摘要：以六偏磷酸钠作分散剂,采用吸光度实验来考察分散介质、六偏磷酸钠的用量及超声时间对铝基纳米流体稳定性的影响,并对其分散机理进行初步的探讨。结果表明:当乙二醇和去离子水按照体积比为1∶1时混合液作为分散介质得到的纳米流体的分散稳定性最好。六偏磷酸钠能够有效地分散纳米铝粉颗粒,得到均匀、稳定的铝基纳米流体;当加入六偏磷酸钠的质量浓度为0.5 g/L、超声分散时间为50 min时,分散效果最佳;六偏磷酸钠对纳米铝粉颗粒的稳定分散作用主要是通过颗粒间的静电作用来实现的。

关键词： 纳米流体；铝粉；分散

Abstract： Sodium hexametaphosphate was applied to modify the stability of aluminum-based nano-fluids， and the effects of the dispersion medium， content of sodium hexametaphosphate and ultrasonic time on the dispersive stability of aluminum-based nano-fluids were studied by measuring the absorbance. In addition， the dispersion mechanism was preliminarily discussed. The results showed that the glycol water which the volume ratio of ethylene glycol and deionized water was 1 ∶ 1 used as dispersion medium could obtain the best dispersive stability of aluminum-based nano-fluids. In this dispersion medium， the sodium hexametaphosphate could effectively disperse aluminium nano-particles suspension into a homogeneous and stable system， and that the optimun dispersive condition were that the amount of sodium hexametaphosphate was 0.5 g/L， ultrasonic time was 50 min. The dispersion machanism of nano-aluminium powders with sodium hexametaphos phate was mainly resulted from electrostatic stabilization. 

Keywords：nano-fluids； aluminium powders； dispersion