The Study on Oxidation Resistance of SiC Composites Used for Solar Absorber Coating

Abstract:

The SiC composites with good oxidation resistance were fabricated via semi-dry pressing and pressureless firing in the air. The SiC, talc, kaolin, alumina, BN and H₃BO₃ were used as starting materials. Sample B2 fired at 1280 °C had the optimal physical properties with a bending strength of 85.84 MPa. Sample B3 contained 1 wt% H₃BO₃ and fired at 1300 °C for 2 h had the best oxidation resistance. After oxidized at 1000 °C for 50 h, the weight gain and oxidation rate constant of sample B3 were 3.3990 mg/cm² and 0.52×10^-4 g²/(cm⁴·s) respectively. The oxidation products of SiC, BN and H₃BO₃ could generate SiO₂-B₂O₃ film and improve the oxidation resistance effectively. It is believed that these SiC composites should be a promising candidate in solar absorber coating.

• Periodical: Advanced Materials Research (Volumes 887-888)
• Pages: 488-492
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.887-888.488
• Online since: February 2014
• Authors: Xiao Hong Xu*, Zheng Gang Rao, Jian Feng Wu
• Keywords: Oxidation Resistance, Physical Properties, SiC Composites, Solar Absorber Coating

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