摘要
利用气雾化技术制备球形TC4合金粉末,利用SEM、同步辐射CT扫描-三维重建等分析手段对异常颗粒粉体以及不同粒径的TC4合金粉末表面和内部的孔缺陷进行了表征。实验结果表明,制备的TC4合金粉末随着粉末粒径减小,粉体表面由凸凹不平的冷凝收缩痕迹渐变为光滑表面,粉体内部的孔隙逐渐减少,且孔隙尺寸也随之减小。由于雾化过程中凝固与球化时间的差异及飞行轨迹的不同等原因导致了包裹式、连体式、椭球形、卫星粉等异常粉末颗粒的生成;同步辐射CT扫描-三维重建表明,粉末内部的孔隙率和孔隙尺寸随着粉末粒度的增大而增大。
The spherical TC4 alloy powders were prepared by gas atomization.The surface and internal pore defects of TC4 alloy powders with different particle sizes were characterized by SEM,synchrotron radiation CT scanning and three-dimensional reconstruction.The experimental results show that the surface of the powder gradually changes from the condensed shrinkage trace to smooth surface with the decrease of particle size.The number and size of pores in powders also gradually decrease with the decrease of particle size.The formation of anomalous powders with the morphologies of wrapping,conjoined,ellipsoid and satellite is resulted from the difference of coagulation and spheroidization time and the different flight trajectories during the atomization process.The results of three-dimensional reconstruction by synchrotron radiation CT scanning show that the porosity and pore size of the powder increase with the increase of particle size .
作者
赵少阳
汤慧萍
陈刚
殷京瓯
王建
葛渊
李增峰
谈萍
Zhao Shaoyang;Tang Huiping;Chen Gang;Yin Jing'ou;Wang Jian;Ge Yuan;Li Zengfeng;Tan Ping(State Key Laboratory of Porous Metal Materials,Northwest Institute for Nonferrous Metal Research,Xi'an 710016,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第12期3853-3859,共7页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51604228)
陕西省科技统筹创新工程项目(2016KTZDCY-02-01)
