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Silicon Oxycarbide and Silicon Oxycarbonitride Materials under Concentrated Solar Radiation.


ABSTRACT: 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.

SUBMITTER: Mazo MA 

PROVIDER: S-EPMC7924838 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Silicon Oxycarbide and Silicon Oxycarbonitride Materials under Concentrated Solar Radiation.

Mazo M Alejandra MA   Padilla Isabel I   López-Delgado Aurora A   Tamayo Aitana A   Rubio Juan J  

Materials (Basel, Switzerland) 20210221 4


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<sup>-1</sup>) and cooling rates (27 °C min<sup>-1</sup>) from 100 to 1000 °C and dwelling times of 10 min. Porous materials (SiOCN<sub>p</sub> and SiOC<sub>p</sub>) failed t  ...[more]

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