铋含量对铅铋合金表面张力的影响分析  

Influence of Bismuth Content on Surface Tension of Lead-bismuth Alloy

作　　者：王龙[1,2] 徐敬尧[2] 徐刚[2] 刘少军[2] 黄群英[2] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]中国科学院核能安全技术研究所,安徽合肥230031

出　　处：《原子能科学技术》2013年第B12期420-425,共6页Atomic Energy Science and Technology

基　　金：中国科学院知识创新工程重要方向项目资助(095CF2R211);中国科学院"未来先进核裂变能--ADS嬗变系统"先导专项资助项目(XDA03040200)

摘　　要：液态铅铋合金是加速器驱动的次临界系统(ADS)中散裂靶兼冷却剂的主要候选材料。表面张力是液态铅铋合金的重要热物性参数之一,而温度和化学组成是影响表面张力的关键因素。本文采用静滴法测量了5种不同成分铅铋合金的表面张力。实验结果显示:在测试温度范围内,铅铋合金的表面张力均随温度的升高先增大后减小,且在低温区表面张力非常小;相同温度下,铅铋合金的表面张力随Bi含量的增大逐渐降低,其中Bi的表面偏聚是导致其变小的重要因素之一。本研究结果为铅铋合金的成分优化提供了基本参考,对发展ADS散裂靶和冷却剂材料具有重要意义。Liquid lead-bismuth alloy has been considered as the potential candidates for the liquid spallation targets and the coolant of accelerator driven sub-critical system （ADS）. Surface tension is one of the important thermal and physical properties parameters of lead-bismuth alloy, and temperature and chemical composition are important influence factors of surface tension. In this paper, the surface tension of liquid lead-bismuth alloy was measured by sessile drop （SD） method. The results indicate that the surface tension of lead-bismuth alloy firstly increases and then decreases with the increase of the test temperature, and the surface tension for low test temperature is significantly small. At the same temperature, the surface tension of lead- bismuth alloy decreases with the increase of bismuth content, and segregation of bismuth onto the surface of molten lead-bismuth alloy is a key factor leading to the smaller surface tension. The results of this study provide basic reference for composition optimization of lead-bismuth alloy, which is of great significance for the development of spallation targets and the coolant materials of accelerated driven sub-critical system.

关 键 词：加速器驱动的次临界系统 静滴法 铅铋合金 表面张力 

分 类 号：TL34[核科学技术—核技术及应用]