【作者】 袁方利； 闫世凯； 胡鹏； 白柳杨； 李晋林； 柯家骏；

【Author】 Yuan Fangli, Yan Shikai, Hu Peng, Bai Liuyang, Li Jinlin, Ke Jiajun (Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China; Graduate University of Chinese Academy of Sciences, Beijing 100049, China)

【机构】 中国科学院过程工程研究所；

【摘要】 采用高频等离子体弧对羰基镍粉进行球形化研究。探讨了镍粉在等离子体弧中的传热过程,根据一维颗粒-等离子体传热模型, 计算了实验条件下最大理论球化粒径。分别用霍尔流动仪和SEM表征球化前后镍粉的松装比重和颗粒形貌。结果表明,由小片状镍颗粒团聚而成的立方形羰基镍粉,经过等离子体弧球化后,镍粉颗粒变小且呈球形,粉体松装密度减小。球化后得到的亚微米颗粒与组成羰基镍粉的片状镍颗粒的大小基本一致,表明羰基镍粉在球化过程中被打开、分散成小镍片后各自完成球化。更多还原

【Abstract】 Spherical submicron nickel powders for multilayer ceramic capacitors (MLCC) were prepared by using carbonyl nickel powder as precursor in radio frequency thermal plasma flame. The heat transfer between nickel particles and plasma was calculated theoretically, and the particle formation mechanism was discussed. Apparent density and particle morphology of both raw materials and the plasma processed powders were characterized using Hall flowmeter and SEM, respectively. The results show that particle size, which is as large as the comprising plate-like particles of the carbonyl nickel powder, becomes much smaller compared to that of the precursor.更多还原