Temat: węglik molibdenu - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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