研究TiO2电化学还原法提取金属钛的阴极制备参数--饶结温度和烧结时间.采用SEM、EDS等方法研究烧结温度、烧结时间对TiO2阴极微观结构、孔隙率的影响及不同烧结条件下TiO2阴极电解产物结构和氧含量的变化.结果表明:烧结条件主要影响电极的粒度大小、孔隙尺寸和孔隙分布:在较高温度下烧结较长时间获得的电极片粒度较粗,而孔隙率的变化比较复杂.电极的颗粒尺寸、孔隙率直接影响脱氧率:粒度较小的电极在试验条件下可被充分还原;电极中的开孔和闭孔都有利于电化学还原过程的进行.在1000～1100℃下烧结4 h获得的TiO2阴极脱氧效果较好.
The sintering parameters of cathode preparation for the process of electrochemical reduction of TiO2 to titanium such as the temperature and the time were investigated. The SEM and EDS methods were used to study the influences of sintering temperature and time on the microstructure and porosity of the TiO2 compacts;moreover, the influences on the microstructure and oxygen content of the electrochemical reduction products were studied. The sintering parameters mainly affect the particle size,porosity and pore distribution of the cathodes. The compact with coarser grain size can be obtained when sintered at higher temperature and for longer time;while the change of the porosity in the compact is complex under different sintering conditions. The oxygen content of the electrochemical-reduced products depends on the grain size and the porosity of the sintered compacts. The compacts with small grains, used as cathode samples can be fully reduced;both open pores and closed pores in the samples are favorable to the electro-reduction process. The proper cathode preparation condition is that the greens are sintered at 1000-1100 ℃ for 4 h according to the results of the experiments.
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