针对LED高效散热以降低芯片p-n结温、提高光通量及延长寿命的关键问题，提出在LED封装铝基板两侧一步微弧氧化原位构建含SiC与AlN协同提高导热与热发射性能的纳米Al2O3-SiC-AlN全新结构陶瓷涂层，实现导热/绝缘/高发射率辐射散热三重功能。通过微弧氧化电解液中高发射率高导热SiC和AlN纳米粒子的表面活性剂改性及匹配掺杂，研究纳米SiC与AlN粒子分散特性及氧化工艺参数对放电过程、涂层生长与微观结构的作用机制；揭示涂层相组成、孔隙率及掺杂陶瓷粒子在涂层中的分布状态等对发射率、热导率及绝缘特性的影响规律，阐明微观结构调控与SiC-AlN协同强化热发射及热导率的物理机制；以LED结温测温装置考察铝封装双侧涂层结构（特别是发射率分布特性）对辐射降温性能影响，优选出高辐射散热涂层与工艺。本课题对于探索LED封装用金属基板绝缘散热涂层新方法、丰富散热涂层理论具有重要学术与应用价值。

The objective of the research is to propose a novel fabricating method of ceramic coatings with Al2O3-SiC-AlN on aluminum substrate for heat dissipation of high-power leds by simple one-step microarc oxidation technique, and further understand the interrelationship between microstructure and thermal conductivity,insulating as well as emissivity. Such special structural coatings are expected to be an effective way to resolve the key issues on increasing the light lumen and lifetime, by enhancing the conductivity and radiative heat dissipation. This research will focus on: tailoring the contollable growth of Al2O3 based ceramic coatings by adding high emissivity nano SiC and AlN additives into the electrolyte, and revealing the effects of surface activating SiC and AlN as well as microarc oxidation processing parameters on microarc discharging behaviours, coating growth and microstructure; and investigating the effects of coating composition and structure(including phase composition, micropores defects and distribution state of nano particles additives in the coating) on spectral emissivity, thermal conductivity and insulation properties, revealing the enhancing mechanisms of emissivity and conductivity by morphology controling and SiC-AlN doping; taking the self-constructive LED junction temperature test equipment to examine the p-n junction temperature decreasing by heat dissipation effect of thermal radiation coating, and further understand the interrelationship between temperature decreasing and spectral emissivity distribution. Finally, the process parameters and coating structure were optimized to obtain the high performance radiative heat dissipation coating. The proposed project has a broader societal impact on scientific disciplines and engineering applications. Not only will it enriches the thermal controling theories of radiative heat dissipation, but will also explore and find the novel way to fabricate radiative heat dissipation coating of aluminum substrate for high-power leds.