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材料研究学报  2016, Vol. 30 Issue (7): 545-552    DOI: 10.11901/1005.3093.2015.586
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膨胀石墨基复合相变材料的结构与性能研究
李云涛, 晏华(), 汪宏涛, 余荣升
后勤工程学院化学与材料工程系 重庆 401311
Characterization of Microstructure and Property for Phase Change Materials of Expanded Graphite Matrix Composite
LI Yuntao, YAN Hua*(), WANG Hongtao, YU Rongsheng
(Department of Chemistry and Material Engineering, Logistic Engineering University, Chongqing 401311, China)
引用本文:

李云涛, 晏华, 汪宏涛, 余荣升. 膨胀石墨基复合相变材料的结构与性能研究[J]. 材料研究学报, 2016, 30(7): 545-552.
Yuntao LI, Hua YAN, Hongtao WANG, Rongsheng YU. Characterization of Microstructure and Property for Phase Change Materials of Expanded Graphite Matrix Composite[J]. Chinese Journal of Materials Research, 2016, 30(7): 545-552.

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摘要: 

以膨胀石墨(EG)为载体, 石蜡为相变材料, 利用EG对石蜡良好的吸附性, 制备了膨胀石墨基复合相变材料。采用扫描电镜、差示扫描量热仪、RC-4温度记录仪、傅里叶红外光谱仪、X射线衍射分析仪对复合相变材料的结构与性能进行了测试和表征。实验结果表明, 复合相变材料是EG和石蜡的物理结合, 随着EG含量的增加, 复合相变材料的相变潜热和相变温度降低, 但分散性提高, 稳定性增强, 导热性能增加; 同时, 蓄热时间缩短, 效率增加, 且蓄热过程中温度对复合相变材料相变时间影响明显; 综合分析, 要保证复合相变材料结构稳定和性能优良, EG的质量分数应控制在10%左右。

关键词 复合材料石蜡膨胀石墨复合相变材料结构性能    
Abstract

Composite phase change materials were synthesized with expanded graphite (EG) as carrier and paraffin as phase change component. The microstructure and properties of the composite phase change materials were characterized by means of scanning electron microscopy, differential scanning calorimetry, RC-4 temperature recorder, Fourier infrared spectrometer and X- ray diffraction analyzer.Results confirm that the composite phase change material is a combination of EG and paraffin.With the increase of EG content, the latent heat and phase change temperature of composite phase change materials decreased, however their dispersibility, stability and thermal conductivity increased, whilst they showed enhanced efficiency with shorten heat storage time; The temperature of the heat storage process has obvious effect on the transformation time of the composite phase change materials; Therefore, in order to ensure the composite phase change materials with appropriate microstructure and good performance, the fraction of EG should be controlled around 10%.

Key wordscomposite    paraffin    expanded graphite    composite phase change material    microstructure    properties
收稿日期: 2015-10-18     
作者简介: null

本文联系人: 晏 华, 教授

图1  EG、复合相变材料的SEM像
图2  石蜡及复合相变材料的宏观形态
图3  复合相变材料的DSC曲线及相变潜热和相变温度的变化曲线
图4  复合相变材料的红外光谱图
图5  EG、石蜡、复合相变材料的XRD图谱
图6  复合相变材料的导热系数曲线及导热系数测试示意图
图7  复合相变材料蓄热能力曲线图
No. C1 C2 C3 C4 C5
50℃ 3530 730 300 200 180
60℃ 1860 480 260 150 140
70℃ 1390 420 280 170 160
80℃ 690 280 150 110 100
表1  不同复合相变材料在不同温度下达到45℃的时间
图8  温度与EG含量对复合相变材料相变时间的影响
图9  复合相变材料中石蜡浸出示意图及EG含量对浸出系数的影响
图10  冷热循环对复合相变材料相变潜热的影响
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