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    Wyświetlanie 1-3 z 3
    Tytuł:
    Synthesis and characterization of nanostructured molybdenum & tungsten carbide materials, and study of diffusion model
    Autorzy:
    Covington, L.
    Munirathinam, K.
    Islam, A. W.
    Roberts, K. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/778294.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    węglik molibdenu
    węglik wolframu
    reakcje z programowaniem temperatury
    fonochemia
    nanostruktura
    molybdenum carbide
    tungsten carbide
    temperature programmed reaction
    sonochemistry
    nanostructure
    Opis:
    Powders of two molybdenum carbides (Mo2C and MoC1-x) and tungsten carbide (WC) were prepared by means of temperature programmed reaction (TPR) method. Mo2C and MoC1-x were synthesized by reacting MoO3 with a preselected molar ratio of methane/hydrogen and carbon monoxide/hydrogen gas mixtures respectively. WC was prepared using tungsten oxide (WO3) and a methane/hydrogen gas mixture. These carbides were ultrasonically dispersed in de-ionized water. Samples were characterized using room temperature x-ray diffraction and scanning microscopy. A kinetic diffusion model is also studied to determine diffusivities in solids where the diffusing species desorbs or reacts at the external surfaces, and where the diffusivity does not vary appreciably with concentrations. The method involves measuring the flux of the diffusive species into the solid under the influence of a temperature program.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 1; 28-34
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystallization Process of Silicon Molybdenum Cast Iron
    Autorzy:
    Stawarz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379482.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    metallographic analysis
    molybdenum carbide
    thermal derivative analysis
    SiMo
    teoria krystalizacji
    analiza metalograficzna
    węglik molibdenu
    analiza termiczna
    analiza derywacyjna
    Opis:
    The article presents results of studies of silicon – molybdenum cast iron (4.42% Si, 2.59% Mo and 2.48% C wt.-%) crystallization process. Metallographic analysis was carried out using SEM-scanning electron microscopy with the EDS system. In order to determine the phase composition, X-ray diffraction studies were performed. Thermo-Calc, a computer simulation program, was used to simulate the crystallization process. . The obtained data allowed to describe the effect of some elements on the crystallization process. The silicon phase of MnSi could not be identified during metallographic studies. Also, computer simulation of the crystallization process did not answer the question at which point the silicon phase of MnSi crystallizes in the tested alloy. Therefore, not all results obtained were linked to the registered crystallization process (TDA process). The EDS analysis revealed an unusual distribution of molybdenum in the microstructure of the sample, where it is clearly visible that the area enriched with this element is also the separation of spheroidal graphite. The possibility of occurrence of Mo-rich micro-areas found in graphite is considered. The case is debatable and difficult to resolve at this stage. Perhaps, at such a high concentration of molybdenum (2.59% Mo) in the alloy, conditions are created for simultaneously crystallization of graphite and molybdenum phases.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 2; 100-104
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and corrosion resistance of Co-Cr-Mo alloy used in Birmingham Hip Resurfacing system
    Autorzy:
    Dobruchowska, E.
    Paziewska, M.
    Przybyl, K.
    Reszka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/306647.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    stopy kobaltu
    stopy chromu
    stopy molibdenu
    karbid
    odporność korozyjna
    polaryzacja potencjodynamiczna
    stal nierdzewna
    stal azotowana
    cobalt-chromium-molybdenum alloy
    Birmingham Hip Resurfacing
    carbide
    precipitation
    corrosion resistance
    potentiodynamic polarisation
    nitrided stainless steel
    Opis:
    The endoprostheses made of cobalt-chromium-molybdenum (Co-Cr-Mo) alloys belong to the group of the most popular metallic implants used for hip joints reconstruction. For such biomaterials, the primary goal is correct and long-term functioning in the aggressive environment of body fluids. Therefore, the purpose of this study was to examine both the morphology and the corrosion resistance of implants made of the cobalt alloy used in Birmingham Hip Resurfacing (BHR) system (Smith & Nephew). For comparative purposes, the electrochemical studies were done for the nitrided stainless steel – Orthinox. Methods: Observations of the microstructure of the investigated material were performed by means of the optical metallographic microscope and the scanning electron microscope. Furthermore, Energy Dispersive X-ray Spectroscopy was used to analyse the chemical composition of the endoprosthesis. Characterisation and evaluation of electrochemical corrosion resistance of the selected alloys were performed by potentiodynamic polarisation tests. Results: The structural studies confirmed that Co-Cr-Mo (BHR system) is characterised by a typical dendritic microstructure with carbide precipitates, mainly M23C6, within the interdendritic areas. Results of the polarisation measurements showed that the investigated cobalt alloy exhibits lower corrosion potential than Orthinox in the utilised environments (3% NaCl, simulated body fluid – Hank’s Body Fluid). Conclusions: However, the high passivation ability of the Co-Cr-Mo alloy, as well as its resistance to the initiation and propagation of localised corrosion processes, indicate that this material is significantly more appropriate for long-term implants.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 2; 31-39
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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