采用超声振荡的方法制备稳定性良好的多壁碳纳米管冷冻机油。在不同温度(20～80℃)下，利用密度计和热导率测试系统对不同浓度的多壁碳纳米管冷冻机油（MWCNTs的质量分数为0.5%、1.0%、1.5%、2.0%）进行测试和分析。实验结果表明：冷冻机油的密度随MWCNTs质量分数的增加而增大，随温度的升高而减小；冷冻机油的热导率随MWCNTs质量分数的增大而增大，随温度的升高而增大，其中，热导率增大的效果随质量分数增加较随温度升高更为明显。当多壁碳纳米管质量分数为2%、温度为80℃时，纳米冷冻机油的热导率可达到0.1637W/(m·K)，较同温度下纯RL68H冷冻机油热导率增大9.13%。%Multiwalled carbon nanotube nano-oil with good stability were prepared by ultrasonic vibration methods. Under different temperatures (20—80℃),density and thermal conductivity of the multiwalled carbon nanotube nano-oil (MWCNTs mass fraction were 0.5%,1.0%,1.5%,2.0%) were investigated experimentally by using density meter and the thermal conductivity test system. The experimental results show that the density of the multiwalled carbon nanotube nano-oil increases with an increase of nanoparticles mass fractions,and decreases as temperature,while the thermal conductivity increases with nanoparticles mass fractions and temperature. Among them,the effect of the thermal conductivity increasing with mass fraction is more apparent than that with temperature. When the mass fraction of multi-walled carbon nanotubes is 2% and temperature is 80℃,the thermal conductivity of MWCNTs nano-oil could reach 0.1637W/(m·K),increased by 9.13% compared with that of pure RL68H under the same temperature.
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