石蜡/膨胀石墨定形相变材料的性能

以石蜡为相变材料,利用膨胀石墨多孔网络结构,通过物理吸附法制备出石蜡/膨胀石墨复合相变材料,并通过模压法制成定形相变材料板块。采用差示扫描量热分析仪(DSC)、扫描电子显微镜(SEM)、偏光显微镜(POM)和Hot Disk 热常数分析仪等对复合相变材料进行了结构和性能的表征与测量,建立了冷/热循环实验系统以分析材料的蓄/放热性能等。结果表明:石蜡质量分数为80%的定形相变材料相变温度为27.27℃,相变焓为156.6 kJ·kg^-1。制备的定形相变材料具有相变过程形状稳定、热导率高、储热密度大等特点,并具有良好的稳定性和较长的使用寿命。

Performance of paraffin/expanded graphite composite phase change materials

With paraffin as phase change material(PCM) and expanded graphite with network structure as matrix,a composite phase change material was prepared through physical adsorption,and was compressed to a shape-stabilized cylinder block by the compacting tool set.The prepared composite phase change material was characterized with differential scanning calorimeter(DSC),scanning electron microscope(SEM),polarizing optical microscope(POM)and Hot Disk thermal analyzer.In addition,an experimental system was set up to measure its thermal cycling performance.The results showed that melting temperature of the shape-stabilized phase change material with 80% mass fraction of paraffin was 27.27℃ and its phase transition enthalpy was 156.6 kJ·kg^-1.The prepared shape-stabilized phase change material had many advantages over pure paraffin,such as a form-stable phase change process,higher thermal conductivity and heat storage capacity,excellent thermal stability and a longer service life.