以不同膨胀石墨(EG-300、EG-350和EG-400)为支撑材料,石蜡(PW)为相变主材,提钒尾渣(VT)为导热强化剂,采用熔融共混法制备复合相变材料,并对复合材料的导热性能进行测试分析。结果表明:在PW当中分别添加9%、8%和7%的3种膨胀石墨时,PW不会泄漏;分别在3种复合相变材料中添加1%～3%的微米级VT,得到9种VT/EG/PW复合相变材料,在4MPa下压制成型,进行60次热循环;添加VT之后,复合材料在不同温度下热导率多数变大,而60次热循环之后的热导率损失率多数变小,添加微米级VT可以增强复合材料的导热性能,减缓热导率衰减。说明在EG/PW复合相变材料当中添加一定量的微米级VT可以增强材料的导热性能。

Paraffin (PW) were used as the main phase change materials,different expanded graphites (EG-300,EG-350 and EG-400) for the framework,and vanadium tailings (VT) as thermal conductivity enhancing agents.All composite phase change materials were prepared by melt-blending method,and the thermal conductivity were tested and analyzed.The results shown that the PW,adding three expanded graphite with the mass fraction of 9%,8% and 7%,had no leakage occurred.Nine VT/EG/PW were prepared by adding 1% to 3% of micron-level VT into 3 types of composite phase change materials,respectively.All VT/EG/PW material was press-molded at 4MPa,and subjected to 60 thermal cycles.Addition of VT had little effect on the thermal stability of the material.the thermal conductivity of the composite at different temperatures mostly increased,and the thermal conductivity loss rate after 60 energy storage/release cycles mostly decreased.Adding micron-level VT can enhance the composite's thermal conductivity,and slowed down the thermal conductivity decay.It shown that adding a certain amount of micron-level VT to the EG/PW composite can enhance the thermal conductivity.