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EnglishUltra-high temperature boride ceramics have proved to show promising properties for novel solar receivers. The present work shows a further step towards their actual application, investigating how sintering technique and starting powders composition affect the properties of final materials. Thus we report on the comparative characterization of ZrB2, HfB2 and TaB2 produced by high pressure and pressureless techniques and with different amounts of MoSi2 sintering aid. We investigate microstructural, mechanical and optical properties, in the perspective to assess the material potential for novel solar absorbers operating at higher temperatures than those currently available. Moreover, a systematic study has been carried out on ZrB2, producing with fixed high pressure sintering technique, a series of samples with MoSi2 compositions in the range 5–50 vol%. We show that the content of silicide and silicide-related secondary phases in the final pellets affects either the mechanical performance and the optical behavior. Thus, as far as the optical properties are concerned, the MoSi2 amount should be the lowest as possible to ensure a proper material consolidation whilst enhancing the absorbance/spectral selectivity.
| Data di pubblicazione: | 2016 | |
| Titolo: | Process and composition dependence of optical properties of zirconium, hafnium and tantalum borides for solar receiver applications | |
| Autori: | Sani, Elisa; Mercatelli, Luca; Meucci, Marco; Silvestroni, Laura; Balbo, Andrea; Sciti, Diletta | |
| Rivista: | SOLAR ENERGY MATERIALS AND SOLAR CELLS | |
| Keywords: | Ultra-high temperatureceramics, Optical properties, Solar absorbers, Solar plants, Concentrating solarpower | |
| Abstract in inglese: | Ultra-high temperature boride ceramics have proved to show promising properties for novel solar receivers. The present work shows a further step towards their actual application, investigating how sintering technique and starting powders composition affect the properties of final materials. Thus we report on the comparative characterization of ZrB2, HfB2 and TaB2 produced by high pressure and pressureless techniques and with different amounts of MoSi2 sintering aid. We investigate microstructural, mechanical and optical properties, in the perspective to assess the material potential for novel solar absorbers operating at higher temperatures than those currently available. Moreover, a systematic study has been carried out on ZrB2, producing with fixed high pressure sintering technique, a series of samples with MoSi2 compositions in the range 5–50 vol%. We show that the content of silicide and silicide-related secondary phases in the final pellets affects either the mechanical performance and the optical behavior. Thus, as far as the optical properties are concerned, the MoSi2 amount should be the lowest as possible to ensure a proper material consolidation whilst enhancing the absorbance/spectral selectivity. | |
| Digital Object Identifier (DOI): | 10.1016/j.solmat.2016.06.028 | |
| Handle: | http://hdl.handle.net/11392/2348225 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| Sani Process and composition dependance of optical properiesof zirconium, hafnium and tantalum boride for solar receiver applications.pdf | Full text editoriale | Full text (versione editoriale) | NON PUBBLICO - Accesso privato/ristretto | Administrator Richiedi una copia |
| 11392_2348225_preprint_Balbo.pdf | Pre print | Pre-print | PUBBLICO - Pubblico con Copyright | Open Access Visualizza/Apri |
http://hdl.handle.net/11392/2348225
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