Low-temperature reactive hot-pressing of cerium-doped titanate composite ceramics and their aqueous stability
Low-temperature reactive hot-pressing of cerium-doped titanate composite ceramics and their aqueous stability
复制标题
掺铈钛酸盐复合陶瓷的低温反应热压及其水稳定性
DOI：
10.1016/j.jeurceramsoc.2013.10.020
复制
发表时间：
2014-04-01
影响因子：
5.7
通讯作者：
Zhang, Kuibao
中科院分区：
文献类型：
--
作者：
Teng, Yuancheng;Wang, Shanlin;Zhang, Kuibao
反应热压技术在制备高放废物固化用钛酸盐陶瓷固化体中的应用较少。然而，与非反应性工艺相比，通过反应性热压在降低的温度下生产高密度陶瓷具有优势。在1150 ℃、30 MPa下反应热压1-4 h，制备了相对密度大于99%的Ce-IV掺杂钛酸盐复相陶瓷。结果表明，复合陶瓷的低温致密化可能归因于热压条件下的塑性变形。此外，使用标准MCC-1静态浸出测试方法进行水性稳定性测试。结果表明，21天后，Ca、Ce和Zr的标准化元素浸出率相当恒定，处于低于5 x 10（-2）gm（-2）d（-1）、1，7 x 10（-6）gm（-2）d（-1）和6 x 10（-6）gm（-2）d（-1）的较低值。(C)2013爱思唯尔有限公司保留所有权利。
Reactive hot-pressing was scarcely applied to fabricate titanate ceramic waste forms designed for immobilizing high-level radioactive waste (HLW). However, compared with non-reactive processes, there is an advantage of producing high-density ceramics at reduced temperatures by reactive hot-pressing. Ce-IV-doped titanate composite ceramics with relative densities in excess of 99% were prepared by reactive hot-pressing at temperature as low as 1150 degrees C and pressure of 30 MPa for 1-4 h. The results show that low-temperature densification of the composite ceramics might be attributed to the plastic deformation under hot-pressing condition. In addition, aqueous stability testing was carried out using the standard MCC-1 static leach test method. The results demonstrate that the normalized elemental leach rate of Ca, Ce and Zr were fairly constant in a low value below 5 x 10(-2) gm(-2) d(-1), 1, 7 x 10(-6) gm(-2) d(-1) and 6 x 10(-6) gm(-2) d(-1) after 21 d. (C) 2013 Elsevier Ltd. All rights reserved.