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Preparation of Biomorphic SiC/C Ceramics from Pine Wood via Supercritical Ethanol Infiltration
Author(s) -
Jinhong LI,
Hongwen MA,
Zhenqing CHI
Publication year - 2007
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2007.tb00991.x
Subject(s) - materials science , scanning electron microscope , ceramic , supercritical fluid , chemical engineering , silicon carbide , fourier transform infrared spectroscopy , transmission electron microscopy , amorphous solid , sol gel , porosity , calcination , composite material , organic chemistry , catalysis , nanotechnology , chemistry , engineering
Biomorphic (wood derived) carbide ceramics with an overall composition in the SiC/C was produced by supercritical ethanol infiltration of low viscosity tetraethylorthosilicate/supercritical ethanol into biologically derived carbon templates (C B ‐templates) and in situ hydrolysis into Si(OH) 4 ‐gel, the Si(OH) 4 ‐gel was calcined at 1400° C to promote the polycondensation of Si(OH) 4 ‐gel into SiO 2 ‐phase and then carbonthermal reduction of the SiO 2 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 of β‐SiC with minority of α‐SiC and the remain free carbon existed in amorphous phase.