- 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