Shape-controlled synthesis of novel precursor for fibrous Ni-Co alloy powders  

形貌控制法合成一种新型的纤维状镍钴合金粉末前驱体(英文)

作　　者：湛菁[1,2] 周涤非[1] 张传福[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083 [2]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第3期544-551,共8页中国有色金属学报（英文版）

基　　金：Project (20090162120080) supported by Doctoral Fund of Ministry of Education, China;Project (20070410989) supported by China Postdoctoral Science Foundation;Project(748310000) supported by Central South University Science Foundation for Youths, China

摘　　要：A novel precursor of nickel-cobalt alloy powders with an appropriate Ni to Co molar ratio was prepared under selectively synthetic conditions. The composition and morphology of the precursor were characterized by X-ray diffractometry （XRD）, scanning electron microscopy （SEM）, Fourier transform infrared spectrometry （FT-IR） and energy dispersive spectrometry （EDS）. The effects of pH value, reaction temperature, metal ion concentrations and surfactant on the morphology and the dispersion of precursor were investigated. The results show that the morphology of precursor depends on ammonia content in the precursor. A fibriform precursor is a complicated ammonia-containing nickel-cobalt oxalate. The uniform shape-controlled fibrous precursor is obtained under the following optimum conditions： ammonia as complex agent as well as pH adjustor, oxalate as coprecipitator, 50-65 °C of reaction temperature, 0.5-0.8 mol/L of total concentration of Ni2＋ and Co2＋, PVP as dispersant, and pH 8.0-8.4.通过选择性控制合成条件,制备一种新型的纤维状镍钴合金粉末前驱体。该前驱体中镍、钴摩尔配比精确。采用X-射线衍射仪(XRD)、扫描电镜(SEM)、红外光谱(FT-IR)和能谱(EDS)研究前驱体粉末的成分与形貌;考察溶液pH值、反应温度、金属离子浓度和表面活性剂对前驱体粉末的形貌和分散性的影响。结果表明:前驱体的形貌取决于前驱体中氨的含量,这种纤维状前驱体为一种复杂的含氨草酸镍钴复盐。形貌控制合成纤维状镍钴合金粉末前驱体的最佳条件为:氨作为配位剂和pH值调节剂,草酸为沉淀剂,反应温度为50～65°C,镍、钴离子总浓度为0.5～0.8mol/L,PVP为分散剂,溶液pH值控制在8.0～8.4.

关 键 词：fibrous precursor Ni-Co alloy powder shape-controlled synthesis composition control growth mechanism 

分 类 号：TF124[冶金工程—粉末冶金]