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Potential inert matrix materials: Materials synthesis and evaluation of in-service engineering parameters.

机译：潜在的惰性基体材料：材料合成和在役工程参数的评估。

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摘要

Containing no fertile materials, inert matrix fuel (IMF) has been introduced as a potential transmutation solution for the increasing inventory of both weapon grade and reactor grade plutonium (Pu). In the present work, the MgO-pyrochlore (Nd2Zr2O7) composites and spinel magnesium stannate (Mg2SnO4) were selected as potential inert matrix (IM) materials. A comprehensive investigation was conducted on evaluation of the engineering parameters of the potential IM materials.;The MgO-Nd2Zr2O7 composites and Mg 2SnO4 were fabricated through conventional solid state processing. The crystal structure and microstructure of the synthesized composites and Mg2SnO4 were studied. The irradiation tolerance of the potential IM materials was first assessed. The resistance of Mg2SnO 4 against irradiation induced amorphization was assessed experimentally using in situ TEM technique. The critical amorphization doses for Mg2SnO4 irradiated by 1 MeV Kr2+ ions were determined to be 5.5 dpa at 50 K and 11.0 dpa at 150 K, respectively. The obtained results were compared with other spinels especially MgAl 2O4, and the radiation tolerance of spinels were discussed.;The next evaluation was water corrosion resistance of the potential IM materials. Homogeneous MgO-Nd2Zr2O7 composites exhibited an improved hydrothermal corrosion resistance than inhomogeneous composites and pure MgO. Even though spinel Mg2SnO4 was not stable in water at 300°C and saturation pressure, the corrosion was limited only to the surface, and the volume and mass changes were less than 1 % after 720 h corrosion.;Feasibility of aqueous reprocessing was evaluated by studying the dissolution behavior of the potential IM materials in acidic solutions, with an emphasis on nitric acid. Dissolution of the MgO-Nd2Zr2O 7 composites in HNO3 resulted in a selective dissolution of MgO. Mechanical agitation such as magnetic bar stirring was necessary to achieve a completed dissolution of MgO and disintegration of porous Nd 2Zr2O7 matrix. It was demonstrated that Nd 2Zr2O7 could be successfully digested in boiling concentrated H2SO4. Similarly, dissolution of Mg 2SnO4 in HNO3 also resulted in a selective leaching of Mg2+ from the matrix. The undissolved substance consisted of SnO2 and substantial amorphous materials. Final evaluation will be performed by irradiating the potential IM materials in the Advanced Testing Reactor at Idaho National Lab.
机译：不含基质材料的惰性基质燃料（IMF）已被引入作为一种潜在的trans变解决方案，用于增加武器级和反应堆级p（Pu）的库存。在目前的工作中，MgO-烧绿石（Nd2Zr2O7）复合材料和尖晶石锡酸镁（Mg2SnO4）被选作潜在的惰性基质（IM）材料。对潜在的IM材料的工程参数进行了全面的研究。MgO-Nd2Zr2O7复合材料和Mg 2SnO4是通过常规固态工艺制备的。研究了合成的复合材料和Mg2SnO4的晶体结构和微观结构。首先评估潜在的IM材料的辐射耐受性。使用原位TEM技术，通过实验评估了Mg2SnO 4对辐射诱导的非晶化的抵抗力。 1 MeV Kr2 +离子辐照的Mg2SnO4的临界非晶化剂量分别确定为在50 K下为5.5 dpa和在150 K下为11.0 dpa。将所得结果与其他尖晶石，特别是MgAl 2O4进行比较，并讨论了尖晶石的辐射耐受性。;接下来的评估是潜在的IM材料的耐水腐蚀性能。均质MgO-Nd2Zr2O7复合材料比不均质复合材料和纯MgO表现出更高的耐水热腐蚀性能。即使尖晶石Mg2SnO4在300°C和饱和压力下在水中不稳定，腐蚀也仅局限于表面，并且在720 h腐蚀后体积和质量变化小于1％。研究潜在的IM材料在酸性溶液中的溶解行为，重点是硝酸。 MgO-Nd2Zr2O 7复合材料在HNO3中的溶解导致MgO的选择性溶解。为了实现MgO的完全溶解和多孔Nd 2Zr2O7基质的分解，必须进行机械搅拌，例如磁力棒搅拌。结果表明，Nd 2Zr2O7可以在沸腾的浓H2SO4中成功消化。同样，Mg 2SnO4在HNO3中的溶解也导致Mg2 +从基质中选择性浸出。不溶解的物质由SnO2和大量的无定形物质组成。最终评估将通过在爱达荷州国家实验室的高级测试反应堆中辐照潜在的IM材料来进行。

著录项

  • 作者

    Xu, Peng.;

  • 作者单位

    University of Florida.;

  • 授予单位 University of Florida.;
  • 学科 Engineering Nuclear.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 203 p.
  • 总页数 203
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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