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在脉冲电磁场(PEMF)作用下,采用常规沉淀方法制备了草酸钻(CoC_2O_4·2H_2O)粉体.利用XRD,TG DSC,松装密度仪以及激光粒度仪对产物的物相、热分解过程及粒度进行了表征.并基于PEMF和反应体系内微观粒子之间的相互作用提出了CoC_2O_4·2H_2O粒度改变的机理.实验结果表明,施加及未施加PEMF条件下,以CoCl_2·6H_2O为原料. (NH_4)_2C_2O_4·H_2O为沉淀剂制备的产物均为β-CoC_2O_4·2H_2O;脉冲电压为800 V时,产物松装密度为0.393 g/cm~3,平均粒径为3 5403μm,与未施加PEMF条件下制备的样品相比,分别降低了26.95%和60.13%;以PEMF制备的CoC_2O_4·2H_2O为前躯体,在Ar气氛下加热分解获得了fcc结构的金属Co粉.
Cobalt oxalate (CoC_2O_4 · 2H_2O) powder was prepared by the conventional precipitation method under the action of pulsed electromagnetic field (PEMF). The phase, thermal decomposition and particle size of the product were characterized by XRD, TG DSC, The mechanism of CoC_2O_4 · 2H_2O particle size change was put forward based on the interaction between PEMF and the microscopic particles in the reaction system.The experimental results showed that CoCl_2 · 6H_2O was the main raw material with or without PEMF (NH_4) _2C_2O_4 · H_2O as precipitating agents were all β-CoC_2O_4 · 2H_2O. When the pulse voltage was 800 V, the product bulk density was 0.393 g / cm ~ 3 and the average particle size was 35403 μm. Compared with the preparation without PEMF , Respectively. The CoC_2O_4 · 2H_2O prepared from PEMF was used as a precursor, and the metal Co powder with fcc structure was obtained by pyrolysis under Ar atmosphere.