Influence of Fe 2 O 3 on the structure and near-infrared emissivity of aluminosilicate glass coatings
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Influence of Fe2O3 on the structure and near‑infrared emissivity of aluminosilicate glass coatings Abdelaziz Gahmousse1 · Kouider Ferria1 · Juan Rubio2 · Nilo Cornejo2 · Aitana Tamayo2 Received: 23 June 2020 / Accepted: 13 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The present paper reports on the development of a vitreous material with high near-infrared (NIR) emissivity. Silica-based glasses (SiO2, Na2O, Al2O3, K2O) with different F e2O3 (hematite) contents are deposited on ceramic tiles as coatings and annealed at 1250 °C. Using the indirect radiometric measurement method, the emissivity of the materials was determined at room temperature, where the spectral directional reflectance of the coatings was measured. The samples possessing high emissivity values of 0.78–0.80 in the near-infrared are those with the highest F e2O3 contents. Colorimetric test (L*a*b*), has revealed that the glass coating goes darker red by adding more amount of Fe2O3. XRD analysis has shown the magnetite, hematite, and nepheline crystallization phases in the glasses with Fe2O3 contents above 30 wt%. Readable aspects of FTIR absorbance spectra were found, which gave information about the structure variations of these glasses as a function of Fe2O3 content, also, SEM photographs displayed morphology of the prepared glass coatings. Keywords Glass coating · Fe2O3 · Near-infrared emissivity · Structure · Microstructure
1 Introduction Glass and ceramic coatings offer high-performance protective layers to solve many different problems related to corrosion, wear, high temperature, heat transfer by radiation, thermal insulation, etc. [1–3]. During the last years, the emissivity property has received considerable attention. A wide variety of materials with high emissivity have been developed, characterized and used, particularly when * Abdelaziz Gahmousse [email protected]; abdelaziz.gahmousse@univ‑setif.dz
Kouider Ferria [email protected]; ferria_kouider@univ‑setif.dz
Juan Rubio [email protected] Nilo Cornejo [email protected] Aitana Tamayo [email protected] 1
Applied Optics Laboratory, Institute of Optics and Precision Mechanics, Ferhat Abbas University Setif 1, 19000 Setif, Algeria
Ceramics and Glass Institute, CSIC, Kelsen 5, 28049 Madrid, Spain
2
deposited as coatings over metals, alloys and ceramics for high-temperature industrial applications, including heat protection and insulation systems [4, 5], aeronautics and space applications [5–14], automotive [9], electronics [9, 15–18], solar cells and for furnaces walls refractories [19, 20]. At the same time, ceramic materials are commonly used as substrates due to their high hardness (wear-resistant, rigid, and harder than steel), and resistance to corrosion, while their main property is to have high-temperature resistance and excellent heat insulation [1–3]. When a glass coating covers a ceramic substrate, an important property occurs, which is the heat transfer between both materials [14, 21–24]. Among the three
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