摘要
聚合物基导热材料受限于低的热导率,复合填料多维结构能够在聚合物中形成有效的导热通道。有效利用含氮有机物合成氮化铝(AlN)过程中的残余碳,在催化剂的作用下,采用一步合成工艺原位获得了AlN-石墨管复合材料多维结构,并将该材料作为导热填料应用于石蜡基复合材料中。结果表明,随着煅烧温度的升高,复合材料的结晶性和碳的石墨化程度明显增加。煅烧温度大于1000℃后,原位获得了结晶性良好的AlN和有序的石墨管复合结构,该结构BET比表面积达到161.17 cm^(2)/g,孔隙主要为介孔结构。随着填料含量的增加,AlN-石墨管/石蜡复合材料的热导率线性增加,丰富的孔隙起到明显的抑制泄露的作用。当填充量达到60%时,热导率为0.745 W·m^(-1)·K^(-1),相对于纯石蜡增长了2倍,同时具有良好的形状稳定性。所制备的AlN-石墨管多维复合材料仅能够有效促进复合材料的热量传输,还能维持良好的形状稳定性,在电子材料的热管理方面具有潜在的应用前景。
Polymer-based thermal conductive materials have low thermal conductivity and composite fillers with multi-dimensional structures can form effective thermal conduction pathways within the polymer.This article effectively utilizes the residual carbon from the synthesis process of aluminum nitride(AlN).By the effect of the catalyst,a one-step synthesis process was used to obtain a multidimensional structure of AlN-graphite tube composite material in situ.AlN graphite tube/paraffin composite phase change material was prepared by vacuum impregnating paraffin.The results showed that with the increase in calcination temperature,the crystallinity of the product and the degree of graphitization of carbon increased significantly.Well-crystallized AlN and highly ordered graphite tube composite were obtained in-situ at temperatures higher than 1000℃,with a BET-specific surface area of 161.17 cm^(2)/g and mesoporous pores.As the content of filler increased,the thermal conductivity of the AlN-graphite tube/paraffin composite phase change material increased,and the heat transfer efficiency also improved.The rich pores played a significant role in anti-leakage.The thermal conductivity was 0.745 W/(m·K)when the filling amount reached 60wt%,which was twice as high as that of pure paraffin and had good shape stability.The AlN graphite tube multidimensional composite material synthesized in this article could enhance the thermal conductivity and shape stability of composite phase change materials and had potential application prospects in thermal management.
作者
邓宇强
邹慧娟
张维斌
吴启煌
刘杰聪
程艳玲
左飞
聂光临
林华泰
DENG Yuqiang;ZOU huijuan;ZHANG Weibin;WU qihuang;LIU jiecong;CHENG Yanling;ZUO fei;NIE guanglin;LIN Huatai(Guangdong University of Technology,Guangzhou 510006,China;Guangdong Provincial Key Laboratory of Large Ceramic Plates,Monalisa Group Co.,Ltd.,Foshan 528211,China)
出处
《功能材料》
北大核心
2025年第8期8171-8178,共8页
Journal of Functional Materials
基金
国家自然科学基金(51602064)
粤港澳大湾区(佛山)先进制造业国家卓越工程师创新研究院“揭榜挂帅”项目(JBGS2024006)。
关键词
ALN
复合材料多维结构
石蜡复合材料
热导率
AlN
multidimensional structure of composite materials
paraffin composite
thermal conductivity
作者简介
邓宇强(2000—),男,在读硕士,从事聚合物导热复合材料的研究。;通讯作者:程艳玲,E-mail:chengyanling@gdut.edu.cn。
