Abstract

When preparing nano silicon powder by high-energy ball milling, the grain size of the obtained nano silicon powder varies with different technical parameters set in the ball milling process. In order to explore the impact of different ball milling technical parameters on the grain size of nano silicon powder, this paper adopted the orthogonal experimental design in combination with fitting analysis, and set the agitator shaft speed of the ball mill and the milling time as the influence factors. Then this paper studied the impact of different ball milling technical parameters on the grain size of nano silicon powder, so as to work out the fitting function model and the optimal technical parameters for preparing nano silicon powder by high-energy ball milling. The experimental results showed that when the ratio of grinding media to material is 20: 1, without considering the influence of other factors such as temperature and humidity, when the agitator shaft speed is 1100/1200 rpm and the milling time is 150 min, the smallest grain size of nano silicon powder could be obtained, and the fitting formula of the agitator shaft speed and grain size is most consistent with the Gaussian approximation, which is 5.157*exp(-((x-706.8)/297.2)^2). This research holds value for practical application.

摘要

高能球磨制备纳米硅粉时，所得纳米硅粉的粒度随球磨过程中设定的不同技术参数而变化。为了探究不同球磨技术参数对纳米硅粉粒度的影响，本文采用正交实验设计结合拟合分析，将球磨机搅拌轴转速和球磨时间设为影响因素。然后本文研究了不同球磨工艺参数对纳米硅粉粒径的影响，从而建立了拟合函数模型和高能球磨制备纳米硅粉的最佳工艺参数。实验结果表明，当研磨介质与物料的比例为20:1时，不考虑温度、湿度等其他因素的影响，当搅拌轴转速为1100/1200 rpm，球磨时间为150 min时，可以得到纳米硅粉的最小粒径，并得到搅拌器的拟合公式轴速和晶粒尺寸与高斯近似最一致，即 5.157*exp(-((x-706.8)/297.2)^2)。该研究具有实际应用价值。