石墨泡沫/共晶盐复合相变材料制备

选择KNO3/NaNO3二元体系按照质量比4∶6制备共晶盐，对共晶盐进行了熔点及熔化潜热的测量；将石墨泡沫这一新型材料作为强化基体，共晶盐作为相变材料（PCM），采用熔融浸渗法制备了适用于太阳能热发电系统储能装置的石墨泡沫/共晶盐复合相变材料。采用扫描电镜对复合相变材料表面的微观结构进行了表征，并对其熔点、潜热、等效导热系数等热物性参数进行了测试。结果表明：共晶盐与石墨泡沫复合效果比较理想；复合前后共晶盐的熔点和潜热几乎没有发生变化；复合相变材料的等效导热系数得到了显著提升，石墨泡沫对相变材料起到了导热强化作用，满足高温蓄热的要求。

Preparation of Graphite Foam/Eutectic Salt Composite Phase Change Materials

Eutectic salt (KNO3/NaNO3) with the mass ratio of 4:6 was firstly prepared then the melting point and latent heat of eutectic salt were obtained by experiments. Next, graphite foam/eutectic salt composite PCM was fabricated successfully by melting impregnation method. In this material, graphite foam and eutectic salt were treated as strengthening matrix and PCM respectively. This kind of composite PCM was suitable for energy storage device in solar thermal power generation system. The microstructure of the composite phase change material was characterized with scanning electron microscopy. The thermo-physical properties of composite PCM including melting point, latent heat and effective thermal conductivity were acquired by DSC test and laser flash technique. The results showed that: the composite effect of eutectic salt and graphite foam was ideal. The melting point of the eutectic salt and latent heat did not change after the impregnation. Composite PCM with high effective thermal conductivity, completely meet the requirements of high temperature heat storage.