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.
Key words
octadecane /
palmitic acid /
expanded graphite /
phase change
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