摘要
以淀粉(经85℃糊化)为碳源,正硅酸乙酯(TEOS)为硅源,通过溶胶-凝胶法制备了淀粉-SiO2混合凝胶,将混合干凝胶在动态真空条件下进行碳热还原制备碳化硅(SiC)。用TGA、XRD、SEM及N2低温物理吸附等手段对淀粉-SiO2混合凝胶和碳热还原产物进行表征。结果表明,在950℃动态真空条件下即可合成出晶粒尺寸约为50nm,结晶度较高的β-SiC。
Starch, prepared by heating starch suspension at 85℃, and tetraethoxysilane (TEOS) have been allowed for a sol-gel reaction to prepare starch-SiO2 hybrids gel. The SiC was synthesized via carbothermal reduction of dried starch-SiO2 hybrids gel. Dried starch-SiO2 hybrids gel and as-prepared products were characterized by TGA, XRD, SEM and low temperature N2 adsorption-desorption measurement. The results showed that high crystalline B-SiC with average crystalline size of 50 nm could be synthesized at 950℃ under dynamic vacuum condition.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2008年第10期1700-1702,共3页
Journal of Functional Materials
基金
国家自然科学基金资助项目(20576021)
福建省自然科学基金计划资助项目(E0710004)