Microstructural, optical properties and thermal stability of MgO/Zr/MgO multilayered selective solar absorber coatings

被引：51
|
作者：
Nuru, Z. Y. [1 ,2 ]
Msimanga, M. [4 ]
Muller, T. F. G. [3 ]
Arendse, C. J. [3 ]
Mtshali, C. [1 ,2 ]
Maaza, M. [1 ,2 ]
机构：
[1] Univ S Africa UNISA, UNESCO UNISA Africa Chair Nanosci Nanotechnol, Coll Grad Studies, Pretoria, South Africa
[2] Natl Res Fdn, Nanosci African Network, Mat Res Dept, IThemba LABS, Pretoria, South Africa
[3] Univ Western Cape, Dept Phys, ZA-7535 Bellville, South Africa
[4] Tshwane Univ Technol, Dept Phys, ZA-0001 Pretoria, South Africa
来源：
SOLAR ENERGY | 2015年 / 111卷
基金：
新加坡国家研究基金会;
关键词：
Selective solar absorber; Microstructure; Optical property; Thermal stability; X-RAY-SCATTERING; NANO-PARTICLES; THIN-FILMS; ERDA; DESIGN; LAYER; TEM;
D O I：
10.1016/j.solener.2014.11.009
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
MgO/Zr/MgO multilayered selective solar absorber coating (MSSAC) was deposited onto Zr coated stainless steel substrates using e-beam evaporation. The MSSAC exhibited a solar absorptance of about 0.92 in the solar spectrum range and low thermal emittance of about 0.09 in the infrared range. Optical constants of the MSSAC were determined from the experimentally measured reflectance spectra. The MgO/Zr/MgO MSSAC was found to be thermally stable up to 400 degrees C. However at 500 degrees C, the solar absorptance decreased to 0.893 from 0.918, and the thermal emittance increased to 0.12 from 0.10. The change in the optical properties is attributed to the outward diffusion of Zr towards the surface as well as oxidation of the Zr base layer and a change in the chemical composition of MgO as probed by Heavy Ion Elastic Recoil Data Analysis. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：357 / 363
页数：7
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