射频等离子体制备球形钨粉的研究  

Preparation of Spherical Tungsten Powder by RF Induction Plasma

作　　者：盛艳伟[1] 郝俊杰[1] 郭志猛[1] 邵慧萍[1] 黄化[1] 

机构地区：[1]北京科技大学,北京100083

出　　处：《稀有金属材料与工程》2011年第11期2033-2037,共5页Rare Metal Materials and Engineering

基　　金：新金属材料国家重点实验室开放基金(2010Z-09);北京市先进粉末冶金材料与技术重点实验室开放基金

摘　　要：通过射频等离子体球化处理工艺,以不规则形状钨粉为原料,制备了球形钨粉,并研究了加料速率和粉末粒度对粉末球化率的影响。采用扫描电子显微镜、X射线衍射和激光粒度分析仪对球化处理前后粉末的形貌、物相和粒度分布进行了测试和分析。结果表明:粒度在5.5～26.5μm范围的不规则形状钨粉,经等离子球化处理后得到表面光滑、分散性好、球化率可达100%的球形钨粉。球化处理后,粉末的粒度略微增大。随加料速率的增加,钨粉的球化率降低。随着钨粉球化率的提高,粉末的松装密度和流动性得到显著改善。松装密度由6.80g/cm3提高到11.5g/cm3,粉末流动性由14.12s/50g提高为6.95s/50g。Spherical tungsten powder was prepared by radio frequency（RF） plasma with irregular tungsten powder as starting material.The effect of feeding rate and particle size on the spheroidization efficiency was studied.The phase composition,morphologies and particle size distributions of the powder before and after spheroidization were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM） and laser micron sizer（LMS）.The results show that the spherical tungsten powder can be obtained from irregular powder with particle size of 5.5-26.5 μm after RF plasma spheroidization.The powder presents smooth surface and good dispersity,and the spheroidization efficiency is almost 100%.The particle size of tungsten powder is increased slightly after plasma treatment.The spheroidization efficiency of the sample decreases gradually with increasing of the feeding rate.The loose density and powder flowability of tungsten powder are enhanced greatly after RF plasma processing.The loose density is raised from 6.80 g/cm3 to 11.5 g/cm3 and the powder flowability is improved from 14.12 s/50 g to 6.95 s/50 g.

关 键 词：射频等离子体 球形钨粉 球化处理 球化率 

分 类 号：TF125.241[冶金工程—粉末冶金]