Influence of Silicon Infiltration on Microstructure and Property of Graphite

Abstract

Abstract: Four kinds of graphite with different pore structure were selected for silicon infiltration (referred as infiltration) reaction.SEM,XRD,mercury intrusion porosimetry and CT methods were adopted to characterize the microstructure,phases and pore structure changes before and after the infiltration.The results show that the infiltrated samples are consisted of the graphite,silicon and silicon carbide,and the distribution of the silicon and silicon carbide is depended on the pore structure of the graphite.The porosities of all the infiltrated samples are lower than 1%,and the increase of the bulk density ranges from 21.08% to 35.94%.The strength of the infiltrated samples is 1.7 times to 6.2 times higher and the modulus is 2.7 times to 7 times higher than the graphite samples,and the increase of the strength is depended on the pore structure and crystal sizes of the graphite.Calculation results show that the infiltration process is controlled by the diffusion-reaction process.

Key words: graphite, ceramic matrix composite, silicon carbide, silicon infiltration, microstructure

CLC Number:

TQ174.7

YANG Jinhua, AI Yingjun, CHEN Zimu, LIU Hu, QI Zhe, LYU Xiaoxu, JIAO Jian. Influence of Silicon Infiltration on Microstructure and Property of Graphite[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 231-240.

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