Thermal conductivity and acid dissolution behavior of MgO-ZrO2 ceramics for use in LWR inert matrix fuel
Thermal conductivity and acid dissolution behavior of MgO-ZrO2 ceramics for use in LWR inert matrix fuel
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DOI：
10.1016/j.jnucmat.2005.10.009
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发表时间：
2006-02-15
影响因子：
3.1
通讯作者：
Meyer, MK
中科院分区：
文献类型：
--
作者：
Medvedev, PG;Lambregts, MJ;Meyer, MK
提出了在现有轻水反应堆中使用双相氧化镁-氧化锆陶瓷作为惰性基质燃料，以处理钚和少量氡系元素。开发这种复合材料的概念是为了利用该复合材料成分的已知优势：氧化镁的高导热系数，以及二氧化锆在轻水反应堆冷却剂中的稳定性。本文研究了MgO-ZrO2陶瓷的导热系数和硝酸溶解性。基于实验和分析技术的热分析证实，所有研究成分的产物具有比UO2更好的导热系数。硝酸溶解实验表明，只有游离的MgO相溶解在硝酸中，留下了由ZrO2基固溶体组成的多孔球。爱思唯尔出版公司(Elsevier B.V.)
Dual-phase MgO-ZrO2 ceramics are proposed for use in inert matrix fuel for disposition of plutonium and minor actinides in existing light water reactors. The concept for use of this composite material was developed with the intent to capitalize on the known advantages of the composite's constituents: high thermal conductivity of MgO, and stability of ZrO2 in LWR coolant. The study presented in this paper addressed the thermal conductivity and nitric acid solubility of MgO-ZrO2 ceramics. Thermal analysis, based on experimental and analytical techniques, established that the product of all investigated compositions has the thermal conductivity superior to that of UO2. Nitric acid dissolution experiments showed that only the free MgO phase dissolves in the nitric acid, leaving behind a porous pellet consisting of a ZrO2-based solid solution. Published by Elsevier B.V.