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    Wyświetlanie 1-3 z 3
    Tytuł:
    Analysis of crystallite size changes in a hematite and magnetite formed on steel used in the power idustry
    Autorzy:
    Gwoździk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/297993.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    10CrMo9-10 steel
    hematite
    magnetite
    X-ray diffraction
    crystallite sizes
    Opis:
    The paper presents results of studies on the crystallite sizes of oxide layer formed during a long-term operation on 10CrMo9-10 steel at an elevated temperature (T = 545° C, t = 200,000 h). This value was determined by a method based on analysis of the diffraction line profile, according to a Scherrer formula. The oxide layer was studied on a surface and a cross-section at the outer and inner site on the pipe outlet, at the fire and counter-fire wall of the tube. X-ray studies were carried out on the surface of a tube, then the layer’s surface was polished and the diffraction measurements repeated to reveal differences in the originated oxides layer.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2018, 21(1); 65-73
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes of crystallite sizes in the oxide layer forming during long-term operation of 10CrMo9-10 steel
    Autorzy:
    Gwoździk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/298126.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    10CrMo9-10 steel
    oxide layer
    X-ray diffraction
    crystallite sizes
    Opis:
    The paper contains results of the studies on X-ray diffraction analysis XRD (studying the phase composition, crystallite sizes) of oxide layers on 10CrMo9-10 steel, operated for a long time at an elevated temperature (T = 525°C, t = 200,000 h). The oxide layer was studied on a surface and a cross-section at the outer on the inlet both on the fire and counter-fire side of the tube wall surface. X-ray studies were carried out on the outer surface of a tube, and then the layer surface was polished down and the diffraction measurements were performed again to determine crystallite size in oxide layers. Based on the width and the position of the main coat and substrate reflections, the size of the crystallites was determined using the Scherrer formula.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(3); 289-296
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Milling Time on the Crystallite Size of AlSi5Cu2/SiC Composite Powder
    Autorzy:
    Suśniak, M.
    Pałka, P.
    Karwan-Baczewska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/958211.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al/SiC composites
    crystallite size determination
    mechanical alloying
    nanocomposite
    Scherrer equation
    X-ray diffraction
    Opis:
    AlSi5Cu2/SiC nanocrystalline composite powder was successfully obtained by mechanical alloying of AlSi5Cu2 chips with reinforcement of 0, 10, 15, 20 wt. % of silicon carbide. X-ray powder diffraction was used to characterize obtained material. Detailed analyses using transmission and scanning electron microscopy have been conducted in order to collaborate the grain size measurement determined from the XRD analyses. Powders produced in a planetary ball mill with milling time: 1, 5, 10, 15, 20 and 40 hours, have shown shape and size evaluation during mechanical alloying process. It can be seen tendency to decrease the size of the grain as the milling time is increased. It is also noted that the grains of composites (AlSi5Cu2/SiC) are smaller than samples prepares without SiC addition. 40 hours of milling lead to formed very small grains of Al phase (20 nm in average) in composite powder.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 977-980
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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