Co粉制取工艺对粉末松装密度的影响  

Impact of Co Powder Manufacturing Process on Apparent Density of Powder

作　　者：王朝安 董贵有 张志平 任婷 Wang Chaoan;Dong Guiyou;Zhang Zhiping;Ren Ting(Anhui Hanrui New Material Co.,Ltd.,Chuzhou Anhui 239000,China;Nanjing Hanrui Cobalt Co.,Ltd.,Nanjing Jiangsu 211100,China)

机构地区：[1]安徽寒锐新材料有限公司,安徽滁州239000 [2]南京寒锐钴业股份有限公司,江苏南京211100

出　　处：《硬质合金》2023年第5期370-375,共6页Cemented Carbides

摘　　要：以两种不同形貌的碳酸钴为原料,通过氢气还原工艺制得钴粉。采用扫描电子显微镜、激光粒度分析仪、费氏粒度分析仪和松装密度仪表征相应的粉末特征,研究了钴粉制取工艺对粉末松装密度的影响。结果表明:钴粉制取过程中的还原温度、碳酸钴原料的粒度和形貌、钴粉的粒度分布是影响粉末松装密度的直接因素。还原温度越高制得钴粉松装密度越大,碳酸钴原料粒度越大、形貌越接近于球形制得钴粉松装密度越大,费氏粒度1.03μm和5.28μm碳酸钴在620℃下还原制得的钴粉松装密度分别为2.40、2.71 g/cm^(3),均大于400℃还原制得的钴粉;均匀混合粗细不同的钴粉可提高粉末松装密度,将质量分数为20%、费氏粒度1.50μm、松装密度1.45 g/cm^(3)的钴粉和质量分数为80%、费氏粒度5.40μm、松装密度2.71 g/cm^(3)钴粉充分混合,混合后的钴粉松装密度为2.93 g/cm^(3)。This article discussed the production of cobalt powder through the hydrogen reduction process using two different forms of cobalt carbonate as raw materials.The powder characteristics were analyzed using scanning electron microscopy,laser particle size analyzer,Fischer particle size analyzer,and apparent density tester.The influence of the cobalt powder production process on the apparent density of powder was studied.The results show that the reduction temperature during the cobalt powder production process,the particle size and morphology of cobalt carbonate,and the particle size distribution of cobalt powder are direct influencing factors.Higher reduction temperature leads to a higher apparent density of produced cobalt powder.Larger particle size and more spherical morphology of cobalt carbonate result in higher apparent density of produced cobalt powder.The apparent densities of cobalt powder reduced at 620℃ from cobalt carbonate with particle sizes of 1.03μm and 5.28μm are 2.40 g/cm^(³)and 2.71 g/cm^(3),respectively,both higher than the cobalt powder reduced at 400°C.Mixing cobalt powders of different sizes uniformly can improve the apparent density of the powder.When 20%of fine particles with a Fisher size of 1.50μm and apparent density of 1.45 g/cm^(3)are thoroughly mixed with 80%of coarse particles with a Fisher size of 5.40μm and apparent density of 2.71 g/cm^(3).the resulting apparent density is 2.93 g/cm^(3).

关 键 词：钴粉 松装密度 碳酸钴 还原温度 粒度 形貌 粘附和搭桥 空隙 

分 类 号：TF125.212[冶金工程—粉末冶金]