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Abstract
Chromium carbides were synthesized by direct electrolysis of non-sintering Cr2O3/C precursors in CaCl2 molten at 1123K. A series of electrolysis experiments were conducted with different Cr2O3/C molar ratios, cell voltages and electrolysis time. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) techniques, respectively. The results showed that the single-phase Cr7C3 powders with a mean diameter of <200nm were prepared after electrolysis at 2.8V for 5h in 1123K CaCl2 melt. By prolonging the electrolysis time to 10h, the product was converted into a Cr7C3 and Cr3C2 composite. Carbon was not only used as a raw material, but could also accelerate the rate of electrochemical reduction of Cr2O3. The reaction procedure forming the chromium carbides involved the electro-deoxidation of Cr2O3 and combined with carbon simultaneously.
Published Version
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