关键词: 相变材料, 石蜡, 膨胀石墨, 结构, 热性

Abstract:

Composite paraffin /expanded graphite phase-change materials ( PCMs) respectively containing 50% (mass fraction, below the same), 60% , 70% and 80% of paraffin were prepared by using paraffin as a latent hea-tstorage material and expanded graphite as a supporting matrix. The structure and thermal properties of PCMs were then characterized by means of SEM and DSC. It is shown that paraffin can be uniformly absorbed into the pore network of expanded graphite, that expanded graphite remains its vermiform structure in PCMs, that the phasechange temperatures of composite PCMs are similar to that of paraffin, and that the latent heat of composite PCMs is equivalent to the calculated values based on themass fraction of paraffin in the composite materials. Moreover, tested results of heat storage and release indicate that the time o f thermal-energy storage and release of the composite PCM containing 80% of paraffin decreases respectively by 69. 7% and 80. 2% , as compared with that of paraffin.

Key words: phase-change materia, paraffin, expanded graphite, structure, thermal property