Preparation of Biomorphic SiC/C Ceramics from Pine Wood via Supercritical Ethanol Infiltration

被引:0
|
作者
LI Jinhong
MA Hongwen and CHI Zhenqing 1 National Laboratory of Mineral Materials
2 Institute of Geology
机构
关键词
biomorphic SiC ceramics; supercritical infiltration; carbothermal reduction;
D O I
暂无
中图分类号
TQ174.1 [基础理论];
学科分类号
0805 ; 080502 ;
摘要
Biomorphic(wood derived) carbide ceramics with an overall composition in the SiC/C was produced by supercrifical ethanol infiltration of low viscosity tetraethylorthosilicate/supercritical ethanol into biologically derived carbon templates(C;-templates) and in situ hydrolysis into Si(OH);-gel,the Si(OH);-gel was calcined at 1400℃to promote the polycondensation of Si(OH);-gel into SiO;-phase and then carbonthermal reduction of the SiO;with the biocarbon template into highly porous,biomorphic SiC/C ceramics.The phases and morphology conversion mechanism of resulting porous SiC/C ceramics have been investigated by X-ray diffraction(XRD),scanning electron microscopy (SEM),transmission electron microscopy(TEM),and Fourier transform infrared spectroscopy(FT-IR).Experimental results showed that the biomorphic cellular morphology of pinewood charcoal was remained in the porous SiC/C ceramic with high precision that consisted ofβ-SiC with minority ofα-SiC and the remain free carbon existed in amorphous phase.
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页码:674 / 680
页数:7
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