高频等离子体超声喷雾热解法制备CuO/Al_2O_3粉体

Preparation of CuO/Al_2O_3 Powders by Ultrasonic Spray Pyrolysis Method in High-Frequency Plasma

以硝酸盐水溶液为原料、高频感耦等离子体为加热源、超声雾化热解的方法制备CuO／Al2O3粉体．研究发现，溶液浓度及等离子体参数条件对粉体初始态的特性有很大影响，浓度越低；粉体越细．纯Al2O3粉为位径在1μm左右的空心球或壳状碎片，CuO粉由无定型海绵体与平均粒度为20nm的超细粒子组成．混合溶液制得的粉体形貌随着Cu／Al原子比的变化而变化，CuO与Al2O3熔点温度相差较大是导致杨体生成微观过程不同的主要原因．

CuO/Al2O3 powders were prepared from aqueous solution by ultrasonic spray pyrolysis in the toil plume region of high-frequency inductively coupled plasma. The morphology of the initial powders varied with the atomic ratio of Cu/Al and the concentration in Cu(NO3)2-Al(NO3)3 solution. Al2O3 powders had spherical internal void structure and some shell fragments. CuO powders composed of a mixture of amorphous and ultrafine crystallite, some tens of nanometres in size. The compound powders of CuO/Al2O3, with Cu/Al atomic ratio 1:1, had a similar morphology to pure CuO powders. The diversity of fusing point between CuO and Al2O3 was the main factor to cause the different micro-processes of powder formation in h.f thermal plasma with a plate power about 1kW.