碳纤维-纳米石墨片网络体导热增强石蜡相变储能复合材料的制备及表征  

Preparation and characterization of paraffin phase change composites reinforced by carbon fiber-graphite nanoplatelets network

作　　者：李果 欧阳婷[1] 蒋朝[1] 陈云博 LI Guo;OUYANG Ting;JIANG Zhao;CHEN YunBo(College of Materials Science and Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学材料科学与工程学院,长沙410082

出　　处：《复合材料学报》2020年第5期1130-1137,共8页Acta Materiae Compositae Sinica

基　　金：湖南省自然科学基金(2018JJ3044)。

摘　　要：以石蜡为代表的固-液相变储能材料存在导热率低和热稳定性差两大问题,为了提高其导热性能,以酚醛树脂为碳质黏结剂前驱体,采用浆料成型法制备碳纤维-纳米石墨片(CF-GNP)复合网络体,并通过真空浸渍石蜡,制得CF-GNP/石蜡复合材料。表征和分析了CF和GNP含量对CF-GNP网络体微观形貌和CFGNP/石蜡相变储能复合材料导热效率及热稳定性的影响。结果表明,CF-GNP/石蜡复合材料的导热效率较纯石蜡大幅增加。CF-GNP网络体中CF含量越低,GNP导热增强效应越明显。CF-GNP网络体中CF和GNP含量分别为50wt%、10wt%时,CF-GNP/石蜡复合材料的升温时间较CF含量为50wt%的CF/石蜡复合材料缩短了39.9%,当CF含量分别为70wt%和85wt%时,分别缩短了24.5%和9.4%。40次热循环稳定性测试表明,CF-GNP/石蜡复合材料具有良好热稳定性。Two main drawbacks of most phase change materials are the low thermal conductivity and thermal stability. To address the above-mentioned problems, carbon bonded carbon fiber-graphite nanoplatelets(CF-GNP)network was first prepared using a slurry molding method. And molten paraffin was infiltrated into the CF-GNP network to form a CF-GNP/paraffin phase change composites. The effects of CF and GNP contents on the structure of the CF-GNP network and thermal properties of the CF-GNP/paraffin composites were systematically studied. The results show that the melting-solidifying rates are greatly accelerated for the CF-GNP/paraffin composites comparing to pure paraffin. The less the CF loading amount is, the more the effect of GNP on heat enhancement is. For the CF-GNP/paraffin composites with 50 wt% CF and 10 wt% GNP in the CF-GNP network, the melting time is shortened by 39.9% comparing with the CF/paraffin composite with only 50 wt% CF in network. The decrements are 24.5% and9.4% for CF/paraffin composite with CF loading of 70 wt% and 85 wt%, respectively. The tests of 40 thermal cycles indicate that the CF-GNP/paraffin composites prepared in this study show good thermal stability.

关 键 词：碳纤维 纳米石墨片 高导热性 相变复合材料 热稳定性 

分 类 号：TB332[一般工业技术—材料科学与工程]