Self-propagating chemical furnace synthesis of nanograin Gd2Zr2O7 ceramic and its aqueous durability
Self-propagating chemical furnace synthesis of nanograin Gd2Zr2O7 ceramic and its aqueous durability
复制标题
自蔓延化学炉合成纳米晶Gd2Zr2O7陶瓷及其水耐久性
DOI：
10.1016/j.jnucmat.2018.10.035
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发表时间：
2018-12-15
影响因子：
3.1
通讯作者：
Zhang, Haibin
中科院分区：
文献类型：
--
作者：
He, Zongsheng;Zhang, Kuibao;Zhang, Haibin
Gd_2Zr_2O_7陶瓷是高放废物固化的理想载体。本文以纳米级的Gd 2 O3和ZrO 2为原料，采用自蔓延化学炉快速压制法（SCF/QP）快速合成了单颗粒Gd 2 Zr 2 O 7纳米陶瓷。结果表明，在超高升温速率下成功制备了平均晶粒尺寸为84 nm的Gd 2 Zr 2 O 7纳米晶陶瓷。Gd 2 Zr 2 O 7陶瓷具有较高的维氏硬度（11.4GPa）和体积密度（6.54g/cm 3）。还评价了水性耐久性。Gd_2Zr_2O_7样品在42天的浸出后的LRGd和LRzr值低至5.4 × 10 ~（-6）和8.2 × 10 ~（-7）g·m ~（-2）·d ~（-1）。(C)2018爱思唯尔B. V.保留所有权利。
Gd2Zr2O7 ceramic is recognized as an ideal matrice for the immobilization of high-level radioactive waste. In this report, the single Gd2Zr2O7 nanograin ceramic was rapidly synthesized by self-propagating chemical furnace synthesis plus quick pressing (SCF/QP) using Gd2O3 and ZrO2 with nano-scale particle size as the raw materials. The results demonstrate Gd2Zr2O7 nanograin ceramic with an average grain size of 84 nm was successfully obtained under the ultra-high heating rate. The Gd2Zr2O7 ceramic shows reasonable high Vickers hardness of 11.4 GPa and bulk density of 6.54 g/cm 3 . The aqueous durability was also evaluated. The LRGd and LRzr, values of Gd2Zr2O7 sample were as low as 5.4 x 10(-6) and 8.2 x 10(-7) g m(-2) d(-1) after 42 days leaching. (C) 2018 Elsevier B.V. All rights reserved.