Carbothermic reduction synthesis of Ti(C, N) powder in the presence of molten salt

详细信息    查看全文

• 作者：Xilai Chen ; Yuanbing Li ; Yawei Li ; Jiong Zhu ; Shengli Jin ; Lei Zhao ; Zhongxing Lei ; Xueqin Hong
• 关键词：Ti(C ; N) ; Molten salt ; Carbothermic reduction
• 刊名：Ceramics International
• 出版年：2008
• 出版时间：July 2008
• 年：2008
• 卷：34
• 期：5
• 页码：1253-1259
• 全文大小：823 K

文摘

In the presence of sodium chloride (NaCl), Ti(C, N) powder was successfully obtained by the carbothermal reduction of TiO₂ in lab-scale experiments. The effects of NaCl addition and reaction temperature on the formation of the powder were studied in the temperature range of 1100–1600 °C, the reaction time used in all cases was 3 h. The final powder was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). The results indicated that addition of NaCl played a facilitating role in the formation process of Ti(C, N). Ti(C, N) was detected at 1100–1200 °C, and the yield of powder was purer at about 1300 °C when 10 wt. % NaCl was added. The as-prepared Ti(C, N) was uniform in shape and the particle size was about 5–8 μm. With increasing temperature, the residual carbon content in the products decreased but the degree of oxidation increased at temperatures above 1300 °C. The possible mechanism involved in the reactions was discussed.