悬浮燃烧合成二氧化硅中的粉体球化机制

Suspension Combustion Synthesized SiO_2 and Its Spherical Shaping Mechanism

以Si粉为原料,利用悬浮燃烧技术于1000℃下合成了球形二氧化硅粉体。产物在XRD图谱中,于2θ=22°左右有1个宽峰;且XRF结果显示,产物中硅氧比为1:1.95。同时SEM照片表明,产物呈完整的球形,粒径在50～500nm之间分布。本文重点讨论了硅粉在悬浮燃烧过程中的球形化机制。

Spherical and fine-sized SiO2 powders were directly prepared using suspension combustion at 1000 ℃ from Si powders. The spherical powders had broad peaks at around 22° in the XRD spectrum. The shape of the prepared SiO2 powders was spherical and the mean size of them was 100 nm. Both above could be seen by SEM. Furthermore, spherical shape mechanism of powders in suspension combustion is discussed.