高能机械球磨法制备高质量纳米β-SiC粉体

Synthesis of SiC nano-powder by high-energy mechanical ball milling

使用高能机械球磨法,首次以单质硅和石墨的混合粉体为初始原料,制备出了高质量的β-SiC纳米粉体。对球磨产物进行了XRD和TEM等表征,结果表明:球磨10h后,石墨粉完全非晶化,大部分硅粉也已经非晶化,而且已经有β-SiC纳米粉生成;球磨20h后,硅粉和石墨粉完全反应生成了单相的β-SiC纳米粉,平均晶粒尺寸约为20nm,但是团聚比较明显;球磨40h后的样品,平均晶粒尺寸约为12nm,而且样品分散性较好,为均匀的球形颗粒;继续增加球磨时间,虽然样品晶粒尺寸稍有减小,但是团聚又逐渐变明显,而且样品中混入铁的量逐渐增加。

Using the mixture of Simple Substance Silicon powder and graphite powder as the starting material, the single-phase β-SIC nanometer powder was prepared by high-energy mechanical ball milling. The synthesis products were characterized by XRD and TEM, and the results showed that, after being milled for 10h, graphite and most of Silicon were amorphous and massive β-SIC was synthesized; after being milled for 20h, graphite completely reacted with Silicon into β-SIC with the average grain size of 20nm, but the phenomenon of agglomeration was obvious; after being milled for 40h, the average grain size of β-SiC was decreased to 12nm, and the products was global particles with a good separation; after being milled for 80h, although the grain size was finer, the agglomeration became obvious again.