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Preparation of ZrC-SiC Multi-coating on Graphite with ZrSiO_4 Powder via Pack Cementation

YANG Xin,HUANG Qi-Zhong,CHANG Xin,SU Zhe-An,ZHANG Ming-Yu,ZHOU Le-Ping,JIN Gu-Yin(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)  
To improve the oxidation resistance of graphite at high temperature,a dense ZrC-SiC multi-coating was prepared on graphite with ZrSiO_4 powder by pack cementation.The structure and morphology of the multi-coating were characterized by XRD,SEM and EDS analysis,and the formation of the coating was discussed with thermodynamics calculation.The results show that the coating has a double-layer structure,which consists of SiC-rich inner layer and ZrC out layer.Besides ZrC and SiC phases,SiC crystals are also formed in the coating.The formation of the double-layer structure is primarily attributed to the different generation temperatures of the reductive products in the system,and the dense structure of the multi-coating can be obtained due to the excellent flowing and filling ability of the liquid Zr formed in the preparation process.
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