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- W3085750143 abstract "Silicon carbide (SiC) ceramic matrix composites are being investigated as a new generation of fuel cladding materials due to its higher accident tolerance compared to Zircaloy. Characterization of the thermal conductivity of SiC constituents and their interfaces and interphases in SiC/SiC composites is needed as inputs to models of cladding performance. We used time-domain thermoreflectance (TDTR) to map the thermal conductivity with a spatial resolution of 2 µm. The SiC/SiC composite is comprised of Hi-Nicalon Type S fibers in a matrix made by chemical vapor infiltration (CVI matrix). The interphase material is a pyrolytic carbon/SiC multilayer. We report thermal conductivity maps of the SiC fiber and SiC matrix at temperatures of 25 °C, 90 °C, 164 °C, and 250 °C. The fiber has a uniform and isotropic thermal conductivity of 22 W m−1 K−1 at 25 °C; the thermal conductivity of fiber is approximately independent of temperature. The matrix thermal conductivity is not uniform and varies from 50 to 120 W m−1 K−1 at 25 °C; the thermal conductivity of the matrix scales approximately with the inverse of the square root of temperature, i.e., ∝ 1/T1/2. The thermal conductivity of the interphase at room temperature is 6 W m−1 K−1. The calculated spatially averaged thermal conductivity of this SiC/SiC composite at 1000°C is 29 W m−1 K−1." @default.
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- W3085750143 date "2020-12-01" @default.
- W3085750143 modified "2023-09-25" @default.
- W3085750143 title "High spatial resolution thermal conductivity mapping of SiC/SiC composites" @default.
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- W3085750143 doi "https://doi.org/10.1016/j.jnucmat.2020.152519" @default.
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