Toward improving the reflectivity of ablative heat-insulating coating under high-energy laser irradiation
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Toward improving the reflectivity of ablative heatinsulating coating under high-energy laser irradiation Chen Ma1, Zhuang Ma2, Lihong Gao2,*, Taotao Wu3, Fuchi Wang2, and Hatsuo Ishida4
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College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China 3 Northwest Institute of Nuclear Technology, Xi’an 710024, China 4 Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH 44106, USA 2
Received: 17 June 2020
ABSTRACT
Accepted: 26 July 2020
Anti-laser damage has become a major concern because of the rapid evolution of high power continuous-wave laser technology. While phenolic matrix composite coatings exhibit good anti-laser property, they show low reflectivity during laser irradiation, resulting in high energy absorption. A novel composite coating that consists of Al(OH)3 and nano-copper fillers with phenolic resin matrix has been designed to solve the low reflectivity problem. X-ray diffraction reveals that Al2O3 particles generate on the surface of the coating during laser irradiation because of the dehydration reaction of Al(OH)3. The endothermic effect of this dehydration reaction and the transpiration of nano-copper particles have a significant cooling effect on the coating. The reflectivity of coating is monitored in real time during laser irradiation. It is confirmed that the reflectivity gradually increases with the accumulation of Al2O3 particles. According to the temperature of back-surface substrates, the improved reflectivity does lead to a better anti-laser property of the coating. The laser ablation behavior of the composite coating was studied in detail through different laser parameters. The results show that both laser power density and irradiation time have effect on the micro-morphologies and reflectivity of the coating.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Maude Jimenez.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10853-020-05138-9
J Mater Sci
GRAPHIC ABSTRACT
Introduction Laser has been used in medicine, material processing, and military science for several decades [1–4]. Due to the rapid development of laser technology, its power density now reaches so high that most materials will be damaged easily in a short duration [5, 6]. It is essential for current researchers to understand the laser ablation behavior of materials and find methods to protect from high power laser damage [7–9]. Anti-laser coating has been reported to be an efficient way for laser protection [10]. Generally, such technology includes coatings with high reflectivity and ablative heat-insulating coatings [11, 12]. The former can reflect a large quantity of laser energy, but it is required to maintain a complete and smooth surface [10]. In reality, such surface can be destroyed easily during laser irradiation and lose high reflectivity property. Ablative heat-insu
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