Liu, ZJ (reprint author), Chinese Acad Sci, Inst Coal Chem, Key Lab Carbon Mat, Taiyuan 030001, Peoples R China.
; Song, JL
; Huai, P (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Key Lab Nucl Radiat & Nucl Energy Technol, Shanghai 201800, Peoples R China.
文章类型:
期刊文献
英文摘要:
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 mu m. 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 mm. 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. (C) 2016 Elsevier Ltd. All rights reserved.
Lian, PF,Song, JL,Liu, ZJ,et al. Preparation of ultrafine-grain graphite by liquid dispersion technique for inhibiting the liquid fluoride salt infiltration[J]. CARBON,2016-01-01,102(-):208—215.
