Processing, mechanical and optical properties of additive-free ZrC ceramics prepared by Spark Plasma Sintering

MUSA, CLARA;LICHERI, ROBERTA;ORRU', ROBERTO;CAO, GIACOMO;
2016

Abstract

In the present study, nearly fully dense monolithic ZrC samples are produced and broadly characterized from microstructural, mechanical and optical points of view. Specifically, 98% dense products are obtained by Spark Plasma Sintering (SPS) after 20 min dwell time at 1850 °C starting from powders preliminarily prepared by Self-propagating High-temperature Synthesis (SHS) followed by 20 min ball milling. A prolonged mechanical treatment up to 2 h of SHS powders does not lead to appreciable benefits. Vickers hardness of the resulting samples (17.5 ± 0.4 GPa) is reasonably good for monolithic ceramics, but the mechanical strength (about 250 MPa up to 1000 °C) could be further improved by suitable optimization of the starting powder characteristics. The very smoothly polished ZrC specimen subjected to optical measurements displays high absorption in the visible-near infrared region and low thermal emittance at longer wavelengths. Moreover, the sample exhibits goodspectral selectivity (2.1-2.4) in the 1000-1400 K temperature range. These preliminary results suggest that ZrC ceramics produced through the two-step SHS/SPS processing route can be considered as attractive reference materials for the development of innovative solar energy absorbers.
Inglese
9
6
489
1
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http://www.mdpi.com/1996-1944/9/6/489/pdf
https://www.mdpi.com/1996-1944/9/6/489
Esperti anonimi
internazionale
scientifica
Carbides; Mechanical properties; Optical properties; Self-propagating high-temperature synthesis; Spark Plasma Sintering; Ultra-high-temperature-ceramics; Materials Science (all)
no
Musa, Clara; Licheri, Roberta; Orru', Roberto; Cao, Giacomo; Sciti, Diletta; Silvestroni, Laura; Zoli, Luca; Balbo, Andrea; Mercatelli, Luca; Meucci, Marco; Sani, Elisa
1.1 Articolo in rivista
info:eu-repo/semantics/article
1 Contributo su Rivista::1.1 Articolo in rivista
262
11
open
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