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Article Dans Une Revue Ceramics International Année : 2020

The impact of oxidation on the optical properties of Si–SiC materials

Résumé

Silicon carbide is an interesting candidate for high-temperature solar receiver due to its high solar absorptivity and its resistance to oxidation in air. Its oxidation stays passive with the formation of a protective silica layer up to 1900 K. Nevertheless, silica presents a lower spectral emissivity than silicon carbide in the solar range. Therefore the growth of a silica layer may affect the values of the spectral emissivity and therefore the surface receiver thermal efficiency. We have investigated here how high-temperature ageing in air affects the spectral emissivity and the thermal efficiency of commercial Si-SiC materials. We were able to correlate the variations of the spectral emissivities to the advancement of the oxidation using scanning electron microscopy, ellipsometry and 3D profilometry. Especially we observed a significant improvement of the surface receiver thermal efficiency due to the increase of the surface roughness that increases the solar absorptivity.

Domaines

Matériaux
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Dates et versions

hal-02916030 , version 1 (17-08-2020)

Identifiants

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Ludovic Charpentier, Cyril Caliot, Jean-Louis Sans, Angélique Bousquet. The impact of oxidation on the optical properties of Si–SiC materials. Ceramics International, 2020, 46, pp.28536. ⟨10.1016/j.ceramint.2020.08.011⟩. ⟨hal-02916030⟩
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