High spatial resolution thermal conductivity mapping of SiC/SiC composites [electronic resource]
Herein, 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 co...
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| Format: | Government Document Electronic eBook |
| Language: | English |
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Washington, D.C. : Oak Ridge, Tenn. :
United States. Office of the Assistant Secretary for Nuclear Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2020.
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| Subjects: |
MARC
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| 245 | 0 | 0 | |a High spatial resolution thermal conductivity mapping of SiC/SiC composites |h [electronic resource] |
| 260 | |a Washington, D.C. : |b United States. Office of the Assistant Secretary for Nuclear Energy ; |a Oak Ridge, Tenn. : |b Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy, |c 2020. | ||
| 300 | |a Size: Article No. 152519 : |b digital, PDF file. | ||
| 336 | |a text |b txt |2 rdacontent. | ||
| 337 | |a computer |b c |2 rdamedia. | ||
| 338 | |a online resource |b cr |2 rdacarrier. | ||
| 500 | |a Published through Scitech Connect. | ||
| 500 | |a 09/11/2020. | ||
| 500 | |a "Journal ID: ISSN 0022-3115." | ||
| 500 | |a "Other: PII: S0022311520311272." | ||
| 500 | |a Pek, Ella Kartika ; Brethauer, John ; Cahill, David G. ; | ||
| 500 | |a Univ. of California, Oakland, CA (United States) | ||
| 520 | 3 | |a Herein, 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 æm. 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 ʻC, 90 ʻC, 164 ʻC, and 250 ʻC. The fiber has a uniform and isotropic thermal conductivity of 22 W m<sup>-1</sup> K<sup>-1</sup> at 25 ʻC; 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<sup>-1</sup> K<sup>-1</sup> at 25 ʻC; the thermal conductivity of the matrix scales approximately with the inverse of the square root of temperature, i.e., ? 1/T<sup>1/2</sup>. The thermal conductivity of the interphase at room temperature is 6 W m<sup>-1</sup> K<sup>-1</sup>. The calculated spatially averaged thermal conductivity of this SiC/SiC composite at 1000ʻC is 29 W m<sup>-1</sup> K<sup>-1</sup> | |
| 536 | |b NE0008460. | ||
| 650 | 7 | |a 36 materials science |2 local. | |
| 650 | 7 | |a 11 nuclear fuel cycle and fuel materials |2 local. | |
| 650 | 7 | |a Materials science |2 local. | |
| 650 | 7 | |a Nuclear science & technology |2 local. | |
| 650 | 7 | |a Sicsic composites |2 local. | |
| 650 | 7 | |a Thermal conductivity mapping |2 local. | |
| 650 | 7 | |a Ceramic matrix composites |2 local. | |
| 650 | 7 | |a Alternative fuel cladding |2 local. | |
| 650 | 7 | |a Nuclear fuel cycle and fuel materials |2 local. | |
| 710 | 1 | |a United States. |b Office of the Assistant Secretary for Nuclear Energy. |4 spn. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Idaho Operations Office. |f res. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Office of Scientific and Technical Information |4 dst. | |
| 856 | 4 | 0 | |u https://www.osti.gov/servlets/purl/1848102 |z Full Text (via OSTI) |
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