【摘要】 以水合碳酸铈为原料,以氯化钠作为助磨剂和阻聚剂,采用机械活化法制备了球形纳米氧化铈,用XRD法研究了水合碳酸铈与氯化钠质量比、球磨时间、煅烧温度对CeO2粉体晶粒度的影响,用TEM对最终产物粒子进行形貌观察。结果表明:在碳酸铈的球磨过程及其随后的煅烧过程中,氯化钠的存在起到了很好的助磨和阻聚作用,所得CeO2为类球形粒子,分散性较好,晶粒度约为30～50nm。更多还原

【Abstract】 A novel method for preparation of nano-size spherical ceria by milling hydrated cerium carbonate with sodium chloride as grind aid agent and agglomeration inhibitor was investigated. The effects of mass ratio of hydrated cerium carbonate to sodium chloride, milling time, calcination temperature on CeO₂ crystallite size were investigated by means of XRD. TEM micrograph of final product shows that CeO₂ powder obtained is spherically-shaped particle with crystallite size in the range of 30～50 nm. The results show that the co-existing sodium chloride in as-milled powders takes an important role for the formation of spherical ceria nanoparticle. And its grind-aiding and agglomeration-inhibiting action during milling and subsequent calcing period were discussed.更多还原