回流法制备纳米碳化钛粉体

The refluxing preparation of TiC nanopowders

两步回流无定形的H_2TiO_3与液态烷烃所形成的悬浮液制备得到灰黑色的先驱体粉体;经拉曼光谱及元素分析表明在回流过程中烷烃脱氢后形成大量的焦炭沉积;利用烷烃回流脱氢所形成的焦炭为碳源,对该先驱体在静止氩气保护下进行热处理,分析表明在1300℃的温度条件下便可得到纳米TiC粉体;产物TiC粉体表现出较好的分散性,主要由纳米颗粒组成,平均粒径30 nm,同时,明显可以看到局部的颗粒表现出空心形貌。

Two-stage refluxing of the amorphous Hz TiO3 and liquid alkane suspension resulted in the formation of a black precursor powder. Raman spectra and element microanalysis of the precursor show alkane dehydrogenation and the formation of coke during long time refluxing at some temperature. The coke was used as carbon source. Annealing treatment of the precursor powder at 1300°C under static argon yielded metallic, gray TiC powders. The as-prepared nanopowders show good dispersion, partial hollow shape and are mainly composed of TiC nanoparticles with a mean diameter of 30 nm.