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    Wyświetlanie 1-3 z 3
    Tytuł:
    Electrochemical behavior and morphology of selected sintered samples of Mg65Zn30Ca4Pr1 alloy
    Autorzy:
    Hrapkowicz, Bartłomiej
    Lesz, Sabina
    Drygała, Aleksandra
    Karolus, Małgorzata
    Gołombek, Klaudiusz
    Babilas, Rafał
    Popis, Julia
    Gabryś, Adrian
    Młynarek-Żak, Katarzyna
    Garbiec, Dariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/27311410.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    magnesium
    SPS
    spark plasma sintering
    corrosion
    rare earth elements
    magnez
    pierwiastki ziem rzadkich
    korozja
    spiekanie plazmowe iskrowe
    Opis:
    In order to investigate the effect of the milling time on the corrosion resistance of the Mg65Zn30Ca4Pr1 alloy, powders of the alloy were prepared and milled for 13, 20, and 70 hours, respectively. The samples were sintered using spark plasma sintering (SPS) technology at 350◦C and pressure of 50 MPa. The samples were subjected to potentiodynamic immersion tests in Ringer’s solution at 37◦C. The obtained values of Ecorr were –1.36, –1.35, and –1.39 V, with polarization resistance Rp = 144, 189, and 101 Ω for samples milled for 13, 20 and 70 h, respectively. The samples morphology showed cracks and pits, thus signaling pitting corrosion.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 3; art. no. e145564
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of ceramic type reinforcement on structure and properties of Cu-Al2O3 composites
    Autorzy:
    Strojny-Nędza, A.
    Pietrzak, K.
    Gładki, A.
    Nosewicz, S.
    Jarząbek, D. M.
    Chmielewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201851.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal matrix composites
    spark plasma sintering
    thermal conductivity
    interfacial strength
    przewodność cieplna
    kompozyty metaliczne
    iskrowe spiekanie plazmowe
    Opis:
    The purpose of this paper is to elaborate on mechanical alloying conditions for a composite powder consisting of copper and brittle aluminium oxides. Detailed analysis of the Cu-Al2O3 powder mixture structure obtained in the mechanical alloying process allows for the study of the homogenization phenomena and for obtaining grains (in composite form) with a high degree of uniformity. The Cu-5vol.%Al2O3 composites were obtained by means of the spark plasma sintering technique. The results presented herein were studied and discussed in terms of the impact of using a different form of aluminium oxide powder and a different shape of copper powder on composite properties. Research methodology included microstructure analysis as well as its relation to the strength of Cu-Al2O3 interfaces. It transpires from the results presented below that the application of electrocorundum as a reinforcement phase in composites decreases porosity in the ceramic phase, thus improving thermal properties and interfacial strength.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 4; 553-560
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    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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