WANG Zhaoxuan, DENG Guodong, WANG Weibin, XIE Liang
(National Special Superfine Powder Engineering Research Center of China, Nanjing University of Science and Technology, Nanjing 210094, China)
Abstract: Ultrafine charcoal powder was prepared by ball milling with coarse charcoal powder with median particle size of 287 μm as raw material and stainless steel ball as grinding medium.The working parameters of bidirectional rotary ball mill were optimized.The particle size distribution, specific surface area and microstructure of coarse and ultrafine charcoal powder were measured and characterized.The influence of ultrafine carbon powder on iodine adsorption value and thermal decomposition performance of sulfur-free black powder were studied.The results show that the optimal working parameters of the bidirectional rotary ball mill for the preparation of ultrafine charcoal powder are as follows: the ratio of ball volume to cylinder volume is 0.7, the mass ratio of ball to material is 10∶1, the rotational speed of the spherical cylinder is 120 r/min, the rotational speed of the agitator is 80 r/min, and the grinding time is 6 h.The ultrafine charcoal powder prepared with the best working parameters has particle size of about 2.30 μm, narrow particle size distribution and specific surface area of 852.01 m2/g.The iodine adsorption value of ultrafine charcoal powder can reach 1 049 mg/g, which is easier to adsorb small molecule impurities.Compared with coarse charcoal powder, the thermal decomposition temperature of sulfur-free black powder prepared by ultrafine charcoal powder is reduced by about 30 ℃, and the thermal decomposition exothermic peak temperature is reduced by about 50 ℃.Refining the particle size of charcoal powder can effectively improve the ignition performance of sulfur-free black powder.
Keywords: coarse charcoal powder; ultrafine charcoal powder; iodine adsorption value; sulfur-free black powder; thermal decomposition characteristic
中图分类号： TB44 文献标志码：A
文章编号：1008-5548(2022)01-0068-08
DOI:10.13732/j.issn.1008-5548.2022.01.008
收稿日期： 2021-05-28，修回日期：2021-11-11，在线出版时间：2021-12-02。
基金项目：国防科研专项项目，编号：AS03144。
第一作者简介：王照轩(1997—)，男，硕士研究生，研究方向为微纳米粉体制备技术及应用。E-mail：1035635077@qq.com。
通信作者简介：邓国栋(1965—)，男，副研究员，学士，硕士生导师，研究方向为含能材料等微纳米粉体制备技术。E-mail：13505196092@163.com。
