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碳化硅纳米粉是基于燃烧的方法合成的,燃烧合成在还原SiO2-Mg-C系统中进行,具有不同形态和平均粒径尺寸的二氧化硅粉作为初始粉末。结果说明,甚至可以用微米级的二氧化硅来合成纳米级的碳化硅粉。然而,合成的SiC颗粒的比表面积随二氧化硅前躯体粒径的减小而增大。对燃烧波中碳化硅的形成机理也进行了讨论。
Silicon carbide nanopowders are synthesized on a combustion-based method and combustion synthesis is carried out in a reduced SiO2-Mg-C system with silica powders of different morphologies and average particle size as starting powders. The results show that it is even possible to synthesize nanoscale silicon carbide powders with micron-sized silica. However, the specific surface area of the synthesized SiC particles increases with decreasing particle size of the silica precursor. The formation mechanism of silicon carbide in the combustion wave is also discussed.