研究 ZrO2/MgO 陶瓷相组成的变化对 Kr15+ 离子照射期间抗辐射损伤能力的影响

IF 3 Q2 MATERIALS SCIENCE, COMPOSITES
Alisher E. Kurakhmedov, A. Morzabayev, V. Uglov, A. Kozlovskiy
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引用次数: 0

摘要

对含锆陶瓷改性的兴趣源于它们作为制造分散核燃料惰性基质材料的巨大前景,这种材料可以取代传统的含二氧化铀的燃料,并提高其燃耗程度。此外,在提供的各种不同类型的陶瓷中,二氧化锆是最有前途的,因为它比其他类型的陶瓷具有更高的导热系数值,并且体积热膨胀小。此外,将这些类型的陶瓷用作制造惰性基质的材料的关键限制是多晶型转化,这对外部影响下陶瓷性能的变化有负面影响。给出了ZrO2陶瓷在能量与裂变碎片相当的重离子辐照下,相组成变化对其抗辐射损伤性能影响的评价结果。以掺杂MgO的ZrO2陶瓷样品为研究对象,MgO浓度的变化导致热烧结过程中多晶转变过程加速,并形成含有MgO晶粒形式的ZrO2/MgO型结构。变形夹杂堆积对陶瓷晶体结构稳定性的影响结果表明,单斜晶型陶瓷的稳定性最差,在高辐照影响下,变形变形的堆积导致m-ZrO2→t-ZrO2型的多晶转变。在评价辐照对力学性能变化和软化程度的影响时,发现m-ZrO2→t-ZrO2和t-ZrO2→c-ZrO2的相变导致抗裂性能提高1.5 ~ 2.0倍。同时,在界面空间形成了以MgO颗粒形式包裹的ZrO2/MgO型结构,软化阻力增长了7倍以上。在确定热物理参数以及在长时间热暴露期间保持晶体结构热膨胀稳定性的测试中,发现与t-ZrO2→c-ZrO2型多晶转化相关的相变导致热物理性质的稳定性保持,即使在高辐照影响的情况下也是如此。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of the Effect of Variation in the Phase Composition of ZrO2/MgO Ceramics on the Resistance to Radiation Damage during Irradiation with Kr15+ Ions
Interest in the modification of zirconium-containing ceramics is rooted in their great prospects for application as materials for creating inert matrices of dispersed nuclear fuel, which can replace traditional fuel containing uranium dioxide, as well as increase the degree of its burnup. Moreover, among the variety of different types of ceramics offered, zirconium dioxide is the most promising, since it has higher thermal conductivity values compared to other types of ceramics, as well as low volumetric thermal expansion. Moreover, the key limitations in the application of these types of ceramics as materials for creating inert matrices are polymorphic transformations, which have a negative impact on changes in the properties of ceramics under external influences. The evaluation results of the impact of change in the ZrO2 ceramics’ phase composition on the radiation damage resistance when subjected to irradiation with heavy ions, comparable in energy to fission fragments, are presented. The objects of study were samples of ZrO2 ceramics doped with MgO, the variation in the concentration of which leads to an acceleration of the processes of polymorphic transformations during thermal sintering, as well as the formation of a ZrO2/MgO-type structure with inclusions in the form of MgO grains. The results of the irradiation effect on the stability of the crystal structure of ceramics to deformation swelling due to the accumulation of deformation inclusions showed that ceramics with a monoclinic structure type are the least stable, for which, in the case of high irradiation fluences, the accumulation of deformation distortions leads to polymorphic transformations of the m—ZrO2 → t—ZrO2 type. During the evaluation of the irradiation effect on the change in mechanical properties and the softening degree, it was found that phase transformations of the m—ZrO2 → t—ZrO2 and t—ZrO2 → c—ZrO2 types lead to an increase in crack resistance by 1.5–2.0 times. Meanwhile, the formation of a structure of the ZrO2/MgO type with inclusions in the form of MgO grains in the interboundary space results in a softening resistance growth by over 7-fold. During tests for determining thermophysical parameters, as well as maintaining stability to crystal structure thermal expansion during prolonged thermal exposure, it was found that phase transformations associated with polymorphic transformations of the t—ZrO2 → c—ZrO2 type led to the preservation of the stability of thermophysical properties, even in the case of high irradiation fluences.
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来源期刊
Journal of Composites Science
Journal of Composites Science MATERIALS SCIENCE, COMPOSITES-
CiteScore
5.00
自引率
9.10%
发文量
328
审稿时长
11 weeks
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