超细类球形钴粉的可控制备及调控机理  

Controllable preparation and regulation mechanism of ultrafine spherical cobalt powders

作　　者：刘柏雄[1] 黄少勇 刘智平 赵文敏 LIU Baixiong;HUANG Shaoyong;LIU Zhiping;ZHAO Wenmin(Department of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学材料冶金化学学部,赣州341000

出　　处：《粉末冶金技术》2024年第6期609-620,共12页Powder Metallurgy Technology

基　　金：江西省重大科技研发专项资助项目(20223AAG01009);江西理工大学先进人才科研启动基金资助项目(205200100628)。

摘　　要：以CoCl_(2)·6H_(2)O和NH4HCO_(3)为原料,通过液相沉淀法制备出粒径细小、均匀可控的CoCO_(3)前驱体,再经过煅烧–氢还原法制备出超细类球形钴粉。分析液相沉淀法中搅拌时间和反应温度对CoCO_(3)前驱体粒径及形貌的影响,讨论氢还原过程中还原温度和还原时间对还原产物物相、粒径及形貌的影响。结果表明,在液相沉淀中,随着搅拌时间的延长和反应温度的升高,CoCO_(3)前驱体形核率提高,CoCO_(3)平均粒径D50减小;在搅拌时间45 min、反应温度25℃条件下,制备出粒径均匀、球形度高、平均粒径D50为0.96μm的CoCO_(3)前驱体。在氢还原制备钴粉过程中,随着氢还原时间的延长和温度的升高,钴粉粒径变大;当氢还原温度为400℃、时间为45 min时,钴粉分散性好,粒径均匀,平均粒径为0.4μm。The CoCO_(3)precursors with fine,uniform,and controllable particle size were prepared by liquid-phase precipitation method,using CoCl_(2)·6H_(2)O and NH_(4)HCO_(3)as raw materials,and then the ultrafine spherical cobalt powders were prepared by calcination-hydrogen reduction.The influence of stirring time and reaction temperature on the particle size and morphology of CoCO_(3)precursors in the liquid-phase precipitation method was analyzed,and the effect of reduction temperature and reduction time on the phase,particle size,and microstructure of the reduction products was investigated.The results show that the nucleation rate of CoCO_(3)precursors increases with the increase of stirring time and reaction temperature,and then the average particle size of CoCO_(3)decreases.The CoCO_(3)precursors with uniform particle size,high sphericity,and average particle size of 0.96μm are prepared,when the stirring time is 45 min and the reaction temperature is 25℃.In the hydrogen reduction,the particle size of cobalt powders increases with the increase of hydrogen reduction time and temperature.When the hydrogen reduction temperature is 400℃for 45 min,the cobalt powders show the good dispersion and uniform particle size with the average particle size of 0.4μm.

关 键 词：液相沉淀法 碳酸钴前驱体 氢还原 类球形钴粉 粒径 形貌 

分 类 号：TF123.2[冶金工程—粉末冶金]