摘要
基于中国铅基研究堆CLEAR-Ⅰ高温运行环境,研究了过滤材料烧结316L纤维毡在氧浓度1×10^(-6) wt%、温度500℃、静态铅铋合金(lead bismuth eutectic,LBE)中腐蚀不同时间后拉伸性能的变化规律.结果表明,在腐蚀500h、1000h、1500h后,纤维毡的抗拉强度分别下降至原始纤维毡的67%、33%和15%,其主要原因是在本实验条件下,LBE腐蚀导致烧结结点结合强度的下降和纤维丝丝径的减小.微观结构分析表明,316L纤维丝表面形成一层不断增厚的致密(Fe,Cr)_3O_4尖晶石氧化膜,该氧化膜形成与生长降低了纤维丝之间结点的结合强度,同时减小了纤维丝的有效丝径,进而导致纤维毡整体抗拉强度的下降.
Based on the operation environment of China Lead-based Research Reactor（CLEAR-I）,the tensile properties of filter material-sintered 316 Lfiber felt exposed to stagnant lead bismuth eutectic（LBE）with 1×10（-6） wt% oxygen concentration was investigated at 500℃for 500 h,1000h,1500 h.The results showed that compared to the original fiber felt,the tensile strength of the fiber felts decreased to67%,33% and 15% after 500 h,1000hand 1500 h,respectively.It was found that the binding strength of the joints and diameter of 316 Lstainless steel fibers gradually decreased with exposure time due to the compact single-layer（Fe,Cr）3O4spinel formation on 316 Lfibers,which was the main cause of tensilestrength of sintered 316 Lfiber felt dropping after LBE corrosion.
基金
中国科学院战略性先导科技专项(XDA03040000)
国家自然科学基金(11605229)资助
关键词
铅铋合金
烧结316L纤维毡
腐蚀
抗拉强度
lead bismuth eutectic
sintered 316Lfiber felt
corrosion
tensile strength
