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首页> 美国卫生研究院文献>Materials >Different Radiation Tolerances of Ultrafine-Grained Zirconia–Magnesia Composite Ceramics with Different Grain Sizes
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Different Radiation Tolerances of Ultrafine-Grained Zirconia–Magnesia Composite Ceramics with Different Grain Sizes

机译：不同晶粒度的超细晶粒氧化锆-氧化镁复合陶瓷的不同耐辐射性

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摘要

Developing high-radiation-tolerant inert matrix fuel (IMF) with a long lifetime is important for advanced fission nuclear systems. In this work, we combined zirconia (ZrO2) with magnesia (MgO) to form ultrafine-grained ZrO2–MgO composite ceramics. On the one hand, the formation of phase interfaces can stabilize the structure of ZrO2 as well as inhibiting excessive coarsening of grains. On the other hand, the grain refinement of the composite ceramics can increase the defect sinks. Two kinds of composite ceramics with different grain sizes were prepared by spark plasma sintering (SPS), and their radiation damage behaviors were evaluated by helium (He) and xenon (Xe) ion irradiation. It was found that these dual-phase composite ceramics had better radiation tolerance than the pure yttria-stabilized ZrO2 (YSZ) and MgO. Regarding He+ ion irradiation with low displacement damage, the ZrO2–MgO composite ceramic with smaller grain size had a better ability to manage He bubbles than the composite ceramic with larger grain size. However, the ZrO2–MgO composite ceramic with a larger grain size could withstand higher displacement damage in the phase transformation under heavy ion irradiation. Therefore, the balance in managing He bubbles and phase stability should be considered in choosing suitable grain sizes.
机译：开发具有长寿命的耐高辐射惰性基质燃料（IMF）对于先进的裂变核系统很重要。在这项工作中，我们将氧化锆（ZrO2）与氧化镁（MgO）结合在一起以形成ZrO2–MgO超细晶粒复合陶瓷。一方面，相界面的形成可以稳定ZrO2的结构，并抑制晶粒的过度粗化。另一方面，复合陶瓷的晶粒细化会增加缺陷沉。通过火花等离子体烧结（SPS）制备了两种不同粒径的复合陶瓷，并通过氦（He）和氙（Xe）离子辐照评价了它们的辐射损伤行为。发现这些双相复合陶瓷比纯氧化钇稳定的ZrO2（YSZ）和MgO具有更好的辐射耐受性。对于低位移损伤的He + 离子辐照，具有较小晶粒尺寸的ZrO2-MgO复合陶瓷具有比具有较大晶粒尺寸的复合陶瓷更好的处理He气泡的能力。然而，具有较大晶粒尺寸的ZrO2-MgO复合陶瓷在重离子辐照下的相变中可以承受更高的位移损伤。因此，在选择合适的晶粒尺寸时，应考虑到在管理He气泡和相稳定性方面的平衡。

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