Abstract ZrO 2 is one of the candidate materials for the matrix of inert matrix fuels because of its excellent chemical stability and irradiation resistance. In this paper, the low thermal conductivity of ZrO 2 was increased by the addition of Mo reinforcements in order to improve its performance and therefore increase the safety of nuclear reactors. The effect of interfacial thermal resistance and reinforcement structure in terms of its size, shape, and orientation on the thermal conductivity of Mo powder- and Mo wire mesh-reinforced ZrO 2 composites fabricated by spark plasma sintering at 1700°C in vacuum was investigated. It was found that structures with a higher degree of interconnectivity of the high thermal conductivity reinforcements were more effective in increasing the thermal conductivity of ZrO 2 composites. The Mo wire mesh-ZrO 2 composites had a higher thermal conductivity than did the Mo powder-ZrO 2 composites, owing to the interconnected structure of the former. The thermal conductivities of the Mo-ZrO 2 composites were also analyzed by the finite element analysis and using analytical models of the composites with the dispersed reinforcing particles and the interconnected reinforcement structures. A good agreement was found between the theoretically predicted and experimentally measured thermal conductivity of Mo-reinforced ZrO 2 composites.

中文翻译：

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惰性基体燃料放电等离子烧结钼增强ZrO 2 复合材料的热导率

摘要 ZrO 2 具有优异的化学稳定性和耐辐照性，是惰性基体燃料基体的候选材料之一。在本文中，ZrO 2 的低热导率通过添加 Mo 增强剂来提高，以提高其性能，从而提高核反应堆的安全性。研究了界面热阻和增强结构的尺寸、形状和取向对通过在 1700°C 真空下放电等离子烧结制备的钼粉和钼丝网增强 ZrO 2 复合材料的热导率的影响。结果表明，高导热增强材料的互连程度越高，其在提高 ZrO 2 复合材料的导热率方面越有效。由于Mo丝网-ZrO 2 复合材料的互连结构，Mo丝网-ZrO 2 复合材料具有比Mo粉-ZrO 2 复合材料更高的热导率。Mo-ZrO 2 复合材料的热导率也通过有限元分析和使用具有分散增强颗粒和互连增强结构的复合材料的分析模型进行分析。在 Mo 增强的 ZrO 2 复合材料的理论预测和实验测量的热导率之间发现了良好的一致性。Mo-ZrO 2 复合材料的热导率也通过有限元分析和使用具有分散增强颗粒和互连增强结构的复合材料的分析模型进行分析。在 Mo 增强的 ZrO 2 复合材料的理论预测和实验测量的热导率之间发现了良好的一致性。Mo-ZrO 2 复合材料的热导率也通过有限元分析和使用具有分散增强颗粒和互连增强结构的复合材料的分析模型进行分析。在 Mo 增强的 ZrO 2 复合材料的理论预测和实验测量的热导率之间发现了良好的一致性。