoung Lim et Rak-Hyun Song. « Nanostructured Lscf-GDC Cathodes Via a Sol–Gel Method for High Performance Solid Oxide Fuel Cells ». ECS Meeting Abstracts MA2022-02, no 50 (9 octobre 2022) : 2584. http://dx.doi.org/10.1149/ma2022-02502584mtgabs.

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Cobaltite-based perovskite materials such as La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF), Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) which have rapid surface activation and mixed ionic and electronic ionic conductivity (MIEC) usually mixed with ionic conducting electrolyte material to lower cathodic polarization resistance. Moreover, decreasing the particulate size of the cathode at nanoscale can effectively enhance the ORR activity of the cathode by extending the electrochemically active sites due to its high surface area. However, due the high surface energy, the nanoparticles easily aggregate before mixing into homogeneous heterophase nanoparticles, resulting in significant coarsening between adjacent particles during high-temperature sintering. In this study, GDC and LSCF-GDC composite powders were synthesized via advance sol-gel method. The physicochemical properties such as sintering behavior, phase stability, etc. of the synthesized nanopowders were investigated. The optimal sintering conditions of GDC nanopowders were evaluated based on the relative density and total conductivity of the sintered GDC pellets. Furthermore, the electrochemical performances of the LSCF-GDC nanocomposite cathodes were measured by the electrochemical impedance spectroscopy (EIS). The microstructural characteristics of the LSCF-GDC nanocomposite cathode were quantified via a 3D reconstruction techniques and related to electrochemical performance of the Ni-YSZ anode supported SOFC single cell.
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9

Zuo, J. D., Y. Q. Wang, K. Wu, C. Yang, J. Y. Zhang, G. Liu et J. Sun. « High thermal stability of nanostructured Al mediated by heterophase interfaces and nanotwinning ». Materials Science and Engineering : A 793 (août 2020) : 139823. http://dx.doi.org/10.1016/j.msea.2020.139823.

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10

Ullattil, Sanjay Gopal, Janez Zavašnik, Ksenija Maver, Matjaž Finšgar, Nataša Novak Tušar et Albin Pintar. « Defective Grey TiO2 with Minuscule Anatase–Rutile Heterophase Junctions for Hydroxyl Radicals Formation in a Visible Light-Triggered Photocatalysis ». Catalysts 11, no 12 (10 décembre 2021) : 1500. http://dx.doi.org/10.3390/catal11121500.

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The novelty of this work was to prepare a series of defect-rich colored TiO2 nanostructures, using a peroxo solvothermal-assisted, high-pressure nitrogenation method. Among these solids, certain TiO2 materials possessed a trace quantity of anatase–rutile heterojunctions, which are beneficial in obtaining high reaction rates in photocatalytic reactions. In addition, high surface area (above 100 m2/g), even when utilizing a high calcination temperature (500 °C), and absorption of light at higher wavelengths, due to the grey color of the synthesized titania, were observed as an added advantage for photocatalytic hydroxyl radical formation. In this work, we adopted a photoluminescent probe method to monitor the temporal evolution of hydroxyl radicals. As a result, promising hydroxyl radical formations were observed for all the colored samples synthesized at 400 and 500 °C, irrespective of the duration of calcination.
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11

Ge, Yiyao, Xixi Wang, Bo Chen, Zhiqi Huang, Zhenyu Shi, Biao Huang, Jiawei Liu et al. « Preparation of fcc ‐2H‐ fcc Heterophase Pd@Ir Nanostructures for High‐Performance Electrochemical Hydrogen Evolution ». Advanced Materials 34, no 4 (4 décembre 2021) : 2107399. http://dx.doi.org/10.1002/adma.202107399.

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12

Korotaev, D. N., K. N. Poleshchenko, E. N. Eremin et E. E. Tarasov. « Effect of cluster-gradient architecture of nanostructured topocomposites on features of tribointeraction with heterophased material ». Strengthening Technologies and Coatings, 2020, 130–35. http://dx.doi.org/10.36652/1813-1336-2020-16-3-130-135.

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The wear resistance and wear characteristics of cluster-gradient architecture (CGA) nanostructured topocomposites are studied. The specifics of tribocontact interaction under microcutting conditions is considered. The reasons for retention of high wear resistance of this class of nanostructured topocomposites are studied. The mechanisms of energy dissipation from the tribocontact zone, due to the nanogeometry and the structural-phase structure of CGA topocomposites are analyzed. The role of triboactivated deformation and diffusion processes in providing increased wear resistance of carbide-based topocomposites is shown. They are tested under the conditions of blade processing of heat-resistant titanium alloy.
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13

Li, Qian, Hongfei Cheng, Caihong Xing, Songhao Guo, Xiaotong Wu, Liming Zhang, Dongzhou Zhang et al. « Pressure‐Induced Amorphization and Crystallization of Heterophase Pd Nanostructures ». Small, 28 mars 2022, 2106396. http://dx.doi.org/10.1002/smll.202106396.

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14

Chen, Yu, Jun Ding et Zhen-Dong Sha. « Grain Size and Heterophase Effects on Mechanical Properties of Mg-Cu Nanoglasses ». Frontiers in Materials 9 (14 juin 2022). http://dx.doi.org/10.3389/fmats.2022.908952.

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Tailoring heterogeneities in amorphous alloys is a promising strategy for promoting the strength-ductility synergy. Here, molecular dynamics simulations are performed to investigate the effects of grains size and heterogeneous chemical composition on the mechanical properties of Mg-Cu nanoglasses (NGs). The reduced grain size in single-phase NGs improves the plasticity but at the expense of strength. In addition, the mechanical properties of dual-phase NGs composed of two chemical compositions depend critically upon the fraction of softer phase. In particular, the plasticity is improved for the low fraction of the softer phase, but is deteriorated for the high fraction of the softer phase, which is in striking contrast to the observations of the plasticity improvement reported in the traditional nanostructured metals/alloys. This is because that heterogeneities at the glass-glass interfaces intentionally introduce more stress concentration sites which are easier to accelerate the shear band formation. For an appropriate fraction of heterogeneous composition, a balance among strength and plasticity can be realized, which is useful for the design of novel NGs with high strength and superior ductility.
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15

« LOW-RESISTANCE Bi/Pb CERAMICS CONTAINING Ts = 295К-315K PHASES SYNTHESIZED IN A SOLAR FURNACE (PARKENT) ». CHEMISTRY AND CHEMICAL ENGINEERING 2020, no 3 (4 décembre 2020) : 20–24. http://dx.doi.org/10.51348/ulje2155.

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The aim of this work is to obtain bulk textured superconducting ceramics based on glass-crystalline precursors of the Bi1.7Pb0.3Sr2Ca(n-1)CunOy (n=5-9) series. Technologies for obtaining superconducting materials are presented. The advantages of melt methods and “Super Fast Aloys Quenching–T” technology is shown. Compositions, methods of synthesis and study of properties of precursors and ceramics obtained by solar energy are presented. The interrelation of the morphology of glass-crystalline precursors and superconducting ceramics based on them is revealed. It is shown that nano-sized nuclei are the basis on which superconducting phases with Ts = 295-315K are formed as a result of the peritectic reaction. The mechanism of conduction in nanostructured layered ceramics containing higher superconducting phases is proposed. The contribution to the conductivity of low-resistance ceramics is assumed due to the mutual influence of Bi / Pb homologous phases, which represent a “quasi” heterogeneous system by analogy with the mechanism proposed by Rashba for heterophase semiconductors.
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