| Autor: |
Yan, X. Y., Pownceby, M. I., Cooksey, M. A., Lanyon, M. R. |
| Předmět: |
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| Zdroj: |
Transactions - Institution of Mining & Metallurgy. Section C. Mineral Processing & Extractive Metallurgy; Mar2009, Vol. 118 Issue 1, p23-34, 12p, 1 Black and White Photograph, 4 Diagrams, 1 Chart, 5 Graphs |
| Abstrakt: |
Porous TiC nanoparticles have been synthesised from sintered pellets comprising a powder mixture of TiO2 and graphite by electrodeoxidation in molten CaCl2–NaCl eutectic. Electrolysis was conducted at 850°C in argon at an applied constant voltage of 3·1 V. The formation of TiC from the oxides/C mixture occurred at less cathodic potentials than those for electrodeoxidation of TiO2 to titanium metal. No titanium metal was observed during electrolysis, as confirmed by XRD. These findings were consistent with the thermodynamic predictions. It was found that CaTiO3 was formed during electrolysis and all the titanium oxides disappeared after 4 h electrolysis in a eutectic CaCl2–NaCl melt at 850°C, leaving CaTiO3/C/TiC mixtures behind at the cathode. It was also found that the formed CaTiO3 was electrodeoxidised to form TiC by prolonged electrolysis. The present results further demonstrated that an adhesive layer of Ti0·55C0·45 was formed on graphite substrates by electrodeoxidation of TiO2 on the substrates. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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