高频感应炉制备碳化钛粉的研究

Preparation of titanium carbide powders in high-frequency induction furnace

以颜料级二氧化钛和木炭为原料,探索一种高频感应碳热还原制备超细碳化钛粉末的新方法,并借助XRD,SEM/EDS,原子吸收光谱仪,X射线荧光光谱仪以及激光粒度分析仪等设备对粉末进行表征。结果表明,原料二氧化钛和木炭在很短的时间内充分反应并制备出低杂质含量的超细碳化钛粉末,反应温度为1490～1510℃,粒度分布(D50)在1～10μm之间,粉末颗粒形状一致,分布均匀且无大块团聚现象。晶格常数计算表明,原料配比为1∶3时制备的碳化钛粉末中可能存在亚化学计量的TiCx(x<1)。当原料配比为1∶4时制备出化学计量的碳化钛粉末(TiC1.0)。

Formation of ultrafine TiC powders by carbothermal reduction of titania and charcoal in high-frequency induction furnace was investigated by XRD, SEM/EDS, atomic Absorption spectrometer, XRF as well as laser particle sizer. The result indicates that ultrafine TiC powders with low impurities was prepared at temperature range 1490-1510℃ for a short time. The surface of TiC particles is homogeneous and loose agglomeration while the grain size （D50） is about 1-10μm. Lattice parameter calculation indicates that sub-stoichiometric TiCx（x1） should exist in TiC powders when n（TiO2）∶n（C）=1∶3. But stoichiometric TiC1.0 was prepared when n（TiO2）∶n（C）=1∶4.