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Wyszukujesz frazę "Si" wg kryterium: Temat

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Thermoplastic hardened Cu-Ni-Si-Ag alloy
    Autorzy:
    Krupińska, Beata
    Chulist, Robert
    Kondracki, Marcin
    Labisz, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2204523.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    modification
    structure
    CuNi2Si1 alloy
    thermo-plastic treatment
    CuNi2Si1
    stop CuNi2Si1
    modyfikacja
    obróbka termoplastyczna
    struktura
    Opis:
    The paper aims to investigate the influence of silver addition on the microstructure of CuNi2Si1 alloys. The investigated copper alloy was cast and then supersaturated, plastically deformed on the Gleeble 3800 simulator and finally aged. Structural changes were examined using optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Orientation mapping was completed with FEI Quanta 3D field emission gun scanning electron microscope (SEM) equipped with TSL electron backscattered diffraction (EBSD) system. The effect of structural and microstructural changes on hardness and conductivity was also investigated. Based on the mechanical tests it was found that the mechanical properties and conductivity are improved due to heat and plastic treatment. It was also found that the precipitation hardening raises the hardness to the level of 40% whilst an increase in conductivity by 20% is observed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 2; art. no. e145683
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Si morphology in AlSi21CuNiMg cast alloy using col our and deep etching
    Autorzy:
    Tillová, Eva
    Chalupová, Mária
    Kuchariková, Lenka
    Bonek, Mirosław
    Uhríčik, Milan
    Pastierovičová, Lucia
    Powiązania:
    https://bibliotekanauki.pl/articles/2204522.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si cast alloy
    primary silicon
    deep etching
    morphology
    krzem pierwotny
    głębokie trawienie
    morfologia
    odlewnicze stopy Al-Si
    silumin
    odlewniczy stop aluminium z krzemem
    alpaks
    odlewnicze stopy aluminium Al-Si
    Opis:
    The effect of possible modification and refining effect of Al-Cu-P-based pre-alloy combined with Fe on the microstructure and the silicon morphology change in hypereutectic Al-Si cast alloy was studied. The samples in the as-cast state were observed by optical and scanning electron microscopy with energy-dispersive X-ray spectroscopy. The 3D morphology of both primary and eutectic silicon was observed by using colour and deep etching in detail. The results showed that the AlCu19P1.4 pre-alloy (1.07 wt.%) combined with the addition of Fe (0.02 wt.%) has a significant effect on the change of the amount, size and morphology of primary Si. This is significantly refined and changes the shape from a coarse irregular star-shaped, polyhedral, or plate-like shape to a fine polyhedral shape. The average size of the primary Si is reduced by about of 78 % from 135 μm to 28 μm and the number of primary Si particles increased from 7.4 to 237. No change in the morphology of the eutectic Si was observed; a refinement of the structure from a coarse needle/plate-like to a fine plate-like structure was seen. The depth etching method using HCl was very effective in the study of the 3D silicon morphology observed, which could be observed in detail without the presence of artefacts.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 2; art. no. e144618
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental research on influence of gas impact on thermal and mechanical properties of auxetic material covered with titanium silicide coating
    Autorzy:
    Miedzińska, D.
    Gieleta, R.
    Małek, E.
    Zasada, D.
    Stankiewicz, M.
    Marszałek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/201182.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ti-Si layers
    damage
    impact
    thermal resistance
    SEM
    auxetic materials
    Ti-Si
    uszkodzenia
    uderzenia
    opór cieplny
    materiały auksetyczne
    Opis:
    The aim of the presented work was to study the auxetic textiles covered with titanium silicide coating. The research was carried out to develop the material structure, which will be used for protective clothing, e.g. for firemen. The new material should be characterized by increased heat resistance coupled with protection against gas pressure impact caused e.g. by gas installation damage. In the paper, an assessment of the change in heat resistance properties of a Ti-Si coated auxetic textile loaded with gas pressure impulse was carried out.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 2; 165-172
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SI-Studio : environment for SI circuits design automation
    Autorzy:
    Szczęsny, S.
    Naumowicz, M.
    Handkiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/201671.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SI circuits
    layout
    AMPLE
    analogue circuits
    design automation
    Opis:
    The current work is an answer to the problem of designing switched-current (SI) circuits, which is usually a complex issue in the field of microelectronics. The mentioned task is a source of many mistakes and takes a lot of time for designers, therefore authors of the article decided to propose a software solution. This article presents an environment for design automation of analogue circuits in the switched currents technique. It points out the utility advantages of the described tools, which make the work of a VLSI designer much easier, moreover offering a possibility to parameterise the design process considering power consumption, chip area usage and its working speed. It also presents results of an automatic generation of a filter pair circuit, as well as a DCT circuit - automatically generated with the proposed SI-Studio software tools.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 757-762
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion behavior of ZrC particles reinforcement with Al-12Si composites by weight loss method using acidic media
    Autorzy:
    John, C. F.
    Paul, R. C.
    Singh, S. C. E.
    Jacobjose, J.
    Ramkumar, T.
    Hikku, G. S.
    Sharma, R. K.
    Sengottuvel, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/200059.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si-ZrC composites
    powder metallurgy
    weight loss method
    corrosion rate
    SEM
    kompozyty Al-Si-ZrC
    metalurgia proszków
    metoda redukcji masy
    szybkość korozji
    Opis:
    This paper aims to investigate the corrosion behavior of zirconium carbide (ZrC) reinforced Al – Si metal matrix composites (MMCs) in a mixture of acidic solution using weight loss method. The composites are prepared by powder metallurgy method. Al-12Si-xZrC composites containing 0, 5, and 10 weight percentage of ZrC particles are compacted in a die set assembly and sintered in an inert gas muffle furnace. The acidic solutions used for corrosion are 1 N HCl, 1 N H2SO4 and 1 N HNO3. The corrosion characteristics of Al-12Si-xZrC composites and the pure Al were experimentally evaluated. The corrosion test was carried out at different weight proportions of the samples in various concentrations of the acid such as 1 N HCl, 1 N H2SO4 and 1 N HNO3 for different exposure time (i.e., 24 h, 72 h, 144 h and 216 h), respectively. The results specified that corrosion rate of composites was lower than that of base metal Al under the corrosive atmosphere, regardless of exposure time and acidic solutions used as corrodents. Al-12Si-xZrC composites become more corrosion resistant as the ZrC content is increased. This is because of the development of stable oxide layer above the specimens. Scanning electron microscopy (SEM) confirms the degree of attack of acidic solution on the surface of the examined material.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 9-16
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Si/ZnO nanorods with Ag nanoparticles/AZO heterostructures in PV applications
    Autorzy:
    Gwóźdź, K.
    Płaczek-Popko, E.
    Gumienny, Z.
    Zielony, E.
    Pietruszka, R.
    Witkowski, B. S.
    Wachnicki, Ł.
    Gierałtowska, S.
    Godlewski, M.
    Chang, L. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/201432.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solar cells
    ZnO
    Si
    heterojunction
    nanorods
    nanoparticles
    ogniwa słoneczne
    nanopręty
    nanocząstki
    Opis:
    Our studies focus on test structures for photovoltaic applications based on zinc oxide nanorods grown using a low-temperature hydrothermal method on a p-type silicon substrate. The nanorods were covered with silver nanoparticles of two diameters – 20–30 nm and 50–60 nm – using a sputtering method. Scanning electron microscopy (SEM) micrographs showed that the deposited nanoparticles had the same diameters. The densities of the nanorods were obtained by means of atomic force microscope (AFM) images. SEM images and Raman spectroscopy confirmed the hexagonal wurtzite structure of the nanorods. Photoluminescence measurements proved the good quality of the samples. Afterwards an atomic layer deposition (ALD) method was used to grow ZnO:Al (AZO) layer on top of the nanorods as a transparent electrode and ohmic Au contacts were deposited onto the silicon substrate. For the solar cells prepared in that manner the current-voltage (I-V) characteristics before and after the illumination were measured and their basic performance parameters were determined. It was found that the spectral characteristics of a quantum efficiency exhibit an increase for short wavelengths and this behavior has been linked with the plasmonic effect.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 3; 529-533
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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