Self-propagating high-temperature synthesis of ZrO2 incorporated Gd2Ti2O7 pyrochlore

被引：0

作者：

Le PENG ^{[1
,2
]}

Kuibao ZHANG ^{[1
]}

Zongsheng HE ^{[1
]}

Dan YIN ^{[1
]}

Jiali XUE ^{[1
]}

Chen XU ^{[2
]}

Haibin ZHANG ^{[3
]}

机构：

[1] State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials, Southwest University of Science and Technology

[2] Science and Technology on Surface Physics and Chemistry Laboratory, China Academy of Engineering Physics

[3] Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics

来源：

Journal of Advanced Ceramics | 2018年 / 7卷 / 01期

基金：

中国国家自然科学基金;

关键词：

self-propagating high-temperature synthesis plus quick pressing (SHS/QP); pyrochlore; thermal transmission; waste form; aqueous leachability;

D O I：

暂无

中图分类号：

TQ174.1 [基础理论];

学科分类号：

摘要：

In this research, Zr-doped Gd2Ti2O7pyrochlores, with the composition of Gd2(Ti1-xZrx)2O7, were firstly synthesized by self-propagating high-temperature synthesis plus quick pressing(SHS/QP) using CuO as the oxidant and Ti as the reductant. To improve the radiation resistance of titanate–pyrochlore, up to 35 at% Zr was incorporated to substitute the Ti site of Gd2Ti2O7pyrochlore(Gd2(Ti0.75Zr0.35)2O7). XRD and SEM microstructural characterizations showed the formation of a composite ceramic with the major pyrochlore phase and the minor Cu phase. The generated temperature of samples decreased from 1702to 1011 ℃ with increasing Zr content. The effects of sintering temperature and pressure time on phase composition and microstructure were systematically studied. Besides, the influence of thermal transmission on the whole combustion process was also explored. The pyrochlore-based waste form possessed high bulk density of 6.25 g/cm3and Vickers hardness of 10.81 GPa. The MCC-1 leaching test showed the normalized elemental leaching rates(42d) of Cu, Gd, and Zr are 1.27×10-2, 1.33×10-3, and 8.44×10-7g·m-2·d-1, respectively.

引用

页码：41 / 49

页数：9

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