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EnglishUltra-high temperatureborideceramicshaveprovedtoshowpromisingpropertiesfornovelsolarre- ceivers.Thepresentworkshowsafurthersteptowardstheiractualapplication,investigatinghowsin- tering techniqueandstartingpowderscompositionaffectthepropertiesof final materials.Thuswe report onthecomparativecharacterizationofZrB2, HfB2 and TaB2 produced byhighpressureand pressurelesstechniquesandwithdifferentamountsofMoSi2 sintering aid.Weinvestigatemicro- structural, mechanicalandopticalproperties,intheperspectivetoassessthematerialpotentialfornovel solar absorbersoperatingathighertemperaturesthanthosecurrentlyavailable.Moreover,asystematic study hasbeencarriedoutonZrB2, producingwith fixedhighpressuresinteringtechnique,aseriesof samples withMoSi2 compositions intherange5–50 vol%.Weshowthatthecontentofsilicideand silicide-relatedsecondaryphasesinthe final pelletsaffectseitherthemechanicalperformanceandthe optical behavior.Thus,asfarastheopticalpropertiesareconcerned,theMoSi2 amount shouldbethe lowestaspossibletoensureapropermaterialconsolidationwhilstenhancingtheabsorbance/spectral selectivity.
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| Titolo: | Process and composition dependence of optical properties of zirconium, hafnium and tantalum borides for solar receiver applications |
| Autori: | |
| Data di pubblicazione: | 2016 |
| Rivista: | |
| Abstract: | Ultra-high temperatureborideceramicshaveprovedtoshowpromisingpropertiesfornovelsolarre- ceivers.Thepresentworkshowsafurthersteptowardstheiractualapplication,investigatinghowsin- tering techniqueandstartingpowderscompositionaffectthepropertiesof final materials.Thuswe report onthecomparativecharacterizationofZrB2, HfB2 and TaB2 produced byhighpressureand pressurelesstechniquesandwithdifferentamountsofMoSi2 sintering aid.Weinvestigatemicro- structural, mechanicalandopticalproperties,intheperspectivetoassessthematerialpotentialfornovel solar absorbersoperatingathighertemperaturesthanthosecurrentlyavailable.Moreover,asystematic study hasbeencarriedoutonZrB2, producingwith fixedhighpressuresinteringtechnique,aseriesof samples withMoSi2 compositions intherange5–50 vol%.Weshowthatthecontentofsilicideand silicide-relatedsecondaryphasesinthe final pelletsaffectseitherthemechanicalperformanceandthe optical behavior.Thus,asfarastheopticalpropertiesareconcerned,theMoSi2 amount shouldbethe lowestaspossibletoensureapropermaterialconsolidationwhilstenhancingtheabsorbance/spectral selectivity. |
| Handle: | http://hdl.handle.net/11392/2348225 |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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