LED용 Heatsink의 방열성능 향상을 위한 전착도료 연구

Abstract

LED(Light Emitting Diode) lighting is now drawing attention as next generation lighting. The primary factor of the disadvantage for using is the heat radiated from LED lights. So the lifetime of LED lights is considerably reduced due to thermal degradation. The aim of this work is increased the service life to improve the user experience and the performance of LED lighting. Al, Al-Zn alloy, Mg alloy, etc. are used as the materials for heatsink due to the thermal conductivity and the light weight. The higher the output power and the more the number of the used lights are, the larger the size of heatsink is increased. To solve these problems for reducing the size of heatsink, the heatsinks with various cooling methods have been developed like the water-cooled heatsink, air-cooled heatsink, and heat pipe. In this work, the coatings for electrodepositing(ED) were developed to improve the thermal conductivity of the coating film on heatsink. For the uniformity of the coating film, ED coating method was used instead of the spray coating method. To compare sphere pigments and acicular pigments adding for the thermal conductivity, the change of temperature on heatsink was investigated. The surface of the coating film was observed by SEM. Adding pigment made the complex structure in coating film. it was thought that the complex structure provided the path for the thermal conductivity. It was found that the heatsink average temperature and the electrical resistance by networking between the pigments within the coating.