The Research on Preparation of Micro-nanometer Iron Powder by Reduction at Low Temperature
Reduction of micro-nanometer iron oxide powder at low temperature to prepare superfine iron powder was investigated. Ferric oxide powder with micro-nanometer size was prepared by high-energy milling and then reduced with hydrogen at different temperature and in different holding time. The content of oxygen of the reduced iron powder was tested and the reduction rate was determined. Then the powder particle size and distribution were measured, and the apparent appearance was observed under the SEM. The optimum process parameters about producing superfine iron powder were obtained by respective change the process parameters such as temperature, reaction time It is expected to found out relationship between the particle size of ferric oxide powder, temperature and holding time and the reduction rate of ferric oxide powder as well as particle size, distribution and apparent appearance of the reduced iron powder. It is found that apparent surface area and surface energy of micrometer ferric oxide powder smashed by high-energy milling are considerably large, so that its activity is elevated greatly. As a result, the milled ferric oxide powder was reduced, even though at the temperature low to 280℃, with the reduction rate surpassed 50％ for 3 min. The reduction rate was up to 97.1 for reduction at 400℃ in 20min. Due to much low reaction temperature, the drive of the powder growth is decreased greatly and the size of iron powder got access to the size of micro-nanometer. Lower than 0.4 mm iron powder was prepared with 0.35 mm ferric oxide powder by hydrogen reduction at 400℃.
high-energy milling reduction of ferric oxide powder superfine iron powder particle size & distribution
王兴庆 钟军华
上海大学材料学院 上海 200072
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）