关键词: 散热涂料, 碳纤维, 热通道, 散热机理

Abstract: 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 1st 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.

Key words: radiant coating, carbon fiber, heat-transfer channel, radiating mechanism