石蜡基碳纳米管复合相变材料热性能的研究

Thermophysical property of paraffin-carbon nanotubes composite phase transition material

针对石蜡作为相变材料的改进研究,将多壁碳纳米管(CNTs)作为导热增强剂增加石蜡的导热系数。实验制备了CNTs用量为0.02%(wt,质量分数,下同)、0.05%和0.1%的石蜡/CNTs复合相变材料,通过差示扫描量热仪及导热系数仪分别对复合材料的相变特性和导热系数进行表征和测量。实验结果表明,复合材料导热系数随着CNTs用量的增加而提高,相变焓先增加后减小,CNTs用量为0.1%时,相变焓为152.8~157.9kJ/kg,较纯石蜡有所降低但变化不大,导热系数为0.487W/m·K(固态)和0.262W/m·K(液态),较纯石蜡分别提高21.14%和29.06%,稳定性较好,展现了良好的导热性能。

Research for the improvement of paraffin as phase transition material.Multi-walled carbon nanotubes（CNTs）was used as an enhancer of thermal conductivity,increased the coefficient of thermal conductivity of paraffin.Dosage of CNTs was 0.02%（wt,mass fraction）,0.05% and 0.1%in paraffin/CNTs composite.Phase transition temperature and enthalpy and coefficient of thermal conductivity of materials were measured by differential scanning calorimeter and thermal conductivity instrument.The result showed that with the increasing of mass fraction of CNTs,thermal conductivity became larger and phase transition enthalpy increased firstly and then decreased.When the dosage of CNTs was 0.1%,phase transition enthalpy was 152.8~157.9kJ/kg,which was decreased but haven＇t changed much compared with the pure paraffin.Thermal conductivity was 0.487W/m·K（solid）and 0.262W/m·K（liquid）,increased 21.14% and 29.06% than pure paraffin,had a good heat-conducting property and stability.