Thermal properties measurement of TRISO particle coatings from room temperature to 900 °C using laser-based thermoreflectance methods

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Abstract

The thermal properties of tristructural isotropic (TRISO) particle coatings have been measured using laser-based thermoreflectance methods from room temperature to 900 °C. At room temperature the pyrocarbon coatings have comparable thermal conductivities below 10 W·m−1·K−1, whereas the SiC coating has a thermal conductivity around 90 W·m−1·K−1. The thermal diffusivities of all coatings display significant reduction with increasing temperature. The thermal conductivity of SiC decreases by more than 25% above 800 °C and the thermal conductivities of pyrocarbons increase moderately with the temperature, displaying similar changes to that of amorphous graphite at elevated temperatures.

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Wang, Y., Hua, Z., Schley, R., Beausoleil II, G., & Hurley, D. H. (2022). Thermal properties measurement of TRISO particle coatings from room temperature to 900 °C using laser-based thermoreflectance methods. Journal of Nuclear Materials, 565. https://doi.org/10.1016/j.jnucmat.2022.153721

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