Ultra-high temperature porous graded ceramics for solar energy applications

R. Licheri;C. Musa;A. M. Locci;S. Montinaro;R. Orrù
;
G. Cao;
2019

Abstract

Porous graded materials (PGMs) consisting of ZrB2are obtained by Spark Plasma Sintering (SPS) taking advantage of an asymmetric die configuration with changing cross section. Due to the temperature gradient established along the longitudinal direction, porosity changes up to about 26 vol.% were generated across the volume. The surface roughness of the resulting products increased as the holding temperature was reduced. Superior solar absorbance (α) and lower spectral selectivity (α/ε) properties were correspondingly obtained. PGMs displayed higher α and lower α/ε values with respect to highly dense samples produced using a constant cross section die. More important, these products exhibit similar or improved optical properties with respect to the reference SiC material. These findings are important in view of the development of a novel class of ceramics for solar energy applications, able to operate under higher temperature conditions while simultaneously satisfying optical, microstructural and mechanical needs.
2018
Inglese
39
1
72
78
7
http://www.journals.elsevier.com/journal-of-the-european-ceramic-society/
https://www.sciencedirect.com/science/article/pii/S0955221918300384?via%3Dihub
Esperti anonimi
internazionale
scientifica
Optical properties; Porous graded materials; Spark plasma sintering; UHTCs; Zirconium diboride; Ceramics and Composites; Materials Chemistry2506 Metals and Alloys
no
Licheri, R.; Musa, C.; Locci, A. M.; Montinaro, S.; Orrù, R.; Cao, G.; Silvestroni, L.; Sciti, D.; Azzali, N.; Mercatelli, L.; Sani, E.
1.1 Articolo in rivista
info:eu-repo/semantics/article
1 Contributo su Rivista::1.1 Articolo in rivista
262
11
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