Effects of FLiNaK infiltration on thermal expansion behavior of graphite

被引：13

作者：

Qi, Wei ^{[1
,2
]}

He, Zhoutong ^{[1
]}

Tang, Hui ^{[1
]}

Zhang, Baoliang ^{[3
]}

Zhang, Can ^{[1
]}

Gao, Lina ^{[1
]}

Song, Jinliang ^{[1
]}

Zhang, Dongsheng ^{[1
]}

Wang, Xue ^{[1
]}

Du, Xianlong ^{[1
]}

Lei, Guanhong ^{[1
]}

Xia, Huihao ^{[1
]}

Wang, Jianqiang ^{[1
]}

Huai, Ping ^{[1
]}

Zhou, Xingtai ^{[1
]}

机构：

[1] Chinese Acad Sci, Key Lab Nucl Radiat & Nucl Energy Technol, Shanghai 201800, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Tsinghua Univ, Collaborat Innovat Ctr Adv Nucl Energy Technol, Key Lab Adv Reactor Engn & Safety, Inst Nucl & New Energy Technol,Minist Educ, Beijing 100084, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE | 2017年 / 52卷 / 08期

基金：

中国国家自然科学基金;

关键词：

NUCLEAR GRAPHITE; MECHANICAL-PROPERTIES; SALT INFILTRATION; POROUS MATERIALS; GAS-PRESSURE; MOLTEN LICL; COMPOSITES; CARBON; CRYSTALLIZATION; COEFFICIENT;

D O I：

10.1007/s10853-016-0706-x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The changes in both the crystallographic coefficient of thermal expansion (CCTE) and the coefficient of thermal expansion (CTE) of FLiNaK-infiltrated nuclear graphite were studied using in situ-heating X-ray diffraction analysis and horizontal push-rod dilatometry. It was found that, at temperatures lower than the melting point of FLiNaK, the CCTE of the d(002) spacing of graphite decreases with an increase in the weight of the graphite sample because of FLiNaK infiltration. On the other hand, the CTE of bulk graphite increases after molten salt infiltration. The CCTEs of the as-prepared FLiNaK salt, and the salt in the graphite pores were compared. The decrease in the CCTE of the FLiNaK salt after it had infiltrated into the graphite pores confirmed that interactions occur between the graphite and the salt. These interactions are probably induced by the difference in the CTEs of graphite and the solidified salt. Further, it is likely that the crystallization pressure also plays an important role here. Thus, both the causes need to be considered when using nuclear graphite in molten salt reactors.

引用

页码：4621 / 4634

页数：14

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