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    Wyświetlanie 1-3 z 3
    Tytuł:
    Manufacturing of Al Alloy Matrix Composite Materials Reinforced with MAX Phases
    Autorzy:
    Dmitruk, A.
    Naplocha, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/382950.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MAX phase
    SHS synthesis
    microwave
    porous structure
    squeeze casting
    faza MAX
    synteza SHS
    mikrofala
    struktura porowata
    Opis:
    A method for manufacturing of Al-Si alloy (EN AC-44200) matrix composite materials reinforced with MAX type phases in Ti-Al-C systems was developed. The MAX phases were synthesized using the Self-propagating High-Temperature Synthesis (SHS) method in its microwave assisted mode to allow Ti2AlC and Ti3AlC2 to be created in the form of spatial structures with open porosity. Obtained structures were subjected to the squeeze casting infiltration in order to create a composite material. Microstructures of the produced materials were observed by the means of optical and SEM microscopies. The applied infiltration process allows forming of homogeneous materials with a negligible residual porosity. The obtained composite materials possess no visible defects or discontinuities in the structure, which could fundamentally deteriorate their performance and mechanical properties. The produced composites, together with the reference sample of a sole matrix material, were subjected to mechanical properties tests: nanohardness or hardness (HV) and instrumental modulus of longitudinal elasticity (EIT).
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 2; 198-202
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The composition of reaction substrates for TiC carbides synthesis and its influence on the thickness of iron casting composite layer
    Autorzy:
    Olejnik, E.
    Janas, A.
    Kolbus, A.
    Sikora, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/380875.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite layer
    composite in situ
    SHS process
    solidification process
    superficial layer
    cast iron
    TiC carbides
    warstwa kompozytowa
    kompozyt in situ
    synteza wysokotemperaturowa
    proces krzepnięcia
    warstwa powierzchniowa
    żeliwo
    Opis:
    The effect of reaction substrates for the TiC carbide synthesis on the composite layer thickness produced in cast iron was examined. It was found that, at a constant weight of the charge amounting to 0.5 kg, changing the weight of the, placed in mould, stoichiometric mixture of titanium carbide (from 0.01 to 0.04 kg) changed the thickness of the composite layer from 1 to 15 mm. Carbides synthesis starts directly in mould induced by the temperature of molten alloy poured into this mould (1700 K). The TiC carbides formed in this reaction are later, i.e. during alloy solidification, acting as a base composite material. The size of TiC carbides obtained in the synthesis is from 1 to 10 μm. They occur in the layers as locally compact and coagulated forms. Microstructure, chemical composition and structure of the obtained materials were tested by scanning electron microscopy (SEM), X-ray microanalysis (EDS), and X-ray diffraction (XRD).
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 165-168
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelectric properties of bismuth-doped magnesium silicide obtained by the self-propagating high-temperature synthesis
    Autorzy:
    Bucholc, Bartosz
    Kaszyca, Kamil
    Śpiewak, Piotr
    Mars, Krzysztof
    Kruszewski, Mirosław J.
    Ciupiński, Łukasz
    Kowiorski, Krystian
    Zybała, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/2173670.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelectric materials
    magnesium silicide
    bismuth doping
    SHS
    self-propagating high-temperature synthesis
    spark plasma sintering
    materiały termoelektryczne
    krzemek magnezu
    doping bizmutem
    samorozwijająca się wysokotemperaturowa synteza
    iskrowe spiekanie plazmowe
    Opis:
    Doping is one of the possible ways to significantly increase the thermoelectric properties of many different materials. It has been confirmed that by introducing bismuth atoms into Mg sites in the Mg2Si compound, it is possible to increase career concentration and intensify the effect of phonon scattering, which results in remarkable enhancement in the figure of merit (ZT) value. Magnesium silicide has gained scientists’ attention due to its nontoxicity, low density, and inexpensiveness. This paper reports on our latest attempt to employ ultrafast self-propagating high-temperature synthesis (SHS) followed by the spark plasma sintering (SPS) as a synthesis process of doped Mg2Si. Materials with varied bismuth doping were fabricated and then thoroughly analyzed with the laser flash method (LFA), X-ray diffraction (XRD), scanning electron microscopy (SEM) with an integrated energy-dispersive spectrometer (EDS). For density measurement, the Archimedes method was used. The electrical conductivity was measured using a standard four-probe method. The Seebeck coefficient was calculated from measured Seebeck voltage in the sample subjected to a temperature gradient. The structural analyses showed the Mg2Si phase as dominant and Bi2Mg3 located at grain boundaries. Bismuth doping enhanced ZT for every dopant concentration. ZT = 0.44 and ZT=0.38 were obtained for 3wt% and 2wt% at 770 K, respectively.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 3; art. no. e141007
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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