TiB_2陶瓷粉料的合成与纯化

Synthesis and Purification of TiB_2 Power

采用自蔓延高温还原合成法,以化学纯B2O3,TiO2和金属镁粉为原料,制备了TiB2陶瓷粉料.研究B2O3-TiO2-Mg合成系统在加热过程中的物理化学变化规律及TiB2陶瓷粉料的化学清洗提纯过程.结果表明:B2O3-TiO2-Mg体系在加热过程中合成反应分两步完成,首先是Mg从B2O3和TiO2中还原出单体元素Ti和B,然后是单体元素Ti和B发生合成反应生成TiB2;粉料的化学清洗提纯最佳条件是用2.0 mol/L盐酸过量40%,加热至60℃左右清洗1.5h,可得到几乎纯净的TiB2陶瓷粉料.

TiB2 power is fabricated by self-propagating high-temperature synthesis with B203, TiO2 and Mg power as raw materials. In this work, we investigate the chemicophysics reactions in the course of heat-treatment and analyzed the washing process of the product. The results show that Mg element recovers Ti and B elements from B2O3 and TiO2 at first, and then Ti element reacts with B element into TiB2 ; The optimum condition to obtain pure TiB2 is to wash the product in 2.0 mol/L at 60℃ for about 1.5h with 40% hydrochloric acid overrunning.