Silicon oxycarbide and silicon oxycarbonitride materials under concentrated solar radiation
2021
Mazo Fernández, María Alejandra | Padilla, Isabel | López-Delgado, Aurora | Tamayo Hernando, Aitana | Rubio Alonso, Juan | Ministerio de Economía, Industria y Competitividad (España) | Ministerio de Asuntos Exteriores y Cooperación (España) | European Commission | Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
The potential application of silicon oxycarbonitride (SiOCN), silicon oxycarbide (SiOC) and silicon oxycarbide¿SiC (SiOC¿SiC) for photothermal devices such as volumetric solar absorbers has been studied evaluating the response to thermal shock from a Fresnel lens. The accelerated ageing test comprises fast heating (32¿C min¿1 ) and cooling rates (27¿C min¿1 ) from 100 to 1000¿C and dwelling times of 10 min. Porous materials (SiOCNp and SiOCp) failed the thermal shock tests; they were massively degraded by the formation of a large depression in the focus of solar radiation. Dense materials (SiOCd and SiOC¿SiCd) withstood 100 cycles of thermal shock ageing tests due to the formation of a protective silica layer. The absorptance values for dense materials remained fairly constant before and after thermal shock tests: from 94.5 to 94.3% for SiOCd and from 93.3 to 93.3% for SiOC¿SiCd . These preliminary studies indicate their potential for high-temperature solar receiver applications.
Mostrar más [+] Menos [-]This research was funded by MINISTERIO DE ECONOMÍA, INDUSTRIA Y COMPETITIVIDAD OF SPAIN, [ENE2012-39385-CO3-01] and SPANISH RESEARCH AGENGY AND THE EUROPEAN REGIONAL DEVELOPMENT FUND (AEI/FEDER, UE), [MAT2016-78700-R].We acknowledge support of the publication fee by the Spanish National Research Council (CSIC) Open Access Publication Support Initiative through its Unit of Information Resources for Research (URICI).
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