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.
[1] 王鑫,方建华,刘坪,等.相变材料的研究进展[J].功能材料,2019,50(2):2070-2075.
[2] 何媚质,杨鲁伟,张振涛,等.纳米材料/十四酸混合相变蓄热材料的制备与特性[J].化工学报,2018,69(9):4097-4105.
[3] 王俊霞,王军,黄崇杏,等.导热增强型纳米/微米复合相变蓄热材料的制备及性能研究[J].化工新型材料,2019,47(9):82-85.
[4] 王博,朱孝钦,胡劲,等.利用纳米石墨强化正癸酸-十四醇复合相变材料的导热性能[J].材料导报,2019,33(22):3815-3819.
[5] 黄志锟,张海燕,陈易明,等.碳包铝纳米颗粒/石蜡复合相变导热材料的制备及其热学性能研究[J].材料研究与应用,2016,10(2):100-105.
[6] 高丽媛,杨宾,郝梦琳,等.石蜡基纳米金属复合相变材料热性能的实验研究[J].河北工业大学学报,2019,48(1):51-56.
[7] 华维三,章学来,罗孝学,等.纳米金属/石蜡复合相变蓄热材料的实验研究[J].太阳能学报,2017,38(6):1723-1728.
[8] 徐斌,楼白杨,刘春雷,等.新型纳米铜/石蜡/膨胀石墨温敏复合材料的制备及性能[J].材料研究学报,2012,26(1):101-106.
[9] 陆威,吴永卫.纳米铝粉/石蜡/膨胀石墨复合相变材料的制备及性能研究[J].热能动力工程,2017,32(2):101-105,140-141.
[10] 任学明,沈鸿烈,杨艳.膨胀石墨/石蜡复合相变材料的碳纳米管掺杂改性研究[J].功能材料,2019,50(6):6008-6012.
[11] 王大伟,余荣升,晏华,等.碳纤维/石蜡/膨胀石墨复合相变材料的制备及强化传热研究[J].材料导报,2014,28(24):70-73.
[12] 李果,欧阳婷,蒋朝,等.碳纤维-纳米石墨片网络体导热增强石蜡相变储能复合材料的制备及表征[J].复合材料学报,2020,37(5):1130-1137.
[13] 徐众,万书权,韩洪波,等.天然鳞片石墨制备可膨胀石墨的工艺研究[J].无机盐工业,2016,48(5):30-34.
[14] 汪南,朱冬生,肖松.纳米铜/石蜡复合相变蓄热材料的导热性能研究[J].化工新型材料,2012,40(5):104-106,112.
[15] 朱教群,宋轶,周卫兵,等.基于碳材料的有机复合相变材料导热增强研究进展[J].储能科学与技术,2017,6(2):213-222.