氢还原法制备超细钴粉  

Preparation of Ultrafine Cobalt Powder by Hydrogen Reduction

作　　者：昝林寒[1,2] 杨滨[1] 汪云华[2] 赵家春[2] 范兴祥[2] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]昆明贵金属研究所,云南昆明650106

出　　处：《材料科学与工程学报》2010年第4期571-575,共5页Journal of Materials Science and Engineering

基　　金：昆明理工大学分析测试基金资助项目(2007-04)

摘　　要：采用CoSO4加过量NaOH制取的Co(OH)2浆液,在低氢气分压(1MPa)下,水热氢还原法制得了平均粒度120nm,纯度96%的类球形超细钴粉。并对超细钴粉进行二次高温(700℃)氢还原,粒径只长大到200nm左右,纯度高达99.68%。通过控制二次还原温度可以得到密排六方(hcp)、面心立方(fcc)两种结构的钴粉。对Co(OH)2浆体氢还原的机理进行了初步探索。Sphere-like ultrafine cobalt powder with an average particle size of 120 nm,96% purity was prepared by hydrogen reduction from Co（OH）_2 slurry at a low partial pressure of H_2（1MPa）.Then,the ultrafine cobalt powder was reduced secondarily at 700℃,the particle size grew up to 200nm,the purity of ultrafine cobalt powder could reach to 99.68%.Hexagonal close-packed（hcp） or face-centered cube（fcc） Co powder was prepared by controlling reaction temperature.And a primary discussion was made on hydrogen reduction of the Co（OH）_2 slurry.

关 键 词：氢还原 CO(OH)2 超细钴粉 

分 类 号：TQ031.6[化学工程]