高分散微细La_2O_3水悬浮液的球磨工艺及分散机理  

Ball milling process & diffusion mechanism on water slurry of micro La_2O_3 with excellent capability of dispersion

作　　者：江世好[1] 黎向锋[1] 左敦稳[1] 王宏宇[2] 柳振平[1] 许瑞华[1] 

机构地区：[1]南京航空航天大学机电学院,江苏南京210016 [2]江苏大学机械工程学院,江苏镇江212013

出　　处：《功能材料》2012年第13期1797-1801,共5页Journal of Functional Materials

基　　金：航空科学基金资助项目(2010ZE52056);江苏省自然科学基金资助项目(BK2011479);南京航空航天大学基本科研业务费专项科研资助项目(NUAA2010ZE52056);南京航空航天大学2011年度研究生创新基地(实验室)开放基金资助项目(NUAA201102)

摘　　要：采用正交实验和单因素实验相结合的方法,研究了球磨工艺参数(包括粉体质量分数、球磨机转速、球磨时间、球料比和球配比)对微细La2O3水悬浮液分散性的影响及其作用机理,获得了优化后的球磨工艺参数,据此制备出的悬浮液的粉体分散率高达97.88%。粒度测试结果表明采用优化的工艺参数球磨后得到的La2O3颗粒更加细小,分布更加均匀,计算出单个粒径为6μm的La2O3颗粒经过球磨后可以得到球径为1.5μm的颗粒数与球径为0.25μm的颗粒数之比约为1∶195。根据Stokes定律和爱因斯坦方程获得了微细La2O3颗粒沉降位移及扩散位移与其粒度间的函数曲线,从而揭示出采用优化球磨工艺参数球磨后微细La2O3水悬浮液的高分散机理。Both orthogonal experiment and single factor experiment were used to investigate the effect of ball milling process （including the mass fraction of the powder, rotation speed, milling time, weight ratio of ball to slurry and ball ratio） on the dispersion of water slurry with micro La2O3 powder, and its mechanism was stud- ied. The optimized process parameters were obtained, and it can make the dispersion rate of the slurry arrive to 97.88%. It has been found that the micro La2O3 particles were smaller with uniformly distribution than before by measuring particles size distribution under the optimized process parameters of ball milling. Calculation re- sult showed that one La2O3 particle of 6 micron was break down to 1.5 and 0.25μm with about 1 ： 195 ratio. The curve of settling displacement and diffusion displacement with granularity was given according to the Stokes law and Einstein equation. Settling displacement was equal to diffusion displacement when the particle diameter was 0.23μm, which can be calculated from above curve. And the diffusion mechanism on water slurry of micro La2O3 with excellent capability of dispersion after ball milling with the optimized process parameters was revealed.

关 键 词：La2O3水悬浮液 球磨工艺 分散 

分 类 号：TB34[一般工业技术—材料科学与工程]