Effect of Cl- on the properties of Li2TiO3 ceramic powders synthesized by in-situ hydrolysis
Effect of Cl- on the properties of Li2TiO3 ceramic powders synthesized by in-situ hydrolysis
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Cl-对原位水解合成Li2TiO3陶瓷粉体性能的影响
DOI：
10.1016/j.ceramint.2013.12.060
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发表时间：
2014-06-01
影响因子：
5.2
通讯作者：
Ye, Wanqi
中科院分区：
文献类型：
--
作者：
Xu, Cang;Li, Yunjiao;Ye, Wanqi
以TiCl4和LiOH中心点H2O为原料，采用原位水解法和水洗工艺得到Li2TiO3粉末。研究了水洗工艺去除所制备的Li2TiO3样品中可溶性氯化物盐以及Cl-对Li2TiO3粉末形貌和烧结行为的影响。结果表明，经过热处理的Li2TiO3粉末通过水洗可以很容易地去除90%以上的Cl-。水洗后的样品呈立方体状，粒径分布均匀，而原始粉末团聚在一起，形貌不规则。与原始未清洗的Li2TiO3粉末相比，清洗后的样品表现出更好的烧结性。烧结Li2TiO3颗粒的密度和热收缩率随着样品中Cl-含量的减少而增加。水洗后的Li2TiO3粉末的相对密度为90.9% T.D.（基于Li2TiO3单晶密度3.43 g/cm(3)的理论密度），热收缩率为13.1%，而未水洗样品的烧结体的T.D.和热收缩率分别仅为72.7%和10.3%。结果表明，Cl-对Li2TiO3样品的性能有显着影响，包括纯度、形貌和烧结行为。从原位水解获得的 Li2TiO3 样品中去除 Cl- 对于生产高质量的 Li2TiO3 颗粒是必要的。 (C) 2013 Elsevier Ltd 和 Techna Group S.r.l.版权所有。
Li2TiO3 powders were obtained by in-situ hydrolysis route along with water washing process, in which TiCl4 and LiOH center dot H2O were used as raw materials. The removal of soluble chloride salt in the as-prepared Li2TiO3 samples by water-washing process and the effect of Cl- upon the morphology and the sintering behavior of the Li2TiO3 powders have been studied. The results indicated that more than 90% of Cl- can be easily removed from the heat treated Li2TiO3 powders by water-washing. The samples after water-washing are in cube-like shape with uniform particle size distribution, while the original powders are cohered together with irregular morphology. Compared with the originally unwashed Li2TiO3 powders, the washed samples show better sinterability. The density and thermal shrinkage rate of the sintered Li2TiO3 pellets increase with a decrease of the Cl- content in the sample. Sintered body with the relative density of 90.9% T.D. (theoretical density based on the Li2TiO3 single crystal density of 3.43 g/cm(3)) and the thermal shrinkage rate of 13.1% was obtained from the water washed Li2TiO3 powders, whereas the T.D. and the thermal shrinkage rate were only 72.7% and 10.3% in the sintered body of unwashed sample, respectively. The results illustrated that Cl- had a significant effect on the properties of the Li2TiO3 samples, including purity, morphology and sintering behavior. The removal of Cl- from the Li2TiO3 samples obtained by in-situ hydrolysis is necessary for producing high-quality Li2TiO3 pellets. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.