High Emissivity Ceramic Coatings Formed on Light Metals by Microarc Oxidation: Microstructure and Heat Dissipation Property
作者
单位
aInstitute for Advanced Ceramics、Harbin Institute of Technology、Harbin、China bKey Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology、Harbin Institute of Technology、Harbin、China
收录来源
International Corrosion Congress · 第22届国际腐蚀大会
摘要
An infrared emissivity coating material containing γ -Al2O3 was prepared on Al alloy surface by the microarc oxidation (MAO) method. Results show that the infrared emissivity values of coated Al samples depend on the phase composition and surface roughness of the coatings. Corresponding to increasing coatings thickness, the gradually increasing γ-Al2O3 content and some oxide compounds containing Si and P contribute to the higher infrared emissivity value (about 0.85) in the wavelength range of 8 –20 μm. The i ncreasing surface roughness leads to an obvious increase in emissivity from 0.2 to 0.4 at wavelength 3 –5 μm. The high emissivity coating coated on the chip surface, it has excellent heat dissipation effect, reducing the chip temperature by 8 ° C, and has been successfully applied in high -power LED and 5G base stations.