摘要
采用循环水冷却和循环等离子体工作气体的改进方法,制备出纳米铁粉。当电流为500 A,气体总压为0.03 MPa,电压为32 V,氢气含量为50%,风机转速为2 400 r/min时,铁粉产率可高达6.2 g/min,其平均粒径为50 nm。粒子大多呈球形,表面光滑,粒子大小均匀,连接成链状。但是有些大颗粒粒径达到微米级,这主要是团聚所致。实验中制备的纳米铁颗粒为层状结构,由内到外依次是Fe-Fe3O4-Fe2O3,Fe3O4和Fe2O3的含量很低,但起到了对纳米粒子的保护作用。
Nanometer iron powder was prepared by utilizing modified the circulating water and plasma gas. When the current, total pressure, voltage, H2 content and fan rotating rate are 500 A, 0.03 MPa, 32 V, 50% and 2 400 r/min respectively, the yielding output can reach up to 6.2 g/min and the average diameter of powder is 50 nm. Most of nano-iron powder are spherical and has smooth surface, the size of particles is uniform and these particle is chainlinked. However, some particles have micro-magnitude size due to the congregation. Nano-iron powder has core-shell structure, the outer shell and the core correspond to oxide and Fe. The order is Fe-Fe3O4-Fe2O3 from the inner to the outer. The content of Fe3O4 and Fe2O3 is very low, but they play a protective role for nanometer particles.
出处
《铸造技术》
CAS
北大核心
2007年第3期425-428,共4页
Foundry Technology
基金
江苏省无机及其复合新材料重点实验室
江苏省生态环境材料重点建设实验室资助
关键词
高产率
纳米铁粉
制备
High productivity
Nanometer iron powder
Preparation
