喷雾干燥前驱体纳米Al悬浮液的制备及分散稳定性

Preparation and Dispersion Stability of Spray-drying Precursor Nano-Al Suspension

为制备具有良好分散稳定性的喷雾干燥前驱体纳米Al悬浮液,采用机械搅拌和超声分散两种分散方法制备了纳米Al悬浮液,研究了纳米Al粉在主炸药黑索今(RDX)溶液中的分散稳定性。利用紫外可见分光光度计研究了分散速度、分散时间、超声时间、悬浮液质量浓度、分散温度、纳米铝粉的粒径等对悬浮液分散稳定性的影响,采用扫描电子显微镜(SEM)分析了喷雾干燥后样品的形貌。结果表明:选择粒径为50~100 nm的铝粉,当分散速度为400 r·min^-1,分散时间为30 min,超声时间为3~10 min,悬浮液质量浓度为1%,分散温度为25℃时,悬浮液的吸光度值最大,分散稳定性达到最佳。

To prepare spray-drying precursor nano-Al suspension with good dispersion stability,nano-Al suspension was prepared by mechanical stirring and ultrasonic dispersion,and the dispersion stability of nano-Al in RDX solution was investigated.Based on the measurement of ultraviolet spectrophotometer,the effects of dispersion rate,dispersion time,ultrosonic time,temperature and nano-Al particle size were systematically studied. The microphology structure of spray-drying samples were analyzed by scanning electron microscopy. The results showed that the aluminum powders with particle size of 50-100 nm,the best dispersion stability was achieved at the following conditions:stirring rate of 400 r·min^-1,dispersion time of 30 min,ultrasonic time of 3-10 min,suspension concentration of 1%,temperature of 25 ℃.