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分别以钛酸四丁酯和蔗糖为钛源、碳源,采用溶胶—凝胶法制备前驱体并在真空条件下原位碳热还原制备纳米碳化钛。采用X射线衍射仪和扫描电镜对产物物相、形貌进行分析,并根据谢乐公式计算所得TiC晶粒尺寸。结果表明:在1 300℃的真空碳热还原条件下能够得到纳米碳化钛,随着碳含量的增加碳化钛的纯度提高,晶粒尺寸减小;随碳热还原温度从1 300℃升高到1 500℃,碳化钛的形貌由长径为100 nm左右的长条状变为粒径为20~30 nm的球形颗粒,但TiO相含量相对增加。
Titanium tetrabutoxide and sucrose were used as titanium source and carbon source respectively. The precursors were prepared by sol-gel method and in-situ carbothermal reduction under vacuum to prepare nano-titanium carbide. The phase and morphology of the product were analyzed by X-ray diffraction and scanning electron microscopy. The grain size of TiC was calculated according to the Scherrer formula. The results show that the nano-titanium carbide can be obtained under vacuum carbothermal reduction condition of 1 300 ℃. With the increase of carbon content, the purity of titanium carbide increases and the grain size decreases. With the increase of carbon reduction temperature from 1300 ℃ to 1 500 ℃, the morphology of titanium carbide changes from a long strip with a diameter of about 100 nm to a spherical particle with a particle size of 20 ~ 30 nm, but the content of TiO 2 increases relatively.