The synthesis and characterization of Al/Co3O4 magnetic composite pigments with low infrared emissivity and low lightness |
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| Institution: | 1. National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 610054, China;2. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;1. Center for Advanced Materials and Energy, Xihua University, Chengdu, 610039, PR China;2. National Engineering Research Center of Electromagnetic Radiation Control Materials, UESTC, Chengdu, 610054, PR China;1. National Engineering Research Center for Coatings, CNOOC Changzhou Paint and Coatings Industry Research Institute Co., Ltd, Changzhou 213016, PR China;2. Specialty Coatings Department, CNOOC Changzhou EP Coating Co., Ltd, Changzhou 213013, PR China;3. National Quality Supervision and Test Center for Coatings, CNOOC Changzhou Paint and Coatings Industry Research Institute Co., Ltd, Changzhou 213016, PR China;1. National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 610054, China;2. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;1. School of Physics and Electronics, Central South University, Changsha 410083, China;2. School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China;3. Hunan Province Engineering Technology Research Center in Novel Chip Inductance and Advanced Manufacturing Equipment, Huaihua 419600, China |
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| Abstract: | The main challenge of low infrared emissivity coatings based on aluminum flake lies in finding an efficient method to synthesize the composite pigment with low infrared emissivity and low lightness simultaneously. In this work, we overcome this constraint to some extent, synthesizing a novel Al/Co3O4 magnetic composite pigments with low infrared emissivity and low lightness by thermal cracking and hot flowing method. The results show that the covering area of Co3O4 on the aluminum flake can be tuned by the amount of CoCO3 adding in precursor and the reaction temperature of hot flowing, both of which pay a key factor on the VIS and IR spectral reflectance and magnetic properties. The magnetic Al/Co3O4 composite pigments with low lightness and low infrared emissivity can be obtained at 130 °C for 24 h in hot flowing liquid. The lightness L1 can be decreased to 69.2, however the infrared emissivity (8–14 μm) is also low to 0.45. Compared with the single Al flakes, Al/Co3O4 magnetic composite pigments present stronger magnetic properties. Therefore, the Al/Co3O4 magnetic composite pigments have offered new choice for the pigments of low infrared emissivity coatings. |
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| Keywords: | Aluminum flake Reflectance Infrared emissivity Lightness |
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