太阳能吸收AAO复合氧化膜的制备与性能

摘要

The highly ordered porous anodic alumina was prepared by anodic oxidation technology,after being treated by AC phosphoric pore broadening,the Cu-Ni nano composite particles were deposited into anodic alumina pores by AC frequency with 50Hz in different voltages,different time and different temperatures.The spectra result shows that the coating prepared under the conditions of voltage is 12V,time is 600s,temperature is 25℃ has good solar absorption performance,the absorptivity is 0.91,emissivity is 0.18,quality factor is 4.9.The SEM and XRD analysis show that CuAl2O4/CuNi composite nanorods were deposited on the surface of the composite oxide coating.After heat treatment at 600℃,the solar absorption and infrared emission of target coating have a small fluctuation and the thermal stability of the coating system is greatly improved.The existing of CuAl2O4 limits the diffusion of metal particles under high temperature environment at the interface,which prevents the Cu/Ni from being oxidized.%通过阳极氧化技术制备高度有序的多孔阳极氧化铝(AAO),交流扩孔后,在不同条件下向氧化铝孔内以50Hz的交流频率沉积Cu-Ni纳米复合粒子.经光谱测试分析可知:在电压12V、时间600s、温度25℃条件下制备的涂层具有良好的太阳光吸收性能,吸收率为0.91、发射率为0.18、品质因子为4.9.经SEM,XRD分析可知,复合氧化膜涂层表面得到CuAl2O4/Cu-Ni复合纳米棒阵列.目标涂层经600℃高温处理后,吸收率、发射率波动很小,涂层体系的热稳定性得到提高.其中,CuAl2O4的存在限制高温环境下Cu,Ni金属颗粒在界面处的扩散,减小氧化概率.