摘要
在针形γ-Fe_2O_3磁粉制备过程中,还原过程是关键步骤之一,本文利用程序升温还原技术研究了针形超微粒a-Fe_2O_3还原过程机理,建立了还原过程动力学研究方法,得到了a-Fe_2O_3在氮氢混合气体中还原动力学方程,并进一步研究了该还原过程动力学特征,给出了还原过程的优化操作条件.
The reduction process is very important for acicular magnetic powder preparation. In this paper, the mechanism of acicular ultrafine a-Fe2O3 particle reduction process was investigated by TPR, The study method for reduction kinetics was established and the operation condition was investigated. The kinetic equation for α-Fe2O3 reduction was proposed. This equation can be used at 300℃-450℃ for the reduction of pure α-Fe2O3 particles. The optimized temperature for acicular α- Fe2O3 powder reduction was at 360℃-400℃.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1995年第6期734-740,共7页
CIESC Journal
基金
国家自然科学基金资助项目
关键词
磁粉
Α-FE2O3
还原
超微粒
程序升温
氧化铁
magnetic powder, α - Fe2O3, reduction mechanism, kinetics, ultrafine powder
