摘要
以椴木木炭为生物碳模板,利用气相反应性渗入法制成了一种具有木材结构的多孔SiC陶瓷。采用X射线衍射分析,红外光谱和扫描电镜对其物相变化和显微结构进行了表征。实验结果表明:随反应时间的延长,木炭的转化率增大,弯曲强度显著提高,而气孔率变化不明显。在1600℃下反应8h,木炭几乎完全转变成βSiC,并高度保持椴木的微观结构,弯曲强度和气孔率分别为41.6MPa和53.2%。对气相SiO在木炭中的渗入反应机理进行了探讨。
A novel porous SiC ceramic with a wood-like microstructure was prepared by the reactive infiltration of gaseous silicon monoxide into a porous bio-carbon template derived from basswood. X-ray diffraction, Fourier transform infrared spectroscope and scanning electron microscopy were employed to characterize the phase transformation and structural changes during the conversion of basswood charcoal into porous SiC ceramic. The experimental results show that the biomorphologic cellular morphology of basswood charcoal tissue is retained in the resulting porous SiC ceramic with high precision, and that the reaction degree of charcoal increases, the bending strength significantly increases, while the porosity does not change greatly as the reaction time increases. After the reaction for 8 h at 1600°C, basswood charcoal converts into SiC ceramic nearly completely, and the bending strength and the porosity are 41.6 MPa and 53.2%, respectively. The reactive infiltration mechanism of gaseous silicon monoxide into charcoal is also discussed.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第4期497-501,共5页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(50272051)资助项目。~~
关键词
多孔陶瓷
碳化硅
木材
碳化
反应性渗入
Bending strength
Carbonization
Ceramic materials
Charcoal
Crystal microstructure
Fourier transform infrared spectroscopy
Infiltration
Morphology
Phase transitions
Porous materials
Scanning electron microscopy
X ray diffraction analysis
