摘要
玉米经高温热解转化为生物碳模板,通过液相渗硅反应制备了具有生物形态微观结构的多孔SiC催化载体材料。借助X射线衍射(XRD)和扫描电镜(SEM)对样品的物相和微观结构进行了表征,通过阿基米德法测定了产物的表观气孔率。实验结果表明,最终产物由β-SiC、Si和少量的α-SiC组成;多孔SiC遗传了玉米模板的蜂窝状多孔结构;随着起始硅碳比的增加,SiC含量和残余硅量均有所增加,生物碳模板向多孔SiC陶瓷的转变使显气孔率从93.14%降至86.03%。
Biomorphic porous SiC ceramics were produced from maize via replication method.The maize was first carbonized in inert atmosphere to obtain a biocarbon template, followed by reactive infiltration of the biocarbon preforms with liquid silicon at 1500℃.The microstructure morphology and component analysis of the cellular SiC were investigated by means of scanning electron microscope（SEM）and X-ray diffraction（XRD）.The archimedes was used to test the apparent porosity of porous SiC ceramic.The samples consist mainly ofβ-SiC phase and Si phase and a littleα-SiC.The SiC replicas faithfully reproduced the macrostructure of maize and exhibited an open porosity 86.03%.
出处
《石油化工应用》
CAS
2009年第8期8-10,共3页
Petrochemical Industry Application
基金
国教育部国家级大学生创新性实验(08L04)资助项目
教育部科学技术研究重点资助项目(203143)
关键词
玉米
生物形态碳化硅
液相渗硅工艺
微观结构
maize
biomorphic silicon carbide
liquid silicon infiltration processing（LSIP）
microstructure
