Steam-chemical reactivity for irradiated beryllium
Steam-chemical reactivity for irradiated beryllium
复制标题
辐照铍的蒸汽化学反应性
DOI：
10.1016/s0022-3115(98)00255-4
复制
发表时间：
1998
影响因子：
3.1
通讯作者：
G. Smolik
中科院分区：
文献类型：
--
作者：
R. Anderl;K. Mccarthy;M. A. Oates;D. Petti;R. Pawelko;G. Smolik
本文报道了中子辐照效应和退火对铍在水蒸气中化学反应性影响的实验结果。这项工作包括：（1）在700°C至1200°C的温度范围内退火的辐照Be的溶胀、孔隙率和比表面积的测量，以及（2）在升高的温度下暴露于蒸汽的未辐照Be、辐照Be和辐照退火Be的氢生成速率的测量。对于辐照的Be，体积膨胀从700°C退火时的14%增加到1200°C退火时的约56%。在退火过程中的气体释放测量表明的表面连接的孔隙网络的发展。辐照退火铍的比表面积随退火温度的升高而增大。在450°C和600°C之间的温度下，辐照和未辐照Be的蒸汽化学反应性相似。对于暴露于700°C蒸汽的辐照Be，反应性迅速加速并且试样经历温度偏移。辐照退火的Be表现出增强的化学反应性与其更高的比表面积。
This paper reports experimental results concerning the influence of neutron irradiation effects and annealing on the chemical reactivity of beryllium exposed to steam. The work entailed: (1) measurements of swelling, porosity and specific surface area for irradiated Be annealed at temperatures ranging from 700°C to 1200°C and (2) measurements of hydrogen generation rates for unirradiated Be, irradiated Be and irradiated-annealed Be exposed to steam at elevated temperatures. For irradiated Be, volumetric swelling increased from 14% at a 700°C anneal to about 56% at a 1200°C anneal. Gas-release measurements during annealing indicated the development of a surface-connected porosity network. Specific surface areas for irradiated-annealed Be increased with the anneal temperature. Steam-chemical reactivity was similar for irradiated and unirradiated Be at temperatures between 450°C and 600°C. For irradiated Be exposed to steam at 700°C, the reactivity accelerated rapidly and the specimen experienced a temperature excursion. Irradiated-annealed Be showed enhanced chemical reactivity related to its higher specific surface area.