【摘要】 采用还原反应制备了约15nm的钴硼(CoB)金属粉,为了防止纳米金属粉在空气中被氧化,通过化学置换反应制备了银包纳米CoB(Ag-CoB)的纳米核壳金属粉,其形貌与组成分别通过电子透射显微镜(TEM)与X射线衍射(XRD)进行表征。对纳米金属粉(Ag-CoB)与未包银的CoB金属粉的抗氧化性通过热重分析进行了对比,另外,利用差热分析对两种金属粉对高氯酸铵(AP)的催化热分解作用进行了比较。结果表明:(Ag-CoB)金属粉的抗氧化效果好;纳米CoB金属粉和包银后的Ag-CoB金属粉对AP的催化效果都较好,经过包银后的Ag-CoB金属粉对AP的催化效果明显好于未包银的金属粉,达到了包覆的目的。更多还原

【Abstract】 The CoB nano metal powders with particle size of about 15 nm were prepared by chemical reduction method in aqueous solutions. In order to prevent being oxidized, nano core-shell Ag-CoB bimetallic powders were prepared by substitutional reaction method. The particle size and crystalstructure of these samples were observed and characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Oxidation resistance property of the two kinds of powders was studied by adopting Thermogravimetry (TG) analysis. The result shows that the oxidation resistance effect of Ag coating CoB (Ag-CoB) metal powders is better than that of uncoated CoB powder. In addition, the catalytic performance of metal nanopowder by the decomposition of ammonium perchlorate (AP) has been investigated by differential thermal analysis (DTA). The results indicate that the nano Ag-CoB metal powders by the decomposition of AP has better catalytic activity than the CoB nanoparticles, and the coating aim has been attained.更多还原