论文部分内容阅读
以二氧化钛、硼酸和不同碳源(炭黑、蔗糖、葡萄糖)为原料,用碳热还原法合成了TiC–TiB_2复合粉末。研究了不同种类碳源及反应温度对TiC–TiB_2复合粉末的影响。用X-射线衍射仪、激光粒度分析仪和扫描电子显微镜对样品的物相组成、晶粒尺寸及颗粒形貌进行了分析。结果表明:以炭黑、葡萄糖为碳源合成TiC–TiB_2复合粉末的适宜宜条件为在1400℃保温2h;以蔗糖为碳源合成TiC–TiB_2复合粉末的适宜条件为在1350℃保温2h。在最适宜反应温度下,以炭黑为碳源合成的TiC–TiB_2复合粉末样品粒径最小,且颗粒之间相互团聚较少,大部分颗粒尺寸在100nm左右。
Titanium dioxide, boric acid and different carbon sources (carbon black, sucrose, glucose) as raw materials, carbothermal synthesis TiC-TiB_2 composite powder. The effects of different carbon sources and reaction temperature on TiC-TiB 2 composite powders were studied. The phase composition, grain size and particle morphology of the samples were analyzed by X-ray diffraction, laser particle size analyzer and scanning electron microscopy. The results showed that suitable conditions for synthesizing TiC-TiB_2 composite powder with carbon black and glucose as carbon source were as follows: keeping the temperature at 1400 ℃ for 2h; suitable conditions for synthesizing TiC-TiB_2 composite powder with sucrose as carbon source were keeping temperature at 1350 ℃ for 2h. Under optimum reaction temperature, the particle size of TiC-TiB_2 composite powder synthesized with carbon black is the smallest, and the particles are less agglomerated with each other. Most of the particles are about 100 nm in size.