| Titanium carbide is transitional metal carbide.It has high melting point,high hardness,high stability under high temperature,mechanical stability and so on.At room temperature,its chemical properties is also very stable,and it can resist various chemical corrosion.This type of carbide is also conductive similar to its parent metal and magnetic.It is widely used in daily life and military industry and so on.According to the drawbacks of FFC method in the preparation of TiC,in this present,we proposes a new process to preparae titanium carbide,in which Na2TiO3 and C is used as raw materials through electrochemical method,and this new process are studied.According to the performance of the cathode in the molten salt immersion and electrolysis,the effect of the molding pressure,sintering temperature and sintering time on cathode preparation is investigated.Consequently,we find that the suitable conditions of the cathode preparations are:40 MPa for molding,900? and 2 hours for sintering.The electrochemical reduction of Na2TiO3 and C to titanium carbide was studied with the cyclic voltammetry,we found that the electrochemical reduction process was as follows.Firstly,calcium titanate was generated by the reaction between Na2TiO3 and CaCl2 Secondly,the titanium in calcium titanate changed from Ti4+ to Ti3+,then from Ti3+ to Ti2+,continuly fromTi2+ to Ti;At last,titanium embedded into graphite and TiC was formed by the reaction between them;Applying down potential of TiO2 decomposition,the results reveals that CaTiO3 can be found under low potential electrolysis.And XRD analysis of production revealed that the process of calcium titanate electrochemical reduction was as follows.Firstly,part of the CaTiO3 changeed to TiO and the rest changed to low titanium oxide;Then disproportionation reaction between TiO and a part of high oxide titanium took place.Finally,the disproportionation product changed to TiO by electrical deoxygenization,and then it was deoxidized to Ti metal. |
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