碳纤维涂料的导热性能分析  

Analysis on Thermal Performance of Carbon Fiber Coating

作　　者：李静[1,2] 李雪 刘业明 吴少如[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640 [2]华南理工大学珠海现代产业创新研究院,广东珠海519175

出　　处：《华南理工大学学报（自然科学版）》2017年第9期128-134,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家高技术研究发展计划项目(2010AAJ301);广东省第三批省战略性新兴产业发展专项资金资助项目(2012A080304015)~~

摘　　要：电子元件的工作温度直接决定其使用寿命和性能稳定性,为保证其正常工作,需要解决其散热问题.散热涂料是解决电子元件的散热问题的良好方法,文中制备了一种以丙烯酸-氨基树脂体系为基体、碳纤维为主要导热填料的复合型散热涂料,用单因素方法确定了碳纤维含量对涂层散热效果的影响.结果表明:随着碳纤维含量的增加,涂层的散热效果及导热系数均呈现先增大后减小的趋势,在碳纤维质量分数为12.3%时其散热效果最佳.此时,该涂料的综合性能良好,涂层附着力达到1级,硬度达到H级,导热系数为1.61 W/(m·K).通过SEM观测了涂层的表面结构并测量其导热系数,探究了涂层的导热机理,发现:碳纤维的加入使得涂层形成了一种有利于热量快速传导的热"通道",并存在最佳添加量,超过最佳添加量会因为碳纤维的堆积现象和碳纤维的各向异性而导致散热效果下降.As the working temperatures of electronic modules directly affect their service life and stability,the corresponding heat emission problem should be solved,so as to ensure their working reliability. Radiant coatings are effective in cooling electronic modules. In the investigation,a new type of composite radiant coating was prepared with carbon fibers as the main thermal conductive fillers and an acrylic-amino resin system as the matrix. Then,by means of the single factor method,the effect of the content of carbon fibers on the heat dispersion of the coating was discussed. The results show that,as the content of carbon fibers increases,the heat dispersion and heat conduction coefficient of the coating both tend to increase firstly and then decrease,and that,when the mass fraction of carbon fibers is 12. 3% ,the coating achieves a best heat dispersion effect and exhibits an excellent comprehensive performance,specifically,the adhesion,hardness and heat conduction coefficient of the coating are respectively 1 st grade,grade H and 1. 61 W/( m·K)). Furthermore,the surface structure of the coating was characterized by means of SEM,and the thermal conductivity was measured. Finally,the mechanism of the heat conduction was also explored. It is found that the addition of carbon fibers into the coating causes a kind of heat-transfer channel for fast heat conduction to form,and there exists an optimal dosage of carbon fibers. Specifically,due to the packing phenomenon and anisotropy of carbon fibers,excessive carbon fibers will cause the heat dispersion effect to degrade.

关 键 词：散热涂料 碳纤维 热通道 散热机理 

分 类 号：TQ63[化学工程—精细化工]