为获取相变温度、潜热和导热性都比较合适的相变材料，本文使用高熔点的固态石蜡（熔点为70 ℃）和低熔点的液态石蜡（熔点为5 ℃）按照不同比例进行配比实验，来获得不同相变范围的相变材料，以适应实际应用的要求。制备了五种复合相变材料样品，使用差式扫描量热仪（DSC）测试其参数。并选用孔隙率均为95%，孔隙密度（pores per inch,ppi）分别为15，30和50 ppi的三种泡沫铜，采用熔融浸渍法将石蜡填充其中制备复合相变材料，进而探究泡沫铜对石蜡强化换热的效果。实验结果显示比例为A1(20%5 ℃+80%70 ℃)、A2（35%5 ℃+60%70 ℃）和A5（80%5 ℃+20%35 ℃）时只有一个熔化峰，其起始点分别为56.6 ℃，53.2 ℃和3.7 ℃，表明通过物理方法将两种石蜡混合可以调控复合相变材料的熔点与潜热。热导率测试结果表明当孔隙率为95%孔隙密度分别为15，30和50 ppi时泡沫铜可以提高石蜡导热率3-7倍。

In order to obtain phase change materials with suitable phase change temperature, latent heat and thermal conductivity, solid paraffin with high melting point(70 ℃) and liquid paraffin with low melting point(5 ℃) were used according to different ratios to obtain phase change materials with different phase change ranges to meet the requirements of practical applications. Five samples of composite phase change materials were prepared and their parameters were tested by differential scanning calorimetry(DSC).Three types of foamy coppers with a porosity of 95% and a pore density of 15, 30 and 50 ppi were selected. The composite phase change material was prepared by filling paraffin wax with melt dipping method to explore the effect of foamy coppers on the enhanced heat transfer of paraffin.The experimental results show that there is only one melting peak when the ratio is A1(20%5 ℃+80%70 ℃), A2(35%5 ℃+60%70 ℃) and A5 (80%5 ℃+20%35 ℃).The starting points are 56.6 ℃, 53.2 ℃ and 3.7 ℃, respectively, which indicated that mixing the two paraffin by physical methods can control the melting point and latent heat of the composite phase change material. The thermal conductivity test results show that when the porosity is 95% and the pore density is 15,30 and 50 ppi, the foamy copper can increase the thermal conductivity of paraffin by 3-7 times.

TK124

国家自然科学基金(51976126)；上海市青年东方学者项目，上海市地方高校能力建设项目（18060502600）