Preparation of ZrC-SiC Multi-coating on Graphite with ZrSiO4 Powder via Pack Cementation

doi:10.3724/SP.J.1077.2010.00041

Abstract

Abstract: To improve the oxidation resistance of graphite at high temperature, a dense ZrC-SiC multi-coating was prepared on graphite with ZrSiO₄ 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.

Key words: graphite, anti-oxidation coating, ZrC, SiC

CLC Number:

TB332

YANG Xin,HUANG Qi-Zhong,CHANG Xin,SU Zhe-An,ZHANG Ming-Yu,ZHOU Le-Ping,JIN Gu-Yin. Preparation of ZrC-SiC Multi-coating on Graphite with ZrSiO₄ Powder via Pack Cementation[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00041.

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Preparation of ZrC-SiC Multi-coating on Graphite with ZrSiO₄ Powder via Pack Cementation

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