摘要
以硅溶胶为硅源,淀粉为碳源,采用低温碳热还原法合成了SiC微粉。实验结果表明:淀粉热解得到的碳颗粒和硅溶胶中的SiO2能形成较好的包覆,增大了接触面积,促进了反应的进行。在1700℃下反应1h,反应前驱体全部转化为β-SiC,产物为SiC颗粒和纳米棒的混合物。升高反应温度和延长反应时间都能显著增加转化率。但温度过高会导致晶粒长大。
SiC powders are synthesized by reducing silica with amylum in a flow argon atmosphere at 1500℃, 1600℃ and 1700℃, respectively. Experiments results show that the reaction precursors can be completely transformed into β-SiC at 1700℃ for lh. The synthesized products are mainly composed of equiaxial β-SiC particles with the size of around 100nm and nanorods with the diameter of -500nm and the length of -20μm. The increased reaction temperature and extended reaction time will greatly increase the production of SiC. However, the excessive high temperature will lead to the quick growth of SiC crystalline grains.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2008年第2期126-128,共3页
Materials Reports
基金
国家自然科学基金(50472094)
关键词
SIC微粉
前驱体
碳热还原法
SiC powder, precursors, carbothermal reduction
作者简介
王福：男，1975年生，博士研究生
曹文斌：通讯作者，教授E-mail：wbcao@mater．ustb．edu.cn
