Double layer SiO2/Al2O3 high emissivity coatings on stainless steel substrates using simple spray deposition system

Mahadik, DB and Gujjar, S and Gouda, GM and Barshilia, Harish C (2014) Double layer SiO2/Al2O3 high emissivity coatings on stainless steel substrates using simple spray deposition system. Applied Surface Science, 299. pp. 6-11. ISSN 0042-207X

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Official URL: http://dx.doi.org/10.1016/j.apsusc.2014.01.159

Abstract

High emissivity coatings are widely used in spacecraft and industrial furnaces, which have attracted a great attention recently due to energy saving applications. In this study, a simple spray coating method was used to produce double layer high emissivity coatings on stainless steel (SS) substrate by sol-gel process at room temperature. Initially silica (SiO2) sol, prepared using sol-gel process, was deposited on sandblasted SS substrate with required thickness, followed by deposition of aluminium oxide (Al2O3) layer. The gradual increase in the thickness of Al2O3 layer resulted in increase in the emittance. The optimized double layer Al2O3 (23 μm)/SiO2 (9.13 μm) coating on SS substrate exhibited high emittance (ε = 0.92- 0.94) and low absorptance (α = 0.30-0.34). The high emissivity coating, when exposed to a temperature of 1000 ºC in air, showed nearly the same value of emissivity. The SiO2/Al2O3 coating thus provides a simple and cost effective method for the preparation of high emissivity coatings.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s. Elsevier Publisher
Uncontrolled Keywords: Sol–gel;Spray deposition system;SiO2/Al2O3 coating;High emissivity
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 18 Jun 2015 08:14
Last Modified: 18 Jun 2015 08:14
URI: http://nal-ir.nal.res.in/id/eprint/12177

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