本文以十二烷为相变材料,利用膨胀石墨多孔吸附特性制备出十二烷/膨胀石墨复合相变蓄冷材料.通过扫描电镜(SEM)、差示扫描量热仪(DSC)和热常数分析仪(HotDisk)对复合相变材料的结构及热性能进行了表征.实验结果表明,十二烷被膨胀石墨均匀吸附,吸附后膨胀石墨保持了原来的疏松多孔的蠕虫状形态.复合相变材料的相变焓值随着添加的膨胀石墨质量分数增加而降低,导热系数随着添加的膨胀石墨质量分数增加而增加.相变材料质量分数为80％,复合相变材料熔化焓和凝固焓分别为132.8 J/g和132.5 J/g,表观密度为700 kg/m3时,导热系数为2.64 W/(m.K).复合相变材料具有良好的热循环稳定性能.
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