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排序方式: 共有89条查询结果,搜索用时 15 毫秒
1.
Jan Tobias Krüger Kay-Peter Hoyer Anatolii Andreiev Mirko Schaper Carolin Zinn 《Advanced Engineering Materials》2023,25(3):2201008
In medical technology, implants are used to improve the quality of patients’ lives. The development of materials with adapted properties can further increase the benefit of implants. If implants are only needed temporarily, biodegradable materials are beneficial. In this context, iron-based materials are promising due to their biocompatibility and mechanical properties, but the degradation rate needs to be accelerated. Apart from alloying, the creation of noble phases to cause anodic dissolution of the iron-based matrix is promising. Due to its high electrochemical potential, immiscibility with iron, biocompatibility, and antibacterial properties, silver is suited for the creation of such phases. A suitable technology for processing immiscible material combinations is powder-bed-based procedure like laser beam melting. This procedure offers short exposure times to high temperatures and therefore a limited time for diffusion of alloying elements. As the silver phases remain after the dissolution of the iron matrix, a modification is needed to ensure their degradability. Following this strategy, pure iron with 5 wt% of a degradable silver–calcium–lanthanum alloy is processed via laser beam melting. Investigation of the microstructure yields achievement of the intended microstructure and long-term degradation tests indicates an impact on the degradation, but no increased degradation rate. 相似文献
2.
3.
Anatolii S. Burlov Valery G. Vlasenko Maxim S. Milutka Yurii V. Koshchienko Nadezhda I. Makarova Vladimir A. Lazarenko Alexander L. Trigub Alexandra A. Kolodina Alexander A. Zubenko Anatoly V. Metelitsa Dmitrii A. Garnovskii Alexey N. Gusev Wolfgang Linert 《International journal of molecular sciences》2022,23(23)
New azomethine compounds of 2-(N-tosylamino)benzaldehyde or 5-chloro-2-(N-tosylamino)benzaldehyde and the corresponding chlorine-substituted anilines, zinc(II) complexes based on them have been synthesized. The structures of azomethines and their complexes were determined by elemental analysis, IR, 1H NMR, X-ray spectroscopy, and X-ray diffraction. It is found that all ZnL2 complexes have a tetrahedral structure according to XAFS and X-ray diffraction data. The photoluminescent properties of azomethines and zinc complexes in methylene chloride solution and in solid form have been studied. It is shown that the photoluminescence quantum yields of solid samples of the complexes are an order of magnitude higher compared to the solutions and range from 11.34% to 48.3%. The thermal properties of Zn(II) complexes were determined by thermal gravimetric analysis (TGA) and differential scanning calorimetry. The TGA curves of all the compounds suggest their high thermal stability up to temperatures higher than 290 °C. The electrochemical properties of all complexes were investigated by the cyclic voltammetry method. The multilayered devices ITO/PEDOT:PSS/NPD/Zn complex/ TPBI/LiF/Al with wide electroluminescence (EL) color range spanning the range from bluish-green (494 nm) to green (533 nm) and the high values of brightness, current and power efficiency were fabricated. The biological activity of azomethines and zinc complexes has been studied. In the case of complexes, the protistocidal activity of the zinc complex with azomethine of 5-chloro-2-(N-tosylamino)benzaldehyde with 4-chloroaniline was two times higher than the activity of the reference drug toltrazuril. 相似文献
4.
Anatolii Ustinov Yury Falchenko Tatyana Melnichenko Andrey Shishkin Gennady Kharchenko Lidia Petrushinets 《Journal of Materials Processing Technology》2013,213(4):543-552
In the diffusion welding (DW) of difficult-to-deform materials (such as composites and intermetallics), the application of intermediate multilayer foils (MF), which have alternating layers of elements that form intermetallics, allows for production of a permanent joint under milder conditions. In this paper, the processes occurring in the joint zone (JZ) during DW of Al–5 wt.%Mg+27 wt.%Al2O3 composite material through the Al/Cu interlayer were studied. It was shown that, while heating of such a foil, phase transformations that are due to the reaction diffusion of elements, run in it. At MF heating under a continuously applied external load, the materials are plastically deformed. It is established that the intensity of foil plastic deformation at a specified load non-monotonically depends on temperature. It is shown that welding temperature is determined by the temperature at which MF can undergo superplastic flow under the impact of applied pressure. A mechanism of formation for a solid-phase joint of high-strength materials through interlayers based on the MF of intermetallic-forming elements is proposed. 相似文献
5.
We have used metallography, x-ray diffraction, and electron-probe microanalysis to plot isothermal cross sections at 750°C and 600°C for the phase diagram of the ternary Fe – Mo – Ti system in the titanium-rich alloy region. We have established that at these temperatures, molybdenum lowers the solubility of iron in α‐titanium and expands the β ‐region. In grains of α‐titanium with composition near the boundary between α and α + β phase regions, a plate martensite‐like structure is formed. 相似文献
6.
The possibility of obtaining Pb(Zr,Ti)O3 (PZT) films by oxidation of Pb ― Zr ― Ti layers was investigated. The films were obtained by vacuum evaporation on a polished SiO2 or glassceramics at 300-800 K. The PZT films obtained at 500 K were amorphous. With a rise in the condensation temperature to 600 K, film crystallization occurred in the perovskite structure. The dielectric and optical properties of PZT films were investigated. For metal ― dielectric ― metal (MDM) structures based on PZT films with a thickness of 0.8 μm, the capacity was 2.60 μF, which corresponds to a value of the dielectric constant of about 74,880. The energy-gap width determined by the short-wave boundary of self-absorption was equal to 3.5 eV. The advantages of the proposed method for obtaining PZT films are low deposition temperatures and the possibility of performing all technology in one cycle, including modification of the composition and properties of the films by doping. 相似文献
7.
Anatolii G. Kostornov 《Powder Metallurgy and Metal Ceramics》2003,42(11-12):563-567
The main aspects of theory for preparing materials from original components in a dispersed state that comprise the scientific bases of fiber metallurgy developed by Bal'shin are considered. This relates to ideas about features of the contribution of the flexibility and stiffness of structural elements to volumetric deformation of porous bodies with a fibrous structure; features of the compaction of objects made from fibers with respect to stress governed by fiber resistance to bending (the contact equation of compaction), and development of the elastic aftereffect accompanying this process; fundamental principles of forming a set of physicomechanical properties of porous fiber materials based on ideas about the contact (critical) cross section of a porous body. 相似文献
8.
高氯酸杂环配合物金属盐的激光起爆(英) 总被引:1,自引:1,他引:0
Mikhail A. Ilyushin Igor V. Tselinsky Irina V. Bachurin Emil Ya. Seidov Anatolii S. Kozlov Dmitrii V. Korolev Alexei E. Olenin 《含能材料》2006,14(6):401-405
1 IntroductionNowadays the electrical way of blast-caps initiation istraditional. But the devices used for this process are in-herently susceptible to an accident initiation by externalstimuli such as an electrostatic discharge (ESD), elec-tromagnetic interference (EMI), and radio wave irradia-tion (RI). Pulse laser initiation of explosives is a newperspective method. Pulse lasers provide practical meansof electrical isolation of the energetic materials, therebyeliminating hazards associat… 相似文献
9.
Anatolii Laptiev Barbara Romelczyk Oleksandr Tolochyn Tomasz Brynk Zbigniew Pakiela 《Advanced Powder Technology》2017,28(2):363-374
The studies of the consolidation, structure and mechanical properties of samples from two types of iron powder are carried out. The coarse and less pure PZH3M2 as well as fine and purer DIAFE5000 powders were used. The samples are obtained by means of impact sintering method in the temperatures range of 500–1100 °C. The impact energy was 1200 J/cm3, and the initial deformation velocity - 6.5 m/s. Samples are obtained in the form of disks with a diameter of 25–27 mm and 9–10 mm high. For carrying out different mechanical tests the bars were cut out from disks. The tensile, compression, three-point bend of notched samples tests were carried out, as well as the Brinell hardness was measured after the corresponding processing of the bars. The characteristics of strength and plasticity of samples depending on the impact sintering temperature are determined. The polished surface of different samples and the fracture surface are investigated. It is established that the high density of samples is reached at a temperature of 600 and 700 °C respectively for fine and coarse powders. The samples obtained at these impact sintering temperatures possess rather low electrical resistivity, high strength, hardness, but the lowered plasticity. Namely, the samples from the PZH3M2 and DIAFE5000 powders sintered at the temperature of 700 °C have respectively: ultimate tensile strength - 406 and 336 MPa, yield stress - 353 and 190 MPa, contraction ratio - 26 and 78%, limit stress (at the fracture) - 501 and 933 MPa, the maximum crack tip stress – 738 and 876 MPa, the fracture energy at a bend of the notched samples - 4.8 and 51.2 J/cm3 and also Brinell hardness - 1467 and 847 MPa. The increase of the samples impact sintering temperature leads to grain growth, decrease of the samples strength and increase of their plasticity. At the same time the structure of samples from the DIAFE5000 powder is more fine-grained than at samples from the PZH3M2 powder. 相似文献
10.
Andrew Yakimov Victor Kirienko Vladislav Armbrister Anatolii Dvurechenskii 《Nanoscale research letters》2013,8(1):217
We report the fabrication and characterization of a ten-period Ge quantum dot photodetector grown on SiGe pseudosubstrate. The detector exhibits tunable photoresponse in both 3- to 5- μm and 8- to 12- μm spectral regions with responsivity values up to about 1 mA/W at a bias of −3 V and operates under normal incidence radiation with background limited performance at 100 K. The relative response in the mid- and long-wave atmospheric windows could be controlled through the applied voltage. 相似文献