Improving molten fluoride salt and Xe-135 barrier property of nuclear graphite by phenolic resin impregnation process
Improving molten fluoride salt and Xe-135 barrier property of nuclear graphite by phenolic resin impregnation process
复制标题
酚醛树脂浸渍工艺提高核石墨熔融氟化盐和Xe-135阻隔性能
DOI：
10.1016/j.jnucmat.2017.11.019
复制
发表时间：
2018
影响因子：
3.1
通讯作者：
Guo Quangui
中科院分区：
文献类型：
--
作者：
He Zhao;Lian Pengfei;Song Yan;Liu Zhanjun;Song Jinliang;Zhang Junpeng;Feng Jing;Yan Xi;Guo Quangui
在等静压石墨（IG-110，TOYO TANSO CO.，有限公司、日本）通过浸渍酚醛树脂得到了专门用于熔盐反应堆的具有近11 nm孔径的致密等静压石墨（D-IG-110）。系统地研究了致密化前后石墨的微观结构、力学性能、热物理性能等。分别在高压反应器和真空装置中研究了熔融氟化物盐和Xe 135在石墨中的渗透。结果表明，与IG-110相比，D-IG-110的孔隙率低（2.8%），平均孔径为11 nm，石墨表面的开孔更小，因此具有更好的耐熔盐渗透性和耐Xe 135渗透性。IG-110的氟盐渗透量在1.5大气压下为13.5重量%，在3大气压下趋于饱和，氟盐占有率为14.8重量%。至于D-IG-110，即使尝试加载高达10个大气压，也无法检测到盐。D-IG-110的氦扩散系数为6.92 × 10− 8 cm 2/s，明显低于IG-110的1.21 × 10− 2cm 2/s。如果浸渍的D-IG-110的这些生产性质可以在MSR操作期间保持，则该材料可以证明在抑制石墨中的熔融氟化物盐和Xe 135存量方面是有效的。
A densification process has been conducted on isostatic graphite (IG-110, TOYO TANSO CO., Ltd., Japan) by impregnating phenolic resin to get the densified isostatic graphite (D-IG-110) with pore diameter of nearly 11 nm specifically for molten salt reactor application. The microstructure, mechanical, thermophysical and other properties of graphite were systematically investigated and compared before and after the densification process. The molten fluoride salt and Xe135penetration in the graphite were evaluated in a high-pressure reactor and a vacuum device, respectively. Results indicated that D-IG-110 exhibited improved properties including infiltration resistance to molten fluoride salt and Xe135as compared to IG-110 due to its low porosity of 2.8%, the average pore diameter of 11 nm and even smaller open pores on the surface of the graphite. The fluoride salt infiltration amount of IG-110 was 13.5 wt% under 1.5 atm and tended to be saturated under 3 atm with the fluoride salt occupation of 14.8 wt%. As to the D-IG-110, no salts could be detected even up to 10 atm attempted loading. The helium diffusion coefficient of D-IG-110 was 6.92 × 10−8cm2/s, significantly less than 1.21 × 10−2cm2/s of IG-110. If these as-produced properties for impregnated D-IG-110 could be retained during MSR operation, the material could prove effective at inhibiting molten fluoride salt and Xe135inventories in the graphite.