Characterization of Al2O3-TiO2 nano porous solar absorbers derived via MAO/sol-gel hybrid process

被引：54

作者：

Bayati, M. R. ^{[1
]}

Zargar, H. R. ^{[2
]}

Talimian, Ali ^{[1
]}

Ziaee, Ahmad ^{[1
]}

Molaei, Roya ^{[1
]}

机构：

[1] Iran Univ Sci & Technol, Sch Met & Mat Engn, Tehran, Iran

[2] Univ British Columbia, Dept Met & Mat Engn, Vancouver, BC V6T 1Z4, Canada

来源：

SURFACE & COATINGS TECHNOLOGY | 2010年 / 205卷 / 07期

关键词：

Micro arc oxidation; Sol-gel; Coating; Selective; Surface; Composite; MICRO-ARC OXIDATION; PLASMA ELECTROLYTIC OXIDATION; PHOTOCATALYTIC ACTIVITY; SELECTIVE ABSORBERS; CERAMIC COATINGS; TIO2; LAYERS; ALLOY; GROWTH; FILMS;

D O I：

10.1016/j.surfcoat.2010.09.046

中图分类号：

TB3 [工程材料学];

学科分类号：

082905 [生物质能源与材料];

摘要：

Micro arc oxidation combined with sol-gel process was used to develop solar selective absorber systems for the first time. Phase structure and chemical composition of the layers were studied by XRD and XPS techniques. The layers consisted of anatase, rutile, alpha-alumina, gamma-alumina, and Al2TiO5 phases with varying fractions with the growth conditions. SEM and AFM investigations revealed a porous structure (pore size: 60-550 nm) with a rough surface where pore size and surface roughness increased with the applied voltage. Solar absorption and emission coefficients were measured using UV-Vis-NIR and IR spectrophotometry. In spite of being so thin, the fabricated samples revealed a high solar absorptivity of alpha = 0.99 and low thermal emissivity of epsilon = 0.06. A formation mechanism was proposed based on the electrochemical foundations as well. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：2483 / 2489

页数：7

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