十八烷-棕榈酸/膨胀石墨相变储能材料的制备与性能

Preparation and Properties of Octadecane-Palmitic Acid/Expanded Graphite Phase Change Energy Storage Materials

以十八烷和棕榈酸的低共熔物作相变材料,膨胀石墨为基体,采用真空浸渗方法,制备出十八烷-棕榈酸/膨胀石墨相变储能材料。由于膨胀石墨的多孔结构,其毛细作用力和表面张力使得相变材料在发生固液相变的过程中,失去了流动性。采用DSC,ESEM、熔化凝固过程分析对相变储能材料进行了结构和热性能研究。结果表明,癸酸-月桂酸被有效地包封在多孔石墨孔内,膨胀石墨作为基体材料,较大的提高了相变材料的导热率,同时该储能材料还具有较高的相变潜热和较好的热稳定性,可被应用于储能和热能回收系统中。

Octadecane-palmitic acid/expanded graphite phase change energy storage materials were prepared by vacuum infiltration method using the eutectic mixture of octadecane（OC） and palmitic acid（PA） as phase change materials,expanded graphite（EP） as skeleton.In such a composite,expanded graphite has porous structure,which prevents leakage of the melted phase change materials because of the effect of capillary force and surface tension force.The structure and properties of the materials were analysised by SEM,DSC and the test of melting and solidification process.The results show that phase change materials are well sealed into the inner pore of porous graphite,and the composite with expanded graphite skeleton has high thermal conductivity,high latent heat and steady thermal performce,so it can be used in thermal energy storage and heat recovery system.