【摘要】 利用镁热、碳热还原钛铁矿,原位燃烧合成制备了超细 TiC 粉体。通过理论分析、实验研究分析了燃烧合成的规律及镁含量对产物特性的影响。结果表明,钛铁矿-镁-碳是一个强放热体系,体系开始反应的温度为 577.7 ℃,当钛铁矿与镁的摩尔比为 1:4 时,燃烧合成酸洗出的 TiC 微粉纯度最高,并显示了较窄的粒度分布,其平均粒度为 229.6 nm。更多还原

【Abstract】 Formation of ultrafine titanium carbide powder from FeTiO3 (ilmenite)-Mg-C by combustion synthesis was reported. The laws of combustion and the effect of magnesium concentration on the characteristics of the product were discussed thermodynamically and investigated experimentally. It is found that the system is an intensively exothermic reaction and the start reaction temperature of the FeTiO3 -Mg-C system is about 577.7℃. When the molar ratio of ilmenite to magnesium is 1:4, ultrafine TiC powder after leaching is reasonably pure and shows a narrow particle size distribution. The average particle size of the final powder is 229.6 nm.更多还原