Characterisation of CVD-tungsten-alumina cermets for high-temperature selective absorbers

被引：19

作者：

Berghaus, A ^{[1
]}

Djahanbakhsh, A ^{[1
]}

Thomas, LK ^{[1
]}

机构：

[1] Tech Univ Berlin, Inst Met Werkstoffe Met Phys, D-10623 Berlin, Germany

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 1998年 / 54卷 / 1-4期

关键词：

tungsten-alumina cermets; absorption;

D O I：

10.1016/S0927-0248(97)00219-5

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：

Solar selective tungsten-alumina cermets were deposited with a low-pressure cold-wall CVD-system utilising the simultaneous pyrolytical decomposition of tungstenhexacarbonyl and aluminiumtriisopropylate (ATI). The deposition results in amorphous W-WOx-Al2O3 films. After a post-deposition annealing in pure hydrogen at 800 degrees C for a maximum of 1 h the films consist of fine grained gamma-alumina and metallic tungsten. The hemispheric reflectivity was measured from 0.2-25 mu m and compared to the emissivity, measured with a thermopile set-up. An absorptivity of 0.85 and an emissivity of 0.04 could be obtained for a single layer on copper substrates, Improvement of the absorption by a gradient of the tungsten content in the layer was investigated. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

引用

页码：19 / 26

页数：8

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