Reaction Mechanism of Silicon Carbide Ceramics Derived from Woods

Abstract

Abstract: The process of reaction of silicon carbide ceramics derived from wood was investigated. The reaction
mechanism was also analyzed. The results show that the temperature of silicon infiltration determines the ultimate microstructure of SiC
ceramics. Porous SiC materials are formed at lower temperature, while at higher temperature, compact Si/SiC composite materials formed.
The process of silicon-carbon reaction can be described as three steps: (1) Melted Si ascends via capillary of charcoal and reacts with contacted carbon forming silicon carbide.
(2) The thickness of SiC layer increases toward carbon layer till the end. (3) Reaction-formed SiC will re-crystallize in the later
stage of the reaction, and the ultimate microstructure is composed of large size of polygonal SiC and free Si.

Key words: wood, reaction mechanism, microstructure, silicon carbide

CLC Number:

TQ174

CAI Ning,MA Rong,QIAO Guan-Jun,JIN Zhi-Hao. Reaction Mechanism of Silicon Carbide Ceramics Derived from Woods[J]. Journal of Inorganic Materials.

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Reaction Mechanism of Silicon Carbide Ceramics Derived from Woods

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