Preparation of Ag-Al₂O₃ nano structures by combustion method and investigation of photocatalytic activity

In this research, Ag-Al₂O₃ nanostructures have been prepared via combustion synthesis and ammonium acetate and urea have been applied as fuels. The prepared Ag-Al₂O₃ nanostructures were characterized by DTA, XRD, SEM, TEM, and BET spectroscopy. The effect of different ratios of silver to alumina and fuel percentage on morphology and particle size of prepared products were investigated. The results showed that using ammonium acetate fuel led to the production of Ag-γ-Al₂O₃ nanocompounds, while using urea produced Ag-α-Al₂O₃. Also, the photocatalytic activity of Ag-Al₂O₃ nanostructures for Congo red degradation was evaluated by UV-Vis diffuse reflectance spectroscopy. The photocatalytic activity of Ag-Al₂O₃ was examined under UV-Vis irradiation and showed significant photocatalytic efficiency.     

烧结制备Ag-Al电接触材料的组织和性能研究

分别用粉末冶金无压烧结和热压烧结技术制备了Ag-Al电接触材料,并通过场发射扫描电镜(FE-SEM)分析了其显微组织及成分分布,探讨了两种制备工艺及含铝量对Ag-Al电接触材料密度、硬度、电导率和耐压强度的影响。结果表明,热压烧结样品力学、电学性能均优于无压烧结样品,且热压样品随着含铝量增加,硬度、耐压强度升高,电导率下降;耐压强度主要受含铝量影响;烧结方式影响Ag-Al电接触材料显微组织,进而影响电弧侵蚀后Ag-Al电接触材料表面形貌和成分分布。