纳米钛酸钡颗粒砂磨分散工艺研究

Research on Dispersion Process of Nanoparticles BaTiO3 by Beads Mill

本文研究了使用砂磨机进行纳米颗粒分散时的流量设定和磨球选择。为了确保砂磨过程中磨球不会逸出或者聚集在砂磨机的一端,浆料在研磨腔体中的上升速度应小于浆料液面上升速度,因此使用不同粒径的磨球都有最大限制流量。研磨过程的分散效率采用田中粉碎方程进行计算,结合实验结果可以计算出被粉碎钛酸钡颗粒的粉碎强度,结合分散效率的曲线可计算出适当的磨球粒径,实验中要达到较高的分散效率,所需的磨球粒径为0.08~0.10mm。

In the dispersion of agglomerated oxide nanoparticles BaTiO3by a beads mill,a method for determining both flow rate and optimum beads size was investigated.The maximum flow rate of slurry depends on the sinking speed of the grinding balls in the slurry,in order to prevent the grinding balls from escaping or collecting near the separator,the flow rate must be less than the sinking speed of the grinding balls.The relationship between the optimum bead size and the breaking strength of agglomerated nanoparticles for each circumferential speed was estimated from the comparison between experimental results at different bead sizes,and the equation suggested by Tanaka.The strength of the BaTiO3particles can be calculated based on the experimental results.The appropriate size of beads can be calculated based on the curve of the dispersion efficiency.For dispersion efficiency,the required particle size of the grinding ball is 0.08~0.10mm.