Modification process has been conducted on commercial nuclear graphite IG-110 (Toyo Tanso Co., Ltd., Japan) by impregnation and pyrolysis of polycarbosilane (PCS) solution for getting the modified IG-110 (M-IG-110) coated by dense SiC coating for molten salt reactor. The microstructure and properties of graphite were systematically investigated and compared before and after the modification process. Results indicated that the M-IG-110 possessed of more excellent integrated properties including molten salt barrier property and oxidation resistance than bare IG-110 due to the filling effect of SiC particles in the pores of M-IG-110 and dense SiC coating adhering to the surface of M-IG-110. The fluoride salt infiltration amount of M-IG-110 under 5 atm was only 1.1 wt%, which was much less than 14.9 wt% for bare IG-110. The SiC coating derived from PCS exhibited remarkable compatibility with graphite substrate under high temperature and gave rise to excellent oxidation resistance of M-IG-110.

通过对聚碳硅烷（PCS）溶液进行浸渍和热解，对商用核石墨IG-110（日本东洋炭素有限公司）进行了改性工艺，以获得致密的涂层IG-110（M-IG-110）。用于熔盐反应器的SiC涂层。对改性前后的石墨组织和性能进行了系统的研究和比较。结果表明，由于SiC颗粒在M-IG-110孔中的填充作用和致密SiC涂层的粘附，M-IG-110具有比裸IG-110更好的综合性能，包括熔融盐阻挡性和抗氧化性到M-IG-110的表面。M-IG-110在5个大气压下的氟化物盐渗透量仅为1.1重量％，远低于裸IG-110的14.9重量％。