摘要：研究用一种先进的高效能搅拌磨湿法制备纳米粒级的氧化铝(α-Al2O3)粉体。采用氮气吸附法测量不同研磨颗粒产品的比表面积,采用X射线沉降粒度仪、电超声粒度分析仪和扫描电镜测定和观察颗粒的粒径和形貌,采用X射线衍射法(XRD)进行晶形分析。结果表明,微米级给料在湿法研磨数小时后可得到一种平均粒径为70 nm和比表面积大于115 m²/g的纳米颗粒产品。经研磨α-Al2O3颗粒的晶体各主晶面均遭到不同程度破坏,但晶相仍为α相。另外,还发现,研磨过程中研磨氧化铝颗粒所需比能耗随着研磨时间的延长而增加,而能量利用效率迅速降低。

关键词：湿法研磨;高能搅拌磨;氧化铝;纳米颗粒;

Abstract：A mechanical preparation of the nano-sized alumina particles(α-Al₂O₃) by a high energy stirred bead mill in wet process was investigated.The specific surface area of the particles was measured by nitro-gen adsorption,the particle sizes of the ground products were determined by X-ray transmission particle size analyzer,acoustic particle sizer and scanning electronic microscopy(SEM),respectively.The crystal lattices were analyzed by using X-ray diffraction(XRD).The results showed that the ground product of α-Al₂O₃ obtained in the mill had the average size of 70 nm with the specific surface area above 115 m²/g after grinding for several hours.The main crystal planes of the ground particles were damaged in varying degrees,but the phase was still α-phase.Also,it was found that in the wet grinding process,the specific energy consumption increased with milling time,and the corresponding grinding efficiency reduced.

Keyword：wet grinding process;high-energy stirred bead mill;alumina;nano-particles;