Annealing effect on the optical properties and interdiffusion of MgO/Zr/MgO multilayered selective solar absorber coatings

被引：33
|
作者：
Nuru, Z. Y. [1 ,2 ]
Perez, D. [3 ]
Kaviyarasu, K. [1 ,2 ]
Vantomme, A. [3 ]
Maaza, M. [1 ,2 ]
机构：
[1] Univ South Africa UNISA, Coll Grad Studies, UNESCO UNISA Africa Chair Nanosci Nanotechnol, Pretoria, South Africa
[2] Natl Res Fdn, Mat Res Dept, iThemba LABS, Nanosci African Network, Durban, South Africa
[3] Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Leuven, Belgium
来源：
SOLAR ENERGY | 2015年 / 120卷
基金：
新加坡国家研究基金会;
关键词：
Spectral selectivity; Optical properties; Thermal stability; Interdiffusion; THERMAL-STABILITY;
D O I：
10.1016/j.solener.2015.07.022
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：
Selective solar absorber coatings based on MgO/Zr/MgO multilayered coatings were prepared onto Zr coated stainless steel substrates using e-beam evaporation. It was found that MgO/Zr/MgO multilayered solar absorber coatings exhibited a good spectral selectivity of 0.91/0.12. The effect of annealing on the optical properties and interdiffusion between the layers was investigated. Annealing the multilayered coating in air up to 300 degrees C did not show significant change on the spectral selectivity as well as on the interdiffusion between the layers indicating the coating's thermal stability up to that temperature. Annealing in air at 400 degrees C leads to decrease in solar absorptance and an increase in thermal emittance considerably, which was due to the interlayers appeared between MgO and Zr layers, oxidation of Zr layers, and change in both thickness and composition of the layers as investigated by RES analysis. The MgO/Zr/MgO MSSACs were found to be thermally stable up to 250 degrees C in air for 24 h. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：123 / 130
页数：8
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