1 School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, Guangdong, China 2 School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
The highly ordered porous anodic alumina was prepared by anodic oxidation technology, after being treated by AC phosphoric pore broadening, the Cu-Ni nano composite particles were deposited into anodic alumina pores by AC frequency with 50Hz in different voltages, different time and different temperatures. The spectra result shows that the coating prepared under the conditions of voltage is 12V, time is 600s, temperature is 25℃ has good solar absorption performance, the absorptivity is 0.91, emissivity is 0.18, quality factor is 4.9. The SEM and XRD analysis show that CuAl2O4/Cu-Ni composite nanorods were deposited on the surface of the composite oxide coating. After heat treatment at 600℃, the solar absorption and infrared emission of target coating have a small fluctuation and the thermal stability of the coating system is greatly improved. The existing of CuAl2O4 limits the diffusion of metal particles under high temperature environment at the interface, which prevents the Cu/Ni from being oxidized.
JANG J X , ZHAO J X , JIANG R , et al. Preparation methods for solar thermal absorbing films:present situation and development[J]. Materials Review, 2009, 23 (21): 101- 104.
CEN H X . Heat utilization of solar energy[M]. Beijing: Tsinghua University Press, 1997: 21.
CAO F , MCENANEY K , CHEN G , et al. A review of cermet-based spectrally selective solar absorbers[J]. Energy and Environmental Science, 2014, 7 (5): 1615- 1627.
ZHAO S , RIBBING C G , WACKELGARD E . Optical constants of sputtered Ni/NiO solar absorber film-depth-profiled characterization[J]. Solar Energy Materials & Solar Cells, 2004, 84 (1/4): 193- 203.
ZHAO S , WACKELGARD E . Optimization of solar absorbing three-layer coatings[J]. Solar Energy Materials & Solar Cells, 2006, 90 (3): 243- 261.
FAROOQ M , LEE Z H . Computations of the optical properties of metal/insulator-composites for solar selective absorbers[J]. Renewable Energy, 2003, 28 (9): 1421- 1431.
FAROOQ M , HUTCHINS M G . A novel design in composities of various materials for solar selective coatings[J]. Solar Energy Materials & Solar Cells, 2002, 71 (4): 523- 535.
FAROOQ M , HUTCHINS M G . Optical properties of higher and lower refractive index composites in solar selective coatings[J]. Solar Energy Materials & Solar Cells, 2002, 7 (1): 36- 41.
DING D W , CAI W M , LONG M . Optical structural and thermal characteristics of Cu/CuAl2O4 hybrids deposited in anodic aluminum oxides selective solar absorber[J]. Solar Energy Materials and Solar Cells, 2010, 94 (10): 1578- 1581.
GAO Y , XIONG J , GONG D , et al. Improvement of solar absorbing property of Ni-Mo based thermal spray coatings by laser surface treatment[J]. Vacuum, 2015, 121, 64- 69.
杨世铭, 陶文铨. 传热学[M]. 北京: 高等教育出版社, 2006: 366- 374.
YANG S M , TAO W Q . Heat transfer[M]. Beijing: Higer Education Press, 2006: 366- 374.
DHAK D , PANCHANAN P P . Particle size comparison of soft-chemically prepared transition metal(Co, Ni, Cu, Zn) aluminate spinels[J]. Journal of the American Chemical Society, 2006, 89 (3): 1014- 1021.