Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 670, Issue -, Pages 275-280Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.02.028
Keywords
Flake aluminum; Infrared emissivity; Core-shell structure; Galvanic displacement; Low lightness
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Funding
- National Natural Science Foundation of China [51402241]
- Open Foundation of National Engineering Research Center of Electromagnetic Radiation Control Materials [ZYGX2013K001-1]
- Research Project of the Education Department of Sichuan Province [15ZB0138]
- Zhicheng Project of Science and Technology Department from Sichuan Province [2014016]
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We have successfully developed a magnetic Al/Ni core-shell pigment via a galvanic displacement reaction to obtain low infrared emissivity pigment with low lightness and visible light reflectance. Al/Ni core-shell particles were prepared via a simple one-step synthetic method where Ni was deposited onto the Al surface at the expense of Al atoms. The influence of pH and the amount of NH4F complexing agent on phase structure, surface morphology, optical and magnetic properties were studied systematically. The neutral condition and high concentration of NH4F forms smooth, flat, uniform and dense Ni shell on the surface of flake Al particles, which can significantly reduce the lightness and visible light reflectance but slightly increase the infrared emissivity. When the coreeshell pigments are prepared in neutral pH solution at NH4F = 11.2 g/L, the lightness (L*) and visual light reflectivity can be reduced by 12.6 and 0.46, respectively versus uncoated flake Al pigments, but the infrared emissivity is only increased by 0.02. The color changes from brilliant silver to gray black and the saturation magnetization value is 6.59 emu/g. Therefore, these Al/Ni magnetic composite pigments can be used as a novel low infrared emissivity pigment to improve the multispectral stealth performance of low-E coatings in the visual, IR and Radar wavebands. (C) 2016 Elsevier B.V. All rights reserved.
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