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摘要
相变材料在热能储存和热管理方面表现出了良好的应用前景,为了解决石蜡相变材料的低导热问题,以石蜡(PW)为基体,碳纤维(CF)和膨胀石墨(EG)为强化导热添加剂,采用熔融共混法制备了EG-CF/PW三元复合相变材料。研究PW在固定含量为60%和85%下,不同CF与EG添加比例对复合相变材料潜热值、过冷度及导热系数的影响。结果表明:当EG-CF/PW三元复合相变材料中CF∶EG为20%∶20%时,复合相变材料导热系数的最大值为1.259W/(m·K),是CF40-PW60二元复合相变材料导热系数的1.699倍,PW的6.295倍;当PW含量为60%时,在CF-PW二元复合相变材料中通过改变CF含量并添加EG导热添加剂,可保证潜热值变化很小的前提下,大幅度提高复合相变材料导热系数并降低其过冷度,PW很好地被吸附在EG表面及孔隙上,CF与EG相互交错形成有效的面接触,传热性能更佳。
Abstract
Phase change materials (PCMs) have shown good application prospects in thermal energy storage and thermal management.In order to solve the problem of low thermal conductivity of paraffin phase change,EG-CF/PW composite PCMs was prepared by melt-mixing with paraffin wax (PW) as matrix,carbon fiber (CF) and expanded graphite (EG) as thermal conductivity additives.The effect of different CF and EG content on the latent heat value,undercooling degree and thermal conductivity of the PCMs was studied under the fixed content of 60% and 85% of PW.The results shown that the maximum thermal conductivity of EG-CF/PW was 1.259W/(m·K) when CF∶EG was 20%∶20%,which was 1.699 times of the thermal conductivity of CF40-PW60 binary material and 6.295 times of PW.When the content of PW was 60%,the thermal conductivity coefficient of CF-PW binary composites can be greatly improved and the undercooling degree can be reduced by changing the content of CF and adding EG thermal conductivity additive in the CF-PW composites under the premise that the latent heat value changed little,PW was well adsorbed on the surface and pores of EG,and CF and EG were interlaced to form an effective surface contact with better heat transfer performance.
关键词
复合相变材料
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制备
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潜热值
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过冷度
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导热系数
Key words
phase change composite material
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preparation
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latent heat value
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undercooling degree
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thermal conductivity
EG-CF/PW三元复合相变材料的制备及热特性分析[J].
化工新型材料, 2022, 50(5): 146-150 DOI:10.19817/j.cnki.issn1006-3536.2022.05.030
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基金资助
湖南省自然科学基金省市联合项目(14JJ5014);中山市社会公益科技研究项目(2020B2028);中南林业科技大学研究生科技创新基金(CX202102039)
