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Effects of Co2O3 Addition on Microstructure and Properties of SiC Composite Ceramics for Solar Absorber and Storage

  • Advanced Materials
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Abstract

SiC composite ceramics for solar absorber and storage integration are new concentrating solar power materials. SiC composite ceramics for solar absorber and storage integration were fabricated using SiC, black corundum and kaolin as the raw materials, Co2O3 as the additive via pressureless graphite-buried sintering method in this study. Influences of Co2O3 on the microstructure and properties of SiC composite ceramics for solar absorber and storage integration were studied. The results indicate that sample D2 (5wt% Co2O3) sintered at 1 480 °C exhibits optimal performances for 119.91 MPa bending strength, 93% solar absorption, 981.5 kJ/kg (25–800 °C) thermal storage density. The weight gain ratio is 12.58 mg/cm2 after 100 h oxidation at 1 000 °C. The Co2O3 can decrease the liquid phase formation temperature and reduce the viscosity of liquid phase during sintering. The liquid with low viscosity not only promotes the elimination of pores to achieve densification, but also increases bending strength, solar absorption, thermal storage density and oxidation resistance. A dense SiO2 layer was formed on the surface of SiC after 100 h oxidation at 1 000 °C, which protects the sample from further oxidation. However, excessive Co2O3 will make the microstructure loose, which is disadvantageous to the performances of samples.

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Authors and Affiliations

  1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China

    Yang Zhou  (周炀), Jianfeng Wu  (吴建锋), Kezhong Tian, Xiaohong Xu, Sitong Ma & Shaoheng Liu

Authors
  1. Yang Zhou  (周炀)
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  2. Jianfeng Wu  (吴建锋)
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  3. Kezhong Tian
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  4. Xiaohong Xu
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  5. Sitong Ma
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  6. Shaoheng Liu
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Correspondence to Yang Zhou  (周炀) or Jianfeng Wu  (吴建锋).

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Funded by the National Key R&D Program of China (No. 2018YFB1501002)

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Zhou, Y., Wu, J., Tian, K. et al. Effects of Co2O3 Addition on Microstructure and Properties of SiC Composite Ceramics for Solar Absorber and Storage. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 38, 1269–1277 (2023). https://doi.org/10.1007/s11595-023-2819-9

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  • DOI: https://doi.org/10.1007/s11595-023-2819-9

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