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    Wyświetlanie 1-7 z 7
    Tytuł:
    Mechanical Properties and Lattice Parameters of $Lu_{2x}Gd_{2(1-x)}SiO_{5}:Ce$ Scintillation Crystals
    Autorzy:
    Maksimchuk, V.
    Baumer, V.
    Bondar, V.
    Galich, Yu.
    Kurtsev, D.
    Sidletskiy, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550446.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.-x
    29.40.Mc
    Opis:
    Structural and mechanical characteristics of complex oxide compounds $Lu_{2x}Gd_{2-2x}SiO_{5}:Ce$ (LGSO) crystals were studied at different cation ratio in the host. For this purpose, a series of LGSO crystals with Lu concentration 5-70 at.% has been grown by the Czochralski method. Anisotropy of mechanical properties for these materials has been studied. The obtained results can be useful at choice of optimal growth direction for crystals and at mechanical processing of scintillation elements.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 146-149
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Nanoscale TiN/MoN Multilayered Systems, Fabricated Using Arc Evaporation
    Autorzy:
    Pogrebnjak, A.
    Bondar, O.
    Abadias, G.
    Eyidi, D.
    Beresnev, V.
    Sobol, O.
    Postolnyi, B.
    Zukowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402193.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.-w
    62.20.Qp
    62.25.-g
    Opis:
    Using the vacuum-arc evaporation method we fabricated periodic multilayered TiN/MoN structures with different bilayer periods λ ranging from 8 to 100 nm. We found that molybdenum nitride and titanium nitride layers grown on steel show local partial epitaxy and columnar growth across interfaces. A molybdenum-titanium carbide interlayer was evidenced between the substrate and the multilayer. Molybdenum nitride and titanium nitride layers contain small (5÷30 nm) grains and are well crystallized with (100) preferred orientation. They were identified as stoichiometric fcc TiN and cubic γ-M₂N. Non-cubic molybdenum nitride phases were also detected. The hardness of the obtained structures achieved great values and maximal hardness was 31÷41.8 GPa for the multilayered structure with a 8 nm period. Hardness of the obtained coatings is 25÷45% higher in comparison with the initial single-layer nitride coatings, plasticity index of multilayered structure is 0.075.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 836-840
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Research of Superhard (Zr-Ti-Cr-Nb)N Coatings
    Autorzy:
    Bondar, O.
    Postolnyi, B.
    Kravchenko, Yu.
    Shypylenko, A.
    Sobol, O.
    Beresnev, V.
    Kuzmenko, A.
    Zukowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402215.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.-w
    62.20.Qp
    Opis:
    This work presents the results of (Zr-Ti-Cr-Nb)N superhard coatings research. The samples were fabricated by the vacuum-arc deposition method (Arc-PVD). Structure, composition and properties of these coatings were studied. The study of coatings was carried out using scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. Hardness measurements and adhesion tests were performed. The coatings thickness was up to 6.2 μ m, nanocrystallites sizes ranged from 4 to 7.3 nm. Values of hardness and cohesive strength were H=43.7 GPa and $L_{C}$=62.06 N, respectively. The optimal conditions for coating deposition were found.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 867-870
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Temperature Annealing of Ion-Plasma Nanostructured Coatings Based on $AlN-TiB_2(TiSi_2)$
    Autorzy:
    Pogrebnjak, A.
    Abadias, G.
    Bondar, O.
    Sobol, O.
    Beresnev, V.
    Pshyk, A.
    Demianenko, A.
    Belovol, K.
    Kolesnikov, D.
    Komsta, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1365953.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.Dv
    68.37.-d
    62.20.-x
    Opis:
    The coatings investigated in this paper were deposited via the magnetron sputtering of $AlN-TiB_2-Ti-Si_2$ target in Ar atmosphere. The investigation of structural-phase composition, element composition, morphology and mechanical properties before and after annealing up to 1350°C was carried out. The concentration of elements in the coating was changed after annealing at 900°C and further annealing at 1350°C (especially after annealing at 1350°C). The hardness of as-deposited coatings was 15 GPa, but after annealing at 1350°C the value of hardness increased up to 22÷23.5 GPa. The value of the viscoplastic index was 0.07. All this provide high damping properties of the coating, and amorphous-like structure makes promising the use of these coatings as diffusion barriers in the form of independent elements, and as a contacting layer in multilayer wear resistant coatings.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1284-1287
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Properties of Multilayer Nanostructured Coatings TiN/MoN Depending on Deposition Conditions
    Autorzy:
    Pogrebnjak, A.
    Abadias, G.
    Bondar, O.
    Postolnyi, B.
    Lisovenko, M.
    Kyrychenko, O.
    Andreev, A.
    Beresnev, V.
    Kolesnikov, D.
    Opielak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1365941.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.-w
    62.20.Qp
    62.25.-g
    Opis:
    This work presents the results of TiN/MoN coatings studying. These multilayer nanostructured coatings demonstrate dependence on depositions conditions on nanometer level. The influence of nanosized monolayer thickness on structure changing and properties of nanocomposite multilayer coatings TiN/MoN was found. Multilayer TiN/MoN coatings of the total thickness from 6.8 to 8.2 μm were obtained using C-PVD method. Thicknesses of monolayers were 2, 10, 20, 40 nm. The structure of samples was studied using X-ray diffraction (Bruker D-8 Advance) in Cu $K_{α}$ radiation, high resolution transmission electron microscopy with diffraction CFEI EO Techai F200, scanning electron microscopy with energy dispersive X-ray spectroscopy (JEOL-7001F), and microhardness measurements in dependence on indenter load. Scratch tests (friction, wear, etc.) were also provided using Rockwell-C diamond indenter (CSM Revetest Instruments) with a tip radius of 200 μm. Friction and wear behavior were evaluated using ball-on-plate sliding test on a UMT-3MT tribometer (CETR, USA). With decreasing monolayer thickness the hardness value increases, and the size of nanograins reduces. The values obtained for the friction coefficient of the multilayer system is much smaller than in nanostructured coatings of TiN (nc) or MoN (nc). Annealing showed formation of a (Ti,Mo)N solid solution and small growth of nanocrystals.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1280-1283
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multicomponent (Ti-Zr-Hf-V-Nb)N Nanostructure Coatings Fabrication, High Hardness and Wear Resistance
    Autorzy:
    Pogrebnjak, A.
    Beresnev, V.
    Kolesnikov, D.
    Bondar, O.
    Takeda, Y.
    Oyoshi, K.
    Kaverin, M.
    Sobol, O.
    Krause-Rehberg, R.
    Karwat, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400429.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.-w
    62.20.Qp
    62.25.-g
    Opis:
    First results in the field of synthesis and research of the multicomponent (Ti-Zr-Hf-V-Nb)N nanostructured coatings are presented in the paper. Influence of processes of spinodal segregation and mass-transfer on single-layered or multilayered crystal boundary (second phase) forming were explored. Superhard nanostructured coatings were investigated before and after annealing at the temperature 600°C using unique methods (slow positron beam, proton microbeam particle induced X-ray emission-μ, Rutherford backscattering-analysis, scanning electron microscopy with energy dispersive X-ray spectroscopy, X-ray diffraction analysis was performed using DRON-4 and nanoindentor). Diffraction spectra were taken point-by-point, with a scanning step 2Θp=0.05 to 0.1°. We detected that positron trapping by defects was observed on the nanograins boundaries and interfaces (vacancies and nanopores which are the part of triple and larger grain's boundary junction). The 3D distribution maps of elements obtained by the proton microbeam (particle induced X-ray emission-μ) together with the results obtained by slow positron microbeam gave us comprehensive information about physical basis of the processes, connected with diffusion and spinodal segregation in superhard coatings.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 816-818
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Deposition Parameters and Thermal Annealing on the Structure and Properties of Nitride Coatings (TiHfZrVNb)N
    Autorzy:
    Pogrebnjak, A.
    Abadias, G.
    Chartier, P.
    Bondar, O.
    Yakuschenko, I.
    Takeda, Y.
    Krause-Rehberg, R.
    Kolesnikov, D.
    Beresnev, V.
    Partyka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1365973.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.-w
    62.20.Qp
    62.25.-g
    Opis:
    Results of structure, phase composition, physical and mechanical properties and tribological properties investigations of nitride high-entropy coatings (TiZrHfVNb)N are presented in the paper. Proton microbeam (μ-PIXE), X-ray diffraction method, including method of X-ray strains measurements, energy dispersive X-ray spectroscopy and scanning electron microscopy analysis, microhardness testing and nanoindentation were used. Thermal annealing (t=600°C) influence on defect profiles, structure and element distribution in the coatings was investigated. It was found that thermal treatment of coatings leads to changing of defect profiles and to element redistribution. Also we can say that it influences less on grain size changing. Investigated (TiZrHfVNb)N coatings demonstrate high values of hardness and excellent wear resistance.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1296-1298
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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