摘要
以不规则形状铌粉为原料,通过射频等离子体球化处理制备球形铌粉,并研究加料速率对粉末球化率的影响。采用扫描电镜、X射线衍射仪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测试和分析。结果表明:不同粒径的不规则形状铌粉,经等离子球化处理后均可得到表面光滑、分散性好、球化率可达100%的球形铌粉。球化处理后,粉末的粒度分布变窄。随加料速率的增加,铌粉的球化率降低。经射频等离子体处理后,铌粉的松装密度和流动性得到显著改善:松装密度由1.33 g/cm3提高到4.35 g/cm3,振实密度从1.95 g/cm3提高到5.61 g/cm3,粉末流动性提高到12.51 s/(50 g)。
Spherical niobium powders were prepared by radio frequency （RF） plasma from irregular niobium powders. The effect of feeding rate on the spheroidization efficiency was studied. The phase composition, morphology and particle size distribution of the powders before and after spheroidization were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and laser micron sizer （LMS）. The results show that niobium powders after plasma processing have good dispersity and smooth surfaces, and spheroidization ratio is almost 100%. The particle size distribution becomes narrow after spheroidizing. The loose density, tap density and powder flowability significantly increases after the treatment. The loose density increases from 1.33 g/cm3 to 4.35 g/cm3 and tap density increases from 1.95 g/cm3 to 5.61 g/cm3. The powder flowbility increases to 12.51 s/（50 g）. With increasing the feeding rate, the spheroidization ratio of niobium powders drops gradually.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2014年第3期361-366,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(51274039)
高等学校博士学科点专项科研基金博导类资助课题(20120006110007)
关键词
射频等离子体
球形铌粉
球化率
RF plasma
spherical niobium powder
spheroidization rate
