摘要： 以聚硅氧烷为成膜物质,石墨烯粉体为填料,采用溶胶凝胶法制备了导热散热复合涂层。采用红外成像仪和热导率仪对材料的导热散热性能进行表征,并对复合涂层的附着力和硬度进行测试。结果表明,当石墨烯含量为聚硅氧烷质量的12%时,复合涂层的热导率可达到1.02 W/(m·K),相比于纯聚硅氧烷涂层提高了近4倍,在100℃热源下,该涂层可使基体降温7℃。此外,该涂层具有一定的疏水自洁性、良好的附着能力和较高的硬度,使用性能佳。

关键词: 聚硅氧烷; 石墨烯; 散热; 导热

Abstract: A heat conducting and dissipating composite coating is prepared by solgel method, using polysiloxane as film-forming substance and graphene powder as filler. The heat conduction and dissipation are characterized by infrared thermal imager and thermal conductivity meter. Moreover, the adhesion and hardness of the composite coating are investigated. The result shows that the thermal conductivity of the composite coating reaches 1.02 W/m.K when the graphene content is 12 wt%, which is nearly 4 times higher than that of the pure polysiloxane coating. When the coated substrate is exposed to the heat source of 100℃, the temperature of the substrate can be reduced by 7℃. In addition, the coating shows good hydrophobic and self-cleaning performance, excellent adhesion and high hardness as well as good application.

Key words: polysiloxane; graphene; heat dissipation; heat conductivity