摘要
针对以碳酸镧铈为原料制备稀土抛光粉工艺,对工艺流程中的焙烧过程进行了研究,采用XRD、扫描电子显微镜和透射电子显微镜等分析手段对焙烧前驱体及焙烧产物进行分析对比。结果表明,铈基抛光粉的焙烧过程主要分为稀土碳酸盐的脱水过程、氟碳酸盐分解过程、稀土氟氧中间化合物的生成过程、稀土氧化物的最终转变生成过程;稀土抛光粉主要有两相构成,一相为CeO2晶格中固溶部分La3+,另一相为CeLa2O3F3,且在CeO2与CeLa2O3F3之间的界面没有形成很好的外延关系,而是存在一定的界面混合;焙烧过程中,主要依靠非均匀形核,形核后CeO2晶粒生长过程中,焙烧450 min,之前(111)面晶粒尺寸的生长速度要大于(200)晶面,450 min之后,整个晶粒形状基本呈球形。且随焙烧时间的增加,晶格常数和晶格畸变的变化趋势是逐渐减小并趋于稳定。
The roasting process of preparation of rare earth polishing powder was studied by using XRD, scanning electron microscope （SEM） and transmission electron microscopy （TEM）. The results show that the roasting process consists of four stage, the dehydration of rare earth carbonate fluorine carbonate decomposition, the formation of intermediate compound of rare earth oxygen - fluorine and the formation of rare earth oxides; Rare earth polishing powder is mainly composed of two phases, solid solution phase of La3 ~ in CeO2 lattice and phase of CeLa2 03 F3, and the two - phase interface is not clear. Het- erogeneous nuclestion mainly occurred in rosting process. Crystal growth in （ 111 ） planes was faster than that in （200） planes when roasting time was less than 450 minutes. When roasting for longer than 450 minutes, the crystal grains exhibited approximate spherical shape. With increase of roasting time, the lattice constant and lattice distortion decreased.
出处
《稀土》
EI
CAS
CSCD
北大核心
2013年第5期11-15,共5页
Chinese Rare Earths
基金
国家863项目资助(2010AA03A407)
关键词
稀土
抛光粉
焙烧
组织结构
rare earth
polishing powder
roasting
structure
