Coated ZrN sphere-UO2 composites as surrogates for UN-UO2 accident tolerant fuels
Coated ZrN sphere-UO2 composites as surrogates for UN-UO2 accident tolerant fuels
复制标题
DOI：
10.1016/j.jnucmat.2022.153845
复制
发表时间：
2022-08
影响因子：
3.1
通讯作者：
D. R. Costa;M. Hedberg;D. A. Lopes;M. Delmas;S. Middleburgh;J. Wallenius;P. Olsson
中科院分区：
文献类型：
--
作者：
D. R. Costa;M. Hedberg;D. A. Lopes;M. Delmas;S. Middleburgh;J. Wallenius;P. Olsson
嵌入二氧化铀（UO2）基质中的氮化铀（UN）球被认为是一种创新的事故容忍燃料（ATF）。然而，UN与uo2的相互作用限制了该复合材料在轻水堆中的适用性。限制这种相互作用的一种可能性是用具有高熔点、高导热性和合理低中子横截面的扩散屏障将两种材料分开。最近对un -X- uo2体系（X = V, Nb, Ta, Cr, Mo， W）界面相互作用的密度泛函理论计算和实验结果表明，Mo和W是很有前途的涂层候选者。在这项工作中，我们开发和研究了不同的涂层ZrN球的方法，作为UN球的替代材料：首先，使用Mo或W纳米粉末（湿和粘合剂）；其次，采用化学气相沉积（CVD）方法制备了含有15 wt%包覆ZrN球的ZrN- uo2复合材料，并通过火花等离子烧结（1773 K, 80 MPa）对其进行了固结，并用SEM/FIB-EDS和EBSD对其进行了表征。结果表明：Mo和W层致密，不与UO2相互作用。湿法Mo和粘结法Mo的镀层分别约为20µm和65µm，而粘结法Mo和CVD法W的镀层分别约为12µm和3µm。
Uranium nitride (UN) spheres embedded in uranium dioxide (UO2) matrix is considered an innovative accident tolerant fuel (ATF). However, the interaction between UN and UO2restricts the applicability of such composite in light water reactors. A possibility to limit this interaction is to separate the two materials with a diffusion barrier that has a high melting point, high thermal conductivity, and reasonably low neutron cross-section. Recent density functional theory calculations and experimental results on interface interactions in UN-X-UO2systems (X = V, Nb, Ta, Cr, Mo, W) concluded that Mo and W are promising coating candidates. In this work, we develop and study different methods of coating ZrN spheres, used as a surrogate material for UN spheres: first, using Mo or W nanopowders (wet and binder); and second, using chemical vapour deposition (CVD) of W. ZrN-UO2composites containing 15 wt% of coated ZrN spheres were consolidated by spark plasma sintering (1773 K, 80 MPa) and characterised by SEM/FIB-EDS and EBSD. The results show dense Mo and W layers without interaction with UO2. Wet and binder Mo methods provided coating layers of about 20 µm and 65 µm, respectively, while the binder and CVD of W methods layers of about 12 µm and 3 µm, respectively.