【摘要】 采用高能球磨的方法,直接分散铋粒制备纳米铋粉。实验选用无水乙醇为液相介质、聚乙烯吡咯烷酮(PVP)和硬脂酸作为复合修饰剂,通过正交实验研究铋粒的加入量、复合修饰剂的相对用量、转速和时间等工艺参数对纳米铋粉的产量、产率和粉体的特征数据D50的影响。研究表明:本方法能够制备出纯净的纳米铋粉;适当增加铋粒的加入量,减少修饰剂的相对用量,降低转速,适当缩短时间,有利于降低颗粒的平均粒径,提高纳米铋粉的产量和产率。在本试验条件下,制备纳米铋粉的优化参数为铋粒加入量取0.06 mol,复合修饰剂与铋粒的质量比为1∶3,转速取250 r/m in,时间为4 h。更多还原

【Abstract】 prepared Bi nanoparticles were prepared by high energy ball milling,using absolute ethanol as liquid medium,PVP and stearic acid as compound modifying reagent,by orthogonal experimental method.The relations between technological parameters(molar weight of bismuth grains,relative dosage of compound modifying reagent,rotating speed and time) and quality indexes(output,productive rate of Bi nanoparticles and the eigenvalue D50 were studied.The investigate indicates that pure Bi nanopaticles can be prepared by this method;output and productive rate of Bi nanoparticles can be increased and average particle diameter can be decreased by adding molar weight of bismuth grains properly,decreasing relative dosage of compound modifying reagent,reducing rotating speed and shortening reaction time;the optimized parameters are 0.06 mol of bismuth grains,1∶3 as mass ratio of bismuth grains and compound modifying reagent with rotate speed of 250 r/min and the time of 4 h.更多还原