碳纳米管对泡沫铜/石蜡复合相变材料热性能的影响

Effect of carbon nanotube on thermal properties of copper foam/paraffin composite phase change materials

以泡沫铜(copper foam, CF)、碳纳米管(carbon nanotubes, CNT)和石蜡为原料,分别制备CF/混合CNT/石蜡和CF/催化CNT/石蜡两种复合相变材料(phase change material, PCM),CNT与石蜡的质量比均为1:99。采用SEM和Raman光谱表征材料的形貌和品质,用激光导热测试仪和差示扫描量热仪表征复合PCM的传热性能和相变行为。结果表明,所有PCM复合情况良好,且引入2种不同形式的CNT均能提高石蜡的热导率。虽然混合CNT的品质比催化CNT更好,但与CF/混合CNT/石蜡复合材料的热导率(3.28 W/(m·K))相比,CF/催化CNT/石蜡复合材料的热导率仍达到3.94 W/(m·K)。此外,两种形式的CNT均能有效改善石蜡的相变潜热和过冷度。

Copper foam(CF),carbon nanotubes(CNT)and paraffin were used to prepare CF/mixed CNT/paraffin and CF/catalyzed CNT/paraffin composite phase change materials(PCM).The mass ratio of CNT and paraffin was 1:99.SEM and Raman spectra were used to characterize the morphology and quality of the samples.The thermal conductivity and phase change behavior of phase change materials were measured by laser thermal conductivity tester and differential scanning calorimeter.The results show that the composite PCM is well compounded,and the thermal conductivity of paraffin can be improved by introducing two kinds of CNT.Even though the quality of mixed CNT is better than that of catalytic CNT,compared with the thermal conductivity of CF/mixed CNT/paraffin composite(3.28 W/(m·K)),the thermal conductivity of CF/catalytic CNT/paraffin sample increases to 3.94 W/(m·K).In addition,two kinds of CNT can effectively improve the influence of supercooling degree and shape stability of the paraffin.