摘要
木材经1200℃高温真空碳化生成生物模板(木炭),然后经气相Si、SiO的反应性渗人或经SiO_2溶胶真空/压力浸渍工艺和碳热还原反应过程制成多孔SiC陶瓷。借助SEM、XRD和FT-IR等方法对转变为多孔SiC过程中的显微结构、物相组成和物理化学结构变化进行了表征。试验结果表明:在木炭转变为多孔SiC的高温处理过程中,木炭的显微结构很好地留在了多孔SiC陶瓷中;生成的SiC主要是β-SiC。介绍了木炭转变为SiC陶瓷的过程与机理。
Biological carbon performs were derived from different wood structures by high-temperature pyrolysis at 1200℃under vacuum, used as templates for reactive infiltration of gaseous Si and SiO, or infiltrated with SiO2 sol via vacuum/res-sure infiltration followed by carbothermal reduction reaction at 1600℃in argon atmosphere to form SiC ceramics. SEM, XRD and FT-IR techniques were employed to characterize the microstructure, phases and physico-chemichal structure changes during wood-to-ceramics conversion. The results showed that the microstructure details of the bioorganic performs were retained during high-temperature processing, the resulting SiC mainly consisted of β-SiC. In addition, the mechanisms of biological carbon template-to-ceramic conversion via different methods were introduced.
出处
《陶瓷科学与艺术》
CAS
2003年第6期9-15,共7页
Ceramics Science & Art
关键词
SIC陶瓷
木材
碳化
多孔陶瓷
反应性渗人
碳热还原
生物材料
Wood Carbonization Porous Ceramics Biomorphic SiC Reactive Infiltration Carbothermal Reduction Reaction
