Electrolytic Production of Ti^sub 5^Si^sub 3^/TiC Composites by Solid Oxide Membrane Technology

This paper investigated the electrolytic production of Ti5Si3/TiC composites from TiO2/SiO2/C in molten CaCl2. The solid-oxide oxygen-ion-conducting membrane tube filled with carbon-saturated liquid tin was served as the anode, and the pressed spherical TiO2/SiO2/C pellet was used as the cathode. Th...

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Bibliographic Details
Published in:JOM (1989) 2018-02, Vol.70 (2), p.138-143
Main Authors: Zheng, Kai, Zou, Xingli, Xie, Xueliang, Lu, Changyuan, Chen, Chaoyi, Xu, Qian, Lu, Xionggang
Format: Article
Language:English
Subjects:
Alloys
Calcium chloride
Calcium titanate
Carbon
Cathodes
Efficiency
Electrowinning
Energy consumption
Plasma sintering
Reaction mechanisms
Scanning electron microscopy
Silicon carbide
Silicon dioxide
Temperature
Titanium carbide
Titanium oxides
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Summary:This paper investigated the electrolytic production of Ti5Si3/TiC composites from TiO2/SiO2/C in molten CaCl2. The solid-oxide oxygen-ion-conducting membrane tube filled with carbon-saturated liquid tin was served as the anode, and the pressed spherical TiO2/SiO2/C pellet was used as the cathode. The electrochemical reduction process was carried out at 1273 K and 3.8 V. The characteristics of the obtained cathode products and the reaction mechanism of the electroreduction process were studied by a series of time-dependent electroreduction experiments. It was found that the electroreduction process generally proceeds through the following steps: TiO2/SiO2/C → Ti2O3, CaTiO3, Ca2SiO4, SiC → Ti5Si3, TiC. The morphology observation and the elemental distribution analysis indicate that the reaction routes for Ti5Si3 and TiC products are independent during the electroreduction process.
ISSN:1047-4838
DOI:10.1007/s11837-017-2693-z