Preparation of ultrafine-grain graphite by liquid dispersion technique for inhibiting the liquid fluoride salt infiltration

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• 作者：Pengfei Lian^a ; Jinliang Song^b ; ^{jlsong1982@yeah.net" class="auth_mail" title="E-mail the corresponding author} ; Zhanjun Liu^a ; ^{zjliu03@sxicc.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Junpeng Zhang^a ; Yanling Zhao^c ; Yantao Gao^b ; Zechao Tao^a ; Zhoutong He^b ; Lina Gao^b ; Huihao Xia^b ; ; Quangui Guo^a ; Ping Huai^b ; Xingtai Zhou^b
• 刊名：Carbon
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：102
• 期：Complete
• 页码：208-215
• 全文大小：2568 K

文摘

In this work, the mixtures of coke aggregates and coal tar pitch were used as starting materials to prepare ultrafine-grain graphites (UGG) by a liquid mixing method for the inhibition of molten salts in molten salt reactor (MSR). The average diameters of coke aggregates for UGG-1 and UGG-2 were respectively 10 and 5 μm. The liquid dispersion technique could effectively prevent fine particles of raw materials from being conglomerated. Microstructure, thermophysical and other properties of the obtained graphite were studied. A high-pressure reactor was constructed to evaluate the molten salt penetration in the graphite. Compared to isostatic graphite (IG-110,TOYO TANSO CO., LTD.), UGG-2 possessed excellent properties such as high bending strength of 81.0 ± 2.5 MPa, compressive strength of 133 ± 3 MPa, low porosity of 14.0 ± 0.1% and an average pore diameter of 0.52 ± 0.01 μm. The fluoride salt volume occupation of IG-110 and UGG-1 under 1.5 atm was 14.4% and 3.7%, respectively. While the volume occupations of UGG-2 under 1.5 atm was only 0.17%, and continued to be steady even up to 5 atm with the increase of 0.45%, less than the critical index proposed for MSR of 0.5%. The UGG-2 could effectively inhibit liquid fluoride salt infiltration and was a promising candidate as neutron moderator or reflector materials for MSR.