Effect of TiC incorporation on the optical properties and oxidation resistance of SiC ceramics

Héléne Arena (1) , Moustapha Coulibaly (1) , Audrey Soum-Glaude (2) , Alban Jonchere (3) , Guilhem Arrachart (4) , Adel Mesbah (5) , Nicolas Pradeilles (6) , Marion Vandenhende (6) , Alexandre Maître (6) , Xavier Deschanels (1)

1 LNER - Nanomatériaux pour l'Energie et le Recyclage
2 PROMES - Procédés, Matériaux et Energie Solaire
3 L2IA - Ions aux Interfaces Actives
4 LTSM - Tri ionique par les Systèmes Moléculaires auto-assemblés
5 LIME - Interfaces de Matériaux en Evolution
6 IRCER - Institut de Recherche sur les CERamiques

In concentrating solar power (CSP) technologies, the absorber material should be spectrally selective under severe operating conditions, i.e. ~1000°C under air atmosphere. SiC-TiC nanocomposites could be good candidates for this application due to their spectral selectivity at room temperature, but their behavior under CSP operating conditions is unknown. Therefore, the spectral selectivity and oxidation resistance of TiC-SiC composites were studied up to 500 °C, under air, for various compositions. During heating, the emittance increased with the temperature. After heating, the TiC grains at the surface were oxidized into TiO2, while SiC grains showed good behavior. However, despite little oxidation, the spectral selectivity of the nanocomposites remained interesting after heating. Specific oxidation tests up to 9 days at 1000°C under air showed an increase of the oxidation resistance with the amount of SiC. This result is the consequence of the formation of a protective layer of SiO2 preventing the oxidation of the TiC grains. The composition 30 at% TiC-70 at% SiC seems to be a good compromise between low oxidation and good selectivity.

Mots clés: SiC; TiC; nano composite; oxidation resistance; optical properties; CSP; high temperature; ceramics; reflectance

Domaines: Matériaux

Héléne Arena, Moustapha Coulibaly, Audrey Soum-Glaude, Alban Jonchere, Guilhem Arrachart, et al.. Effect of TiC incorporation on the optical properties and oxidation resistance of SiC ceramics. Solar Energy Materials and Solar Cells, 2020, 213, pp.110536. ⟨10.1016/j.solmat.2020.110536⟩. ⟨hal-03005934⟩