Photothermal conversion performance of Fe-Mn-Al-Ni-C lightweight steel
LI Shiyao1, ZHANG Fei2, CHEN Meijie2, LI Kaiyang3, XIONG Zhiping4, SONG Min1, WANG Zhangwei1,4
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. School of Energy Science and Engineering, Central South University, Changsha 410083, China; 3. School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China; 4. National Key Laboratory of Science and Technology on Materials in Impact Environment, Beijing Institute of Technology, Beijing 100081, China
Abstract：In this paper, combined with surface etching and in-situ oxidation process, X-ray diffractometer, scanning electron microscope, energy spectrometer, X-ray photoelectron spectrometer, fiber optic spectrometer, and Fourier transform infrared spectrometer were used, the variations in the oxidation products on the surface of Fe-Mn-Al-Ni-C lightweight steel and their effects on photothermal conversion performance were studied by adjusting the oxidation temperature. The results show that applying etching pretreatment promotes the generation of nano-lamellar oxides, thereby effectively improving the photothermal conversion performance of the alloys compared to using the in situ oxidation process alone. After etching, the oxide size increases as the oxidation temperature rises from 300 ℃ to 400 ℃, leading to an improvement in the photothermal conversion performance of the alloy; the solar energy absorptance and photothermal conversion efficiency of the alloy reach peaks of 96.1% and 90.2%, respectively, after oxidation at 400 ℃ for 2 h; when the oxidation temperature increases to 500 ℃, increased thermal stress due to the mismatch of thermal expansion coefficients causes slight detachment of the oxide layer from the alloy surface, resulting in a decline in photothermal performance; oxidation at 600 ℃ leads to severe oxide layer detachment and the formation of Al2O3, further reducing the photothermal performance.
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