高能球磨法制备纳米晶纯钨粉末的研究

STUDY ON PURE TUNGSTEN NANOCRYSTALLINE POWDERS PREPARED BY HIGH ENERGY BALL MILLING

通过高能球磨法制备了纳米纯钨粉末。着重研究了过程控制剂、球料比以及球磨时间对钨粉的晶粒尺寸、形貌的影响。通过X射线衍射仪(XRD)、场发射扫描电子显微镜(FE-SEM)对样品的结构、形貌进行了表征。研究结果表明:纳米纯钨粉末的最佳球磨参数为:5%(质量分数)过程控制剂(无水乙醇)、球料比约15∶1、球磨时间约50 h。在此参数下制备的粉末颗粒形状近似球状,其平均晶粒尺寸为15nm。

Pure W nanocrystalline powders were prepared by high energy ball milling(HEBM).The influences of process control agents(PCA),Ball-to-powders ratio and milling time on crystalline size,morphology of tungsten powders are investigated.The structure and morphology are studied by XRD and FE-SEM.The result showed that the optimal HEBM parameters are 5%wt PCA(anhydrous ethanol),ball-to-powders ratio 15∶1 and milling time 25h respectively.The milled powders show approximately spherical shape and its crystalline size reaches nearly 15nm under the optimum conditions.