机械固相化学反应制备纳米β-Co粉及其反应热力学研究  

Synthesis of Nano-crystalline β-Co by Mechano-Chemical Solid Chemical Reaction and Thermodynamical Research for Reaction

作　　者：邓莹[1,2] 熊翔[1] 张艳华[2] 涂铭旌[2] 李婧[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室湖南长沙410083 [2]重庆文理学院,重庆402160

出　　处：《稀有金属材料与工程》2014年第11期2861-2864,共4页Rare Metal Materials and Engineering

基　　金：重庆市教委科学技术研究项目(KJ121217,KJ121203)

摘　　要：以H2C2O4·2H2O及Co(NO3)2·6H2O为原料,在高速球磨中进行固相化学反应,经洗涤并喷雾干燥获得分布均匀的球形纳米晶前驱物,再经高温分解,制备出目标物。对分解产物进行了XRD/SEM分析。结果表明,产物形貌为球形、平均粒径在100 nm左右的纳米粉体,其晶型为面心立方结构β-Co,同时对制备反应进行了热力学的研究。Pure nano-crystalline Co powders of nearly spherical shape have been produced using a high-energy ball mill. This method has used the mechanical force to crush solid reactant, which increased the BET specific surface area and reaction speed of reactant, and accelerated the nucleation rate. The method includes three steps. Firstly, a precursor of COC2O4 was prepared by the mechano-chemical solid state reaction with H2C2O4.2H2O and Co（NO3）2-6H2O at ambient temperature. Secondly, the precursor COH2C2O4 powders were dispersed by spray-drying to get the spherical precursor. Finally, Co powders were obtained by decomposition of the precursor COH2C2O4 for about 3-3.5 h at 450-500 ℃. The powders were characterized by X-ray diffractometer and scanning electron microscopy. The results show that spherical, cubic structure, 100 nm β-Co powders were synthesized.

关 键 词：面心立方结构β-Co 固相反应 纳米晶 前驱物 

分 类 号：TB383.1[一般工业技术—材料科学与工程]