球磨对碳化硼粒度及游离碳的影响  

Influence of Ball Milling on Boron Carbide's Particle Size and Content of Free C

作　　者：王慧华[1,2] 孙树臣[2] 王德永[2] 涂赣峰[2] 马伟民[1] 郭卓[1] 曹大力[1] 马雷[1] 

机构地区：[1]沈阳化工大学材料科学与工程学院,辽宁沈阳110142 [2]东北大学材料与冶金学院,辽宁沈阳110006

出　　处：《沈阳化工大学学报》2012年第1期53-56,62,共5页Journal of Shenyang University of Chemical Technology

基　　金：国家自然科学基金资助项目(50904017)

摘　　要：主要研究球磨因素对碳化硼粒度分布的影响,并考察游离碳含量随球磨时间的变化规律.实验结果表明:随着球磨时间增加,碳化硼粒径分布曲线向粒径小的方向移动,当球磨时间达到60 h,粉体粒径细化程度减缓,继续球磨可进一步提高超细颗粒含量;当球磨时间达到一定程度,不同的球料比对粉体粒径分布曲线影响较小;游离碳含量随着球磨时间增加而提高,在20～40 h碳含量增加显著,之后增加缓慢;SEM电镜显示球磨前后粉体显微形貌发生显著变化;XRD分析显示球磨60 h后粉体中出现很强的游离碳衍射峰.Boron carbide powders show wide application advantages in the fields of wear-resistant materials and high-hardness ceramics.The ball milling technologies have strong effect on the particle size of boron carbide.The influence of milling factors on particle size distribution of boron carbide and the content of free C with increasing milling time were investigated in this paper.The results show that the particle size distribution curve of boron carbide shifted to small size direction with increasing milling time;the refinement slowed down when after milling for 60 h and the concentration of ultrafine particles could be improved with further milling.The different ball-to-powder mass ratio had slight effect on particle size distribution curve of boron carbide when the milling time reached a certain level.The content of free C increased significantly in the range of 20~40 h and became marginally after further milling.The morphologies of the starting material and milled powder were observed by scanning electronic microscopy.X-ray diffraction showed that some strong diffractions of free C were detected after milling for 60 h.

关 键 词：碳化硼 球磨 粒度分布 SEM分析 

分 类 号：TQ174[化学工程—陶瓷工业]