Optical characterization of hafnium boride and hafnium carbide-based ceramics for solar energy receivers

Anno: 2018

Autori: Musa C., Licheri R., Orrù R., Cao G., Balbo A., Zanotto F., Mercatelli L., Sani E.

Affiliazione autori: Univ Cagliari, Unita Ric Consorzio Interuniv Nazl Sci & Tecnol M, Dipartimento Ingn Meccan Chim & Mat, Via Marengo 2, I-09123 Cagliari, Italy; Univ Ferrara, Engn Dept, Corros & Met Study Ctr Aldo Dacco, Via G Saragat 1, I-44122 Ferrara, Italy; CNR, ISTEC, Inst Sci & Technol Ceram, Via Granarolo 64, I-48018 Faenza, Italy; CNR, INO Natl Inst Opt, Largo E Fermi 6, I-50125 Florence, Italy.

Abstract: The availability of spectrally-selective, thermally stable and more efficient sunlight absorbers represents a crucial aspect for the development of solar energy technologies able to operate at elevated temperature. In this regard, the optical properties of dense HfB2, HfC, HfB2-SiC and HfB2-HfC-SiC products are assessed, compared and discussed in the present work, in view of the possible utilization of such Ultra-High-Temperature Ceramics (UHTCs) for thermodynamic solar energy conversion. The materials above are first produced in bulk form by Spark Plasma Sintering (SPS), starting from ceramic powders preliminarily prepared by Self-propagating Hightemperature Synthesis (SHS), or by reactive-SPS, using elemental reactants. All sintered specimens displayed relative density above 95%, with the composite systems approaching the theoretical density values, due to the beneficial role played by SiC as sintering aid, which also improves the oxidation resistance of the resulting UHTCs. The material composition is found to largely affect the related optical properties, as the SiC addition typically increases solar absorbance and decreases spectral selectivity with respect to pure UHTC boride and carbide phases. A final discussion is given about the best tradeoff material.

Giornale/Rivista: SOLAR ENERGY

Volume: 169      Da Pagina: 111  A: 119

Maggiori informazioni: This work was performed in the framework of the FIRB2012-SUPERSOLAR (Prograrnma Futuro in Ricerca, prot. RBFR12TIT1) project funded by the Italian Ministry of Education, University and Research. Thanks are due Mr. Mauro Pucci and Mr. Massimo D’Uva (CNR-INO) for technical support and to Mrs. Roberta Parenti and Mrs. Pasqualina Pipino (CNR-INO) for administrative support.
Parole chiavi: Borides; Carbides; Ceramic materials; Cermets; Energy conversion; Optical properties; Oxidation resistance; Powders; Silicon carbide; Silicon compounds; Solar absorbers; Solar buildings; Solar energy; Spark plasma sintering; Temperature, Concentrating solar power; Hafnium diboride; Material compositions; Optical characterization; Self-propagating high temperature synthesis; Solar energy technologies; UHTCs; Ultra-high-temperature ceramics, Hafnium compounds, absorbance; ceramics; concentration (composition); energy efficiency; equipment; high temperature; optical property; oxidation; solar power; thermodynamics
DOI: 10.1016/j.solener.2018.04.036

Citazioni: 22
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